Answers
Answer:
Hydrogen
Explanation:
The atom only has one proton and one electron making it the first element in the periodic table.
Related Questions
When carbon dioxide dissolves in water, it undergoes a multistep equilibrium process, with Koverall = 4.5x10⁻⁷, which is simplified to the following:(d) If the partial pressure of CO₂ in clean air doubles in the next few decades, what will the pH of rainwater become?
Answers
The entire atmosphere has a pressure of one atmosphere. As a result, the pressure at 700 ppm is 700x\(10^{-6}\) atm. So, we can see that doubling CO₂ will result in a 0.15 pH unit decrease in the pH of rain.
What is pH?In chemistry, the pH scale is used to define the acidity or basicity of an aqueous solution. Historically, pH stood for "potential of hydrogen." The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.The hydronium concentration's negative log base 10 is known as pH. The pH is a logarithmic indicator of how many hydrogen ions are present in a solution. Since pH is measured on a log scale, a pH increase of 1 equates to a 10-fold increase in the concentration of hydrogen ions!Learn more about pH here:
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1. The atomic number of an element is 23 and its mass number is 56.
a. How many protons and electrons does an atom of this element have?
b. How many neutrons does this atom have?
Answers
Answer:
23 protons, 23 electrons, 33 neutrons
Explanation:
I don't know why my answer got deleted but no worries, I can answer again. The number of protons and electrons is equal to the atomic number which is 23 and the number of neutrons is 56 - 23 = 33 because atomic mass denotes the number of protons and neutrons.
How many atoms of titanium are there in 0.820 mole of each of the following? 1st attempt Part 1 (1point) ilmenite, FeTiO 3
Ti atoms Part 2 titanium(IV) chloride Ti atoms Part 1 ilmenite, FeTiO 3
Ti atoms Part 2 titanium(IV) chloride Ti atoms
Answers
To determine the number of atoms of titanium in 0.820 mole of each compound, we need to use Avogadro's number, which is 6.022 x 10²³ atoms/mol.
1. Ilmenite, FeTiO3:
In 1 mole of FeTiO3, there is 1 mole of titanium atoms.Therefore, in 0.820 mole of FeTiO3, there are 0.820 moles of titanium atoms.The number of titanium atoms in 0.820 mole of ilmenite is 0.820 x 6.022 x 10²³ atoms.2. Titanium(IV) chloride, TiCl4:
In 1 mole of TiCl4, there is 1 mole of titanium atoms.Therefore, in 0.820 mole of TiCl4, there are 0.820 moles of titanium atoms.The number of titanium atoms in 0.820 mole of titanium(IV) chloride is 0.820 x 6.022 x 10²³ atoms.Thus, the number of titanium atoms in 0.820 mole of ilmenite is 4.917 x 10²³ atoms, and the number of titanium atoms in 0.820 mole of titanium(IV) chloride is 4.917 x 10²³ atoms.
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Osmium has a density of 22.6 g/cm^3. What volume (in cm 3) would be occupied by a 21.8 g sample of osmium?
Answers
The volume occupied by a 21.8 g sample of osmium is approximately \(0.964 cm^3\).
The volume (in \(cm^3\)) occupied by a 21.8 g sample of osmium can be calculated using its density of \(22.6 g/cm^3\).
To find the volume, we can use the formula:
Volume = Mass / Density.
Plugging in the values, we have:
Volume = 21.8 g / \(22.6 g/cm^3\)
Now, dividing 21.8 g by \(22.6 g/cm^3\) gives us the volume in cm^3.
Calculating this, we get:
Volume = \(0.964 cm^3\)
So, a 21.8 g sample of osmium would occupy a volume of approximately \(0.964 cm^3\)
In conclusion, the volume occupied by a 21.8 g sample of osmium is approximately \(0.964 cm^3\)
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a disaccharide is formed when two monosaccharide units react via their oh functional groups. the linkage in a disaccharide is
Answers
When two monosaccharide units react via their hydroxyl (OH) functional groups, a disaccharide is formed. The linkage between the monosaccharide units in a disaccharide is known as a glycosidic linkage.
The glycosidic linkage is a covalent bond that joins the two monosaccharide units together. It is formed through a dehydration or condensation reaction, where the hydroxyl group from one monosaccharide combines with the hydrogen atom from the other monosaccharide, resulting in the formation of a water molecule. The remaining oxygen atom from each monosaccharide forms the glycosidic bond.
The specific type of glycosidic linkage depends on the orientation of the hydroxyl groups involved in the reaction. Common types of glycosidic linkages include alpha and beta linkages. In an alpha linkage, the hydroxyl group involved in the reaction is positioned below the plane of the ring, while in a beta linkage, the hydroxyl group is positioned above the plane of the ring.
The type and position of the glycosidic linkage in a disaccharide determine its properties and functionality. Different disaccharides, such as sucrose, lactose, and maltose, have distinct glycosidic linkages, resulting in their unique structures and functions.
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. A carbocation is all of the following, except
O a positively charged species.
O a reactive intermediate.
O an electrophile.
O a nucleophile.
Answers
A carbocation is all of the following, except a nucleophile.A carbocation is a positively charged species, a reactive intermediate, and an electrophile, but it is not a nucleophile.
Nucleophiles are species that donate electrons to form a new covalent bond, while electrophiles are species that accept electrons to form a new covalent bond. Carbocation have a positive charge and therefore it is an electrophile.A carbocation is a type of organic cation in which a carbon atom has a positive charge. Carbocations are formed by the removal of a leaving group from an organic molecule, such as an alkane, alkyl halide, or alkyne, creating a positively charged carbon atom. Carbocations are typically intermediate species in organic reactions and are highly reactive, as the positive charge on the carbon atom creates a high degree of electron deficiency.
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l cells are a particular type of electrochemical cell that require a constant source of chemical fuels, or reactants, during operation. one of the most common types of fuel cells is the alkaline fuel cell, which uses hydrogen and oxygen as reactants. what species are formed at the anode of the alkaline fuel cell? h2 o2 e− oh− h2o h what species are formed at the cathode of the alkaline fuel cell? h2o e− oh− h2 h o2
Answers
Water molecules are the species that also are created on this end of the cell. The total reaction is referred to as a redox reaction.
Explain what electrochemical means.The research of the correlation of electrical electricity and chemical reactions is the focus of the branch of chemistry known as electrochemistry. Oxidation process are those in which electric currents are either generated or received.
What are some electrochemical examples?The typical 1.5-volt cell, which powers numerous electrical devices like TV remote controls and clocks, is an illustration of an electrochemical cell. Copper ions or pv cells are those that may produce an electric current as a consequence of chemical reactions taking place inside of them.
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If distance, d, is proportional to time, t, and at time t =2.00 seconds, the distance is 6.20 m, find the distance when t = 3.50 s.
Answers
Find 1/4th of 2.00 and add that to 6.2
2 NaN3 ---> 2 Na + 3 N2
1) Given 8.38 moles of N2, how many moles of NaN3 are needed?
a. 3.45 moles NaN3
b. 5.59 moles NaN3
c. 8.06 moles NaN3
d. 11.98 moles NaN3
Answers
How much heat must be transferred to 55 g of ice to change the ice's
temperature from -13°C to -5.0°C? (The specific heat capacity of ice is 2.11
J/g.°C)
Answers
Q= m x c x t
M= 55 g
C=2.11
T=8
What is the purpose of running a mixed melting point? How does it work?
Answers
The purpose of running a mixed melting point is to determine the identity or purity of an unknown substance.
The purpose of running a mixed melting point is to confirm the identity and purity of a solid compound. It works by comparing the melting point of a known pure substance with that of a mixture of the pure substance and the unknown compound.
Step-by-step explanation:
1. Prepare two samples: one of the pure known substance and the other of a mixture of the known substance and the unknown compound.
2. Place each sample in a capillary tube.
3. Insert the capillary tubes into a melting point apparatus, which gradually increases temperature.
4. Observe and record the melting points of both samples.
5. Compare the melting points: if they are identical, the unknown compound is likely the same as the known substance. If the mixed melting point is lower or broader than the known substance's melting point, it indicates the presence of impurities or that the unknown compound is different from the known substance.
In summary, the purpose of a mixed melting point is to verify the identity and purity of a compound, and it works by comparing melting points of a pure substance and a mixture of the pure substance and the unknown compound.
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In the titration of 25.0 mL of 0.1 M CH3COOH with 0.1 M NaOH, how is the pH calculated after 8 mL of titrant is added?
a The pH is 14.
b The pH is calculated using the H-H equation for a buffer solution, using the ratio of the concentrations of the weak base and the weak acid, and the pKaof the acid.
c The pH is 1.
d The pH is calculated by determining the concentration of weak conjugate acid present in the solution, using an ICE table to calculate the proton concentration present after hydrolysis, and taking the negative log of the result.
e The pH is based on the concentration of protons present in the solution, which is equal to the original concentration of the base.
f The pH = pKa of the acid.
g The pH is 7.
h The pH is calculated by determining the concentration of weak conjugate base present in the solution, using an ICE table to calculate the hydroxide ion concentration present after hydrolysis, subtracting pOH from 14, and taking the negative log of the result.
i The pH is calculated by determining the concentration of leftover hydroxide ions in the solution, subtracting pOH from 14, and taking the negative log of the result.
Answers
When 8 mL of titrant is added to the titration of 25.0 mL of 0.1 M CH3COOH with 0.1 M NaOH,the pH is calculated by determining the concentration of weak conjugate base present in the solution, using an ICE table to calculate the hydroxide ion concentration present after hydrolysis, subtracting pOH from 14, and taking the negative log of the result.
What is a titration?
Titration is a technique of quantitative analysis used to determine the concentration of an unknown solution by reacting it with a standard solution of known concentration called a titrant.Titration curve
The plot of the pH of the solution as the volume of titrant added to it is referred to as the titration curve.
The titration curve's endpoints indicate the neutralization point, where the moles of acid and base are equal. The equivalence point is when the amount of acid is equal to the number of moles of base.
A weak acid, CH3COOH, with a concentration of 0.1 M is taken, which will form a buffer solution with NaOH.
When 8 ml of NaOH is added to it, it will neutralize a portion of CH3COOH and produce its conjugate base, CH3COO-. NaOH + CH3COOHCH3COONa+ + H2OL Let's assume that "x" moles of CH3COOH have been neutralized by NaOH. So, the remaining moles of CH3COOH will be "0.1-x."
The moles of CH3COO- formed in the reaction are equal to "x" because they are formed by the neutralization of "x" moles of CH3COOH. So, the molecular weight of CH3COO- = x/1000 (1 mL = 1 cm3).
The initial number of moles of CH3COOH in the solution = 0.1 x 25/1000 = 0.0025 mol
We can obtain the pH of the solution by first calculating the number of moles of CH3COOH that have been converted to CH3COO and then using the weak acid dissociation constant (Ka) to calculate the pH of the resulting buffer solution.
Then, we can determine the hydroxide ion concentration using the relation: [OH-] = Kb/[CH3COO-] and calculate pOH by taking the negative logarithm of the OH- concentration.
Finally, we can subtract pOH from 14 to obtain the pH of the buffer solution.
pH = 14 - pOH Please note that the pOH of a buffer solution can be calculated using the Henderson-Hasselbalch equation.
The correct option is h.
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A student knew that it was to make copper (ii) sulphate crystals by adding copper (ii) carbonate to dilute sulphuric acid and warming the resulting solution to drive off some of the water and then leaving the solution to crystallize. he decided to make copper (ii) nitrate crystals by similar method. the only change he made was to use dilute nitric acid. he left the final solution for several days but failed to collect any crystals. explain why the student did not get any crystals to collect
Answers
The student did not get any crystals to collect because copper (II) nitrate is a soluble salt, meaning it readily dissolves in water. Unlike copper (II) sulphate, which is insoluble and can crystallize out of solution, copper (II) nitrate remains in solution even after evaporation of the water.
When the student added copper (II) carbonate to dilute nitric acid, a reaction occurred to produce copper (II) nitrate and carbon dioxide gas. However, since copper (II) nitrate is soluble, it remained dissolved in the solution. The student then warmed the solution to drive off some water, but this step did not cause the copper (II) nitrate to crystallize because it remains soluble in the remaining water.
Leaving the solution to crystallize for several days did not result in the formation of copper (II) nitrate crystals because there was no solid salt to crystallize out. The water gradually evaporated, but the dissolved copper (II) nitrate simply became more concentrated in the remaining solution.
To obtain copper (II) nitrate crystals, the student would need to use a different method. One possible approach is to use a more concentrated nitric acid solution or to try different solvents that can selectively precipitate the copper (II) nitrate from the solution. It's important to note that working with chemicals and performing experiments should always be done with proper safety precautions and under the supervision of a qualified individual.
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1. The electronic configuration of chlorine is
1. 2,7
II. 2,8,8,7
III. 2,8,7
IV. 2,7,8
Answers
Answer:
Chlorine has atomic number 17. Its electronic configuration is 2, 8, 7. It is the second-lightest of the halogens, it appears between fluorine and bromine in the periodic table.
Answer:
III
Explanation:
From the periodic table, Chlorine(Cl) has 17 protons.
And when arranging the proton of elements each shell has a number protons it can take, i.e
2,8,8,8..........
The first shell can only take a maximum of 2 protons while the second shell upwards takes a maximum of 8 protons
Now we want to arrange Chlorine;
1st shell = 2
2nd shell = 8
2 + 8 = 10
17(no. of Chlorine protons) - 10
= 7
therefore,
3rd shell = 7
Therefore,
The electronic configuration of chlorine is
2,8,7
which compound is not a necessary coenzyme for the function of the pyruvate dehydrogenase complex?
Answers
NADPH is not a necessary coenzyme for the function of the pyruvate dehydrogenase complex.
The compound that is not a necessary coenzyme for the function of the pyruvate dehydrogenase complex is NADPH (nicotinamide adenine dinucleotide phosphate).
The pyruvate dehydrogenase complex is responsible for the conversion of pyruvate, a product of glycolysis, into acetyl-CoA, which enters the citric acid cycle. This complex requires several coenzymes for its proper function, including thiamine pyrophosphate (TPP), lipoic acid, coenzyme A (CoA), and FAD (flavin adenine dinucleotide).
NADPH, on the other hand, is not directly involved in the function of the pyruvate dehydrogenase complex. It primarily acts as a reducing agent in various metabolic reactions, such as fatty acid synthesis and detoxification processes.
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En la electrosis del cloruro de sodio (Na Ci) el cloruro es atraido por elcatodo. Falso o verdadero. Y porque?
Answers
Answer:
Falso
Explanation:
La electrólisis es la descomposición de una solución cuando la corriente continua se pasa a través de ella.
La corriente entra y abandona el electrolito a través de los electrodos. El electrodo positivo se llama el ánodo mientras el electrodo negativo se llama cátodo.
Los iones positivos se mueven hacia el cátodo, mientras que los iones negativos se mueven hacia el ánodo.
Dado que el cloruro es un ion negativo, se mueve hacia el ánodo y no hacia el cátodo.
what is the mass of 29.3 L of carbon monoxide at STP?
hey guys.. show. work.. i have no idea whats going on
Answers
Answer:
33.67g
Explanation:
To calculate the mass of carbon monoxide, we can use the ideal gas law, which relates the pressure, volume, number of moles, and temperature of a gas:
PV = nRT
Where:
P = pressure
V = volume
n = number of moles
R = ideal gas constant
T = temperature
At STP (standard temperature and pressure), the pressure is 1 atm and the temperature is 273.15 K. The ideal gas constant is R = 0.08206 L atm/(mol K).
To find the number of moles of carbon monoxide in 29.3 L at STP, we can rearrange the ideal gas law to solve for n:
n = PV/(RT)
n = (1 atm)(29.3 L)/(0.08206 L atm/(mol K) * 273.15 K)
n = 1.203 mol
The molar mass of carbon monoxide (CO) is 28.01 g/mol. Therefore, the mass of 1.203 mol of CO is:
mass = n * molar mass
mass = 1.203 mol * 28.01 g/mol
mass = 33.67 g
Therefore, the mass of 29.3 L of carbon monoxide at STP is approximately 33.67 grams.
the normal boiling point of mercury (hg) is 356.7 °c. what is the vapor pressure of mercury at 340.5 °c in atm? (∆hvap = 58.51 kj/mol)
Answers
The vapour pressure of mercury at 340.5°C in atm is 1.06 x 10^(-13) atm
The normal boiling point of mercury is 356.7 °C.
Given that, the ∆Hvap of mercury = 58.51 kJ/mol
We know that at boiling point, the vapour pressure of the substance is 1 atm and with the increase in temperature, the vapour pressure of the substance also increases. We can use Clausius-Clapeyron Equation to calculate the vapour pressure of mercury at 340.5°C.
Clausius-Clapeyron equation is given by :
log(P2/P1) = - ∆Hvap/R [1/T2 - 1/T1]
Where, P1 = vapour pressure at boiling point of mercury = 1 atm
T1 = boiling point of mercury = 356.7 °C = 629.85 K
T2 = 340.5 °C = 613.65 K
∆Hvap = 58.51 kJ/mol
R = gas constant = 0.0821 L atm/mol K
On substituting the values,
log(P2/1) = - 58510/(0.0821 ) x [1/613.65 - 1/629.85]
log(P2) = 29.87
(P2) =1.06 x 10^(-13) atm
Thus, the vapour pressure of mercury at 340.5 °C is 1.06 x 10^(-13) atm(approx).
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Why is it difficult to see whether you have added the phenolphthalein to the flask solution before you have titrated it?
Answers
Whether in an alkali (pink) or an acid (colorless) solution, the phenolphthalein indicator has one of two distinct structures. Both structures are light-absorbing in the ultraviolet spectrum, which the human eye cannot see. So it is challenging.
What is phenolphthalein? The phthalein family of chemical compounds includes the indicator phenolphthalein (C20H14O4). The powder is a thin, crystalline yellowish-white to light orange powder. It has a pKa of 9.3, is barely soluble in water, and, when dissolved in alcohol, is used as an indicator for acid-base titration investigations.It is colorless in liquid form until pH 8.5 when it transforms from pink to dark red. Adolf von Baeyer, a German chemist, created phenolphthalein in 1871. He produced it by fusing phenol and phthalic anhydride in the presence of sulfuric acid (H2SO4) or zinc chloride. Phenolphthalein is closely linked to the triphenylmethane dyes (ZnCl2). The abbreviation "HIn" or "php" in shorthand notation is frequently used to refer to the chemical compound phenolphthalein, which has the formula C20H14O4. Its structure consists of 2 alcoholic groups, one ketone group, three hexagonal structures, and one pentagonal structure. Another compound with carbon, hydrogen, and oxygen chain structure is phenolphthalein.Phenolphthalein is frequently used as an indicator in acid-base titrations. Due to its water solubility, phenolphthalein is frequently dissolved in alcohols before use in experiments. It is a weak acid that can lose H+ ions in solutions. While the ion of phenolphthalein is purple, the phenolphthalein molecule is colorless.A common indicator used in titration experiments to show the titration's endpoint is phenolphthalein, an inert, colorless acid. Since this molecule dissociates to generate pink anions when dissolved in water, the endpoint is signaled by the production of pink color.To learn more about phenolphthalein, refer to:
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Based on how they obtain their food, fungi are _____. A plant-like B animal-like
Answers
Answer:
whats is it?
Explanation:
Answer: A. Plant Like
Explanation:
They can obtain energy from photosynthesis through the sun.
Electronic configuration of first 20 elements
Answers
Explanation:
Electronic Configuration of First 30 Elements with Atomic Numbers
Atomic Number Name of the Element Electronic Configuration
18 Argon (Ar) [Ne] 3s2 3p6
19 Potassium (K) [Ar] 4s1
20 Calcium (Ca) [Ar] 4s2
21 Scandium (Sc) [Ar] 3d1 4s2
26 more rows
Explanation:
NUMBER ELEMENT ELECTRON CONFIGURATION
1 Hydrogen 1s1
2 Helium 1s2
3 Lithium [He]2s1
4 Beryllium [He]2s2
5 Boron [He]2s22p1
6 Carbon [He]2s22p2
7 Nitrogen [He]2s22p3
8 Oxygen [He]2s22p4
9 Fluorine [He]2s22p5
10 Neon [He]2s22p6
11 Sodium [Ne]3s1
12 Magnesium [Ne]3s2
13 Aluminum [Ne]3s23p1
14 Silicon [Ne]3s23p2
15 Phosphorus [Ne]3s23p3
16 Sulfur [Ne]3s23p4
17 Chlorine [Ne]3s23p5
18 Argon [Ne]3s23p6
19 Potassium [Ar]4s1
20 Calcium [Ar]4s2
Identify the type of energy conversion represented by each picture.
solar energy to light energy
electric energy to light energy
electric energy to heat energy
wind energy to electric energy
Answers
The type of energy conversion represented by each picture is as follows:
1- Electric energy to Heat energy
2-Wind energy to electric energy
3-Solar energy to light energy
4-Electric energy to light energy
1. Solar energy to light energy: Solar energy, which is the radiant energy emitted by the Sun, is absorbed by photovoltaic cells or solar panels. These devices convert the solar energy into electrical energy, which is then used to produce light energy, such as in solar-powered lights or solar-powered electronic displays.
2. Electric energy to light energy: This type of energy conversion is commonly seen in various lighting devices. When electric current flows through a light bulb or LED (Light-Emitting Diode), the electrical energy is converted into light energy.
3. Electric energy to heat energy: Electrical energy can be converted into heat energy through resistive heating elements. When an electric current passes through a resistive material, such as a heating coil or a heating element in a toaster, the resistance of the material causes it to heat up and dissipate the electrical energy as heat.
4. Wind energy to electric energy: Wind turbines harness the kinetic energy of the wind and convert it into mechanical energy by spinning the turbine's rotor. The rotational motion is then transferred to a generator, which converts the mechanical energy into electrical energy.
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the complete question is:
Identify the type of energy conversion represented by each picture.
solar energy to light energy
electric energy to light energy
electric energy to heat energy
wind energy to electric energy
What is a common disease caused by a fungus?
A.
common cold
B.
HIV/AIDs
C.
athlete's foot
D.
pneumonia
Answers
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The Correct choice is : C
Athlete's foot is one of the common disease caused by a fungus !
Water boils at 90∘Cwhen the pressure exerted on the liquid equals (1) 65 kPa (2) 90 kPa (3) 101.3 kPa (4) 120 kPa
Answers
The boiling point of water is dependent on the pressure exerted on the liquid. In this case, water boils at 90°C when the pressure exerted on the liquid equals 101.3 kPa, which is equivalent to atmospheric pressure. At different pressures, the boiling point of water will vary.
The boiling point of a substance is the temperature at which its vapor pressure equals the external pressure exerted on the liquid. When the external pressure is equal to the vapor pressure, the liquid starts to vaporize and boil.
In the given options, the pressure values are provided, and we need to determine which pressure corresponds to the boiling point of water at 90°C.
At standard atmospheric conditions, the pressure is approximately 101.3 kPa, which is equivalent to 1 atmosphere (atm) or 760 mmHg. This is also known as the normal boiling point of water, where water boils at 100°C.
Based on this information, we can conclude that option (3) 101.3 kPa is the correct choice. At this pressure, water boils at 90°C.
Therefore, the boiling point of water is affected by the pressure exerted on the liquid, and at 101.3 kPa, water boils at 90°C. At higher pressures, such as option (4) 120 kPa, water would boil at a higher temperature, and at lower pressures, such as options (1) 65 kPa or (2) 90 kPa, water would boil at a lower temperature.
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fill in the blanks with the coefficients for the balanced version of the following equation: sno2 h2→sn h2o
Answers
The balanced equation is SnO₂ + 5/2 H₂ → Sn + 3/2 H₂O.
To balance the equation: SnO₂ + H₂ → Sn + H₂O, we need to ensure that the number of atoms on both sides of the equation is equal.
Start by balancing the atoms of elements that appear in only one compound on each side. In this case, we have tin (Sn) and oxygen (O). We have one Sn on the right side, so we need to balance it with a coefficient of 1 on the left side.
Next, balance the oxygen atoms. We have two O atoms in SnO₂ and one O atom in H₂O, giving us a total of three O atoms on the left side. To balance this, we place a coefficient of 3/2 in front of H₂O, resulting in 3/2 H₂O.
Now, balance the hydrogen (H) atoms. We have four H atoms in H₂ and one H atom in 3/2 H₂O, giving us a total of 5/2 H atoms on the left side. To balance this, we place a coefficient of 5/2 in front of H₂, resulting in 5/2 H₂.
The balanced equation is: SnO₂ + 5/2 H₂ → Sn + 3/2 H₂O.
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the following questions are related to the titration experiment described above Question 12. (a) The number of moles of NH, molecules present in 60.0 mL of 0.10 M NH3(aq) is (b) The number of moles of Hions present in 30.0 mL of 0.10 M HCl(aq) is (c) Write the net-fonic equation for the reaction between NH3(aq) and HCl(aq). Eliminate any spectator ions. the (d) At the halfway point in this titration, the concentration of NH, is concentration of NH.. As a result of this situation, the concentration of OH-is equal to the of the weak base. This means that the pOH of the solution at the halfway point in the titration is equal to the of the weak base. C) In this titration experiment, after 30.0 mL of the titrant, 0.10 M HCI, has been added, the pH of the solution is equal to 9.26. Use this information to calculate the value of Ks for NHs. Express your answer in proper scientific notation, and round your answer to 2 significant figures.
Answers
At the equivalence point, we have only NH₄⁺. After the equivalence point, we have a mixture of NH₄⁺ and Cl⁻. The value of Ks for NH₃ can be calculated to be 1.26 x 10⁻⁵ mol/L.
a) To find the number of moles, we need to use the following formula:
number of moles = concentration × volume
where concentration is in units of moles per liter (M), and volume is in units of liters (L).
The number of moles of NH₃ molecules present in 60.0 mL of 0.10 M NH₃(aq) is
6.00 x 10⁻³ mol NH₃.
(b) The number of moles of H⁺ ions present in 30.0 mL of 0.10 M HCl(aq) is 3.00 x 10⁻³ mol H⁺.
(c) The net-ionic equation for the reaction between NH₃(aq) and HCl(aq) is NH₃(aq) + H⁺(aq) → NH₄⁺(aq).
(d) At the halfway point in this titration, the concentration of NH₃ is equal to the concentration of the weak base.
This means that the pOH of the solution at the halfway point in the titration is equal to the pKb of the weak base.
(c) In this titration experiment, after 30.0 mL of the titrant, 0.10 M HCI, has been added, the pH of the solution is equal to 9.26.
Using this information, the value of Ks for NH₃ can be calculated to be 1.26 x 10⁻⁵ mol/L.
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Which orbital is portrayed on the right?
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A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.
What's the appearance of the p orbital?A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.Each shell can only carry a certain amount of electrons: the first shell can hold two electrons, the second shell can hold eight electrons (2 + 6) and so on, the third shell can hold 18 electrons (2 + 6 + 10).To learn more about orbital refer to:
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how many moles of iron are present in 3.15 × 10^24 atoms of iron?
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Answer:
5.23 moles
Explanation:
How many moles of iron are present in 3.15 × 10^24 atoms of iron?
1 mole has 6.02 X 10^23 particles
so
3.15X10^ 24 atoms =( 3.15 X 10^24)/(6.02 X 10^23) =(3.15/6.02 )X 10 =
5.23 moles
which structural feature most liekly accounts for the signals aroudn 7 ppm in the given 1h nmr spectrum
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The signals around 7 ppm in a 1H NMR spectrum are likely due to the presence of aromatic protons.
Aromatic protons are those protons that are attached to an aromatic ring structure, such as a benzene ring. These protons have a very distinct chemical shift of around 7 ppm and will show up as a multiplet in the spectrum.
The aromatic protons also have an increased coupling effect, resulting in the signal appearing as a multiplet rather than a single peak. Additionally, the coupling effect between the aromatic protons can cause them to appear as a triplet, quartet, sextet, or other pattern, depending on the number of aromatic protons in the molecule.
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FILL THE BLANK.Testosterone is an example of a chemical signal that affects the very cells that synthesize it in the testes, neighboring cells, and distant cells outside the gonads. Testosterone is an example of ________.
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Testosterone is an example of an autocrine signaling molecule. Autocrine signaling refers to a mode of cell communication where a signaling molecule acts on the same cell or cell type that produced it. In the case of testosterone, it is synthesized by the Leydig cells in the testes and can exert effects on these same cells, regulating their own function.
Additionally, testosterone can also act on neighboring cells in a paracrine manner, influencing their activity and functions. For example, testosterone can affect Sertoli cells in the testes, supporting sperm development.
Furthermore, testosterone can travel through the bloodstream and affect distant cells outside the gonads, acting as an endocrine signaling molecule. It can impact various tissues and organs throughout the body, influencing secondary sexual characteristics, muscle growth, bone density, and other physiological processes.
In summary, testosterone demonstrates autocrine, paracrine, and endocrine signaling actions, allowing it to exert diverse effects on cells within the testes, neighboring cells, and distant cells outside the gonads.
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