Answer:
They donate a proton (H+) ion in water.
28) Which of the following is true about the modern model of the atom?
A) Electrons orbit the nucleus in shells at fixed distances
B) Protons, neutrons, and electrons are located in the nucleus.
C)Atoms are hard, indivisible spheres.
D)A positive nucleus is surrounded by negative electrons.
Answer:
A) Electrons orbit the nucleus in shells at fixed distances
Answer:
the answer is A
Explanation:
According to the atomic model for matter when atoms are heated they move faster. This causes the rate of reaction to change because the atoms
become larger.
have a better chance of colliding with other atoms.
multiply.
stop moving.
B.) have a better chance of colliding with other atoms.
What is the part of the neuron that receives information from other neurons,
muscles, or glands
what will happen if we put iron nails with sodium bicarbonate in a closed flask?
Answer:
You will be able to watch the slow dissolution of the nail (probably a steel nail and not iron) and the change in colour of the solution.
Explanation:
I believe not 100% sure.
Why is it important for some skateboarding ramps to be tall? Use the terms "potential energy" and "kinetic energy" in your answer. plsssssss help meeee Plzzz in kids words
Explanation:
Yw ❤
Shorter people have a lower center of gravity. Taller people have a higher center of gravity. A lot of skateboarding tricks depend on the center of gravity.
What is kinetic energy?
Kinetic energy is a form of energy it possess when any object or person is in motion . It can be defined as the work needed to be done to produce a motion in a object from rest position.
If we want to acceleration in an object then we must apply a force on a object to give motion so we can say that we required to do work for acceleration and then we can say that required is equal to kinetic energy.
Mathematically
Kinetic energy =1/2mv^2
Where
m = mass of object.
v = velocity of object
Kinetic energy is vector quantity it means that it have both i.e magnitude and vector.
S.I unit of Kinetic energy is Joule.
Therefore, Shorter people have a lower center of gravity. Taller people have a higher center of gravity. A lot of skateboarding tricks depend on the center of gravity.
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How many grams of co2 are used when 8.5g of o2 are produced?
This equation shows that n moles of CO₂ are created for every 1 mole of oxygen that is consumed. To convert to grams, we must first compute how many moles of O₂ are produced from 8.5 g of O2, then use that amount to establish how many moles of CO₂ are generated.
How much CO2 is there in a gram of oxygen?One carbon atom contributes 12.01 g/mol to carbon dioxide (CO₂), while the two oxygen atoms together contribute (2)(16.00) = 32.00 g/mol.
How many O2 molecules are there in 8 grams?022 10 23 molecular units 8 grams of oxygen gas have = 8 32 6. 022 10 23 = 1. 5 10 23 molecules in it. Thus, 1 will be the appropriate response to be entered in the blank.
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Which equation is balanced?
O 2Fe +02 → 2Fe2O3
O 3Fe +302 → 3Fe2O3
O 4Fe +302 → 2Fe2O3
O Fe +0₂ Fe₂O3
Answer:
C) 4Fe + 3O2 → 2Fe2O3
Explanation:
For this question, first you would go through all the options and make sure that there is an equal amount of elements on each side.
For the first option: 2Fe +02 → 2Fe2O3
You have only 2Fe atoms and 2O atoms on your reactant side and 4Fe and 6O atoms on your product side. This is not balanced.
For option b: 3Fe +302 → 3Fe2O3
You have 3Fe and 6O atoms on your reactant side while on your product side you have 6Fe and 6O atoms. This is not balanced.
For option c: 4Fe +302 → 2Fe2O3
You have 4Fe and 6O atoms on your reactant side and 4Fe and 6O atoms on your product side. This is balanced!
For option d: Fe +0₂ → Fe₂O3
You have 1Fe and 2O atoms on your reactant side and 2Fe and 3O atoms on your product side. This is not balanced.
***Remember to multiply the subscript of an element by their coefficient (number in front of molecule) if there is any.
draw a diagram to show how you will separate the salt from sugar using the solvent ethanol
Give the name of the ion with 13 protons and 10 electrons
Answer:
Explanation:
aluminum
Answer: The aluminum ion
Explanation:
What is the difference between the R.M.M. and the molar mass of a compound?
Answer:
rmm doesn't need to include unit and molar mass need to include unit
A student conducted three trails to determine the concentration of an unknown concentration of HCI. In the first trail the calculated concentration was 0.104 M, the second was 0.113 M and the third trail was 0.108 M. What is the percent difference between the first two trials and based on the lab procedures procedures guidelines what would the average molarity be?
The percent difference between the first two trials is 8.3% and final outcome would be an average molarity of 0.108 M.
How to calculate percent difference and average molarity?To calculate the percent difference between the first two trials, use the formula:
% Difference = |(Value 1 - Value 2) / ((Value 1 + Value 2) / 2)| x 100%
% Difference = |(0.104 M - 0.113 M) / ((0.104 M + 0.113 M) / 2)| x 100%
% Difference = |-0.009 M / 0.1085 M| x 100%
% Difference = 8.3%
The percent difference between the first two trials is 8.3%.
To find the average molarity, add the three calculated concentrations together and divide by the number of trials:
Average Molarity = (0.104 M + 0.113 M + 0.108 M) / 3
Average Molarity = 0.108 M
Based on the lab procedures guidelines, the average molarity would be the most accurate representation of the unknown concentration of HCI. Therefore, the average molarity of 0.108 M would be the final result.
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Question 2 (10 points)
A hypothetical bird species is purple due to a purple pigment in their feathers. A random mutation in the gene that codes for the purple pigment protein results in one individual white bird.
A
Explain the connection between genes, proteins and traits using this example. Make sure you explain each step. What is the name of the dogma that explains this connection?
Answer:
Genes are segments of DNA that contain instructions for the production of specific proteins. Proteins are the molecules that perform various functions in cells and organisms, such as providing structural support, transporting molecules, and catalyzing chemical reactions.
In the case of the hypothetical bird species, the gene that codes for the purple pigment protein is responsible for producing the purple pigment in the bird's feathers. When a random mutation occurs in this gene, it can affect the production of the pigment protein. In the case of the white bird, the mutation likely results in a non-functional protein that cannot produce the purple pigment, resulting in white feathers.
This process of genes producing proteins, which in turn determine the traits of an organism, is known as the central dogma of molecular biology. The central dogma states that genetic information flows from DNA to RNA to protein, and that the sequence of nucleotides in DNA determines the sequence of amino acids in proteins, which in turn determine the structure and function of the protein and ultimately the traits of the organism.
Explanation:
What seems to be the basic model for how groups are arranged
The concept VSEPR theory is mainly based on the arrangement of electron groups. This theory is generally used to predict the geometry of the molecules.
What is VSEPR theory?The Valence shell electron pair repulsion theory is based on the assumption that valence shell electron pairs repel each other and are oriented in space as far apart as possible to minimize mutual repulsion.
Each group around the central atom is designated as a bonding pair or non-bonding pair. For example BeF₂ is a two electron group in which the number of bond pairs on the central 'Be' atom is two.
Similarly the molecule BCl₃ is a three electron group, the number of electron pairs on the 'Be' atom is 3.
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How to do this
Q1 and Q2
Only want to know how to find molecular formula
Answer:
Question 1
A. Empirical formula is C8H8O3
B. Molecular formula is C8H8O3
Question 2.
A. Empirical formula is CH2
B. Molecular formula is C4H8
Explanation:
Question 1:
A. Determination of the empirical formula:
Carbon (C) = 63.2%
Hydrogen (H) = 5.26%
Oxygen (O) = 31.6%
Divide by their molar mass
C = 63.2/12 = 5.27
H = 5.26/1 = 5.26
O = 31.6/16 = 1.975
Divide by the smallest
C = 5.27/1.975 = 2.7
H = 5.26/1.975 = 2.7
O = 1.975/1.975 = 1
Multiply through by 3 to express in whole number
C = 2.7 x 3 = 8
H = 2.7 x 3 = 8
O = 1 x 3 = 3
Therefore, the empirical formula for the compound is C8H8O3
B. Determination of the molecular formula of the compound.
From Avogadro's hypothesis, 1 mole of any substance contains 6.02×10²³ molecules.
Now from the question given, we were told that 1 molecule of the compound has a mass of 2.53×10¯²² g.
Therefore, 6.02×10²³ molecules will have a mass of = 6.02×10²³ x 2.53×10¯²² = 152.306 g
Therefore, 1 mole of the compound = 152.306 g
The molecular formula of the compound can be obtained as follow:
[C8H8O3]n = 152.306
[(12x8) + (1x8) + (16x3)]n = 152.306
[(96 + 8 + 48 ]n = 152.306
152n = 152.306
Divide both side by 152
n = 152.306/152
n = 1
The molecular formula => [C8H8O3]n
=> [C8H8O3]1
=> C8H8O3
Question 2:
A. Determination of the empirical formula of the compound.
Mass sample of compound = 0.648 g
Carbon (C) = 0.556 g
Mass of Hydrogen (H) = mass sample of compound – mass of carbon
Mass of Hydrogen (H) = 0.648 – 0.556
Mass of Hydrogen (H) = 0.092 g
Thus, the empirical formula can be obtained as follow:
C = 0.556 g
H = 0.092 g
Divide by their molar mass
C = 0.556/12 = 0.046
H = 0.092/1 = 0.092
Divide by the smallest
C = 0.046/0.046 = 1
H = 0.092/0.046 = 2
Therefore, the empirical formula of the compound is CH2.
B. Determination of the molecular formula of the compound.
Mole of compound = 0.5 mole
Mass of compound = 28.5 g
Molar mass of compound =.?
Mole = mass /Molar mass
0.5 = 28.5/ Molar mass
Cross multiply
0.5 x molar mass = 28.5
Divide both side by 0.5
Molar mass = 28.5/0.5 = 57 g/mol
Thus, the molecular formula of compound can be obtained as follow:
[CH2]n = 57
[12 + (1x2)]n = 57
14n = 57
Divide both side by 14
n = 57/14
n = 4
Molecular formula => [CH2]n
=> [CH2]4
=> C4H8.
classify the following compounds as chiral, achiral (but not meso), or meso. 1st structure: _________ 2nd structure: _________ 3rd structure: _________
Answer:
1st structure - Meso
2nd structure - Chiral
3rd structure - achiral
Explanation:
In the 1st structure there is nitrogen atom bonded with 4 different groups. It is Meso compound. In the second structure a carbon atom is attached with hydroxide molecule OH and has four different environment. It is Chiral compound. In the third structure no atom have different atom or group surrounding it. Therefore it is Achiral compound.
Which of the following is a problem caused by dams?
O A. They can be used to generate electricity.
B. They provide water for the irrigation of crops.
.
O C. They impede fish migration and spawning.
O D. They collect and store water for human use.
In one to two sentences, explain how this reaction demonstrates that matter is neither created nor destroyed in a chemical reaction.
Since the number of atoms which are reacting are equal to the number of to the number of atoms in the product, this reaction demonstrates that matter is neither created nor destroyed in a chemical reaction.
What is the principle of matter conservation?Any system that is closed to all exchanges of matter and energy is subject to the law of conservation of matter, which is a general law of physics and chemistry. This law states that regardless of how the components rearrange themselves, the mass of an object or group of things remains constant over time.
A chemical reaction is what?A chemical reaction is a procedure that causes one group of chemical components to change chemically into another. Chemical reactions, which can frequently be described by a chemical equation, traditionally include changes that solely affect the locations of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei.
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What is the pH of a 0.050 M LiOH solution?
Answer:
a. <1.0
b. 1.30
c. 3.00
d. 11.00
e. 12.70
The student claims that the calculated concentration is too high because the filter paper and AgCl(s) precipitate were not fully dry. Do you agree or disagree?
I disagree, the presence of water would decrease rather then increase the concentration of the precipitate.
Would the concentration be too high?We know that the term concentration has to do with the amount of substance that is present in a system. We know that water temds to reduce the concentration of a system. The more the amount water in the system, the less the amount of the substance in the system.
The filter paper is used to weigh the precipitate or the solid product that is obtained in the reaction. We know that the standard practice is that the filter paper ought to be dried and then we can then be able to weigh it and obtain the mass of the substances that was in the solution.
If the filter paper is not fully dry, we would have more amount of water in the system and this would reduce the amount of the AgCl thereby reducing the concentration rather than increase it.
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In Lhasa Tibet the elevation is 12,000 feet. The altimeter reading in an airplane is 19.50 in hg. This pressure is equal to atm
Can someone help me answer this ?
1.3 atm is the pressure at this time.
Altimeters are tools used to gauge an object's height above a fixed level. Altimeters are commonly used in aviation to measure the altitude of an aircraft, and they are also used by mountaineers to measure the altitude of a mountain or peak. Altimeters measure the pressure at a given location, and then use this information to calculate the altitude. The altimeter reading of 19.50 in hg is equal to approximately 1.3 atm (atmospheres). You must solve the following equation to determine this:
1 atm = 29.92 in hg
Therefore, 19.50 in hg = \(\frac{19.50 }{29.92} = 0.65 atm\)
Multiply 0.65 atm by 2 to get the approximate atm reading of 1.3 atm
Therefore ,the pressure is equal to 1.3atm.
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Know about the first model of the atom.
Answer:
The ancient Greeks were the first to use the word atom,which means indivisible,to describe the smallest particle of any substance. Its actual existence was not established until yhe nineteenth century when John Dalton, an English chemist,put forward a theory to describe the nature of the atom.The atom is now considered to be the basic unit of simple substances or elements.An atom is the smallest particle of an element which can take part in a chemical reaction or an atom is the smallest part of an element that can ever exist and still possess the chemical properties of that element.
What is the balanced chemical equation for this reaction? H3PO4 + HCl → PCl5 + H2O Question 7 options: H3PO4 + 5HCl → PCl5 + H2O 2H3PO4 + 10HCl → 2PCl5 + 4H2O 2H3PO4 + 5HCl → 2PCl5 + 3H2O H3PO4 + 5HCl → PCl5 + 4H2O
Answer:
H3PO4 + 5HCl → PCl5 + 4H2O
Explanation:
In a chemical reaction, the number of atoms of each element must be the same on both sides of the equation. Notice that, originally, there's only one atom of chlorine on the left side and five atoms of chlorine on the right. The coefficient of 5 is added to the HCl compound to correct this. However, now there are eight atoms of hydrogen on the left and only two on the right. Adding the coefficient of 4 to the H2O compound balances the hydrogen and also balances oxygen on both sides at the same time.
The balanced chemical equation for the reaction:
H₃PO₄ + 5HCl → PCl₅ + 4H₂O (last option)
How to write balance equation?To write the balance equation for any given reaction, all we need to do is to ensure that the number of atoms in the reacting species and products formed are equal on both sides of the equation.
The balanced chemical equation for the reaction given in the question can be obtained as follow:
H₃PO₄ + HCl → PCl₅ + H₂O
There are 5 atoms of Cl on the right side and 1 atom on the left. It can be balanced by writing 5 before HCl as shown below:
H₃PO₄ + 5HCl → PCl₅ + H₂O
There are a total of 8 atoms of H on the left side and 2 atoms on the right. It can be balanced by writing 4 before H₂O as shown below:
H₃PO₄ + 5HCl → PCl₅ + 4H₂O
Now, we can see that the number of atoms in the reactants and products are equal.
Thus, the balanced equation for the reaction is
H₃PO₄ + 5HCl → PCl₅ + 4H₂O (last option)
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Someone help i need an answer quick
Claim 1: Yes, there probably will be a lunar eclipse of the moon of Kepler-47c during a year.
Claim 2: No, there probably won't be a lunar eclipse of the moon of Kepler-47c during a year.
What are the evidence to support this claim?Kepler-47c is a moon orbiting Kepler-47 AB, a binary star system. This implies that the moon's light varies on a regular basis as it circles the two stars. These changes in light might result in a lunar eclipse.
Lunar eclipses occur when the moon passes through the Earth's shadow. While Kepler-47c circles two stars, it is still subject to Earth's gravitational pull and may pass into its shadow.
Lunar eclipses occur on a regular basis, with two to four eclipses occurring on average per year. Given the frequency of lunar eclipses, Kepler-47c is likely to see at least one lunar eclipse every year.
Evidence to support this claim 2:
Lunar eclipses occur when the moon passes through the Earth's shadow. While Kepler-47c is in the Earth's gravitational field, it is not on the same orbital plane as the Earth.
While Kepler-47c circles two stars, its orbit is not known to be stable. Variations in Kepler-47c's orbit may reduce the likelihood of a lunar eclipse.
While lunar eclipses are common, they are not uniformly distributed throughout the year. The locations and motions of the Earth, moon, and sun govern the timing and frequency of lunar eclipses.
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What is rent? A. The amount you spend on needs each month B. The amount you pay to purchase a house C. The amount you pay to live in a space such as an apartment D. The amount you pay for electricity and water
Which of the following is a savanna? a. Veldts b. Plains c. Steppes d. Llanos
Answer:
d) Llanos
Explanation:
Answer:
D . Llanos
Explanation:
Compound A decomposed to form compound B and c I. A first order reaction at 250c° the rate constants for the reaction is 0.45,what is the half life of compound A ?
The half-life of a reaction is the time it takes for the concentration of a reactant to decrease to half its initial value. In a first-order reaction, the rate of the reaction is directly proportional to the concentration of the reactant. This means that the rate of the reaction depends on the concentration of compound A.
To calculate the half-life of compound A, you can use the equation:
half-life = (ln(2)) / k
where k is the rate constant for the reaction.
Plugging in the values given in the question, we get:
half-life = (ln(2)) / 0.45
This simplifies to:
half-life = 1.44 / 0.45
Which gives us a final result of:
half-life = 3.2 hours
So the half-life of compound A at 250°C is approximately 3.2 hours.
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 Please help me with this Chemistry problem! I’ve been trying to figure it out for hours and it’s driving me mad. I’ll be very grateful :) I made it worth 100 points!
Explanation:
Hope this somewhat helped:
a. The equation for the reaction of weak acid, C6H5CO2H, with water is: C6H5CO2H + H2O <=> C6H5CO2^- + H3O^+. We can assume that all the C6H5CO2H has reacted with water to form C6H5CO2^- and H3O^+.
The pH is defined as -log(H30^+ concentration), where H30^+ is the hydronium ion, a measure of the acidic strength of the solution. At the equivalence point, all the C6H5CO2H has reacted with the NaOH to form C6H5CO2^- and Na^+. The stoichiometry of the reaction can be determined by balanced the reaction using the information given.
C6H5CO2H + NaOH <=> C6H5CO2^- + Na^+
This reaction tells us that one mole of C6H5CO2H will react with one mole of NaOH to form one mole of C6H5CO2^- and one mole of Na^+.
Experiment 4: A chemist mixes aqueous solutions of sodium hydroxide and aluminum chloride in a double-displacement reaction, which forms a white solid precipitate and a clear solution. Write the complete, balanced molecular equation for the reaction. Include physical states.
balanced equation:
The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)
In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.
The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.
The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.
In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.
It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.
Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.
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the chunks of fluid magma fall back to the surface to feed a lava flow, which may have a rough …?
… (type of lava) surface or a smooth …?
The chunks of fluid magma that fall back to the surface to feed a lava flow can give rise to two different types of surfaces: rough and smooth.
A rough lava surface is often associated with a type of lava called 'aa' (pronounced "ah-ah"). Aa lava flows are characterized by a jagged and clumpy texture. This occurs because the chunks of magma, known as clinkers, are fragmented and accumulate on top of the flow. As the flow advances, the clinkers are pushed forward, creating a rough and uneven surface. Aa lava flows tend to be slower-moving and can be hazardous to walk on due to their rough texture.On the other hand, a smooth lava surface is typically associated with a type of lava known as 'pahoehoe' (pronounced "pah-hoy-hoy"). Pahoehoe lava flows are characterized by a smooth, undulating surface with a rope-like or ropy texture. The fluid magma of pahoehoe lava allows it to flow more freely, resulting in a surface that appears molten and smooth. Pahoehoe flows can travel greater distances compared to aa flows and are generally easier to traverse.The type of lava surface, whether rough or smooth, depends on various factors such as the viscosity of the magma, eruption style, and the rate of cooling during the lava flow.
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How many grams are in 3.7 moles of Na2O?
Answer:
mass = moles x molar mass
m= 3.7 x (23x2+16)
m= 3.7x62
m= 229.4g
198.4 grams are there is 3.7 moles of Na₂O.
The number of moles is defined as the ratio between given mass and molar mass.
\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\\)
Given:
Number of moles= 3.7 moles
To find:
Mass=?
Molar mass of Na₂O= 62 g/mol
Thus substituting the values in the given formula
\(\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}= 3.2 \text{moles}*62 \text{g/mol}\\\\\text{Given mass}=198.4 \text{g}\)
Thus, 198.4 grams are there is 3.7 moles of Na₂O.
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