Answers
Answer:
C. 5 grams
Explanation:
The ratio is 2:1, which means everything on the right (B) will be half of the left (A). Since 10 is on the left, and half of 10 is 5, C is the answer
Related Questions
Which of the following elements are noble gases? Select all that apply.IronKryptonNeonArgon
Answers
1) Noble gases. Elements in the periodic table are organized in groups. We can find the noble gases in the eighteenth group (column).
2) Zoom in to the right part of the periodic table.
We can see in this image that Krypton (Kr), Neon, and Argon ARE noble gases.
Iron is NOT a noble gas.
.
What is the most plentiful fossil fuel? A: oil B:Natural has C: petroleum D: coal
Answers
Answer:
Explanation:
d:coal!
hope i helped :)))
For the following questions, use the reaction N02(0) -> JN2(9) + 02(9), with AH = -33.1 kJ/mol
and AS = 0.06302 kJ/(mol K).
Draw a possible potential energy diagram of the reaction. Label the enthalpy of the reaction.
Answers
The potential energy diagram for the reaction N02(0) -> JN2(9) + 02(9) should be a curve that descends from reactants to intermediates and then ascends to products, with a label indicating that ΔH = -33.1 kJ/mol.
A potential energy diagram of a reaction is a graph that demonstrates the progress of a reaction and the changes in potential energy that occur over time. The vertical axis of the diagram shows potential energy, and the horizontal axis shows reaction progress. Reactants are shown on the left, intermediates are shown in the middle, and products are shown on the right. The reaction pathway is depicted with a curve that descends from reactants to intermediates and then ascends to products. Labeling the enthalpy of a reaction involves identifying its enthalpy change. The enthalpy change (ΔH) of a reaction is the heat absorbed or given off by the system at a constant pressure. The reaction N02(0) -> JN2(9) + 02(9) has ΔH = -33.1 kJ/mol. The reaction is exothermic because the enthalpy change is negative.
The potential energy diagram for this reaction should be a curve that descends from reactants to intermediates and then ascends to products. The enthalpy change should be labelled in the diagram. If the enthalpy change is negative, then it should be labelled as a negative value. If the enthalpy change is positive, then it should be labelled as a positive value.
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How are chemical reactions used in art
Answers
Answer:
Chemistry reactions are used in art for the following processes;
1) Analog photography
The photographic paper used in analog photography react when exposed to light such that the image on the film stains the photopaper
A series of chemicals are further used to develop the images now carried on the paper and water is used to rinse of the chemicals after the other chemical processes are complete
The photopaper, now bearing the developed photo is hung for it to be dried
2) Paint used for painting consists of several chemicals, including, minerals that serve as pigment, oils that serve as carrying agent, a thinner to prevent the paint from turning to solid
An artist therefore combines different chemicals for a given paint task
3) In the sculpting process
An original sculpture is produced by the artist with the aid of clay or plaster, from the original sculpture, on which wax coatings and chemicals are used to make a replica mold.
Copies of the sculpture can then be made by pouring material into the mold
Explanation:
What is the work required for the separation of air (21-mol-% oxygen and 79-mol-% nitrogen) at 25°C and 1 bar in a steady-flow process into product streams of pure oxygen and nitrogen, also at 25°C and 1 bar, of the thermodynamic efficiency of the process is 5% and if Tσ = 300 K
Answers
Work = 116.1 kJ/mol.
Explanation:
Separating air into pure oxygen and nitrogen requires the removal of one component (nitrogen) from the mixture while leaving the other component (oxygen) behind. This can be accomplished using a cryogenic distillation process, which takes advantage of the different boiling points of the two components.
The thermodynamic efficiency of the process is given as 5%, which means that only 5% of the work input is converted to useful work (i.e., the separation of the components). The remaining 95% is dissipated as waste heat.
The work required for the separation of air can be calculated using the following equation:
W = ΔG / η
where W is the work required, ΔG is the Gibbs free energy change for the separation process, and η is the thermodynamic efficiency.
The Gibbs free energy change for the separation of air into pure oxygen and nitrogen can be calculated using the following equation:
ΔG = RTln(K)
where R is the gas constant, T is the temperature (in kelvin), and K is the equilibrium constant for the reaction. For the separation of air, the equilibrium constant is equal to the ratio of the vapor pressures of nitrogen and oxygen at the given temperature and pressure:
K = P_N2 / P_O2
At 25°C and 1 bar, the vapor pressures of nitrogen and oxygen are:
P_N2 = 0.79 × 1 bar = 0.79 bar
P_O2 = 0.21 × 1 bar = 0.21 bar
Therefore, the equilibrium constant is:
K = 0.79 / 0.21 = 3.76
Substituting this into the equation for ΔG gives:
ΔG = RTln(K) = (8.314 J/mol-K)(298 K)ln(3.76) = -5806 J/mol
The negative sign indicates that the separation process is thermodynamically favorable (i.e., exergonic).
Substituting ΔG and η into the equation for W gives:
W = ΔG / η = (-5806 J/mol) / 0.05 = -116,120 J/mol
The negative sign indicates that work must be done on the system to effect the separation of air. The work required is 116,120 J/mol, or 116.1 kJ/mol.
The value of Tσ = 300 K is not used in this calculation, as it represents the reference temperature for calculating the thermodynamic efficiency.
The value of 300K (or more precisely, Tσ = 298.15 K) is used as the reference temperature for calculating thermodynamic efficiency in some cases, particularly for thermodynamic cycles. However, in the problem given, we are not dealing with a thermodynamic cycle but rather a steady-flow process for the separation of air into its component gases. In this case, the temperature and pressure of the air and product streams are all specified (25°C and 1 bar), and the calculation of the work required for the separation is based on the Gibbs free energy change of the process, which depends on the actual temperature and pressure conditions. Therefore, the value of 300K (or Tσ) is not used in this calculation.
9. Mr. James owns 12 gas stations in Newport News. He wants to build a
new gas station on the same block that already has a gas station. There
are 3 other different gas stations near by. He thinks it will allow the
community to have a choice as to which gas to use. What type of
viewpoint does Mr. James have?
O preservationist viewpoint
conservationist viewpoint
developmental viewpoint
Answers
Answer:
Option C, developmental view point
Explanation:
A person with preservationist viewpoint will think of only preserving the natural resources and the environment. While a person with a conservationist viewpoint will think of conserving the landscape, architecture, heritage, culture, buildings, rituals, etc.
However, a person with developmental viewpoint will think of developing resources at ease. He/She will prioritize development and comfort of customer above all.
Hence, option C is correct
help me get this right no links
Answers
Answer:
1 and 2
Explanation:
1. The moon blocks the sun's light from hitting the Earth. (It casts a shadow on the earth by doing so)
2. The moon moves between the Earth and the Sun. (So it blocks the sun's light)
1) How are hydrogens removed from polyprotic acids? a. How does this relate to the Ka of these same species? b. What is the relationship between Ka and Kbvalues? (How can you determine Ka knowing Kb?)
Answers
Hydrogens are removed from polyprotic acids through a stepwise dissociation process. Each hydrogen ion (H+) removed one at a time, resulting in formation of successive conjugate bases.
Strength of acid decreases with each removal of a hydrogen ion. The Ka (acid dissociation constant) of a polyprotic acid represents the equilibrium constant for the dissociation of the first hydrogen ion. The Ka value is related to the acidity of the acid. As the Ka value increases, the acid is stronger and more likely to donate its hydrogen ion. In the case of polyprotic acids, the Ka value decreases with each successive dissociation of a hydrogen ion. This is because the dissociation of subsequent hydrogen ions becomes progressively more difficult as the acid loses its positive charge and the electron density on the remaining oxygen atoms decreases.
The Kb (base dissociation constant) values are related to the Kb values of the conjugate bases of the polyprotic acids. The relationship between Ka and Kb is defined by the equation Ka x Kb = Kw, where Kw is the ion product of water. Knowing the Kb value of the conjugate base, one can determine the Ka value of the corresponding acid by using this equation. The relationship between Ka and Kb values reflects the principle of equilibrium. In an acid-base reaction, the equilibrium constant for the forward reaction (Ka) is inversely proportional to the equilibrium constant for the reverse reaction (Kb). Therefore, if the Kb value of a conjugate base is known, one can calculate the Ka value of the acid by using the equation Ka = Kw / Kb.
Overall, the relationship between Ka, Kb, and the stepwise dissociation of polyprotic acids provides insights into the acidity of the acid, the strength of its conjugate base, and the equilibrium between the acid and its conjugate base.
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Question 4 of 10
Based on the trend in valence electrons across periods for main-group
elements, how many valence electrons does fluorine (F) have?
A. 5
O
B. 7
C. 4
D. 6
Answers
Answer:
The answer is 7
Explanation:
Guessed it
what are some of the uses of halogens?
Answers
Answer:
Halogens are used in, water and sanitation, plastics, pharmaceutical, pulp and paper, textile, military and oil industries. Bromine, chlorine, fluorine and iodine are chemical intermediates( bleaching agents and disinfectants). Chlorine is used to purify water. Chlorine also is part of salt, sodium chloride, which is one of the most widely used chemical compounds. Fluorine is used in fluorides, which are added to water supplies to prevent tooth decay.
hopes this helps~
Answer:
What are some uses of halogen elements? Chlorine is used to purify water. Chlorine also is part of salt, sodium chloride, which is one of the most widely used chemical compounds. Fluorine is used in fluorides, which are added to water supplies to prevent tooth decay.
Explanation:
Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts). They were given the name halogen, from the Greek roots hal- (“salt”) and -gen (“to produce”), because they all produce sodium salts of similar properties, of which sodium chloride—table salt, or halite—is best known.
Because of their great reactivity, the free halogen elements are not found in nature. In combined form, fluorine is the most abundant of the halogens in Earth’s crust. The percentages of the halogens in the igneous rocks of Earth’s crust are 0.06 fluorine, 0.031 chlorine, 0.00016 bromine, and 0.00003 iodine. Astatine and tennessine do not occur in nature, because they consist of only short-lived radioactive isotopes.
Mercury(ii) oxide (hgo) decomposes to form mercury (hg) and oxygen (o2). the balanced chemical equation is shown below. 2hgo right arrow. 2hg o2 the molar mass of o2 is 32.00 g/mol. how many moles of hgo are needed to produce 250.0 g of o2? 3.906 moles 7.813 moles 15.63 moles 73.87 moles
Answers
Decomposition reaction results in the formation of the products by splitting the reactants. Moles of mercury(ii) oxide needed are 15.63 moles.
What are moles?Moles are the ratio of mass and the molar mass of the compound or the molecule.
Moles of oxygen are calculated as:
\(\begin{aligned}\rm n &= \rm \dfrac {mass}{molar\; mass}\\\\&= \dfrac{250}{32}\\\\&= 7.8125 \;\rm moles\end{aligned}\)
The balanced chemical reaction can be shown as,
\(\rm 2HgO \rightarrow 2Hg + O_{2}\)
From the reaction, it can be said that 1 mole of oxygen requires 2 moles of mercury oxide.
Moles of mercury oxide are calculated as:
\(\begin{aligned} \rm n HgO& = (7.8125 \;\rm moles \; O_{2}) \times (\dfrac{2 \;\rm moles\; HgO}{1 \;\rm mole \; O_{2}})\\\\\rm n HgO &= 15.625 \;\rm moles \end{aligned}\)
Therefore, option C. 15.63 moles of mercury (II) oxide is needed.
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determine delta h vap for a compound that has a measured vapor pressure of 24.3 torr at 273k and 135 torr at 325k
Answers
Enthalpy of vaporization for the compound will be close to 24.3 kJ/mol. The enthalpy of vaporization is also known as the (latent) heat of vaporization or heat of evaporation.
What is enthalpy in heat?If the change in enthalpy is positive, the reaction is endothermic in nature. A lower enthalpy indicates a process using less energy. Enthalpy (ΔH) is a measure of the overall heat content of the system.It is a state function that is conveniently supplied by the sizable ambient environment and is used in numerous measurements in chemical, biological, and physical systems at a constant pressure.Using the Clausius-Clapeyron equation, you can calculate the enthalpy of vaporisation, H vap. This equation can be expressed in a number of equivalent ways,In (p2/p1) = ΔH vap / R × ( 1 / T1 - 1 /T1 )
P1, P2 - the vapor pressure at 273 K and 325 K, respectively
ΔHvap - the enthalpy of vaporization;
T1, T2 - the two temperatures given to you.
ΔH vap = In (p2/p1) × R / ( 1/ T1 - 1 /T2 )
ΔH vap = ( In (135 torr / 24.3 torr) × 8.314 J / mol × k ) / (1/273 - 1/325 ) K^ -1
ΔH vap = ( 1.7148 × 8.314 J/mol ) / 0.0005861 = 24324.9 J/mol
ΔH vap ≈ 24.3 kJ/mol
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The element copper has 29 protons. What is the atomic number of copper?
Answers
Hope this helps and if it does, don't be afraid to rate my answer as well as maybe give it a "Thanks"? (Or even better a "Brainliest"). And if it’s not correct, I am sorry for wasting your time, and good luck finding the correct answer :)
Answer:
29
Explanation:
since protons are a constant and unique characteristic of an element it's considered as he atomic number of that element.
Factors identified as associated with (and possibly causing) type 1 diabetes mellitus include all of the following EXCEPT;
a) autoimmune reaction
b) absolute deficiency of insulin
c) dysfunctional insulin receptors
d) genetic factors
Answers
The factor identified as not associated with (and possibly causing) type 1 diabetes mellitus is option c) dysfunctional insulin receptors.
Insulin-producing cells in the pancreas are destroyed in type 1 diabetes mellitus, an autoimmune condition. Type 1 diabetes mellitus is thought to be caused by or be influenced by the following factors:
Autoimmune response: An inadequate supply of insulin results from the immune system wrongly attacking and destroying the pancreatic beta cells that produce insulin.Total lack of insulin: When beta cells are destroyed, the body experiences a total lack of insulin because the generation of insulin is either drastically decreased or stopped.Genetic factors: Type 1 diabetes has a strong hereditary component, and some genetic variants can raise the likelihood of acquiring the disease.A hormone called insulin is produced by beta cells in the pancreas. It is essential for controlling blood sugar levels and making it easier for cells to absorb glucose for use as fuel. Insulin signals cells in the liver, muscle, and fat tissues to absorb glucose from the bloodstream, assisting in the maintenance of normal blood sugar levels.
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what is an atom and expailn
Answers
Hope you could understand.
If you have any query, feel free to ask.
40K decays to 40Ar with a half-life of 1.3 billion years. Argon is a gas, so 40Ar escapes into the atmosphere once it forms. Suppose a sample of granite originally contained 20 g of 40K, but it now contains only 5 g. How many half-lives have passed? How old is the rock? You can submit your answers as a text entry or file upload. Be sure to answer both questions! Expert Answer
Answers
The number of half-lives passed is 2. The rock is approximately 2.6 billion years old. Half-life refers to the time it takes for half of a substance or quantity of a radioactive isotope to undergo decay, while the remaining half remains unchanged.
The decay of 40K to 40Ar occurs with a half-life of 1.3 billion years. As 40Ar is a gas and escapes into the atmosphere, a granite sample that originally contained 20 g of 40K now only contains 5 g. The number of half-lives passed can be found using the formula: Nf/No = (1/2)^n, where Nf is the final amount, No is the initial amount, n is the number of half-lives passed. Substituting the given values, we get: 5/20 = (1/2)^n(1/4) = (1/2)^n. Taking logarithm on both sides, we get: log(1/4) = n log(1/2)-2 = -n. Hence, the number of half-lives passed is 2. Now, for age of the rock, we use the formula: t = n × t1/2, where t is the age of the rock, n is the number of half-lives passed, and t1/2 is the half-life of the isotope. Substituting the given values, we get: t = 2 × 1.3 billion years= 2.6 billion years. Therefore, the rock is approximately 2.6 billion years old.
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What will happen when a base reacts with an acid?
A salt and water will form.
There will be no reaction.
The base will increase in concentration.
The acid will increase in concentration.
Answers
Answer:
When acid reacts with base it will form salt and water
When a base reacts with an acid, a salt and water will form. Therefore, the correct option is option A.
What is acid base reaction?The exchange of one or perhaps more hydronium ions, H+, amongst species that can be either neutral (molecules like water, H2O, or acetic acid, CH3CO2H), or electrostatic attraction (ions like ammonium, NH4+, hydroxide, OH, or carbonate, CO32), is what is known as an acid-base reaction.
It also includes equivalent behavior of acidic ions and molecules (aluminum chloride, AlCl3, as well as the silver ion AG+) that do not give hydrogen ions. When a base reacts with an acid, a salt and water will form.
Therefore, the correct option is option A.
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An air plane is flying at a crusing speed of 200 miles per hour for 3 hours. How far would the plane fly?
Answers
A squirrel running up a tree and sitting on a branch shows what kind of
energy conversion?
A. Chemical potential energy converting to kinetic energy
B. Gravitational potential energy converting to heat energy
C. Heat energy converting to kinetic energy
D. Kinetic energy converting to gravitational potential energy
Answers
Answer:
d
Explanation:
its right to be sydinachiondical
Answer:
D. Kinetic energy converting to gravitational potential energy.
APEX
Does NaCI have a high melting point
Answers
Answer:
Yes, at 801 °C
Explanation:
A water skier is pulled by a net force of 168 N and has an acceleration of 2.4 m/s2. What is the mass of the skier?
A.
403.2 kg
B.
70 kg
C.
60 kg
D.
72 kg
Answers
Answer:
70kg
Explanation:
Direction: Read each situation in the table below, then state if it is a density-independent limiting factor or a density-depent limiting factor. Indicate the specific limiting factor that is occuring.
☞︎︎︎Please help me☜︎︎︎
❌NONSENSE➪ REPORT❌
Answers
Answer:
1. Dependent, carrying capacity
2. Dependent, dinoflaggelates
3. Independent, oil spill
4. Dependent, virus
5. Independent, typhoon
6. Independent, deforestation
7. Dependent, predation
8. Dependent, human exploitation
9. Dependent, virus
10. Independent, oxygen depletion
Explanation:
what is the mass of 1 mole of water
Answers
Answer:
18.01528 g/mol
Explanation:
Using the equation to figure this out
Answer:
18.01528 g/mol
5. An object is a regular, rectangular, solid with dimensions of 2 cm by 3cm by 2cm. It has a mass of 24 g. find its density.
Answers
Answer:
Density, D = 2g/cm^3
Explanation:
Given the following data;
Length = 2cm
Width = 3cm
Height = 2cm
Mass = 24g
Density = ?
Volume of a rectangular solid (V) = Length × Weight × Height
Therefore, V = L× W × H
Substituting the values, we have;
\(V = 2 *3 * 2 = 12\)
V = 12cm
Density can be defined as the ratio of mass to volume i.e mass all over volume.
Mathematically, \(Density = \frac{Mass}{Volume}\)
\(D = \frac{M}{V}\)
Substituting the values, we have;
\(D = \frac{24}{12}\)
Density, D = 2g/cm^3
Hence, the density of the rectangular solid is 2g/cm^3.
What is the difference between a plain and a plateau? A. Only a plain is flat, a plateau is steep mountainside. B. Both are flat, but a plateau is bordered by cliffs. C. A plain is rolling hills with cliffs, and a plateau is large flat area.
Answers
Answer:
B
Explanation:
Both plain and plateau have flat surfaces. However, a plain is located in a low-lying area while a plateau is located on an elevated area. In essence, a plateau can be viewed as an elevated plain or a plain that is bordered by cliffs.
The correct option is B.
How many half-lives have passed if a rock contains 25% parent isotopes and 75% daughter isotopes?.
Answers
If a rock contains 25% parent isotopes and 75% daughter isotopes, then two half-lives have passed.This is because, after one half-life, half of the parent isotopes will have decayed into daughter isotopes. So, after two half-lives, 75% of the parent isotopes will have decayed.
The half-life of a radioactive isotope is the time it takes for half of the atoms to decay. The half-life of an isotope is constant regardless of how much of the isotope is present.
There are a few different ways to calculate the half-life of rocks using isotopes.
One way is to use the decay constant of the isotope. The decay constant is the probability of an atom decaying per unit time. The half-life is then calculated by taking the natural logarithm of 2 and dividing it by the decay constant.
Another way to calculate the half-life of rocks using isotopes is to use the half-life formula.
The half-life formula is:
t ½ = ln(2) / λ
Where t1⁄2 is the half-life and λ is the decay constant ( λ = 0.693 )
t ½= ln(2) / 0.693
t ½= 0.693 / 0.693
t ½ = 11 t ½ from 100% to 50%
2 t ½ from 50% to 25%
The rock has 25% of Original Parent rock and 75% of Daughter Material, which means it has passed 2 half-life cycles.
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what is the whole definition of plancks constant..?
Answers
Answer:
Planck's constant, represented by h, relates the energy in one quantum (photon) of electromagnetic radiation to the frequency of that radiation. In the International System of units (SI), the constant is equal to approximately 6.626176 x 10-34 joule-seconds.
Explanation:
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How many electrons must be gained by nitrogen, N, to achieve a stable electron
configuration?
Answers
Answer:
3 electrons
Explanation:
Nitrate needs 3 electrons to achieve a stable electron configuration
Three is the answer. it needs three to complete its shell
Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters
Answers
The correct order of the increasing polarity of the analyte functional group isEthers < Esters.
The given statement is "Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters." The order of polarities of functional groups is the order of their increasing polarity (i.e., less polar to more polar) based on their electron-donating or withdrawing ability from the rest of the molecule.Polarity of analyte: The analyte's polarity is directly proportional to the dipole moment of the functional group, which is associated with a difference in electronegativity between the atoms that make up the functional group.The electronegativity of an element is its ability to attract electrons towards itself. The greater the difference in electronegativity between two atoms, the more polar their bond, and hence the greater the polarity of the molecule.
To find the correct order of the increasing polarity of the analyte functional group, let's first compare the two groups: hydrocarbon ethers and esters. Here, esters have a carbonyl group while ethers have an oxygen atom with two alkyl or aryl groups. The carbonyl group has more electronegative oxygen, which pulls electrons away from the carbon atom, resulting in a polar molecule. On the other hand, ethers have a less polar oxygen atom with two alkyl or aryl groups, making them less polar than esters. Therefore, the correct order of the increasing polarity of the analyte functional group isEthers < Esters.
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Why are all molecules not compounds?
Answers
Answer:
Explanation:
All compounds are molecules, but not all molecules are compounds. That is because a molecule can be made up of two atoms of the same kind, as when two oxygen atoms bind together to make an oxygen molecule. However, all compounds are made up of two or more different types of atoms.
Answer:
the last one
Explanation: