Which is the most important factor in determining the state of a substance?
Answers
Out of the following given choices;
A. the size of the atoms in a substance
B. the number of molecules in a substance
C. the position of the electrons on the outer valence shells
D. the balance between intermolecular forces and kinetic energy
The answer is D. The kinetic energy of the molecules is determines by the temperatures of the substance. The higher the temperatures, the higher the kinetic energy of the molecules. The molecules subsequently move and collide with higher energies and overcome intermolecular forces. This allows the substance to changes state from solid to liquid and eventually to gas (with increasing kinetic energy).
This is important because by increasing or decreasing a substance's temperature, you are also adding or removing energy from it. And when a substantial amount of energy has been added or removed, a substance can change its state from solid > liquid > gas or the other way around.
Related Questions
If 62.8 g Ca react with 92.3 g HCl according to the reaction below, how many grams of hydrogen gas will be produced, and how many grams of the excess reactant will be left over?Unbalanced equation: Ca + HCl → CaCl2 + H2
Yesterday we combined Hydrochloric Acid HCl with Sodium Hydroxide NaOH in a violent reaction that resulted in water H2O and common table salt NaCl. How many grams of hydrochloric acid should we use so we have exactly enough to react with 40g of sodium hydroxide? You'll need to write a chemical reaction, balance it, and then perform your calculation. also how many grams of salt NaCl will be produced and how many grams of water H2O be produced?
Balance this chemical equation: ___ N2 (g) __O2 (g) → ___ H2O ___ NO3 (aq)
Which of the following is true in regard to ions?
(2) helium gas
(3) greenhouse gases, such as CO2
(4) radioisotopes with long half-lives
Answers
Answer: Option (4) is the correct answer.
Explanation:
In a nuclear power plant, nuclear fission and fusion reactions occur.
During these reaction a large amount of heat is releases along with the release of radioisotopes. These radioisotopes have long half-lives as a result these emit harmful radiations which can either cause burns or blindness to the people around the nuclear power plant etc.
For example, isotope of Uranium-238 have longer half life.
Thus, we can conclude that a serious risk factor associated with the operation of a nuclear power plant is the production of radioisotopes with long half-lives.
Final answer:
The major risk associated with the operation of nuclear power plants is the generation of radioisotopes with long half-lives, such as cesium-137 and strontium-90. These remain harmful for thousands of years.
Explanation:
A serious risk factor associated with the operation of a nuclear power plant is the production of radioisotopes with long half-lives. Apart from the immediate dangers posed by nuclear accidents, these radioisotopes, such as cesium-137 and strontium-90, remain radioactively harmful for a long period of time, often thousands of years. Safe containment and disposal of these substances is a significant challenge associated with nuclear energy production.
In contrast, acid rain is generally caused by burning fossil fuels, not nuclear power. Nuclear power plants do not produce significant amounts of greenhouse gases such as CO2. Helium gas is one of the byproducts of nuclear fusion, not fission, which is used in nuclear power plants, and is not dangerous.
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0 atoms of carbon.
c.
6 atoms of carbon.
b.
1 atom of carbon.
d.
12 atoms of carbon.
Answers
Answer : The correct option is, (d) 12 atoms of carbon.
Explanation:
The formula of given molecule of table sugar is,
The given molecule is made up of three elements which are, carbon, hydrogen and oxygen.
In the given molecule of table sugar , there are 12 number of carbon atoms, 22 number of hydrogen atoms and 11 number of oxygen atoms.
From the given options we conclude that, the option (d) is the correct option. While the other options are incorrect.
Hence, the correct option is, (d) 12 atoms of carbon.
Calculate ΔG°rxn for the following reaction. 18 NO(g) → 6 N2O(g) + 6 NO2(g)
Answer Choices To Choose From: A) -3.83 kJ B) -138 kJ C) -23.0 kJ D) 23.0 kJ E) 138 kJ
Part B
CO2(g)→C(s)+O2(g)ΔH∘rxn= +393.5 kJ
(ΔSsys<0, ΔSsurr<0)
In addition, predict under what temperatures (all temperatures, low temperatures, or high temperatures), if any, the reaction in part D will be spontaneous
A) The reaction is spontaneous at all temperatures.
C) The reaction is spontaneous at high temperatures.
D) The reaction is nonspontaneous at all temperatures.
Answers
Since dH is positive and dS ~ 0 then -TdS ~ 0, meaning dG will always be greater than 0 so the reaction is spontaneous at high temperatures.
Weight
Density
Size
Answers
It would not be:
Mass : Because mass is a measurement not dependent on gravity
Density : Astronauts do not blow out in bubbles once they leave the earth's atmosphere, therefore, we can deduct that density stays the same
Answers
Hydrogen is being oxidized in the given reaction CO2 + H2 → CO + H2O. the carbon atom in CO2 is reduced to CO, while the hydrogen atoms in H2 are oxidized to H2O.
How is that so?
Oxidation is the loss of electrons, while reduction is the gain of electrons. To determine which class is being oxidized and that is being diminished, we can equate the oxidation states of the materials in the reactants and produce.
In CO2, the element atom has an oxidation state of +4, while the oxygen atoms each have an disintegration state of -2. In H2, each hydrogen atom has an decay state of 0.
In CO, the element atom has an oxidation state of +2, while the oxygen dot in H2O has an oxidation state of -2. The hydrogen atoms in H2O each have an disintegration state of +1.
Therefore, the carbon atom in CO2 is decreased to CO, while the hydrogen atoms in H2 are oxidized to H2O.
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c. polymer
b. isomer
d. elements
Answers
Final answer:
A polymer is a large molecule consisting of many repeating structural units or monomers. The process of formation is called polymerization.
Explanation:
The correct answer to this question is c. polymer. Polymers are large molecules made up of repeating subunits known as monomers. The process in which these monomers connect to form a polymer is called polymerization. An example of a polymer is plastic, which consists of many repeating units of smaller molecules.
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