Question
During exothermic reactions:
a. heat is transformed into potential energy
b. kinetic energy is transformed into bond energy
c. potential energy is transformed into bond energy
d. potential energy is transformed into kinetic energy
a. heat is transformed into potential energy
b. kinetic energy is transformed into bond energy
c. potential energy is transformed into bond energy
d. potential energy is transformed into kinetic energy
Answers
Answer
2. Which of the following are chemical changes?
a. mercury has a density of 13600 kg/m3
b. potassium reacts with water
c. hammer a nail into a piece of wood
d. a rotting apple
e. potassium is a soft metal
f. evaporation of water g. sublimation of dry ice
h. dissolve sugar in water
i. a growing flower
j. hydrogen is a flammable gas
a. mercury has a density of 13600 kg/m3
b. potassium reacts with water
c. hammer a nail into a piece of wood
d. a rotting apple
e. potassium is a soft metal
f. evaporation of water g. sublimation of dry ice
h. dissolve sugar in water
i. a growing flower
j. hydrogen is a flammable gas
Answered by
GPT 3.5
c. potential energy is transformed into bond energy
Answered by
GPT 3.5
The chemical changes among the given options are:
b. potassium reacts with water - This is a chemical change because a chemical reaction occurs between potassium and water, resulting in the formation of potassium hydroxide and hydrogen gas.
d. a rotting apple - This is a chemical change because the organic matter in the apple undergoes decomposition, resulting in the formation of new substances through chemical reactions.
f. evaporation of water - This is a physical change, not a chemical change. Evaporation is the process by which water changes from a liquid to a gas state without undergoing a chemical reaction.
g. sublimation of dry ice - This is a physical change, not a chemical change. Sublimation is the process by which a substance directly changes from a solid to a gas state without going through the liquid phase.
h. dissolve sugar in water - This is a physical change, not a chemical change. Dissolution is a physical process where a solute (sugar) disperses in a solvent (water) without any chemical reaction occurring.
i. a growing flower - This is a biological process involving the growth and development of plant cells, which includes chemical changes occurring within the plant. However, strictly speaking, the growth and development of a flower is a biological process and not solely a chemical change.
j. hydrogen is a flammable gas - The statement is true, but it describes a physical property of hydrogen rather than a chemical change. Flammability is a property of a substance, and it does not necessarily involve a chemical reaction.
Therefore, the correct chemical changes among the options are b. potassium reacts with water and d. a rotting apple.
b. potassium reacts with water - This is a chemical change because a chemical reaction occurs between potassium and water, resulting in the formation of potassium hydroxide and hydrogen gas.
d. a rotting apple - This is a chemical change because the organic matter in the apple undergoes decomposition, resulting in the formation of new substances through chemical reactions.
f. evaporation of water - This is a physical change, not a chemical change. Evaporation is the process by which water changes from a liquid to a gas state without undergoing a chemical reaction.
g. sublimation of dry ice - This is a physical change, not a chemical change. Sublimation is the process by which a substance directly changes from a solid to a gas state without going through the liquid phase.
h. dissolve sugar in water - This is a physical change, not a chemical change. Dissolution is a physical process where a solute (sugar) disperses in a solvent (water) without any chemical reaction occurring.
i. a growing flower - This is a biological process involving the growth and development of plant cells, which includes chemical changes occurring within the plant. However, strictly speaking, the growth and development of a flower is a biological process and not solely a chemical change.
j. hydrogen is a flammable gas - The statement is true, but it describes a physical property of hydrogen rather than a chemical change. Flammability is a property of a substance, and it does not necessarily involve a chemical reaction.
Therefore, the correct chemical changes among the options are b. potassium reacts with water and d. a rotting apple.
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