1.
What forms a solid to a liquid?
Correct Answer
A. Melting
Explanation
Melting is the process by which a solid substance changes into a liquid state. This occurs when heat is applied to a solid, causing the particles to gain energy and move more rapidly, eventually breaking the bonds that hold them in a fixed position. As a result, the solid structure breaks down, and the substance transitions into a liquid form. Therefore, melting is the correct answer as it accurately describes the transformation from a solid to a liquid.
2.
What forms from a liquid to a solid?
Correct Answer
A. Freezing
Explanation
When a substance undergoes freezing, it changes from a liquid state to a solid state. This process occurs when the temperature of the substance drops below its freezing point, causing the molecules to slow down and arrange themselves in a more ordered and rigid structure. This transformation is commonly observed when water turns into ice at temperatures below 0 degrees Celsius. Therefore, freezing is the correct answer as it describes the specific change of state from liquid to solid.
3.
What goes from a liquid to a gas?
Correct Answer
A. Evaporation
Explanation
correct answer is evaporation
4.
What goes from a gas to a liquid?
Correct Answer
A. Condensation
Explanation
Condensation is the process by which a gas changes into a liquid. When a gas cools down, its particles lose energy and slow down, causing them to come closer together. As a result, the gas molecules form bonds and become a liquid. This process commonly occurs when warm air comes into contact with a cold surface, such as when water vapor in the air turns into liquid droplets on a cold window. Therefore, condensation is the correct answer to the question.
5.
What forms from a liquid to a gas?
Correct Answer
B. Evaporization
Explanation
Evaporization is the process by which a liquid changes into a gas. It occurs when the molecules of a liquid gain enough energy to overcome the attractive forces holding them together, causing them to escape into the surrounding environment as gas. This process is commonly observed when water boils and turns into steam. Condensation, on the other hand, is the opposite process where a gas turns into a liquid. Therefore, the correct answer is evaporization.
6.
Forms a solid.
Correct Answer
C. Solidification
Explanation
Solidification refers to the process by which a substance changes from a liquid or gas state to a solid state. This occurs when the substance loses enough heat energy to reduce its kinetic energy, causing the particles to come together and form a stable, organized structure. Therefore, solidification is the correct answer as it accurately describes the process of forming a solid.
7.
Forms a gas.
Correct Answer
B. Vaporization
Explanation
Vaporization is the process in which a substance changes from a liquid state to a gas state. When a substance undergoes vaporization, its molecules gain enough energy to overcome the intermolecular forces holding them together in the liquid phase. This results in the formation of a gas. Therefore, vaporization is the correct answer as it accurately describes the process of forming a gas.
8.
Forms a liquid.
Correct Answer
C. Liquefacation
Explanation
Liquefaction refers to the process of converting a substance from a solid or gas state into a liquid state. This explanation aligns with the statement "Forms a liquid." Both condensation and melting also involve the transition of a substance into a liquid state, but liquefaction specifically refers to the process of forming a liquid. Therefore, liquefaction is the correct answer in this context.
9.
What forms a solid to a gas?
Correct Answer
A. Sublimation
Explanation
Sublimation is the process in which a solid directly converts into a gas without passing through the liquid state. This occurs when the temperature and pressure conditions are such that the solid's vapor pressure exceeds the atmospheric pressure. Therefore, sublimation is the correct answer as it describes the transformation from a solid to a gas. Freezing is the opposite process, where a liquid changes into a solid, and condensation is the transformation from a gas to a liquid.
10.
What gives off heat?
Correct Answer
A. Exothermic
Explanation
Exothermic reactions release heat energy to the surroundings. This means that the reactants have more energy stored in their chemical bonds than the products, and the excess energy is released as heat. Examples of exothermic reactions include combustion, such as burning wood or gasoline, and the reaction between an acid and a base. In these reactions, the surroundings become warmer as heat is given off.