Answer the following question given this paragraph: All of the changes of state that occur between solid, liquid and gas are summarized in the diagram in the figure below. Freezing is the opposite of melting and both represent the equilibrium between the solid and liquid states. Evaporation occurs when a liquid turns to a gas. Condensation is the opposite of vaporization and both represent the equilibrium between the liquid and gas states. Deposition is the opposite of sublimation and both represent the equilibrium between the solid and gas states. Q: What is the opposite of melting? Choices: - evaporation - liquidation - compression - freezing A:
freezing
------
Answer the following question given this paragraph: Chemical sedimentary rocks form when crystals precipitate out from a liquid. The mineral halite, also called rock salt, forms this way. You can make halite! Leave a shallow dish of salt water out in the Sun. As the water evaporates, salt crystals form in the dish. There are other chemical sedimentary rocks, like gypsum ( Figure below ). Q: What are formed when crystals precipitate out from a liquid? Choices: - diamonds - additive sedimentary rocks - gaseous sedimentary rocks - chemical sedimentary rocks A:
chemical sedimentary rocks
------
Answer the following question given this paragraph: When studying the different states that matter exhibits, we have been looking at pure substances . Pure substances have a constant composition and can only be changed through chemical reactions. Constant composition indicates that a sample of a pure substance always contains the same elements in the same proportions. There are two main types of pure substances:. Q: Pure substances have a constant composition and can only be changed through what? Choices: - heating - dissolution - liquid reactions - chemical reactions A:
chemical reactions
------
Answer the following question given this paragraph: Gravity near the Earth pulls an object downwards toward the surface of the Earth with an acceleration of . In the absence of air resistance, all objects will fall with the same acceleration. The letter is used as the symbol for the acceleration of gravity. When talking about an object's acceleration, whether it is due to gravity or not, the acceleration of gravity is sometimes used as a unit of measurement where . So an object accelerating at 2g's is accelerating at or. Q: Represented in equations by the letter "g", what pulls objects down to the earth's surface? Choices: - energy - motion - light - gravity A:
gravity
------