Physical And Chemical Changes Test #1 By Kelsey Sleasman & Miranda Jackson

The state of H20 is liquid because at room temperature and atmospheric pressure, water exists in a liquid state.

Evaporation is the process by which a liquid turns into a gas. It occurs when the molecules of a liquid gain enough energy to break free from the liquid's surface and become vapor. This process does not involve any change in the state of matter from solid to gas or liquid to solid. Additionally, evaporation is an endothermic process, meaning it absorbs heat from the surroundings rather than giving off heat.

When something on the stove is bubbling, it is boiling. Boiling occurs when a liquid reaches its boiling point and starts to vaporize rapidly, forming bubbles. The heat from the stove causes the molecules in the liquid to gain energy and move faster, eventually overcoming the attractive forces between them and turning into gas. This process is accompanied by the formation of bubbles, resulting in the characteristic bubbling seen when something is boiling.

Physical properties refer to the characteristics of a substance that can be observed or measured without changing its chemical composition. Color is one of the physical properties that describes the visual appearance of a substance. It is determined by the way the substance interacts with light, absorbing certain wavelengths and reflecting others. Different substances can have different colors, allowing for their identification and differentiation.

Flammability is the ability of a substance to burn or ignite when exposed to a flame or heat. It is a chemical property because it is a characteristic that is determined by the chemical composition and structure of the substance. The presence or absence of flammability can have important implications for safety and handling of the substance.

A chemical change refers to a process in which the substances involved undergo a transformation at the molecular level, resulting in the formation of new substances with different chemical properties. One of the indicators of a chemical change is the presence of a new odor, suggesting that the original substances have been chemically altered to produce different compounds. This change is not easily reversible, as it involves the breaking and forming of chemical bonds. The other options, such as size, shape, and being easily reversed, do not necessarily indicate a chemical change.

A physical change refers to a transformation in the physical properties of a substance without altering its chemical composition. The options "light," "new sound," and "color change" do not accurately define a physical change. However, "change in state" is a correct explanation as it describes the conversion of a substance from one state (solid, liquid, or gas) to another, such as ice melting into water or water evaporating into steam.

The formation of a new chemical indicates a chemical change. In a chemical change, the substances involved undergo a transformation at the molecular level, resulting in the formation of new substances with different properties. This is different from a physical change, where the substances may undergo a change in state or appearance, but their molecular composition remains the same. Therefore, the formation of a new chemical is a clear indication of a chemical change taking place.

Reactivity is a chemical property because it describes the ability of a substance to undergo a chemical reaction or to interact with other substances. It is a characteristic of a substance that can be observed when it reacts with another substance, such as when it oxidizes, corrodes, or combusts. Reactivity is not a physical property because it does not depend on the substance's physical state or appearance, but rather on its chemical composition and behavior.

The given answer, "physical property," is correct because color is a characteristic of a substance that can be observed without changing its chemical composition. It is a physical attribute that can be used to identify and classify substances. Unlike chemical changes, which involve the formation of new substances with different properties, color does not indicate a change in the chemical composition of a substance. Therefore, it is considered a physical property.

Color is a physical property because it can be observed and measured without changing the substance's chemical composition. However, color can also be influenced by chemical changes, such as when a substance undergoes a chemical reaction and its color changes as a result. Therefore, color can be considered both a physical property and a result of chemical changes.