States of Matter

Water is the resource used for drinking and hydration. While the phrasing 'fresh drink' is slightly awkward, the intent is clearly about drinking water. Rocks and soil are not consumed as beverages.

Melting ice is a phase change from solid to liquid. The substance remains water, so it is a physical change.

Melting is a phase change where the substance remains water (H2O) regardless of whether it is solid or liquid. Since the chemical identity does not change, it is a physical change.

Crumbling paper changes its shape and appearance but does not alter its chemical composition. Therefore, it is a physical change.

A chemical change is defined by the transformation of substances into one or more new substances with different chemical properties. Physical changes only alter the state or form of the existing substance.

Chicken noodle soup is a heterogeneous mixture because the components are not uniformly distributed and can be easily separated. Solutions like sea water and Kool-aid are homogeneous mixtures where the solute is evenly dissolved.

A solution is a specific type of homogeneous mixture. Since there are also heterogeneous mixtures, not all mixtures qualify as solutions.

Liquids have a fixed volume because their particles are close together, but they lack a fixed shape and will take the shape of their container.

Gases have high kinetic energy, allowing particles to move freely and expand to fill any available space, resulting in no definite shape or volume.

Solids have particles packed in a rigid structure, giving them a definite shape and a definite volume.

A compound is a substance formed when two or more chemical elements are chemically bonded together in a fixed ratio.

Elements are pure substances consisting of only one type of atom and cannot be broken down into simpler substances by chemical means.

A mixture consists of two or more substances physically combined, meaning they are not held together by chemical bonds. Molecules and compounds are held together by chemical bonds.

Density is mass per unit volume. If a liquid is denser than another, it will sink to the bottom when the two are mixed, assuming they are immiscible.

A chocolate cookie is a mixture because it is composed of various ingredients (flour, sugar, chocolate chips, etc.) that are physically combined and can be separated.