Physical Science Mid-term Review

A chemical change is a process where substances combine or break apart to form new substances, such as grilling a hamburger.

Metalloids are elements that have properties of both metals and nonmetals, such as silicon and germanium.

Sublimation is the process where a solid changes directly into a gas without passing through the liquid state, like dry ice turning into carbon dioxide gas.

Melting is the process where a solid turns into a liquid, such as ice cream melting in warm temperatures.

Pure substances are materials that have a uniform and definite composition, including elements and compounds.

Elements are pure substances that consist of only one type of atom, while compounds are substances formed from two or more different types of atoms chemically bonded together.

Vaporization is the process of turning from a liquid into a gas, which includes both evaporation and boiling.

Condensation is the process where a gas turns into a liquid, often seen when water vapor cools and forms droplets.

Transition metals are elements found in groups 3-12 of the periodic table, known for their ability to form various oxidation states and colored compounds.

Halogens are a group of elements in group 17 of the periodic table, known for being highly reactive nonmetals, such as fluorine and chlorine.