Checkpoint practice 2024 part 1

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, often accompanied by energy changes, color changes, or the production of gas.

Front

What happens to iron when it rusts?

Back

When iron rusts, it undergoes a chemical change, reacting with oxygen and moisture in the air to form iron oxide, which appears as a rusty orange color.

Front

What is nitrogen dioxide?

Back

Nitrogen dioxide (NO2) is a brown gas produced from combustion processes, such as those in vehicles and factories, as well as from natural sources like forest fires.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties and can be separated by physical means.

Front

What are the states of matter?

Back

The states of matter are solid, liquid, gas, and plasma, which describe the physical forms that substances can take based on temperature and pressure.

Front

What occurs during condensation?

Back

Condensation is the process where a gas cools and changes into a liquid, such as when water vapor in the air forms droplets on a cold surface.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means and is made up of only one type of atom.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements chemically bond together, while a mixture is a physical combination of substances that retain their individual properties.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is evaporation?

Back

Evaporation is the process where liquid water turns into water vapor (gas) when it is heated, often occurring at the surface of the liquid.