Checkpoint practice 2024 part 2

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 a change in color, temperature, or the production of gas.

Front

What happens to iron when it rusts?

Back

When iron rusts, it undergoes a chemical change that results in the formation of iron oxide, which appears as a rusty orange color.

Front

What is temperature a measure of?

Back

Temperature is a measure of the average kinetic energy of the particles in a substance.

Front

What causes condensation on a cold glass?

Back

Condensation occurs when water vapor in the air cools and changes into liquid water upon contact with the cold surface of the glass.

Front

What is density?

Back

Density is the mass of a substance divided by its volume, determining whether an object will float or sink in a fluid.

Front

Which materials are less dense than water?

Back

Materials like cork, wood, and certain plastics are less dense than water and will float.

Front

What are elements?

Back

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

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the role of kinetic energy in temperature?

Back

Kinetic energy is the energy of motion; in temperature, it refers to the motion of particles in a substance, with higher temperatures indicating faster particle movement.

Front

What is the process of evaporation?

Back

Evaporation is the process where liquid water turns into water vapor, usually occurring at the surface of the liquid.