MANDATORY WINTER BREAK ASSIGNMENT

Front

What happens when atoms absorb energy?

Back

Their electrons move to higher energy levels.

Front

What do electrons do when they return to lower energy levels?

Back

They lose energy by emitting light.

Front

What is a mixture?

Back

A combination of two or more substances that retain their individual properties.

Front

What is a fission reaction?

Back

A nuclear reaction where the nucleus of an atom splits into smaller parts.

Front

What is the formula to calculate volume using density and mass?

Back

Volume = Mass / Density.

Front

If a block of aluminum has a mass of 93.4 g and a density of 2.7 g/cm³, what is its volume?

Back

34.6 cm³.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the definition of density?

Back

Density is the mass of a substance divided by its volume.

Front

What is a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed.