Physical Science Midterm

Front

What is the density of water?

Back

1.00 g/cm³

Front

Which substance is most likely to float in water?

Back

Pine (because it has a lower density than water).

Front

Why are neon and argon not reactive?

Back

They have the maximum possible number of electrons in their outermost shell.

Front

What determines the identity of an atom?

Back

The number of protons.

Front

What coefficient must be placed in front of Al₂O₃ to balance the equation 4 Al + 3 O₂ → ___ Al₂O₃?

Back

2

Front

What property of matter is being investigated if a student is measuring how much mass is in a given volume?

Back

Density.

Front

What is the definition of density?

Back

Density is the mass of an object divided by its volume (Density = Mass/Volume).

Front

What is the significance of the number of protons in an atom?

Back

It determines the element's identity and its position on the periodic table.

Front

What is a characteristic of noble gases like neon and argon?

Back

They are chemically inert due to having full valence shells.

Front

How do you balance a chemical equation?

Back

By ensuring the number of atoms of each element is the same on both sides of the equation.