Chemistry Midterm

What happens if you test a hypothesis multiple times and the data doesn’t support your prediction?

• You should change the data to support your prediction

• Run the experiment again until you get the results you are looking for

• Conclude that your hypothesis cannot be proven

• Change your hypothesis

Before you form a hypothesis, you should______________.

• Conduct the experiment

• Make some observations

• Ask your friends what they think

• Ask your teacher

A compound is

• a pure substance that cannot be broken down into simpler, stable substances.

• a substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances.

• the smallest unit of matter that maintains its chemical identity.

• any substance, whether it is chemically bonded or not.

A mixture is

• a combination of pure substances bonded chemically.

• any substance with a uniform composition.

• a blend of any two or more kinds of matter, as long as each maintains its own unique properties.

• any group of elements that are chemically bonded to one another.

If a mixture is not uniform throughout, it is called

• homogeneous

• heterogeneous

• chemically bonded

• a solution

The base units for length and mass are

• centimeter and gram

• meter and Kg

• centimeter and pound

• meter and gram

1.06 L of water is equal to

• 0.00106 mL

• 10.6 mL

• 106 mL

• 1060 mL

How many centimeters are in 1 meter?

• 0.01

• 0.1

• 10

• 100

The equation for density is

• density / mass

• mass * volume

• volume / mass

• mass / volume

Which of these is an example of a physical change?

• Burning a piece of paper.

• Reacting copper with nitric acid to make copper nitrate.

• Ripping a piece of paper.

• A copper statue corroding from exposure to the weather.