2020 Chemistry Semester 1

Another name for a homogeneous mixture is

• solution

• matter

• element

• mass

The chemical symbol for helium is

• He

• HE

• H

• Li

Which of the following is a physical property?

• color

• hardness

• freezing point

• all of the above

Which of the following is an example of a physical change?

• toasting bread

• cooking a hamburger

• digesting a banana

• melting butter

Which of the following is a compound?

• carbon

• hydrogen

• water

• oxygen

Which of the following is an example of a chemical change?

• cooking meat

• slicing cheese

• dissolving sugar in tea

• freezing water

Iron is an example of a(n)

• element

• compound

• heterogeneous mixture

• homogeneous mixture

An example of a heterogeneous mixture would be

• sugar

• salt water

• tap water

• vegetable soup

Which of the following is correct?

• electrons are positive

• protons are negative

• neutrons have no charge

• atoms are positively charged

The identity of an element can be determined on the basis of which of the following?

• the number of protons

• the number of neutrons

• the mass number

• the atomic mass