The ability of a metal to be drawn out into thin wires is a ______________.

• physical property

• physical change.

• chemical property

• chemical change

The proportions of substances in a mixture ___________________ .

• are always equal for each substance in the mixture

• can vary among the substances.

• never can be determined accurately.

• are always the same for each substance

A mixture in which particles are so small they cannot be seen with a microscope is a _____________________.

• heterogeneous mixture

• suspension

• element

• solution

A(n) ________ is a substance in which all the atoms in it are alike.

• compound

• solution

• element

• mixture

Which of the following is a compound?

• oxygen

• silicon

• vinegar

• milk

Which of the following is a substance?

• cheese

• milk

• tea

• water

A change in size, shape, or state of matter is a _________________ .

• physical property

• physical change

• chemical property

• chemical change

Which of the following is an example of physical weathering?

• acid rain corroding a statue.

• Formation of stalactites in a cave

• Formation of a canyon by a flowing stream.

• Change of calcium carbonate in limestone to calcium hydrogen carbonate.

If using a microscope allows you to see substances in a mixture, that mixture is ____ .

• heterogeneous

• homogeneous

• solution

• microgeneous

Scientists have broken down protons and neutrons into smaller particles called ___ .

• quarks

• nuclei

• vacuoles

• isotopes