Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas. The reactants in this reaction are

• magnesium and magnesium chloride
• hydrochloric acid and hydrogen gas
• magnesium and hydrochloric acid
• magnesium chloride and hydrogen gas

Matter that has a definite shape and a definite volume is

• a liquid. 
• an element. 
• a solid.
• a gas.

We know that air is a mixture and not a compound because

•  it can be heated to a higher temperature.
• it can be compressed to a smaller volume.
• it is colorless.
• its composition can vary.

Matter can be defined as anything that

• has weight.
• has mass and volume.
• is uniform throughout.
• exhibits both chemical and physical properties.

Which of the following is best classified as a homogeneous mixture?

• pizza 
•  blood 
• hot tea
• copper wire

A compound differs from a mixture in that a compound

• contains only one element.
• varies in chemical composition depending on the   sample size.
• has a definite composition by mass of the   elements that the compound contains.
• can be classified as either heterogeneous or   homogeneous.

Tags

NGSS.MS-PS1-1

Which of the following is not a physical state of matter?

• solid 
• element
• gas 
• liquid

Tags

NGSS.5-PS1-3

Three of the following must contain two or more kinds of atoms. Which one does not contain two or more kinds of atoms?

• element
• compound
• homogeneous mixture
• heterogeneous mixture

Tags

NGSS.MS-PS1-1

Which of the following symbols does not match the element name given?

• Al, aluminum
• Co, copper
• K, potassium
• P, phosphorus

In trying to identify a sample of a pure substance, we observe the following properties. Tell whether each one is a chemical property or a physical property.
Its mass is 124.3 g.

• chemical property
• physical property