A pure substance...

• is an element or a compound
• is an element or a mixture
• is a compound or a mixture
• is a mixture

Two or more physically combined substances form —

• a compoud
• an acid
• an element
• a mixture

What is an example of a mixture?

• Table salt

• Water

• Oxygen

• Air

What is the definition of a compound?

• The smallest part of any substance which can exist on its own

• Two or more atoms chemically joined together (can be the same or can be different)

• A simple substance in which all the atoms are identical

• Two or more different elements chemically joined together

This picture represents which of the following?

• element
• compound
• mixture

Tags

NGSS.MS-PS1-1

This picture represents which of the following?

• element
• compound
• mixture

Tags

NGSS.MS-PS1-1

The smallest unit of a compound is

• an element.

• a molecule.

• an atom.

• a mixture.

Which tools are best for separating a mixtures of sand, iron filings, and water?

• Hot plate and filter

• Tweezers and filter

• Filter and magnet

• Magnet and hot plate

Which substances, when mixed together, maintain their original physical properties?

• gravel and water

• wood chips, water and sand

• sand and water

• all of the above

Which mixture can be separated using a filter?

• sand and iron filings

• saltwater

• sand and water

• none of the above