Regents Chemistry Matter

Two grams of potassium chloride are completely dissolved in a sample of water in a beaker. This solution is classified as

• an element

• a compound

• a homogeneous mixture

• a heterogeneous mixture

A substance is classified as either an element or a

• compound
• solution
• heterogeneous mixture
• homogeneous mixture

Which substance can not be broken down by a chemical change?

• ammonia
• arsenic
• ethane
• propanal

Tags

NGSS.MS-PS1-2

Bronze contains 90 to 95 percent copper and 5 to 10 percent tin. Because these percentages can vary, bronze is classified as

• a compound

• an element

• a mixture

• a substance

Which substance can be decomposed by chemical means?

• tungsten

• antimony

• krypton

• methane

Tags

NGSS.MS-PS1-2

Which is a mixture of substances?

• liquid

• solid

• solution

• gas

A beaker has alcohol and water. These liquids can be separated by distillation because the liquids have different

• boiling points

• densities

• particle sizes

• solubilities

Tags

NGSS.MS-PS1-4

A mixture of sand and table salt can be separated by filtration because the substances in the mixture differ in

• solubility in water

• boiling point

• density at STP

• freezing point

When a mixture of water, sand, and salt is filtered, what passes through the filter paper?

• water and salt, only

• water and sand, only

• water, sand, and salt

• water, only

Tags

NGSS.MS-PS1-2

Natural gas can be separated by distillation because the mixture contains

• elements with the same boiling points

• elements with different boiling points

• compounds with the same boiling points

• compounds with different boiling points