Physical vs chemical properties

Which of the following best defines a pure substance?

• A material made up of two or more elements chemically combined.

• A material that can be physically separated into simpler substances.

• A material that has a fixed composition and definite properties.

• A material that has no definite composition or properties.

What is a mixture?

• A substance that is made up of only one type of atom.

• A substance with a fixed composition and distinct properties.

• A combination of two or more substances that are not chemically combined.

• A substance that cannot be physically separated.

Which of the following is an example of a heterogeneous mixture?

• Sugar dissolved in water

• Vinegar

• A cup of coffee with sugar stirred in

• A bowl of cereal with milk

Choose the statement that best describes a homogeneous mixture.

• The components are visibly distinguishable.

• The composition and properties are uniform throughout.

• The mixture can be physically separated into its components.

• The substances are chemically combined.

Classify the following as a pure substance (PS) or a mixture (M):

Groups:

(a) PS

,

(b) M

• Sugar water

• Air

• Iron

• Carbon dioxide gas

In which of the following scenarios is a chemical change taking place?

• Quartz crystal fractures when struck.

• Sugar dissolves when poured into tea.

• Liquid water turns to a vapor at 100°C.

• Sodium metal reacts with water to form sodium hydroxide and hydrogen gas.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an extensive property of water?

• Boiling point of 100o C

• Chemical formula is H2O

• Density of 1.0 g/mL

• Volume of 100 mL

Which type of substances have a definite shape and fixed volume?

• Solids only

• Liquids and solids

• Gases only

• Liquids and gases

Which of these is not an intensive property?

• Temperature

• Mass

• Solubility

• Hardness

Tags

NGSS.MS-PS1-2