What is an element in chemistry?

• A pure substance consisting of only one type of atom

• A substance formed by chemically bonding two or more elements

• A combination of substances not chemically bonded

• A mixture of gases

Which of the following is a homogeneous mixture?

• Salt dissolved in water

• A salad with various ingredients

• A bowl of cereal with milk

• Oil and vinegar dressing

What separation technique is commonly used to separate solids from liquids in a heterogeneous mixture?

• Filtration

• Distillation

• Chromatography

• Centrifugation

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

• A bowl of cereal with milk

• Air

• Salt dissolved in water

• A solution of sugar in tea

What is the primary difference between compounds and mixtures?

• Compounds are chemically bonded; mixtures are not

• Compounds consist of one type of atom; mixtures consist of multiple types

• Compounds are always homogeneous; mixtures are always heterogeneous

• Compounds can be separated by filtration; mixtures cannot

Organize these mixtures into the correct categories

Groups:

(a) Heterogeneous Mixtures

,

(b) Homogeneous Mixtures

,

(c) Compounds

,

(d) Elements

• glucose
• iron
• air
• saltwater
• gold
• vegetable soup

• raisin bran cereal

• water
• ammonia
• carbon
• milk
• hydrogen
• trail mix

• bowl of candy

• sodium chloride
• steel
• carbon dioxide
• oxygen
• salad

• vinegar

Tags

NGSS.MS-PS1-1

Match the following ways to separate mixtures

• Separating solids from liquids

• Evaporation

• Removing solvent to leave solute by heat

• Filtration

• Separating components based on boiling points

• Magnet

• Separate by density

• Centrifuge

• Removing iron from cereal

• Distillation

Columns in The Periodic Table are called ​ (a)  

• groups
• periods
• rows
• alkali metals

Mixtures are combined ___________.

What type of mixture is natural gas?

• homogeneous

• heterogeneous

• colloid

• centrifugal