Grade 7 Science - Pure Substances & Mixtures

The Atom

100

The positively charged particle in an atom is called a..

Proton

200

The atomic mass is...

Protons and neutrons

300

Noble Gases are located in which group on the periodic table?

Group 8

400

Groups run _________ on the periodic table and represent the number of ___________ in the outter/valence _________ of each element 

Vertically

Electrons 

Shell

500

Periods run ___________ on the periodic table and represent the _____________________ of each element

Horizontally

Number of shells

States of Matter

100

When a liquid changes to a solid, it is called?

Freezing

200

This state of matter has a fixed shape.

Solid.

300

Which two states of matter can flow?

Liquid and Gas.

400

In which state of matter are the particles farthest apart?

Gas.

500

During distillation, we separate a mixture by boiling and evaporating one substance, then changing that gas back to a liquid in a cooling chamber and collecting it. When a gas cools and changes to a liquid it is called...?

Condensation

Pure Sub. or Mixture?

100

Pizza

Mixture

200

Salt

Pure Substance

300

Air

Mixture (Solution)

400

Aluminum Foil

Pure Substance

500

Tap Water

Mixture (Solution)

Separating Mixtures

100

Recycling Facilities use a magnetic drum to separate metals like tin cans and wire hangers from other materials.

Magnetism

200

When you make a pot of coffee, you're using this method of separation to make sure there are no coffee grounds in your cup!

Filtration

300

Using a strainer to look for gold in a river bed.

Sifting

400

To make maple syrup, sap is thickened by boiling off excess moisture in a vat for extended periods of time.

Evaporation

500

A process used to separate two liquids or a soluble solid in a liquid, where both are maintained at the end of the separating process

Distillation

Solutions

100

A solution with a higher solute to solvent ratio is..?

Concentrated

200

In a solution of cordial syrup and water, which is the solute and which is the solvent

Solute: cordial syrup

Solvent: Water

300

Name two substances that are insoluble.

Oil, sand, rocks, paper, flour, etc.

400

When a solution is "full" and cannot dissolve any more solute, we say it is...?

Saturated

500

You can add solvent to make a solution thinner or weaker. This is called...?

Diluting