Solutions and Mixtures
Surface Tension
Separating Mixtures
Chemical Reactions
Acids and Bases
100

A substance made of two or more substances

A mixture

100

The scientific principle that allows bugs to walk on water.

Surface tension

100

Using a filter to separate sand from water

Filtration

100

If you mix two substances together and a new gas is formed

A chemical reaction

100

What is scale we use to measure acids and bases?

pH scale

200

A kind of mixture where the parts are evenly spread out

A homogenous mixture

200

True/False --> molecules in the middle of a liquid are pulled equally in all directions

True

200

Using heat to remove water from a solution

Evaporation

200

Physical / Chemical change: Salt is mixed with water

Physical

200

Acids have a higher concentration of which kind of ions?

Hydrogen ions

300

When a substance dissolves into another

A solution

300

The force of attraction between molecules of a substance

Cohesion

300
What would be the best way to separate iron pieces out of sand?

Magnetism

300

Physical / Chemical change: Paper is burned

Chemical

300

Bases have a higher concentration of which kind of ions?

Hydroxide ions
400

When you mix sugar and water, the sugar is the __________

Solute
400

Why are the molecules on top of a liquid surface harder to push apart?

They are pulled in a downwards direction more strongly than the rest of the molecules (no molecules on top to pull them upwards)

400

Separating substances in a mixture by smearing them on filter paper

Paper chromotography

400

What is the common gas produced from the chemical reactions we created?

Carbon Dioxide?

400

Orange juice is a(n) _____________

Acid

500

What is one way to increase the saturation of a solution?

Increase the heat of the solvent

500

How did we test for surface tension?

Water drops on top of pennies

500

 When we collect evaporated water, we call this _____________

Simple distillation

500

What are the gases that make up our atmosphere?

Nitrogen, Oxygen, Carbon Dioxide

500

List 3 bases that we worked with in the lab

Ammonia, baking soda, liquid soap, milk