Grade 9 Chemistry Review

Periodic Table

100

These vertical columns have similar properties

Groups

200

Group 1 elements that are highly reactive, soft and have 1 valence electron

Alkali Metals

300

What element is in group 13, period 4

Gallium (Ga)

400

Group 18 elements that don't react

Noble Gases

500

The staircase separates these three types of elements

Metals, Non-metals and Metalloids

Atomic Structure

100

Who discovered the nucleus with the gold foil experiment?

Rutherford

200

What are the positive and neutral particles in the nucleus called?

Protons and Neutrons

300

A neutral atom has equal number of these two subatomic particles

Protons and Electrons

400

The first orbit/ shell holds this many electrons maximum

2 e^-

500

Draw the Lewis dot structure for magnesium ion 

[Mg²⁺] 10 electrons

Ions & Bonding

100

Metals lose electrons to form these positive ions

Cations

200

Non-metals form these negative ions

Anions

300

What is the bond called in a molecular compound?

Covalent Bond

400

Metals + Non-metals = this type of compound

Ionic

500

Which has a covalent bond?

SnO₂

Sc₂O₃

SeO₂

SeO₂

Compound Naming

100

Change non-metal ending to this for ionic compounds

-ide

200

Prefixes used only for these compounds

Molecular

300

Name PCl₃

Phosphorus trichloride

400

Formula of carbon dioxide

CO₂

500

Write the formulas for carbon tetrahydride and aluminum trichloride

CH_{4 ,} AlCl₃

Calculations

100

5 clues for chemical changes are?

1. Colour

2. Gas

3. Precipitate

4. Temperature Change

5. Odour

200

Mass 75g, Volume 15cm³ What is the density?

5g/cm³

300

How many sulfur atoms in Al₂(SO₄)₃

3

400

Count all atoms in Ca₃(PO₄)₂

Ca = 3, P = 2, O=8

Total = 13

500

Is baking a cake physical or chemical change? Why?

Chemical change, new substance is formed using heat