Year 9 Chemistry

Atoms

100

What is the charge of a proton?

positive

200

What element is Rb?

Rubidium 

300

Write the electronic configuration for Zn.

2, 8, 18, 2

400

How many electrons does a Calcium atom have?

20 electrons

500

What is the number of neutrons does a bromine atom have?

45 neutrons

Ions

100

How does a neutral atom become an ion?

by gaining or losing electrons

200

What are ions called if they are:

- positively charged

- negatively charged

cation and anion 

300

If a phosphorous atom gains 3 electrons to fulfil the valence shell, what is the charge of the ion it becomes?

-3

400

Show a carbonate ion

CO₃^2-

500

Explain what the difference is between a monoatomic ion and a polyatomic ion.

Monoatomic ion- charged atom made up of one type of element

Polyatomic ion- charged group of atoms made up of multiple type of different elements

Write the chemical formula

100

Sodium chloride

NaCl

200

Barium chloride

BaCl₂

300

Potassium sulfate

K₂SO₄

400

Aluminium hydroxide

Al(OH)₃

500

Iron (II) Nitrate

Fe(NO₃)₂

Naming compounds

100

KI

Potassium iodide

200

MgO

Magnesium oxide

300

Sr(HCO₃)₂

strontium hydrogen carbonate

400

CsSO₄

Caesium sulfate

500

Fe₂O₃

Iron (III) oxide

Law of conservation

100

T/F- Law of conservation of mass states that mass of atoms can neither be destroyed or created.

true

200

Balance this chemical equation

__ C2H6 + __O2 --> __CO2 + __H2O 

1, 3, 2, 2

300

In the burning magnesium demo, why did mass increase?

the oxygen atoms from the air reacted with the magnesium ribbon, forming MgO which created a 'heavier' product.

400

Write a balanced chemical equation for these reactants. no states required.

MgCl₂ + Na₂SO₄ -->

MgCl₂ + Na₂SO₄ --> MgSO₄ + NaCl

500

In chemical reactions, what is the product created that would result in a decrease in mass?

when a gas evolves from the reaction