C1 Atoms, Elements and Copmounds

Question 1

How many electrons does Li (Lithium)(7.0 g/mol 6.940 Da 6.9, 3) have?

Answer 1

3 electrons.

Question 2

• iodine, I2
• bromine, Br2
• chlorine, Cl2
• fluorine, F2
• oxygen, O2
• nitrogen, N2
• hydrogen, H2

Are all examples of what?

Answer 2

Diatomic Elements

Question 3

What kind of reaction is the reaction below?

Copper Sulfate + Potassium ➜ Potassium Sulfate + Copper

Answer 3

Displacement Reaction

Question 4

What kind of reactions take place in fridges?

Answer 4

Endothermic

Question 5

What charge does a proton have?

Answer 5

Positive

Question 6

A nucleus with 84 protons and 126 neutrons undergoes alpha decay. It forms lead, which has the element symbol Pb. What charge does the lead have?

Answer 6

Negative because an alpha particle is 2 neutrons and 2 protons, so it looses a charge of +2. 0 - (+2) = -2.

Question 7

The atomic number is represented by what?
- Number of protons
- Number of electrons
- Mass of the nuclei

Answer 7

Number of protons.

Question 8

Define Isotope.

Answer 8

Atoms of the same element with different numbers of neutrons.

Question 9

List 3 qualities of transition metals.

Answer 9

Any of:
- High Density
- High Solubility
- High Strength
- High Ductility
- High Malleability
- High Conductivity
- High Sonourosity

Question 10

What do catalysts do?

[3 marks]

Answer 10

1 mark per point:
- Catalysts are substances that increase the
rate of reaction
- without being used up in the reaction
- and provide an alternative pathway for the reaction to take.