Questions of unit 7.1

• Scheikunde
• Middelbare school
• havo
• Leerjaar 3

When do these substances conduct electricity?

solid and liquid state

liquid state

never

metal

salt

molecular substance

How can you experimentally, so at macrolevel, determine whether a substance is a mixture or a pure substance? (Q1a)

Explain, at micro level, the difference between a mixture and a pure substance. (Q1b)

What is, at micro level, the difference between a compound and an element. (Q1c)

Which group of substances does zinc chloride (ZnCl2) belong to? (Q2a)

1. Metals
2. Salts
3. Molecular substances

Explain at macrolevel what you based your answer to a on (Q2b)

Meaning of this safety symbol (Q2c)

1. harmful
2. harmful for the environment
3. corrosive
4. poisonous

Meaning of this safety symbol (Q2c)

1. harmful
2. harmful for the environment
3. corrosive
4. poisonous

Meaning of this safety symbol (Q2c)

1. harmful
2. harmful for the environment
3. corrosive
4. poisonous

What is the purpose of H-sentences? (Q2d)

1. Hesitation
2. Harmful
3. Hazard
4. Health

What is the purpose of P-sentences? (Q2f)

1. Precision
2. Prevention
3. Purpose
4. Position

How can you tell if a substance is a metal, salt or molecular substance? (without experiment)

Water (H2O) is a

1. metal
2. salt
3. molecular substance

Potassium nitrate (KNO3) is a

1. metal
2. salt
3. molecular substance

Silver (Ag) is a

1. metal
2. salt
3. molecular substance

Paraffin (C24H50) is a

1. metal
2. salt
3. molecular substance

Iodine (I2) is a

1. metal
2. salt
3. molecular substance

Copper (Cu) is a

1. metal
2. salt
3. molecular substance

Table salt (NaCl) is a

1. metal
2. salt
3. molecular substance

Carbon dioxide (CO2) is a

1. metal
2. salt
3. molecular substance

Methane (CH4) is a

1. metal
2. salt
3. molecular substance

Tin (Sn) is a

1. metal
2. salt
3. molecular substance

Ethanol (C2H5OH) is a

1. metal
2. salt
3. molecular substance

Aluminium oxide (Al2O3) is a

1. metal
2. salt
3. molecular substance

Ammonia (NH3) is a

1. metal
2. salt
3. molecular substance

Barium (Ba) is a

1. metal
2. salt
3. molecular substance