1. Liquids molecules are spaced out; do not have a definite shape.
Gas molecules are widely spaced out; do not have a definite volume.
2. The change of states are:
- Solid to liquid = melting
- Liquid to solid = freezing
- Liquid to gas = evaporation
- Gas to liquid = condensation
3. Based on the table
- methane has the lowest melting point of -182°C
- naphthalene is a solid at room temperature
- ethanol is liquid at room temperature
4. The states of matter are as follows:
- A is part solid, part liquid
- B is liquid
- C is part liquid, part gas
- D is gas
5. condensation
6. Sulfur dioxide is a gas.
7. The boiling point of the alkanes increases as the number of carbon atom in the compound increases.
8. Methane has the lowest melting point of -182°C
9. The physical state of butane at -50°C is liquid
10. The change of state is melting.
11. The change of state is condensation.
What are the shape and structure of liquids and gases?
1. Liquids molecules are spaced out from and they do not have a definite shape.
Gas molecules are widely spaced apart from each other and they do not have a definite volume.
2. The names of the processes of change of state are as follows:
Solid to liquid = melting
Liquid to solid = freezing
Liquid to gas = evaporation
Gas to liquid = condensation
3. Based on the table
- methane has the lowest melting point of -182°C
- naphthalene is a solid at room temperature because its melting point is greater than room temperature
- ethanol is liquid at room temperature because its boiling point is greater than room temperature
4. The states of matter are as follows:
- A is part solid, part liquid
- B is liquid
- C is part liquid, part gas
- D is gas
5. The change of state between A and B is condensation
6. Sulfur dioxide is a gas at -20°C because the temperature is higher than its melting point but less than its boiling point.
7. From the table of the alkanes, it can be seen that the boiling point of the alkanes increases as the number of carbon atom in the compound increases.
8. Methane has the lowest melting point of -182°C
9. The physical state of butane at -50°C is liquid because the temperature is higher than its melting point but less than its boiling point.
10. The change of state is melting.
11. The change of state is condensation.
In conclusion, change of state occurs when heat is added or removed from a substance.
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