5 Questions
What is the key difference between a chemical change and a physical change?
A chemical change involves the formation of a new substance and cannot be reversed, whereas a physical change only involves a rearrangement of molecules and can be easily reversed.
What is specific heat capacity, and how is it related to the change in temperature of a substance?
Specific heat capacity is the amount of energy required to raise the temperature of a material by 1°C, and it varies depending on the material.
What is the difference between latent heat of fusion and latent heat of vaporization?
Latent heat of fusion is the energy required to change the state of a substance from solid to liquid, whereas latent heat of vaporization is the energy required to change the state from liquid to gas.
Why does the mass of a substance remain constant during a physical change?
The number of particles of the substance does not change during a physical change, so the mass remains constant.
What is the relationship between the energy required to change the state of a substance and its mass?
The energy required to change the state of a substance is directly proportional to its mass.
Study Notes
Changes of State
- During a change of state, the number of particles remains the same, so the mass before and after the change is the same.
Types of Changes
- Physical change: only rearranges molecules, easy to reverse, e.g. melting.
- Chemical change: creates a new substance, cannot be reversed, e.g. cooking an egg.
Specific Heat Capacity
- The amount of energy required to raise the temperature of a material by 1°C.
- Energy = mass x specific heat capacity x temperature change (in kJ, kg, and °C).
Specific Latent Heat
- The amount of energy required to change the state of 1 kg of a substance.
- Latent heat of fusion: change of state from solid to liquid.
- Latent heat of vaporization: change of state from liquid to gas.
- Energy = mass x latent heat.
This quiz covers the concepts of thermodynamics, phase changes, and physical and chemical changes. It includes questions on melting point, condensing, and specific heat capacity.
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