Bonding and Substance Properties
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Name the interconversion that takes place when a liquid becomes a solid.
The interconversion that takes place when a liquid becomes a solid is called freezing.
What type of energy allows particles to move in the liquid state?
The type of energy that allows particles to move in the liquid state is kinetic energy.
What does the term interconversion of state mean?
Interconversion of state is the change of matter from one state to another due to changes in temperature or pressure.
True or False? Particles in a liquid move quickly in all directions.
False. Particles in a liquid have restricted movement and move around each other. Gas particles move quickly in all directions.
The melting point of a substance is 256 oC and its boiling point is 800 oC. What is its state at 80 oC?
The state of the substance at 80 oC is solid.
In the following equation what is the state of copper(II) oxide? 2HCl (aq) + CuO (s) ⟶ CuCl2 (aq) + H2O (l)
In the following equation copper(II) is in the solid state. 2HCl (aq) + CuO (s) ⟶ CuCl2 (aq) + H2O (l)
Which state of matter has particles very close together that vibrate about a fixed position?
The solid state state has particles very close together that vibrate about a fixed position.
True or False? Energy is needed to change a gas to a liquid.
False. Energy is released when a gas changes into a liquid.
True or False? The melting point and freezing point of a substance are the same.
True. There is no difference between the melting point and freezing point.
State what is meant by sublimation.
Sublimation is when a solid changes directly into a gas.
The melting point of a substance is 1240 oC and its boiling point is 1950 oC. What is its state at 100 oC?
The state of the substance at 100 oC is solid.
The melting point of a substance is 1105 oC and the boiling point is 1450 oC. What is the state at 1400 oC?
The state of a substance at 1400 oC is liquid.
What is boiling?
Boiling is when a liquid changes into a gas at a specific temperature.
True or False? The three states of matter are solids, liquids and gases.
True. The three states of matter are solids, liquids and gases.
The melting point of a substance is -215.6 oC and the boiling point is -173 oC. What is the state of the substance at -120 oC?
The state of the substance at -120 oC is gaseous.
State three limitations of particle theory.
Does not account for forces of attraction between the particles Considers all particles as spherical in shape Does not consider the size of the particles
What happens to the forces of attraction when a solid turns to a liquid?
When a solid turns to a liquid, the forces of attraction are overcome or broken.
What is melting?
Melting is when a solid changes into a liquid.
What is freezing?
Freezing is when a liquid changes into a solid.
What is evaporation?
Evaporation is when a liquid changes into a gas.
What is condensation?
Condensation is when a gas changes into a liquid, usually on cooling.
True or False? The stronger the forces between the particles, the higher the energy needed for melting and boiling to occur.
True. The stronger the forces between the particles, the higher the energy needed for melting and boiling to occur.
The boiling point of a substance is 60 oC and its melting point is -5 oC. What is its state at 40 oC?
The state of the substance at 40 oC is liquid.
The melting point of a substance is -80 oC and its boiling point is -20 oC . What is its state at 10 oC?
The state of the substance at 10 oC is gaseous.