Which statement describes an extensive property of matter?
answer
It changes with the amount of sample that is present.
question
When a strip of magnesium metal is touched by a flame, a bright light and a whitish substance are produced. Why is the burning of magnesium considered a chemical change?
answer
because a new substance is formed.
question
Which of these is an example of physical change?
answer
Solid ice, when heated, turning into water.
question
Which statement describes a chemical property of water?
answer
It reacts with sodium metal.
question
A gaseous substance turns into a solid. Which is best describing this change?
answer
A substance that has no specific volume changes to a substance that has a specific volume.
question
At what temperature is the substance a heated gas?
answer
Above 100°C.
question
Which best characterizes a crystal?
answer
A dense substance that is hard and incompressible.
question
Why do amorphous solids do not have a long-range order in the arrangement of their particles?
answer
Their formation involves very rapid cooling.
question
Which commercial technology commonly uses plasmas?
answer
A television.
question
Which is an aspect of the kinetic-molecular theory and can be used to explain the compressibility of plasmas?
answer
Particles independently of one another and are widely spaced.
question
When the process of condensation occurs, the kinetic energy of particles...
answer
is insignificant to overcome intermolecular forces.
question
Which statement *best* compares the melting point of butane (C4H10) with that of octane (C8H18)?
answer
The melting point is higher for the substance that has stronger intermolecular forces.
question
Which is a postulate of the kinetic-molecular theory?
answer
Gas particles have a small volume relative to the spaces between them.
question
Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular theory?
answer
Smaller volumer --> crowded particles--> more collisions --> higher pressure.
question
If both gasses are the same temperature, which one has the greater pressure?
answer
Gas 2 because it has more particles that are colliding.
question
Which statement describes a limitation of the kinetic-molecular theory for a gas?
answer
The theory assumes that particles do not experience intermolecular forces.
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