Changing State Flashcards
Bonding, Structure, and Properties of Matter (18 cards)
What is a physical change?
A change that doesn’t change the particles, just their arrangement or energy.
What happens to particles when a solid is heated?
The particles gain more energy and vibrate more.
What is the melting point?
A certain temperature where particles have enough energy to break free from their positions.
What is melting?
The process where a solid turns into a liquid.
What is freezing?
The process where a liquid becomes a solid.
What occurs when a liquid cools?
Particles have less energy and move around less.
What happens to particles when a liquid is heated?
The particles gain more energy and move faster.
What is boiling?
The process where a liquid turns into a gas.
What is condensing?
The process where a gas becomes a liquid.
What is the boiling point?
A certain temperature where particles have enough energy to break bonds and become gas.
What happens to gas particles when they cool?
They no longer have enough energy to break their bonds.
What determines the amount of energy needed for a substance to change state?
The strength of the forces between particles.
How does the strength of forces between particles affect melting and boiling points?
Stronger forces require more energy to break, resulting in higher melting and boiling points.
How can you predict the state of a substance at a certain temperature?
If the temperature is below the melting point, it is a solid; above the boiling point, it is a gas; in between, it is a liquid.
At what temperature is bromine a liquid?
At room temperature (25°C), bromine is a liquid.
Which of the following is a gas at room temperature: oxygen, nitrogen, or bromine?
Oxygen and nitrogen are gases at room temperature.
Fill in the blank: If the temperature is below the melting point of a substance, it will be a _______.
solid
Fill in the blank: If the temperature is above the boiling point of a substance, it will be a _______.
gas
