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WorksheetsChemical Interactions: Phase Change
Total questions: 51
Worksheet time: 41mins
Melting is _______
A phase change where a gas changes into a solid.
A phase change where a liquid changes into solid.
A phase change where a solid changes into gas.
A phase change where a solid changes into a liquid.
Choose the pictures that show MELTING. (You may choose more than 1).
What causes objects to melt?
cold
heat
sound
stirring
Freezing is _______
A phase change where a gas changes into a solid.
A phase change where a liquid changes into solid.
A phase change where a solid changes into gas.
A phase change where a solid changes into a liquid.
The change of phase of matter from a liquid to a gas is called _________.
When an M&M's chocolate core melts in hot air, what is happening at the particle level?
The freezing point of water is...
100oC
0oC
-10oC
150oC
Melting requires a change in kinetic energy.
True
False
Ice cream melts when it is placed in the freezer.
True
False
A substance has a melting point of 25 oC and a boiling point of 235 oC. What state is it at 5oC?
Solid
Liquid
Gas
A substance has a melting point of -125 oC and a boiling point of -35 oC. What state is it at 15oC?
Solid
Liquid
Gas
In a glass of water, what is in the small space between any two water particles?
water particles
empty space
In its gas phase, water is called ______________
Ice
Water vapor
Hydrogen
Carbon dioxide
What happens to the particles in a cup of cold juice as it warms up to room temperature?
The space between the juice particles decreases
The size of the juice particles increases
The space between the juice particles increases
The size of the juice particles decreases
When a liquid is heated, the particles:
Move faster
Take up more space
Move slower
Take up less space
When a liquid is cooled, the particles:
Stop moving
Slow down
Speed up
Move closer together
True or false: Gold is solid at room temperature.
True
False
True or false: Hydrogen is liquid at room temperature.
True
False
Which of the following are properties of a solid?
Definite volume
Definite shape
No definite volume
No definite shape
Which of the following are properties of a liquid?
Definite volume
Definite shape
No definite volume
No definite shape
Which of the following are properties of a gas?
Definite volume
Definite shape
No definite volume
No definite shape
A student leaves a liquid solution of salt dissolved in water out on the counter. In the morning, only solid salt crystals remains. This scenario describes _________.
melting
freezing
evaporation
condensation
These tools can be used to measure a precise volume of liquid.
syringe
graduated cylinder
thermometer
timer
_____________ is the average kinetic energy in an object.
convection
temperature
heat
radiation
You accidentally pick up a hot pan with your hand. Ouch! Energy transfer from particles to particles by contact is called ____________________ .
contraction
conduction
expansion
compression
You can sit several feet away from the bonfire and still feel its warmth without having to touch it directly. This type of energy transfer is called ______________ .
conduction
thermal energy
expansion
compression
A cup of water is surrounded by air at room temperature. How could you collect evidence to determine whether this system is at equilibrium?
Measure the temperature in the air and in the water. If the temperatures are the same, then the system is at equilibrium.
Measure the temperature in the air and in the water. If the temperatures are the different, then the system is at equilibrium.
The melting/freezing point of mercury is -39ºC. A scientist put liquid mercury into a freezer that is kept at a constant temperature of -35ºC. Will the liquid mercury freeze?
Yes, because the freezer is cold enough to freeze mercury.
No, because the freezer isn’t cold enough to freeze mercury.
Explain freezing at the particle level.
Is air matter? Does it have mass and take up space?
Yes, air is matter
No, air is not matter
If a marshmallow and hot chocolate are at the same temperature, which direction will the energy flow?
From the hot chocolate to the marshmallow
From the marshmallow to the hot chocolate
Back and forth between the two objects
When air is heated in a basketball ___________. (mark all correct answers)
The air particles move faster
The air particles hit each other more frequently
The air particles get larger
The air particles get farther apart
The number of air particles increases
True or false: Dissolving is a phase change.
True
False
The substance being dissolved is called the ________
solvent
solid
solute
solvate
What is the difference between the substances represented by the symbols Si and SI ?
They both stand for the same element.
Si stand for Silicon while SI stand for Sulfur & Iodine.
Si is a chemical and SL is an element.
Si stands for silver while SO stands for Sodium.
What elements are in this substance?
Nitrogen, Hydrogen, Sulfur, Oxygen
Nitrogen, Helium, Sulfur, Oxygen
Nitrogen-Hydrate, Sulfur, Oxygen
Nitrogen, Hydrogen, Silver, Oxygen
What elements are in this substance?
Silver, Iodine
Silver, Iodide
Gold, Iodine
Gold, Iodide
What information on the label is the chemical formula?
Calcium carbonate
Chalk
CaCO3
What happens to air particles in a closed syringe system when you push on the plunger?
The air particles compress, or get closer together
The air particles expand, or spread out
What happens to air particles in a closed syringe system when you pull on the plunger?
The air particles compress, or get closer together
The air particles expand, or spread out
When the particles of a substance are broken down and evenly distributed within another substance, it is called ________.
Which of the following can be compressed?
a gas
a liquid
a solid
Which is something you could do to cause the volume of this balloon to decrease?
heat it
cool it
When two or more materials are put together, you have a mixture. Choose your favorite type of food mixture.
Cheese and bread
Pasta and sauce
Chocolate and peanut butter
Blueberry and raspberry
Particles collide ________ of times in a single second!
hundreds
thousands
millions
billions
If you are preparing a batch of Jell-o using a powdered mix, which is the solvent?
The box is the solvent.
The powder is the solvent.
The water is the solvent.
The chef is the solvent.
If you are preparing a batch of Jell-o using a powdered mix, which is the solute?
The box is the solute.
The powder is the solute.
The water is the solute.
The chef is the solute.
