Practice exam questions- Chemistry Flashcards
Get ready for those chem tests!
Write the name of the state of matter that has: particles that are spread out the most?
Gas
Write the name of the state of matter that has: Particles that are NOT free to move.
Solid
Write the name of the state of matter that has: Particles that move through the whole of their container.
Gas
Fill in the sentences:
The change of a substance from a liquid to a solid is called ______
Freezing
Fill in the sentences:
The change of a substance from a liquid to a gas is called ______
Evaporation
Fill in the sentences:
The change of a substance from a solid to a liquid is called ______
Melting
Fill in the sentences:
When a solid melts, the surroundings transfer energy to the solid so it’s particles vibrate _____
Faster
Fill in the sentences:
When a liquid freezes, it’s particles move more ______ as they transfer energy to the surroundings.
Slowly
Fill in the sentences:
In liquids and gases, particles spread out through the process of ______.
Diffusion
What does a thermometer measure?
Measures the temperature of the air.
What does a stop watch measure?
Measures the time for the experiment.
What do weighing scales measure?
Measure the mass of something.
What does a ruler measure?
Measures the length of a plant.
In what unit would a stop clock measure?
Seconds, minutes or days.
In what unit would a thermometer measure?
Degrees Celsius or Fahrenheit.
In what unit would a ruler measure?
Mm or cm
In what unit would a weighing scale measure?
Grams (g)
What is gallium’s melting point?
30 degrees C
What is gold’s melting point?
1063 degrees C
What is oxygen’s melting point?
-218 degrees C
What is water’s melting point?
0 degrees C
Name the state of matter that diffusion happens the fastest in.
Gas
Describe what happens during the process of dissolving. 2 marks
The particles can move freely therefore the particles of the solute diffuse and make a solution with the solvent.
Suggest what happens to the rate of dissolving at low temperatures. 1 mark
It will happen slower because there will be less energy in the particles.
Give an example of an independent variable.
Mass of salt dissolved in water.
Give an example of a dependant variable.
The boiling point of a salt solution.
Give the definition of an independent variable.
In an experiment, the independent variable is the thing that is changed or is measured.
