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Year 7 Particles Review
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Which two elements on the periodic table are liquids at room temperature?
Bromine and Mercury
How many atoms are there in sodium chloride?
2
The phase change from solid to liquid
melting
Name all the substances that are in the gas state at 0 C.
Krypton and Neon
Which substance has the highest melting point?
platinum
Which substance has the lowest boiling point?
neon
The reason a balloon increases in size when you put more gas molecules into it, is because the particles move more quickly and _______________ with each other and the balloon. Fill in the blank.
collide
Name at least 2 factors that affect the speed of diffusion.
Any 2 of the following: 1) Particle Size 2) Temperature 3) The state of the diffusing substance
What phase change is showing in this image?
sublimation
What state of matter takes the shape of its container?
liquid
How does the composition of particles change when they change from solid to liquid?
Trick question! They do not... the particle composition stays the same in phase changes. What does change is the physical properties.
If the melting point of substance X is 550 C, what state would it be in at 450 C?
solid
Which of the following is NOT a diatomic molecule? hydrogen, sulfur, bromine, nitrogen
sulfur
What state of matter is the flask in middle?
liquid
How many atoms are there in NaHSO3?
6
The net movement of anything from a region of higher concentration to a region of lower concentration
diffusion
The phase change from liquid to gas
boiling
Which of the following can be the most compressed? a) gas b) liquid c)solid
gas
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