Intro to Matter Practice Test Answers
1) B
2)A
3)b
4) b
5)b
6)d
7)c
8)b
9)b
10)c
15)d
16)b
17)c
18)d
19) omit
20)a
21)c
22)c
23)c
Free Response
1) pictures – solid has particles all closely together, liquids have them further apart, and gases are very far apart
2) Because air particles are always moving randomly, and they collide with eachother and the walls of their containers, when you add more air particles by blowing into the balloon, they hit the balloon wall more often and more of them do it — causing the balloon to expand.
3)A physical change does not alter the chemical make up of matter – like tearing a piece of paper — the paper is still chemically the same, but differs in only size. A chemical change is when some new kind of matter is made — the atoms are rearranged into a matter — an example is when iron rusts — the iron reacts with oxygen to make rust, a new substance.
4) 300g (law of conservation of mass — must have the same mass before and after a change)
5) A mixture is when two substances are combined. Mixtures can be separated using physical properties — for example if you had a mixture of poppy seeds and sand one could separate that by adding water — the poppy seeds will float and the sand sinks. You could then remove the poppy seeds with a strainer, and filter the sand out of the water with a funnel and filter paper.
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