Density
States of Matter
MAGNETS & FORCES
MIXTURES & SEPARATION
PHYSICAL PROPERTIES
100
Which substance will float on water: sand, oil, or a small piece of rock? (Answer in one word.)
- 100: oil (or rock? — expected: oil floats so answer: oil).
100
Which state of matter has particles packed closely in a regular arrangement? (solid, liquid, or gas)
- 100: solid.
100
100: Which classroom item will a magnet attract: paperclip, plastic straw, wooden pencil, or glass bottle?
Answer: Paperclip
100
100: Is a bowl of cereal and raisins a mixture or a solution?
Answer: Mixture
100
100: Which physical property tells how hot or cold something is?
Answer: Temperature
200
Look at a cup with oil on top and water below. Which layer is more dense, oil or water?
200: water is more dense than oil.
200
Identify the state: The air inside a balloon—solid, liquid, or gas?
Answer: Gas
200
200: A magnet attracts pins and nails but not plastic. What property do the pins and nails have?
Answer: They are made of magnetic metal.
200
200: Mia stirs sugar into warm water until she cannot see it. Is this a mixture or a solution?
Answer: Solution
200
200: Water is frozen in a birdbath. Which could be the outside temperature: 33°C, 28°C, 7°C, or 0°C?
Answer: 0°C
300
True or False: A big object will always sink, and a small object will always float.
False. (Size alone does not determine whether an object sinks or floats.)
300
Which state of matter takes the shape of its container but keeps the same volume?
liquid
300
True or False: Opposite magnetic poles attract, and like poles repel.
Answer: True
300
300: A mixture contains paper clips and dry beans. What tool could separate the paper clips from the beans?
Answer: A magnet
300
300: Which tool should you use to measure an object’s mass: a ruler, thermometer, or balance?
Answer: A balance.
400
You put a cube and a small coin in water. The cube is larger but the coin sinks. Explain why the coin sank even though it looked smaller.
Coing is denser than cube; even small coin has more mass per volume.
400
States of Matter 400: What change of state happens when water droplets form on the outside of a cold cup?
Answer: Condensation—water vapor changes from a gas to a liquid.
400
400: Two toy train cars need to stay together using magnets. Should opposite poles or like poles face each other? Explain.
Answer: Opposite poles should face each other because they attract.
400
400: When two substances are combined to make a mixture, do they keep their own physical properties? Explain.
Answer: Yes. Each substance keeps its own physical properties.
400
Physical Properties 400: Which substance is soluble in water: salt, sand, or gravel?
Answer: Salt.
500
Which item has the highest density: water, sand, oil, or cannot be determined? Explain your choice in one sentence.
Sand (A). Sand sinks meaning it is more dense than water; oil floats so oil is least dense.
500
500: After a wet lawn dries in the sunshine, where did the water go? Explain what state of matter it became.
Answer: The water evaporated into the air and became an invisible gas called water vapor.
500
500: A student predicts that a magnet will attract glass, nails, and every coin. What is incorrect about the prediction?
Answer: Glass is not magnetic, and not every coin is made from magnetic metal. A steel nail is attracted to a magnet.
500
500: Ava mixes 25 grams of cereal with 10 grams of raisins. What should the total mass of the mixture be? Explain.
Answer: 35 grams. The total mass equals the combined mass of all the parts.
500
500: A student wants to compare the temperatures of water in the sun and water in the shade. Describe an investigation the student could conduct.
Answer: Place one cup of water in the sun and another in the shade. After the same amount of time, measure both with a thermometer and compare the temperatures.