Properties of Matter
Which statement correctly describes an atom?
A. It is the largest piece of matter
B. It is a tiny particle that makes up matter
C. It is only found in solids
D. It is a type of liquid
Answer: B. It is a tiny particle that makes up matter
A student mixes sand and water. What has been created?
A. A chemical change
B. A mixture
C. A new element
D. A single pure substance
Answer: B. A mixture
Which is an example of a physical change?
A. Wood burning
B. Iron rusting
C. Ice melting
D. Food cooking
Answer: C. Ice melting
A student combines 20 grams of sand with 30 grams of water. What should the total mass be?
A. 10 g
B. 30 g
C. 50 g
D. 60 g
Answer: C. 50 g
Which substance is most likely to be a solution?
A. Rocks and sand
B. Salt completely dissolved in water
C. Paper clips and pencils
D. Gravel and water
Answer: B. Salt completely dissolved in water
Answer: B. Salt completely dissolved in water
Which property describes how much space an object takes up?
A. Mass
B. Density
C. Volume
D. Hardness
Answer: C. Volume
In a glass of salt water, which substance is the solute?
A. Water
B. Salt
C. Glass
D. Spoon
Answer: B. Salt
Which is an example of a chemical change?
A. Cutting paper
B. Melting chocolate
C. Crushing a can
D. Rust forming on iron
Answer: D. Rust forming on iron
Substance A has a mass of 25 g and Substance B has a mass of 15 g. They are mixed together in a closed container. What should the total mass be after mixing?
A. 10 g
B. 25 g
C. 40 g
D. 50 g
Answer: C. 40 g
Which change is chemical?
A. Water freezing
B. A balloon being inflated
C. An apple rotting
D. A piece of paper being folded
Answer: C. An apple rotting
A student observes four materials. Material A is magnetic, while Materials B, C, and D are not. Which property would be most useful for separating Material A from the others?
A. Magnetism
B. Color
C. Volume
D. Temperature
Answer: A. Magnetism
Cup A contains 1 spoon of sugar and 200 mL of water. Cup B contains 4 spoons of sugar and 200 mL of water. Which cup has the greater concentration of sugar?
A. Cup A
B. Cup B
C. They have the same concentration
D. Neither is a solution
Answer: B. Cup B
A student tears a piece of paper into several smaller pieces. Why is this a physical change?
A. A new substance is formed
B. The paper's size and shape change, but it remains paper
C. The paper becomes a gas
D. The paper changes into a different material
Answer: B. The paper's size and shape change, but it remains paper
Before two substances are mixed, their combined mass is 75 grams. After mixing, which result best supports conservation of matter?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
Answer: C. 75 g
Which material would most likely sink in water?
A. An object with a density of 0.5 g/mL
B. An object with a density of 0.8 g/mL
C. An object with a density of 1.0 g/mL
D. An object with a density of 2.0 g/mL
Answer: D. An object with a density of 2.0 g/mL
A block has a density greater than the density of water. What will most likely happen when the block is placed in water?
A. It will float
B. It will sink
C. It will dissolve immediately
D. It will turn into a gas
Answer: B. It will sink
A student wants to make sugar dissolve in water faster. Which action would most likely increase the rate of dissolving?
A. Use cold water and do not stir
B. Use warm water and stir
C. Use a large piece of sugar and do not stir
D. Put the sugar in an empty cup
Answer: B. Use warm water and stir
Which observation provides the strongest evidence that a chemical change has occurred?
A. A substance changes shape
B. A substance melts
C. A new substance with different properties forms
D. A substance is moved to another container
Answer: C. A new substance with different properties forms
A student mixes 40 g of Substance A with 60 g of Substance B in a closed container. After mixing, the mixture looks completely different. Which statement is correct?
A. The matter disappeared
B. The total mass should still be 100 g
C. The mass must become 200 g
D. The heavier substance disappeared
Answer: B. The total mass should still be 100 g
A student has a mixture of sand and water. Which method would be most appropriate to separate the sand from the water?
A. Filtration
B. Magnetism
C. Freezing
D. Stirring
Answer: A. Filtration
Students need to design a small vessel that can carry several heavy marbles across water without sinking. Which design would be most useful?
A. A flat piece of solid metal
B. A sealed boat-shaped container that spreads the weight over a larger area (wide bottom, tall sides)
C. A tiny metal ball
D. A solid rock with no air space
Answer: B. A sealed boat-shaped container that spreads the weight over a larger area (wide bottom, tall sides)
A mixture contains iron filings, sand, and water. Which sequence would be most effective for separating the materials?
A. Magnet → filtration
B. Filtration → magnet → evaporation
C. Evaporation → magnet → filtration
D. Stirring → freezing
Answer: A. Magnet → filtration
An ice cube melts into liquid water. Later, the water is placed in a freezer and becomes ice again. What does this demonstrate?
A. A chemical change occurred
B. A new substance was created
C. A reversible physical change occurred
D. The water disappeared
Answer: C. A reversible physical change occurred
A class mixes two substances. Substance A has a mass of 35 g, Substance B has a mass of 45 g, and the mixture has a mass of 80 g. Which claim is best supported?
A. Matter was destroyed
B. Matter was created
C. The total mass was conserved
D. Substance A disappeared
Answer: C. The total mass was conserved
A student puts 10 g of salt and 90 g of water into a sealed container. The salt completely dissolves. Which statement is best supported?
A. The salt disappeared
B. The water destroyed the salt
C. The total mass remains 100 g
D. The mixture has a mass of 90 g
Answer: C. The total mass remains 100 g