Structure of Matter
When water is a gas, it is invisible. The water can become visible if
A. it forms a cloud.
B. it changes into a liquid.
C. it changes into a solid
D. all of these
D. all of these
Anthony has some pieces of broken wax crayons. His mom helped him put the crayon pieces into a machine that melts them and forms the melted wax into crayon shapes. When the wax cools, it makes new crayons. What must be true about the wax?
A. Solid wax can only be shaped like a crayon.
B. When wax is melted, it changes color.
C. Melted wax cannot be made solid again.
D. Melting wax is a reversible change.
D. Melting wax is a reversible change.
A wool scarf is unraveled to a long piece of wool. The wool looks different because its _______ has changed.
A. color
B. texture
C. shape
D. weight
C. shape
Cassie has a magnet that she holds over an iron nail. The nail moves toward the magnet before the magnet touches it. Which of the following is true about magnetism?
A. Magnetism is a force that acts at a distance and cannot be seen.
B. Magnetism is a force that can be seen in the air as it moves an object.
C. Magnetism is not a force, and therefore it cannot move an object.
D. Magnetism is a force that must directly touch an object in order to move it.
A. Magnetism is a force that acts at a distance and cannot be seen.
A ball is thrown in the air. The ball goes up, then changes direction and falls down. Why does the ball fall down?
A. Gravity stops working.
B. Gravity pulls it down.
C. Gravity pushes the Earth up.
D. Gravity makes the ball lighter.
B. Gravity pulls it down.
What kind of matter expands to fill the container it is in?
A. solid
B. gas
C. powder
D. liquid
B. gas
Which of these changes cannot be reversed?
A. Water turns to ice when it is put in the freezer.
B. A hot oven cools when the power is turned off.
C. Butter melts when it is left in the sunlight.
D. Onions turn brown when they are cooked in a pan.
D. Onions turn brown when they are cooked in a pan.
A sheet of aluminum foil is torn into small pieces. Which feature of the aluminum foil has changed?
A. luster
B. state
C. color
D. shape
D. shape
Haley rubs a balloon against her head. Her hair becomes positively charged. The balloon becomes negatively charged. If she moves the balloon away from her head, her hair will most likely
A. be attracted by the balloon and follow it.
B. be damaged by the balloon and fall out.
C. not be affected by the balloon in any way.
D. be pushed away by the balloon and move away from it.
A. be attracted by the balloon and follow it.
Morgan throws a paper airplane. How will gravity make the airplane move?
A. up toward the sky
B. down toward the ground
C. back toward Morgan
D. in a straight line
B. down toward the ground
Jade is in her bedroom. She can smell food that is being cooked in the kitchen. Why can Jade smell food that is in another room?
A. There are no particles in air, so it easy for smells to travel.
B. Gases are made of particles that move around freely in space.
C. There is not any matter in air, so smells stay in place.
D. Gases are made of matter that stays in one place.
B. Gases are made of particles that move around freely in space.
Kayla leaves a cup of water outside for several days in the winter. Every night, the water in the cup freezes. Every day, after the Sun comes up, the water in the cup melts again. What must be true about water?
A. Freezing and melting water are both reversible.
B. Freezing water is reversible, but melting it is not.
C. Melting water is reversible, but freezing it is not.
D. Neither freezing nor melting water is reversible
A. Freezing and melting water are both reversible.
What would be the best way to distinguish a glass jar from a plastic bottle?
A. The glass jar will always be larger.
B. The plastic bottle will always be cleaner.
C. Glass is hard while plastic is flexible.
D. Plastic is a different color from glass.
C. Glass is hard while plastic is flexible.
Dalila has a toy car with a magnet glued on it. She takes another magnet and moves it closer to the toy car. Before the magnet touches the toy car, the toy car starts moving. Then, it moves faster. How did the magnet change the car's motion?
A. The magnet created new energy when it hit the toy car.
B. The magnet transferred its energy of motion to the toy car.
C. There was energy stored in the magnetic field of the magnet.
D. There was energy stored in the electric current of the magnet
C. There was energy stored in the magnetic field of the magnet.
Children in the school yard observe leaves falling to the ground in autumn. What causes the leaves to land on the ground?
A. magnetism
B. evaporation
C. gravity
D. birds
C. gravity
Which of the following is true of the composition of all materials?
A. All materials are made up of living cells.
B. All materials are made up of only one part.
C. All materials are made up of smaller parts that cannot be seen without magnification.
D. All materials are made up of large parts that can only be seen by the human eye.
C. All materials are made up of smaller parts that cannot be seen without magnification.
Which of the following is an example of a change that is reversible?
A. a slice of bread toasting when it is heated
B. an egg becoming hard when it is heated
C. a chocolate bar melting when it is heated
D. cake mix becoming solid when it is heated
C. a chocolate bar melting when it is heated
Which two things could be sorted into a group of things that feel rough?
A. concrete and nail file
B. hat and spoon
C. spoon and nail file
D. concrete and spoon
A. concrete and nail file
Lucas was using a magnet in an experiment. He put a paper clip and rubber ball on the floor. When he held the magnet above the paper clip, he could pick up the paper clip with the magnet. When he held the magnet above the rubber ball, the rubber ball did not move. How can Lucas know that the magnet has energy?
A. Lucas was using the magnet in an experiment.
B. The paper clip and rubber ball were below the magnet.
C. The rubber ball did not move when the magnet was above it.
D. The magnet was able to pick up the paper clip.
D. The magnet was able to pick up the paper clip.
Kendra is hanging from the monkey bars on the playground. It gets harder and harder for Kendra to hold on. Then she falls to the ground. What force causes her to fall?
A. gravity
B. friction
C. magnetic
D. push
A. gravity
The air in Earth's atmosphere is made of matter. This means that air
A. is a liquid.
B. does not take up space.
C. has mass.
D. cannot change state
C. has mass.
One cold night, the leaves on a tree freeze. This makes the leaves die and fall off the tree. What is true about the change to the leaves?
A. Leaves can fall off the tree and continue to help the tree.
B. Leaves can freeze and melt and there will be no change to the leaves.
C. When leaves freeze, the change cannot be undone.
D. When they freeze, the leaves on a tree will always stay frozen.
C. When leaves freeze, the change cannot be undone.
After school, Jane looks in the refrigerator for a snack. She sees a bottle of orange juice and an apple. Which property of the orange juice and the apple is the same?
A. shape
B. temperature
C. the ability to float
D. state of matter
B. temperature
Paul walks across a carpeted room in his socks. As he walks, he drags his feet along the carpet. Shortly afterward, Paul touches a doorknob and feels a "shock." What has caused the shock?
A. light particles hitting his finger and the doorknob
B. a sharp object stinging his finger
C. charged particles moving from his body to the doorknob
D. charged particles repelling each other
C. charged particles moving from his body to the doorknob
Jeremy throws his ball up in the air, but the ball falls back to the ground. What force made the ball move without ever touching the ball?
A. Jeremy's hand pushing on the ball
B. the air pressure pushing on the ball
C. gravity pulling on the ball
D. magnetism pulling on the ball
C. gravity pulling on the ball