Physical and Chemical Changes
Which of these is an example of a physical change of matter?
A. egg frying
B. ice melting
C. iron rusting
D. paper burning
B. Ice Melting
How long does it take the moon to make a complete revolution around the earth?
A. 365 days
B. 1 week
C. 29 days
D. 52 weeks
C. 29 days
It is important to use recycled paper because it
A. comes in colors.
B. has a smoother appearance.
C. creates less pollution.
D. reduces the number of trees cut down.
D. Reduces the number of trees cut down.
A bowling ball knocking pins down
Contact
Which of the following materials is released into the atmosphere by a plant during photosynthesis?
A. oxygen
B. nitrogen
C. water vapor
D. carbon dioxide
A. oxygen
Which action demonstrates a chemical change?
A. Long hair is cut and dried.
B. A wooden pencil is sharpened and breaks.
C. An ice cube melts and becomes a clear liquid.
D. An iron nail becomes orange and flaky on the surface
D. An iron nail becomes orange and flaky on the surface
How long does it take the Earth to make one revolution around the sun?
A. 24 hours
B. 365 days
C. 29 days
D. 52 weeks
B. 365 days
Communities can work together to develop ways to conserve natural resources. Which two statements describe a way that humans can protect natural resources?
A. Add more lanes to a major highway to make travel faster.
B. Develop public transportation systems to reduce fuel use.
C. Approve a bottling plant so that fresh water can be shipped easily.
D. Build landfills for waste disposal to reduce the amount of trash along roads.
E. Establish a community composting program to recycle food waste and other materials.
B. Develop public transportation systems to reduce fuel use.
E. Establish a community composting program to recycle food waste and other materials.
Is the following force contact or noncontact?
A person pulls a small child in a wagon
Contact
What are the products of photosynthesis?
A. oxygen, water, sunlight
B. carbon dioxide, glucose
C. glucose, oxygen
D. carbon dioxide, sunlight, water
C. glucose, oxygen
A student placed an egg in a container of vinegar. Bubbles formed on the shell of the egg, and after three days, the shell was gone. Which observation made by the student indicated a chemical change took place?
A. The bubbles were produced as the shell reacted with the acid.
B. The vinegar solution remained clear.
C. The temperature of the vinegar remained the same.
D. The shape of the egg remained oval.
A. The bubbles were produced as the shell reacted with the acid.
Which of the following are two main factors that result in the Earth’s seasonal changes?
A. The Earth’s distance to the Sun and gravitational forces of the Moon.
B. The Earth’s tilt on its axis and its orbit around the Sun.
C. The Earth’s elevation and the Moon orbit around the Earth.
D. The Earth’s ozone layer and its large oceans.
B. The Earth’s tilt on its axis and its orbit around the Sun.
When motor oil is replaced in a car, the old oil is dirty and must be disposed of. Which method of disposing of dirty motor oil would be part of a plan to conserve natural resources?
A. Store the oil in bottles so that it is not polluting.
B. Recycle the oil so that it can be cleaned and used again.
C. Burn the oil so that it does not pollute ground or water systems.
D. Pour the oil onto the ground so that soil filters it and it can be pumped out again.
B. Recycle the oil so that it can be cleaned and used again.
Is the following force contact or noncontact?
A magnet attracts a steel nail
What are the reactants of photosynthesis?
A. oxygen, water, sunlight
B. oxygen, glucose
C. carbon dioxide, oxygen
D. carbon dioxide, sunlight, water
D. carbon dioxide, sunlight, water
Which changes are evidence of both chemical and physical changes?
A. Breaking into smaller pieces, color changes
B. Forming bubbles, color changes
B. Forming bubbles, color changes
Copernicus had his theory about the design of our solar system supported by the personal observations conducted by Galileo. Unlike Aristotle and Ptolemy, Copernicus’s theory suggested that ____________________.
A. The moon orbited Earth as did most of the other planets except Mercury and Venus.
B. The planets orbited the Sun.
C. The Earth was orbited by the other planets.
D. The stars and other heavenly bodies revolved around the Earth.
B. The planets orbited the Sun.
Which activity would help protect the natural habitats of animals?
A. building an apartment complex
B. allowing fishing in more rivers
C. creating a zoo for endangered species
D. limiting construction in wooded areas
D. Limiting construction in wooded areas
When an airplane is flying at a constant speed and direction, [CHOICE 1] forces are acting on it.
A. Balanced
B. Unbalanced
A. Balanced
How do plants grow in the aquarium without sunlight or air?
A. Underwater plants do not need light or oxygen because they are different from land plants.
B. Plants can use light from a lightbulb and oxygen that is dissolved in water to grow underwater.
C. Underwater plants do not need light, and they are able to make the oxygen that they need to grow.
D. Plants can get light from a lightbulb, but they do not need oxygen because they grow underwater.
B. Plants can use light from a lightbulb and oxygen that is dissolved in water to grow underwater.
When an ice cube melts, it forms liquid water.
Which statement correctly describes this process?
A. The process is a chemical change that cannot be reversed because water is a different substance than ice.
B. The process is a chemical change that can be reversed because water is a new substance that can be changed back to ice.
C. The process is a physical change that cannot be reversed because the water has a different shape than the ice cube that melted.
D. The process is a physical change that can be reversed because the water can be changed back to ice and no new substance is formed.
D. The process is a physical change that can be reversed because the water can be changed back to ice and no new substance is formed.
For thousands of years, sailors have needed ways to find their location in the ocean. What are two ways sailors could find out the direction in which they are traveling in the ocean far from land?
A. the position of a compass needle
B. the direction of motion of water waves
C. the location of the North Star in the night sky
D. the information written on a map of the ocean
E. the color of the ocean water at different times of day
A. the position of a compass needle
C. the location of the North Star in the night sky
Automobile engines built today are designed to be gas efficient. Gas-efficient engines MOST likely affect a city by reducing
A. air pollution.
B. heat pollution.
C. noise pollution.
D. light pollution.
A. Air pollution
What forces act on a ball after a person throws it?
A. Gravity pulls the ball downward starting at the beginning of its motion.
B. The force from the throw pushes it forward and gravity pulls it downward.
C. Gravity begins to pull the ball downward when it reaches the top of its path.
D. The force of the throw pushes it upward until gravity starts pulling it downward.
A. Gravity pulls the ball downward starting at the beginning of its motion.
Tamara planted two plants in identical pots. She covered one plant with a black bucket and left one plant uncovered. Tamara thinks the covered plant will die. Why would covering this plant with a dark bucket MOST likely cause it to die?
A. because the plant needs a lot of room to grow
B. because the plant needs sunlight for photosynthesis
C. because the bucket keeps the plant from getting enough oxygen
D. because the bucket keeps the plant from absorbing water through the roots
B. because the plant needs sunlight for photosynthesis