1) Which action causes a chemical change? a) leaves falling from a tree b) leaves blowing in the wind c) leaves being burned in a fire d) leaves being crushed into pieces 2) Campers burned logs in a campfire. How would the campers know that a chemical change has taken place? a) the logs changed shape b) the rocks glowed when heated c) the wood became a different substance d) the ground absorbed heat from the coals 3) Mrs. Ellis's class mixed some materials. They made a table of the materials and the products after the materials combined. Based on the table, which materials mixed to form a new substance? a) water and flour b) water and salt c) iodine and flour d) iodine and salt 4) Over time, iron becomes rust when it combines with water and oxygen. Which type of change must occur for rust to form? a) chemical b) mechanical c) nuclear d) physical 5) Which describes a chemical change? a) sugar dissolving in tea b) sunshine warning a sidewalk c) scissors cutting paper into pieces d) acid in the stomach digesting food 6) Anna is doing a science experiment. She mixes 1 cup of hot water with 2 cups of salt. What will MOST LIKELY happen to the substance? a) the water and salt will blend, and their properties will be changed b) the water and salt will blend, but their properties will be unchanged c) the water and salt will not blend, but their properties will be changed. 7) Water is boiled and turns to vapor. The vapor is cooled and changes back into water. Which BEST describes what has occurred? a) a physical change, because the matter changed its state b) a chemical change, because the matter changed its state c) a physical change, because a new substance was formed d) a chemical change, because a new substance was formed 8) Which example BEST describes a physical change? a) baking a pie b) burning a candle c) making a paper airplane 9) A glass of water is placed outside during a hot day. After a few hours, someone notices there is less water in the glass? Which BEST explains why this happened? a) water melted, gas formed b) water evaporated, gas formed c) water evaporated, liquid formed 10) Brad accidentally left his crayon box in the car on a hot day. Which BEST explains what happened to his crayons? a) crayons melted, changed from solid to liquid b) crayons melted, changed from liquid to solid c) crayons evaporated, changed from liquid to solid 11) Which is the BEST example of a change that can be undone? a) clay put in an oven to harden b) cake batter put in an oven to bake c) chocolate left in a warm car to melt 12) Which BEST describes why deflating the air from a basketball is an example of a physical change? a) the basketball's shape is changed b) the basketball's color is changed c) the basketball's size is changed 13) Principal Green walked outside to replace the school's flag. When he took down the old flag, he noticed it had been damaged by the sun. How had it MOST LIKELY been changed? a) the flag was larger b) the flag was smaller c) the flag's colors were brighter d) the flag's colors were dull and faded 14) A glass of salt water is put on a windowsill. After several days the water has disappeared, and there is only a film of white crystals left in the bottom. Which BEST explains what has happened? a) the salt caused the water to dry up b) the water evaporated and left the salt behind c) the water and the salt evaporated and left a film behind 15) Which is an example of a chemical change? a) melting ice to make water b) baking cake batter to make a cake c) putting cheese on bread to make a cheese sandwich 16) Which example BEST describes a physical change? a) iron rusting b) charcoal burning c) an ice cube melting d) a marshmallow burning 17) A piece of wood is sawed into several small pieces. This is an example of what kind of change? a) physical b) chemical c) electrical d) mechanical 18) Which type of change occurs when the size, shape, appearance, or volume of a substance is changed without changing its composition? a) physical b) chemical c) radiation d) nuclear 19) A family member goes camping and creates a fire to roast marshmallows. The next morning, the kids notice that the logs are no longer there, and all that remains are ashes. Which BEST explains why the ashes from a log are evidence of a chemical change? a) the color of the wood changed from brown to gray b) the wood breaks down into smaller matter when burned c) the ashes cannot be put back together to create a log again d) something was added to the log, and it cannot be removed 20) Which BEST explains why burning wood is a chemical change? a) the process occurs quickly b) the process can be reversed c) the process can be repeated d) the process creates a new substance 21) Which example BEST describes a chemical change? a) wax melting b) an apple turning brown c) a piece of paper being cut into small pieces 22) Jennifer left her bike outside, buried in the snow. In the spring, when the snow melted, she found her bike covered in rust. Which BEST describes the change to the bike? a) it was a chemical change, because the bike was a different color b) it was a chemical change, because the rubber tires were deflated c) it was a chemical change, because rust can be removed from the metal d) it was a chemical change, because rust is a new substance on the metal 23) Examine the diagram below. What would a teacher MOST LIKELY use this image to explain? a) heat being added and taken away is causing physical changes in water b) air being added and taken away is causing physical changes in water c) heat being added an taken away is causing chemical changes in water d) air being added and taken away is causing chemical changes in water 24) Which BEST describes what happens when water condenses on a glass? a) a physical change occurs, because the water changes form b) a physical change occurs, because the water changes color c) a chemical change occurs, because the water gives off light d) a chemical change occurs, because the water forms a new substance 25) Tonya observes a mixture of two clear liquids in a container to see if a chemical change occurs. Which observation demonstrates the mixture is undergoing a chemical change? a) the mixture remains at a constant temperature b) a gas forms after the liquids are mixed c) one liquid floats on top of the other d) the mixture does not change color

Physical and Chemical Changes

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