Science Unit 5 Review/ GMASS Review

Chlorine is a green gas, while sodium is a soft, silver solid. Together they create a new substance of salt which is a white, brittle solid with other new properties. Why would this be considered a chemical change?

• Both substances increased in mass.

• A new substance is formed.

• No new substances are formed.

• Chlorine and sodium can be easily separated by a physical change

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Rod Stewart dropped apples from a tree and recorded the direction they moved. Every time he dropped an apple, it went straight down. What was he testing?

• Shapes of the Apples

• Gravity’s Push

• Chemical Changes

• Gravity’s Pull

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A sheep ate the plants above and then walked around. What is the original source of energy for the sheep?

• Sun

• Plants

• The Air

• Water

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. Darian decided to make a campfire with his parents. First, he gathered and chopped tree branches into smaller pieces of wood. Once the pieces were arranged, his father started the fire. As Darian sat roasting his marshmallows to a beautiful golden brown, he started thinking about the physical and chemical changes he just created. Which of Darian’s ideas is correct?

• Burning the wood is a physical change because it changed the size of the wood pieces.

• Roasting the marshmallow is a physical change because it changed color and gave off a different odor.

• Chopping the wood was a physical change because he changed the size of the material without changing the matter into something new.

• Chopping the wood is a chemical change because the branches are smaller.

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Tia made a glass of iced tea. She left it on her kitchen counter while she answered the phone. When she went back to pick up her glass of tea, she noticed drops of liquid on the outside of the glass. What argument can Tia make to support the statement that the liquid came from a change in the state of water?

• The ice melted and wet the outside of the glass.

• The water vapor in the air condensed to

  liquid when it touched the cold cup.

• The tea evaporated into the air.

• The tea seeped through the glass.

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Which is the BEST way to separate a mixture of iron filings, sand, gravel, and pebbles?

• Use your hands to separate each of the materials into different piles.

• Put the mixture in water, then use a magnet to remove the iron filings.

• Use a magnet to remove the iron filings, then use strainers of different sizes to separate the pebbles and gravel from the sand.

• Dissolve the sand in water and use a strainer to separate the pebbles

Shasta blew up a balloon. She measured the balloon with a piece of string. She submerged the balloon in ice water for a few minutes and then measured it again with the string. Which of the following is the best explanation of what happened?

• The balloon grew larger when the particles moving around inside of it began to expand.

• The balloon burst when the string broke the surface tension of the water.

• The balloon stayed the same because the change in temperature did not affect the particles inside it.

• The balloon grew smaller when the particles moving around inside of it slowed down and moved closer together.

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Which of the following would best dissolve in water?

• Sand

• Vegetable Oil

• Salt

• Pebbles

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Which best describes the force of gravity on a soccer ball on top of the roof of a house?

• Gravity pushes up on the soccer ball.

• Gravity pushes on the soccer ball in a west direction.

• Gravity pulls on the gravity east towards the ocean.

• Gravity pulls the soccer ball down towards the ground.

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Which of the following would have a common characteristic for most examples of being shiny, a solid, can be drawn into wires, and can be hammered into thin sheets?

• Rocks

• Metal

• Glass

• Wood