Chapter 11 Changes In Matter
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physical change
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a change that makes matter look different without becoming a new substance/a new kind of matter
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states of matter
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the forms of matter-solid, liquid, and gas
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mixture
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two or more kinds of matter that are placed together
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solution
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a mixture in which one or more substances dissolves in another
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Describe a physical change in matter and explain why it is a physical change
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a physical change in matter happens when it changes the way it looks, or size, or weight, or color, or position, or state (solid, liquid, or gas) without becoming a new kind of matter, the changes may make the matter/substance look different but the matter/substance is still the same, example bits of rock and the mountain
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List ways you can make physical changes in matter
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physical properties such as size, weight, color, and position, changes in a matter's state, cutting matter into pieces, folding, or tearing.
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What physical changes happen to water as it freezes
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changes state from liquid water to a solid, ice. Liquid water changes its state when it is cooled, the particles of liquid water slide past one another when water is above O*C (32*F). At O*C, liquid water changes to solid ice. Each water particle slows down and vibrates very fast in place.
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Give three reasons why a bowl of different kinds of beans is a mixture
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there can be any amount of each kind of bean, each kind of bean does not change into another kind of bean, and each kind of bean can be separated from the mixture
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What makes ocean water a mixture
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it is made of two kinds of matter salt and water, and it can be separated
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What makes ocean water a solution
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it is a solution when the salt is dissolved in the water, some of the substances can not be seen and do not settle out
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How do you know that burning wood is a chemical change
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when wood is burned, it is changed into other kinds of substances, it is no longer wood and can't be turned back into wood
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If you paint an iron door the color of iron rust, is that a physical or chemical change
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physical change
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If the bread you are baking turns the color of rust on top, is that a physical or chemical change
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chemical change
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Name four ways chemical changes are useful
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getting energy from food, cleaning clothes, making electricity, cooking
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Does using a battery cause a physical change or a chemical change
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a chemical change because new matter is made inside the battery
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Name three examples of a physical change
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water freezing, tearing paper, cutting fruit
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Name the three states of matter
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solid, liquid, and gas
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Temperature that water freezes
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0 C (32 F)
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Temperature when water evaporates (turns to a gas)
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100 C (212 F)
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Two examples of mixtures
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jar full of different kinds of coins, a salad
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Two examples of solutions
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lemonade, salt water
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How can you separate a mixture of marbles and sand
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pour it into a strainer, the sand will fall through and the marbles will stay
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How can you separate parts of a solution
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heat salt water to make the water evaporate and leave only the salt behind
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chemical change
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when one kind of matter changes into a different kind of matter
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Examples of chemical change
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baking bread, burning wood, cooking eggs, burning gasoline in cars, using batteries, washing with soap
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Why is chopping wood a physical change, but burning wood is a chemical change
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chopped wood remains wood, but burning wood changes it into different substances
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Three ways to cause a physical change
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cutting, crushing, bending, heating, and cooling
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How can a puddle of water be on a sidewalk one day and gone the next
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the water evaporates
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What would you have if you mixed sugar and water
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a solution
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What will happen if you leave a bowl of water outside overnight at a temperature of -3 C
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the water will freeze and turn to ice
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Does frying produce a physical or a chemical change
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a chemical change, the fried egg is a different kind of matter, it can't be turned back into a raw egg
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What change takes place when sugar is heated for a long time
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a chemical change, the sugar changes to a different kind of matter and cannot be changed back to sugar
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Put these steps in the correct order: ashes, paper, burning paper
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paper - burning paper - ashes
