Unit 1 Chemical Changes Review

what is the definition of chemical change?

• any change that results in the formation of new chemical substances. 
• changing clothes
• matter cannot be created or destroyed, only change form
• changes affecting the form of a chemical substance, but not its chemical composition.

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Baking a cake by mixing flour, sugar, chocolate powder, eggs, and milk, and then heating them in the oven.

• Chemical Change
• Physical Change

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When baking soda and vinegar mix it creates a bubbly mess. Is this a chemical or physical change?

• Physical
• Chemical

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Is salt dissolving in water a physical or chemical change?

• Physical
• Chemical

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Compounds are formed when two or more ________ join together.

• blocks

• books

• atoms

• sizes

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Marie had a beaker with a small amount of baking soda. She added a few drops of pickle juice to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Marie determine about the new substance formed by mixing the baking soda and pickle juice?

• A chemical reaction produced a solid.
• A chemical reaction produced a gas.
• No chemical reaction took place.
• Only a physical change happened.

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One of the signs of a chemical reaction taking place is:

• Bubbles are produced 
• Reactants are not combining
• Products are not forming
• Color is not changing

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Which is NOT an indication of a chemical change?

• temperature change
• formation of a precipitate
• shape change
• production of light

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You know you a chemical reaction has occurred if 

• there is a precipitate.
• there is a color change.
• there is a temperature change.
• All of these answers are evidence.

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The Best Friend's Club uses "invisible ink" to write notes to each other. The invisible ink is actually lemon juice that is clear when it dries on paper, but turns brown when a club member holds a burning candle under the paper. Once it is heated, it is never invisible again.
 What type of change is occurring when the paper is heated?

• chemical change
• elemental change
• physical change
• temperature change

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