Reading 6.1 Quiz: What Is a Chemical Reaction

Do you think the ingredients changing into a cake in the oven are a chemical reaction? Choose the correct answer with the BEST explanation.

• Yes, because you mix stuff together and bake them.

• Yes, because new substances form with different properties than before baking.

• No, because mixing things just makes a mixture, not new substances.

• No, because the substances before and after baking are still types of food.

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In a chemical reaction, where do new substances come from?

• New atoms are made from the heat energy of the reaction.

• Atoms divide into smaller atoms, creating new elements.

• Atoms from the beginning substances rearrange to form a new substance.

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How do new substances like rust (iron oxide) form?

• The old atoms or molecules rearrange and combine in new ways, forming a new substance.

• The atoms or molecules dissolve (mix evenly) together to create new substances.

• Some atoms or molecules are destroyed by fire, leaving new substances behind.

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How can you safely tell if a chemical reaction occurs when you mix substances together?

• Observe the substances' properties before and after mixing them to see if they are different.

• Watch for signs of a reaction and use your bare hands to check how the mixture feels while mixing.

• Taste the substances before and after mixing to see if they taste the same. 

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Which property of baking soda and road salt was different AFTER mixing the substances in the plastic bag.

• Color

• Mass

• Texture

• Solubility

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Highlight or underline the ONLY explanation that compares a property of the substances.

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What are the names of the PRODUCTS (new substances) formed during the chemical reaction inside the plastic bag?

• road salt and baking soda

• table salt and chalk

• road salt and table salt

• baking soda and chalk

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Categorize the terms to describe the REACTANTS and PRODUCTS of this chemical reaction. Zoom in and use the picture to help you.

Groups:

(a) REACTANTS

,

(b) PRODUCTS

• Old Stuff

• Salt

• Baking Soda

• Starting substances

• Chalk

• New Stuff

• Road Salt

• Ending substances

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Comparing the properties of which two substances prove that a chemical reaction formed a new substance after mixing?

• Compare road salt with baking soda

• Compare table salt with chalk

• Compare baking soda with chalk

Answer explanation

You must compare one old substance with one new substance to show that they are different, by showing they have different properties.

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What is the scientific reason that straw cannot be turned into gold?

• Gold is made purely of gold atoms, and the atoms in straw molecules cannot turn into gold atoms.

• Straw is too light to be converted into a heavy metal like gold.

• The process of turning straw into gold requires too much energy.

• Straw lacks the necessary properties to become gold.

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