Chemical Reactions and Compounds Quiz
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Questions and Answers

Compounds are chemical substances that contain more than one ______.

element

This tells us there are two ______ atoms for every single carbon atom.

oxygen

Which of the following is NOT evidence of a chemical reaction?

  • An increase in the number of atoms (correct)
  • A change in temperature
  • A change in color
  • Formation of bubbles

    • What happens to atoms during a chemical reaction?

    <p>They are rearranged</p> Signup and view all the answers

    How can chemical reactions be represented?

    <p>Using equations</p> Signup and view all the answers

    Which of the following is NOT evidence of a chemical reaction?

    <p>An increase in the number of atoms</p> Signup and view all the answers

    Chemical reactions can be represented using ______.

    <p>Equations</p> Signup and view all the answers

    What happens to the number of atoms during a chemical reaction?

    <p>It stays the same</p> Signup and view all the answers

    What are some examples of evidence for a chemical reaction?

    <p>Bubbles, a color change, a large energy change</p> Signup and view all the answers

    Why do bubbles form in boiling water, but do not indicate a chemical reaction?

    <p>Because boiling is a physical change, not a chemical reaction</p> Signup and view all the answers

    Why is adding a teabag to boiling water not considered a chemical reaction?

    <p>Because the tea chemicals are dissolving in the water, which is a physical change</p> Signup and view all the answers

    How are chemical reactions used?

    <p>Chemical reactions are used to make useful new chemicals, heat our homes, power our cars, generate electricity, and cook food.</p> Signup and view all the answers

    What is an example of a chemical reaction used in cooking?

    <p>An example of a chemical reaction used in cooking is the reaction that occurs when adding bicarbonate of soda to hot liquid, which creates lots of bubbles.</p> Signup and view all the answers

    What happens when honeycomb is made using chemical reactions?

    <p>When honeycomb is made using chemical reactions, the mixture of honey, glucose (or golden syrup), sugar, water, and bicarbonate of soda creates a chemical reaction that results in the formation of a lava-like substance that hardens and can be eaten once cooled.</p> Signup and view all the answers

    Which ingredient is NOT used in making honeycomb?

    <p>Glucose</p> Signup and view all the answers

    What happens when bicarbonate of soda is added to the mixture?

    <p>The mixture creates a chemical reaction</p> Signup and view all the answers

    What is done to the honeycomb after it hardens?

    <p>It is smashed into pieces</p> Signup and view all the answers

    Which of the following is an example of oxidation mentioned in the text?

    <p>An apple turning brown after being cut</p> Signup and view all the answers

    What happens to a substance when oxygen is bonded to it?

    <p>It undergoes oxidation</p> Signup and view all the answers

    What is the opposite reaction of oxidation?

    <p>Reduction</p> Signup and view all the answers

    Which of the following is an example of oxidation mentioned in the text?

    <p>An apple turning brown after being cut</p> Signup and view all the answers

    What is the term used when oxygen is bonded to a substance?

    <p>Oxidation reaction</p> Signup and view all the answers

    What happens to the mass of iron when it combines with oxygen to form iron oxide?

    <p>The mass increases</p> Signup and view all the answers

    Which of the following is an example of oxidation mentioned in the text?

    <p>C. Iron wool being heated and combining with oxygen to form iron oxide</p> Signup and view all the answers

    What is the opposite reaction of oxidation?

    <p>A. Reduction</p> Signup and view all the answers

    What happens to the mass of iron when it combines with oxygen to form iron oxide?

    <p>C. The mass increases</p> Signup and view all the answers

    Which gas is being released during the reaction described in the text?

    <p>Oxygen</p> Signup and view all the answers

    What is the purpose of adding manganese dioxide in the reaction?

    <p>To make the reaction faster</p> Signup and view all the answers

    What happens to the mass of the manganese dioxide catalyst during the reaction?

    <p>It stays the same</p> Signup and view all the answers

    Which of the following is a typical sign that a chemical reaction is happening?

    <p>A change in temperature</p> Signup and view all the answers

    What is a catalyst?

    <p>A substance that speeds up the rate of a chemical reaction</p> Signup and view all the answers

    What is the purpose of wearing safety glasses and gloves when working with hydrogen peroxide?

    <p>To ensure safety</p> Signup and view all the answers

    Which type of reaction is described as giving off heat into the surroundings?

    <p>Exothermic reactions</p> Signup and view all the answers

    What happens to the temperature of the surroundings when an exothermic reaction occurs in an insulated cup?

    <p>The temperature increases</p> Signup and view all the answers

    What are reactions called that absorb energy from their surroundings and make the reacting substances feel cold?

    <p>Endothermic reactions</p> Signup and view all the answers

    Which of the following is a characteristic of compounds?

    <p>They are made from different types of atoms chemically bonded together</p> Signup and view all the answers

    What is the product of the reaction between iron and oxygen?

    <p>Iron oxide</p> Signup and view all the answers

    What does the arrow in a word equation represent?

    <p>The direction of the reaction</p> Signup and view all the answers

    What should you do if you find yourself with a chip pan or oil fire?

    <p>Cover the pan with a damp cloth</p> Signup and view all the answers

    What is the main reason for tackling different types of fires in slightly different ways?

    <p>To keep people safe</p> Signup and view all the answers

    Why is it unsafe to leave a fire unattended for a long time?

    <p>It may spread and cause more damage</p> Signup and view all the answers

    Which of the following is NOT one of the three things needed for a fire to start?

    <p>Water</p> Signup and view all the answers

    What is oxidation?

    <p>When a substance gains an oxygen atom in a reaction</p> Signup and view all the answers

    What is combustion?

    <p>A chemical reaction when a fuel is burned to release energy</p> Signup and view all the answers

    Study Notes

    Compounds and Chemical Reactions

    • Compounds are chemical substances that contain more than one element.
    • Chemical reactions involve the rearrangement of atoms to form new compound molecules.
    • Example: Carbon atoms react with oxygen atoms to form carbon dioxide (CO₂) molecules, with a ratio of one carbon atom to two oxygen atoms.

    Applications of Chemical Reactions

    • Chemical reactions are used to create new chemicals, such as plastics and medicines.
    • Burning fuels in chemical reactions releases energy, which is used to:
      • Heat homes
      • Power cars
      • Generate electricity
    • Chemical reactions are used in cooking to make food safe and tasty to eat.

    Chemical Reactions in Cooking

    • A chef uses chemical reactions in their kitchen to make honeycomb.
    • The reaction involves adding honey, glucose, sugar, water, and bicarbonate of soda to create a chemical reaction.
    • The reaction produces bubbles, similar to lava, and takes about an hour to harden before it can be eaten.

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    Description

    Test your knowledge of chemical reactions and compounds with this quiz! Learn how atoms rearrange to form new compound molecules and understand the impact of certain compounds, like carbon dioxide, on the environment.

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