Chemical Reactions Revision
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Questions and Answers

What is the pH level range for acids?

  • 0-4
  • 5-9
  • 1-6 (correct)
  • 7-14

Which of the following colors indicates the presence of a strong acid in a universal indicator?

  • Green
  • Blue
  • Red (correct)
  • Yellow

Which of the following statements about bases is incorrect?

  • Bases taste bitter.
  • Weak bases can appear blue in a universal indicator.
  • Strong bases have a pH level of 8-14.
  • Strong bases turn universal indicator red. (correct)

What color does a weak acid typically appear in a universal indicator?

<p>Green/Yellow (D)</p> Signup and view all the answers

What is a characteristic taste of bases?

<p>Bitter (C)</p> Signup and view all the answers

What products are formed when an acid reacts with a metal carbonate?

<p>Salt, water, and carbon dioxide (C)</p> Signup and view all the answers

Which of the following represents a worded equation for a combustion reaction?

<p>Hydrocarbon + oxygen → carbon dioxide + water (B)</p> Signup and view all the answers

When magnesium reacts with hydrochloric acid, what type of reaction occurs?

<p>Acid and metal (C)</p> Signup and view all the answers

Which of the following is NOT a product of the reaction between an acid and a base?

<p>Carbon dioxide (A), Acid (B)</p> Signup and view all the answers

Identify the correct worded equation for the combination of a non-metal with oxygen.

<p>Oxygen + sulfur → sulfur dioxide (B), Hydrogen + oxygen → water (D)</p> Signup and view all the answers

Which statement best describes the reaction of a metal with oxygen?

<p>It produces metal oxide (A)</p> Signup and view all the answers

What is the general outcome of a neutralization reaction?

<p>Production of salt and water (C)</p> Signup and view all the answers

In the context of acid reactions, which product is always formed when an acid reacts with a metal?

<p>Salt (A), Hydrogen (C)</p> Signup and view all the answers

Flashcards

Endothermic Reaction

A chemical reaction that absorbs heat from the surroundings.

Exothermic Reaction

A chemical reaction that releases heat to the surroundings.

Acid

A substance that has a sour taste, low pH levels (1-6), and turns universal indicator colors like red or green/yellow (depending on strength).

Base

A substance that has a bitter taste, high pH levels (8-14), and turns universal indicator colors like blue or purple (depending on strength).

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pH Level

A measure of how acidic or basic a substance is.

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Neutralization Reaction

A reaction between an acid and a base, producing a salt and water.

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Acid + Carbonate

An acid reacting with a metal carbonate produces a salt, water, and carbon dioxide.

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Acid + Metal

An acid reacting with a metal produces a salt and hydrogen gas.

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Metal + Oxygen

A metal reacting with oxygen produces a metal oxide.

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Non-metal + Oxygen

A non-metal reacting with oxygen produces a compound containing oxygen.

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Combustion

A reaction of a fuel with oxygen producing CO2 and H2O.

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Hydrocarbon

A compound that contains only Hydrogen and Carbon.

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Study Notes

Chemical Reactions Revision

  • Physical vs. Chemical Changes:

    • Physical changes alter appearance but not the substance's makeup (e.g., melting ice, dissolving salt).
    • Chemical changes create new substances (e.g., burning wood, reacting magnesium with acid).
  • Indicators of Chemical Change:

    • Production of light
    • Production of heat
    • Production of sound
    • Change in colour
    • Production of an odour
    • Formation of bubbles or gases
    • Formation of a precipitate (solid particles)
  • Reactants and Products:

    • Reactants are the starting substances in a chemical reaction.
    • Products are the substances formed as a result of the reaction.
  • Bond Changes in Reactions:

    • Chemical bonds between atoms are broken and reformed in different ways during reactions.
  • Endothermic vs. Exothermic Reactions:

    • Endothermic: Reactions absorb heat from the surroundings (e.g., ice melting, photosynthesis, ice packs).
    • Exothermic: Reactions release heat to the surroundings (e.g., adding magnesium to acid, heat packs).
  • Neutralization Reactions:

    • Acid + base → salt + water
    • Example: hydrochloric acid + sodium hydroxide → sodium chloride + water
  • Acid-Metal Carbonate Reactions:

    • Acid + metal carbonate → salt + water + carbon dioxide
    • Example: citric acid + sodium bicarbonate → salt + water + carbon dioxide
  • Acid-Metal Reactions:

    • Acid + metal → salt + hydrogen
    • Example: magnesium + hydrochloric acid → magnesium chloride + hydrogen
  • Metal-Oxygen Reactions:

    • Metal + oxygen → metal oxide
    • Example: magnesium + oxygen → magnesium oxide
  • Non-Metal-Oxygen Reactions:

    • Non-metal + oxygen → non-metal oxide
    • Example: carbon + oxygen → carbon dioxide
  • Combustion Reactions:

    • Fuel + oxygen → carbon dioxide + water (or hydrocarbon + oxygen → carbon dioxide + water)

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Description

Test your understanding of chemical reactions with this quiz. It covers the differences between physical and chemical changes, indicators of chemical reactions, and the concepts of reactants and products. Additionally, explore endothermic and exothermic reactions to reinforce your knowledge.

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