Chemical Reactions Revision

What is the pH level range for acids?

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

Which of the following statements about bases is incorrect?

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

What is a characteristic taste of bases?

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

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

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

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

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

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

What is the general outcome of a neutralization reaction?

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

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)

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.