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IGCSE™️ Chemistry: Chemical reactions Flashcards | StudBud

Explore/IGCSE™️ Chemistry: Chemical reactions

IGCSE™️ Chemistry: Chemical reactions

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Aligned to Cambridge IGCSE™️. Suitable for ages 14-16. Test your knowledge on Chemical Reactions. #IGCSE #Chemistry #science (This resource is not endorsed by Cambridge Assessment International Education)

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Questions 8

Answers

1
Which action results in a chemical change?
Add sodium nitrate to water
Add sodium chloride to water
Add sodium hydroxide to water
Add sodium to water
2
Water is added to anhydrous cobalt(II) chloride crystals. What happens during the reaction?
The cobalt(II) chloride turns pink and becomes cold.
The cobalt(II) chloride turns blue and becomes cold.
The cobalt(II) chloride turns pink and becomes hot.
The cobalt(II) chloride turns blue and becomes hot.
3
What is the correct description for the arrow labelled B?
Enthalpy change of the reaction
Reacting mass
Activation energy
Formula of products
4
Iron is being oxidised in the following reaction: 2Fe + 3Cl₂ → 2FeCl₃. True or False?
True
False
5
Which of these reactions is exothermic?
2H2O → O2 + 2H2
CaCO3 → CO2 + CaO
2NaCl + 2H2O → H2 + Cl2 + 2NaOH
CH4 + 2O2 → CO2 + 2H2O
6
What is the correct description for the arrow labelled A?
Change in energy
Activation energy
Formula of products
Reacting mass
7
For which reaction would this apparatus be suitable for measuring the rate of reaction?
2H2(g) + O2(g) → 2H2O(l)
MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(l)
NaOH(aq) + 2HCl(aq) → NaCl(aq) + H2O(l)
CaCO3(s) + 2HCl(aq) → CO2(g) + CaCl2(aq) + H2O(l)
8
What is meant by the term endothermic?
Energy is absorbed from surroundings.
The mass of the reactants decreases.
A gas is produced.
Light energy is produced.