Chemistry Experiment Observations: Magnesium Oxide and Zinc Reactions

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What is the coefficient of H2O in the initial equation before balancing?

6

8 (correct)

2

4

How many iron atoms are in the Fe3O4 molecule in the products in the partially balanced equation?

2

4

3 (correct)

1

In the fully balanced equation, how many atoms of hydrogen are present in the reactants?

2

8

6

4 (correct)

What is the total number of oxygen atoms in Fe3O4 in the balanced equation?

6 Signup and view all the answers

Why is this method referred to as the 'hit-and-trial method' for balancing chemical equations?

It requires multiple attempts before finding the correct coefficients. Signup and view all the answers

What information is missing in the fully balanced equation?

Physical states of the reactants Signup and view all the answers

What is the colour of the iron nail after it is dipped in the copper sulphate solution?

Brownish Signup and view all the answers

What type of reaction occurs when iron displaces copper from copper sulphate solution?

Displacement reaction Signup and view all the answers

What is the product formed when zinc reacts with copper sulphate solution?

Zinc sulphate Signup and view all the answers

What is the observation when sodium sulphate solution is mixed with barium chloride solution?

A white insoluble substance is formed Signup and view all the answers

Which of the following elements is more reactive than copper?

Zinc Signup and view all the answers

What is the chemical formula for the reaction between iron and copper sulphate solution?

Fe + CuSO4 → FeSO4 + Cu Signup and view all the answers

During the reaction CuO + H2 → Cu + H2O, which substance is being oxidised?

CuO Signup and view all the answers

Which statement is true about redox reactions?

The substance losing hydrogen is oxidised Signup and view all the answers

What product is formed when magnesium ribbon burns in oxygen?

Magnesium oxide Signup and view all the answers

In the example reaction ZnO + C → Zn + CO, which substance is being reduced?

ZnO Signup and view all the answers

Which compound undergoes reduction in the reaction MnO2 + 4HCl → MnCl2 + 2H2O + Cl2?

MnO2 Signup and view all the answers

What is the product when lead nitrate solution is mixed with potassium chloride solution?

Lead iodide Signup and view all the answers

What is a word-equation in chemistry?

An equation that represents a chemical reaction using words Signup and view all the answers

What observation indicates that a chemical reaction has taken place?

Evolution of a gas Signup and view all the answers

What happens to a substance that gains oxygen during a reaction?

It undergoes oxidation Signup and view all the answers

Which of the following is a characteristic of redox reactions?

Two reactants undergo opposite processes Signup and view all the answers

Why is using chemical formulae instead of words beneficial in chemical equations?

To make the equations more concise and useful Signup and view all the answers

What happens when zinc granules react with hydrochloric acid?

Heat is evolved Signup and view all the answers

Where are the reactants typically placed in a chemical equation?

On the left-hand side (LHS) Signup and view all the answers

Which activity corresponds to the formation of hydrogen gas by the action of dilute sulphuric acid on zinc?

Activity 1.3 Signup and view all the answers

What is the purpose of mentioning the caution to handle the acid with care in Activity 1.3?

To ensure safety while handling corrosive substances Signup and view all the answers

Which part of a chemical equation indicates the direction of the reaction?

Arrowhead pointing towards the products Signup and view all the answers

What does it mean if the number of atoms of each element is the same on both sides of a chemical equation?

The equation is balanced Signup and view all the answers

In a chemical equation, where are the products usually positioned?

On the right-hand side (RHS) Signup and view all the answers