Chemical Equation

Q.

Balance the following chemical equations?

${\mathrm{Na}}_2{\mathrm{O}}_2+{\mathrm{H}}_2\mathrm{O}\to \mathrm{NaOH}+{\mathrm{O}}_2$

Q.

What information does a balanced equation convey?

Q.

Define reactants.

Q.

How do the hit and trial method of balancing equations differ from the partial equation method?

Q.

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction is equal on the reactant and product side.

1. True

2. False

Q.

Substances taking part in a chemical reaction are called ______.

1. Products

2. Reactants

3. Both a and b

4. Elements

Q.

Which of the following is/are involved in a chemical reaction?

1. Breaking of bonds

2. Formation of bonds

3. Restructuring of bonds

4. All of the above

Q.

Give one example each of which illustrates the following characteristics of a chemical reaction:

(a) Evolution of a gas
(b) Change of colour

Q.

_________ are the substance that combine in a reaction.

Q. When a reaction takes place, the mass of the individual elements changes after the reaction is over.

1. False
2. True

Q.

A substance that takes part in a chemical reaction is called a ______ . (reactant/product)

Q.

Representation of reactants and products of a given chemical reaction is called:

1. Chemical equation

2. Chemical equilibria

3. Periodic table

4. Chemical formulae

Q.

In a chemical reaction, the substances which take part in a chemical reaction are called products.

1. True
2. False

Q. What is a chemical reaction? Explain with an example.

Q.

Fill in the blank spaces by choosing the correct words from the given list.

List: products, yield, balanced, left, formulae

An equation in which the number of each atom of an element on the reactants side is equal to the number of each atom of an element on the product side, is called ________ chemical equation.

Q. When an iron gate turns to rust over the years, the total mass of iron reduces.

1. False
2. True

Q.

Which coloured entity can be changed to balance the chemical reaction?

1. Entities in green

2. Entities in red

3. Entities in both red and green

4. None of the colour

Q. is conserved in a chemical reaction.

1. Mass
2. Density
3. Volume

Q. In a chemical reaction, reactant A gets converted to B and C as shown below.
A $\to$ B + C

If the masses of A and C are 40 g and 10 g respectively, the mass of B will be ______.

1. 20.5 g
2. 28 g
3. 30 g
4. 18 g

Q. Slide to the correct value of x to balance the given equation.

${\mathrm{Fe}}_2{O}_3\left(s\right)+3H_2\left(g\right)\to 2\mathrm{Fe}\left(s\right)+{\mathrm{xH}}_{2}O\left(l\right)$

1. 3

Q.

Which among the following is written on the left-hand side of a chemical equation?

1. Reactant

2. Product

3. Gas formed

4. None of the above

Q. In the chemical reaction shown below, the mass of water formed is _______.

Acid + Base $\to$ Salt + Water
35 g 40 g 57 g ?

1. 24.5
2. 16.25
3. 18
4. 20

Q.

Differentiate between the reactants and products.

Q. How much amount of ammonia is produced when 28 g of nitrogen react with 6 g of hydrogen?

1. 28 g
2. 6 g
3. 34 g
4. 32 g