Balancing Chemical Equations

Q.

$BariumChloride+AluminiumSulphate\to BariumSulphate+AluminiumChloride$

Which of the following balanced chemical equation represent the above chemical reaction correctly?

1. (aq) + +

2. (aq) + +

3. (aq) + +

4. + +

Q.

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

Q.

How will you verify the law of conservation of mass experimentally?

Q.

Write the balanced and informative chemical equation for the following

Dilute hydrochloric acid reacts with calcium to produce calcium chloride and hydrogen.

Q.

Bromine gas (${\text{Br}}_2$) reacts with sodium carbonate (${\text{Na}}_2{\text{CO}}_3$) in aqueous solution and gives sodium bromide ($\text{NaBr}$), sodium bromate (${\text{NaBrO}}_3$) and carbon-dioxide gas. How many sodium bromide molecules are obtained in the balanced chemical equation ? [2 MARKS]

Q.

Balance the following chemical equations?

${\mathrm{NaNO}}_3+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{Na}}_2{\mathrm{SO}}_4+{\mathrm{HNO}}_3$

Q.

Write the balanced equation for the following reaction:

Sodium hydroxide reacts with calcium bromide to form calcium hydroxide and sodium bromide.

1. $NaOH+CaB{r}_2\to Ca(OH{)}_2+NaBr$

2. $NaOH+CaBr\to Ca(OH{)}_2+2NaBr$

3. $2NaOH+CaB{r}_2\to Ca(OH{)}_2+NaB{r}_2$

4. $2NaOH+CaB{r}_2\to Ca(OH{)}_2+2NaBr$

Q.

Which of the following statements best defines the law of conservation of mass?

1. 
   

   Mass cannot be created but it can be destroyed under extreme pressures.

2. 
   

   Mass cannot be conserved during a chemical reaction; a little bit of mass is always lost.

3. 
   

   The mass of a closed system cannot change over time; mass cannot be created nor destroyed.

4. 
   

   When added to a system, energy can destroy mass.

Q.

Malonic acid on dehydration with ${\mathrm{P}}_4{\mathrm{O}}_{10}$gives an oxide, which is ___________

Q.

A molecule of ammonia gas is represented as NH₂.

1. True
2. False

Q.

What is the difference between a word equation and a chemical equation?

Q.

What is a chemical equation? Write the steps involved in writing a chemical equation.

Q.

The chemical equation ${\mathrm{N}}_2{\mathrm{O}}_5+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{HNO}}_3$ in balanced form will be

1. ${\mathrm{N}}_2{\mathrm{O}}_5+2{\mathrm{H}}_2\mathrm{O}\to 2{\mathrm{HNO}}_3$

2. $2{\mathrm{N}}_2{\mathrm{O}}_5+{\mathrm{H}}_2\mathrm{O}\to 2{\mathrm{HNO}}_3$

3. ${\mathrm{N}}_2{\mathrm{O}}_5+{\mathrm{H}}_2\mathrm{O}\to 2{\mathrm{HNO}}_3$

Q.

Write the number of atoms of each element present in the following compounds:

$\mathrm{NaOH}$

Q.

A chemical reaction can be represented using the ________ and ________ of the reactants and products.

Q.

The mass of the substance remains same during the physical change

1. True
2. False

Q.

Name the constituents of the following compounds

1. Carbon dioxide

Q.

There will be some change in mass when a chemical reaction takes place.

1. True

2. False

Q.

The chemical equation given below is balanced.

$H_2+C{l}_2\to HCl$

1. True

2. False

Q.

$Mg+O_2\to MgO$ is a balanced chemical equation.

1. True

2. False

Q.

A balanced chemical equation always obeys:

1. Law of conservation of mass

2. Law of thermal equilibrium

3. Law of conservation of energy

4. All of the given options

Q.

What is the skeleton equation?

Q.

A chemical equation is balanced according to the law of ___________.

Q.

A chemical compound having smell of chlorine is used to remove yellowness of white clothes in laundries. Name the compound and write the chemical equation involved in its preparation. [2 MARKS]

Q.

A balanced chemical equation doesn't change if all its coefficients are multiplied by a common natural number.

1. False

2. True

Q.

$CaO+H_{2}O\to Ca(OH{)}_2$ is an example of a balanced chemical equation.

1. True

2. False

Q. Balancing the mathematical chemical reaction in reaction with acid (metals and non metals)

Q. Molecules of which of the following substances is made up of more than one kind of atoms?

1. Chlorine
2. Common Salt
3. Hydrogen
4. Neon

Q.

What should be the value of x (coefficient of $H_{2}O$)?

$a{C}_6{H}_{12}{O}_6+b{O}_2\to cC{O}_2+x{H}_{2}O$

1. 4

2. 6

3. 12

4. 8

Q.

How to easily balance equations?