Chemical Reaction

Q.

Identify the type of following reaction:

$\mathrm{Fe}+{\mathrm{CuSO}}_4\stackrel{}{\to }{\mathrm{FeSO}}_4+\mathrm{Cu}$

Q.

Name the type of chemical reaction that occurs when magnesium ribbon is burned in air.

Q.

Define:

Atomicity

Q.

Formation of water is an example of ____________ reaction

1. Chemical and combination reaction

2. Chemical reaction

3. Combination reaction

4. Substitution reaction

Q. What are the chemical changes that are reversible?

Q.

What is the weight of $1$atom of hydrogen?

Q.

The reaction between sodium carbonate solution and copper sulphate solution is a……………..reaction.

Q.

Why do you think photosynthesis does not take place at night?

Q.

Write the word equation for the reaction:

Calcium carbonate and hydrochloric acid to form calcium chloride, carbon dioxide, and water.

Q.

Two molecules of hydrogen and one molecule of oxygen reacts to give __ molecule(s) of water.

1. 3

2. 4

3. 1

4. 2

Q.

Which of the following are examples of chemical reactions?

1. All of the above
2. Conversion of steam to water
3. Rusting of iron
4. Cutting of wood

Q.

Is polymerization endothermic or exothermic?

Q.

Calculate the empirical and molecular formula of an organic compound whose percentage composition is C=70.54%, H=5.87% and O=23.52%. The molecular weight of compound is 136 g.

Q.

what is double displacement reaction.

what is corrosion.

Q. Which of the following represents a decomposition reaction?

1. $\text{A+B}\to \text{AB}$
2. $\text{A+B}\to \text{B+C}$
3. $\text{AB}\to \text{A+B}$
4. $\text{A+B+C}\to \text{X+Y}$

Q.

Based on the reactions given below, which is the correct decreasing order of the reactivity of the metals?

1. $\mathrm{Zn}\left(\mathrm{s}\right)+{\mathrm{CuSO}}_4\left(\mathrm{aq}\right)\to {\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+\mathrm{Cu}\left(\mathrm{s}\right)$
2. $\mathrm{Cu}\left(\mathrm{s}\right)+2{\mathrm{AgNO}}_3\left(\mathrm{aq}\right)\to \mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2\left(\mathrm{aq}\right)+2\mathrm{Ag}\left(\mathrm{s}\right)$
3. $\mathrm{Zn}\left(\mathrm{s}\right)+{\mathrm{FeSO}}_4\left(\mathrm{aq}\right)\to {\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+\mathrm{Fe}\left(\mathrm{s}\right)$
4. $\mathrm{Fe}\left(\mathrm{s}\right)+{\mathrm{CuSO}}_4\left(\mathrm{aq}\right)\to {\mathrm{FeSO}}_4\left(\mathrm{aq}\right)+\mathrm{Cu}\left(\mathrm{s}\right)$

1. $\mathrm{Cu}>\mathrm{Ag}>\mathrm{Fe}>\mathrm{Zn}$

2. $\mathrm{Fe}>\mathrm{Zn}>\mathrm{Cu}>\mathrm{Ag}$

3. $\mathrm{Zn}>\mathrm{Fe}>\mathrm{Cu}>\mathrm{Ag}$

4. $\mathrm{Ag}>\mathrm{Cu}>\mathrm{Zn}>\mathrm{Fe}$

Q.

The chemical equation is a statement that describes a chemical reaction in terms of symbols and formulae.

1. True
2. False

Q.

One molecule of hydrogen and one molecule of chlorine react to give __ molecule(s) of hydrochloric acid.

1. 1

2. 3

3. 2

4. 4

Q.

Write about the limitations of a chemical equation.

Q.

Which of the following are correct with respect to chemical reactions?
(i) Chemical compositon changes
(ii) Formation of new products takes place
(iii) We can’t obtain the intial reactants by simple physical means like filtering, dissolving etc.

1. We can’t obtain the intial reactants by simple physical means like filtering, dissolving etc.

2. All of these

3. Chemical compositon changes

4. Formation of new products takes place

Q.

(1) what are compound radicals?

(2) what is the difference between a chemical equation and a balanced chemical equation?

Q.

Define molecular equation.

Q.

Give one example of a decomposition reaction of a compound into two or more compounds.

Q.

Word equation provides more information than chemical equation.

1. True
2. False

Q.

State what you would observe when: Red lead is heated.

Q.

A chemical reaction involves

1. Only breaking of bonds

2. Only formation of bonds

3. Both breaking and formation of bonds

4. None of the given options

Q.

A reaction in which two or more substances combine to give a new compound is called ____________ reaction.

Q.

Name the type of reaction represented below:

$\mathrm{XY}\to \mathrm{X}+\mathrm{Y}$

Q.

Write the skeletal equations for the following word equations.

$\mathrm{Magnesium}+\mathrm{Oxygen}\to \mathrm{Magnesium}\mathrm{oxide}$

Q.

What is the mass percentage of carbon in $\mathrm{CO}$? What is the mass of carbon in $4.9\text{g}$ of $\mathrm{CO}$?