Endothermic and Exothermic Reaction

Q. Question 9
What does one mean by exothermic and endothermic reactions? Give examples.

Q.

Why should magnesium ribbon be cleaned before burning in air?

Q.

Take about 2g barium hydroxide in a test tube add 1g of ammonium chloride and mix with help of a glass rod touch the bottom of test tube, is this an exothermic or endothermic reaction

Q.

Why is photosynthesis considered an endothermic reaction ?

Q.

Question 9

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
(iv) The pH of the resulting solution will be less than seven

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)

Q.

1. What happens when water is added to quick lime?

Q.

Are all decomposition reactions endothermic?

Q.

What happens when sulfur and iron are heated?

Q. Burning of magnesium ribbon is exothermic or endothermic reaction?

Q.

Reaction between Ammonium chloride and Barium hydroxide is :

1. Exothermic reaction

2. Chemical change

3. Endothermic reaction

4. None of these

Q. When calcium oxide is added to water taken in a beaker, rise in temperature is observed. However when barium hydroxide is mixed with ammonium chloride, a fall in temperature is observed. Why?

Q.

Classify the following reaction into exothermic and endothermic reactions-

Reaction between zinc and dilute Sulphuric acid.

Q.

(a) What do you understand by exothermic and endothermic reactions ?

(b) Give one example of an exothermic reaction and one of an endothermic reaction.

(c) Which of the following are endothermic reactions and which are exothemic reactions ?

(i) Buring of natural gas (ii) Photosynthesis

(iii) Electrolysis of water (iv) Respitation

(v) Decomposition of calcium carbonate

Q.

Identify the type of reaction

The reaction mixture becomes warm

Q. Explain combustion reaction with one example.

Q. Classify the process of burning magnesium ribbon in the air as an exothermic or endothermic process.

Q.

One of the following is an endothermic reaction. This is :

(a) combination of carbon and oxygen to form carbon monoxide

(b) combination of nitrogen and oxygen to form nitrogen monoxide

(c) combination of glucose and oxygen to form carbon dioxide and water

(d) combination of zinc and hydrochloric acid to form zinc chloride and hydrogen

Q.

Why the combustion of LPG gas is a chemical change

Q.

Which of the following is/are thermochemical reaction(s)?

1. $CaO\left(s\right)+H_{2}O\left(l\right)\to Ca\left(OH{)}_2\right(aq)$

2. $Cu\left(s\right)+Zn\left(SO{)}_4\right(aq)\to Cu(SO{)}_4\left(Aq\right)+Zn\left(s\right)$

3. $2Na\left(s\right)+2H_{2}O\left(l\right)\to 2NaOH\left(aq\right)+H_2\left(g\right)$

4. $H_2\left(g\right)+C{l}_2\left(g\right)\to 2HCl\left(g\right)$

Q.

Why the temperature of the mixture of HCl rises when aluminium is added to it.

Q. Formation of snow in a cloud is an example of:

1. Both (a) and (b)
2. Endothermic reaction
3. Decomposition reaction
4. Exothermic reaction

Q.

All decomposition reactions are not endothermic reactions.

1. True

2. False

Q. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
[3 Marks]

Q.

One of the following is an exothermic reaction. This is :

(a) electrolysis of water

(b) conversion of limestone into quicklime

(c) process of respiration

(d) process of photosynthesis

Q.

Question 22
Which among the following changes are exothermic or endothermic in nature?

(a) Decomposition of ferrous sulphate

(b) Dilution of sulphuric acid

(c) Dissolution of sodium hydroxide in water

(d) Dissolution of ammonium chloride in water

Q.

Name 3 chemical reaction in which heat is evolved and 3 chemical reaction in which heat is absorbed

Q.

We say that cooking is also a chemical reaction.so when we cook something we provide heat.and when food is ready it produces heat.

Which type of reaction is this

Exothermic or endothermic????

Q.

Why is photosynthesis considered as an endothermic reaction

Q.

Which of the following reactions are exothermic in nature?

1. Evaporation of water
2. Dissolution of sodium hydroxide in water
3. Dilution of sulphuric acid
4. Combustion of methane gas

Q. Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?
(i) It is an endothermic reaction.
(ii) It is an exothermic reaction.
(iii) The pH of the resulting solution will be more than seven.
(iv) The pH of the resulting solution will be less than seven.

1. (i) and (ii)
2. (i) and (iv)
3. (iii) and (iv)
4. (ii) and (iii)