Tag: endothermic reactions

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Multiple choice chemistry endothermic and exothermic reactions endothermic reactions what are enthalpy changes energy change in chemical reactions

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

  1. combination of carbon and oxygen to form carbon monoxide.

  2. combination of nitrogen and oxygen to form nitrogen monoxide

  3. combination of glucose and oxygen to form carbon dioxide and water

  4. combination of zinc and hydrochloric acid to form zinc chloride and hydrogen.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
(A) This is an incomplete combustion reaction so energy will be released.
(B)Combination of nitrogen and oxygen to form Nitrogen Monoxide-
Heat is required for this process.
So $N _2 + O _2\rightarrow2NO-180.6KJ$ is an endothermic reaction.
(C) combination of glucose and oxygen to form carbon dioxide and water is a combustion reaction.So energy will be released.
(D)in a combination of zinc and hydrochloric acid to form zinc chloride and hydrogen heat is released.

so correct answer is  (B).
Multiple choice chemistry endothermic and exothermic reactions endothermic reactions what are enthalpy changes energy change in chemical reactions

The formation of a larger chemical from the smaller components is known as 

  1. an endothermic reaction that requires energy

  2. an endothermic reaction that releases energy

  3. an exothermic reaction that requires energy

  4. an exothermic reaction that releases energy

  5. hydrolysis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The internal energy of a larger chemical is smaller than that of the constituent ones. Hence energy is liberated when smaller components combine to form a large molecule. Hence the process is exothermic.

The correct answer is option D.

Multiple choice chemistry endothermic and exothermic reactions endothermic reactions what are enthalpy changes energy change in chemical reactions

Which is a reaction that absorbs energy?

  1. Exothermic

  2. Particle Size

  3. Endothermic

  4. Catalyst

  5. Concentration
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The term endothermic process describes the process or reaction in which the system absorbs energy from its surroundings; usually, in the form of heat. The opposite of an endothermic process is an exothermic process, one that releases, "gives out" energy in the form of heat.

Multiple choice chemistry endothermic and exothermic reactions endothermic reactions what are enthalpy changes energy change in chemical reactions

Which term means a reaction which releases energy?

  1. Exothermic

  2. Particle Size

  3. Endothermic

  4. Catalyst
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An exothermic reaction is a chemical reaction that releases energy by light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy.

Multiple choice chemistry endothermic and exothermic reactions endothermic reactions what are enthalpy changes energy change in chemical reactions

The dissolution in water of which of the following substances is endothermic?

  1. Hydrochloric acid

  2. Sodium hydroxide

  3. Pure sodium

  4. Ammonium chloride
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(A) $HCl _{(l)}+H _2O _{(l)}\rightarrow HCl _{(aq)}+$ Heat (exothermic)

(B) $NaOH+H _2O\rightarrow Na^++OH^-+H _2O+$ Heat (exo)
(C) $Na _{(s)}+H _2O\rightarrow NaOH+$ Heat (exo)
(D) $AlCl _3+H _2O\rightarrow Al(OH) _3+3HCl$ (endo)

(D) is endothermic reaction.

Multiple choice chemistry endothermic and exothermic reactions endothermic reactions what are enthalpy changes energy change in chemical reactions

The decomposition of vegetable into compost is an example of __________ reaction.

  1. exothermic

  2. endothermic

  3. displacement

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The decomposition of vegetable into compost is an example of  exothermic reaction.

The decomposition of vegetable matter into useful compost is carried out by microbes.These reactions involve break down of bonds.The overall reaction is exothermic.

Multiple choice chemistry endothermic and exothermic reactions endothermic reactions what are enthalpy changes energy change in chemical reactions

$Si + C \rightarrow$ SiC. This chemical reaction is an example for:

  1. exothermic reaction

  2. endothermic reaction

  3. dissociation reaction

  4. displacement reaction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$Si + C \rightarrow SiC$.

This chemical reaction is an example of an exothermic reaction as heat is liberated during the reaction. It is also an example of a combination reaction. Two elements combine to form a single compound.

Multiple choice chemistry endothermic and exothermic reactions endothermic reactions what are enthalpy changes energy change in chemical reactions

To start, every biochemical reaction is:

  1. exergonic

  2. endergonic
  3. both $A$ and $B$

  4. none of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Since any chemical reaction requires some energy of activation to start with, so this step is endergonic or since biochemical reaction is also a type of chemical reaction, so its first step is endothermic or endergonic.

Multiple choice chemistry endothermic and exothermic reactions endothermic reactions what are enthalpy changes energy change in chemical reactions

A solution of 500 ml of 0.2 M KOH and 500 ml of 0.2 M HCl is mixed and stirred; the rise in temperature is $T _1$. The experiment is repeated using 250 ml of each solution, the temperature raised is $T _2$. Which of the following is true :

  1. $T _1=T _2$
  2. $T _1=2T _2$
  3. $T _1=4T _2$
  4. $T _2=9 T _1$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The neutralization reaction between a strong acid (HCl) and a strong base (KOH) is exothermic. The temperature rise depends on the heat released per mole of water formed; since the concentration and molar ratios remain the same in both experiments, the temperature rise T1 and T2 should be identical.

Multiple choice chemistry endothermic and exothermic reactions endothermic reactions what are enthalpy changes energy change in chemical reactions

The following is (are) endothermic reaction(s) :

  1. Combustion of methane.

  2. Decomposition of water

  3. Dehydrogenation of ethane to ethylene.

  4. Conversion of graphite to diamond.
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation

Combustion reaction are exothermic, hydrogenation of alkenes are exothermic and graphite is thermodynamically more stable.