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Chemistry > Chemical Reactions And Equations > Flashcards

Chemical Reactions And Equations Flashcards

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1
Q

What are chemical reactions?

A

Chemical reactions are the processes by which new substances with new properties are formed. These involve chemical changes.

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2
Q

During a chemical reaction, do the atoms of different elements change?

A

No, only rearrangement occurs.

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3
Q

What are reactants?

A

Substances which take part in the reaction.

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4
Q

What are products?

A

Substances which are produced as a result of reaction.

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5
Q

What are the characteristics of a chemical reaction?

A
  1. Evolution of gas
  2. Formation of precipitate
  3. Change in color
  4. Change in temperature
  5. Change in state
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6
Q

What are balanced equations?

A

Balanced equations are those equations which have the equal number of atoms of particular elements in both the reactants and products.

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7
Q

What are unbalanced equations?

A

Unbalanced equations are those which do not have equal number of atoms of elements in the reactants and products.

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8
Q

How are equations made more informative?

A

Chemical equations are made more informative by adding more information such as:
Indicating the physical states of the reactants and products, indicating heat changes taking place in the reaction, and indicating the conditions under which the reaction takes place.

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9
Q

What is a chemical equation?

A

The method of representing a chemical reaction with the help of symbols and formulae of the substances involved in it is known as a chemical equation.

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10
Q

What are the types of chemical reactions?

A
  1. Combination
  2. Decomposition
  3. Displacement
  4. Double displacement
  5. Oxidation and reduction reactions
    6.
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10
Q

What are the types of chemical reactions?

A
  1. Combination
  2. Decomposition
  3. Displacement
  4. Double displacement
  5. Oxidation and reduction reactions

Exothermic and endothermic reactions

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11
Q

Define combination reactions.

A

Combination reactions are those in which two or more reactants combine to form a single product as a result.

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12
Q

Define decomposition reactions.

A

Reactions in which one reactant breaks up into two or more products are called decomposition reactions.

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13
Q

How are combination and decomposition reactions related?

A

Combination reactions are just the opposite of decomposition reactions.

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14
Q

Define displacement reactions.

A

Those reactions in which one element takes the place of another element in a compound, are known as displacement reactions.

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15
Q

Define double displacement reactions.

A

Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions.

16
Q

What are oxidation reactions?

A
  1. Addition of oxygen to a substance
  2. Removal of hydrogen.
17
Q

What are reduction reactions?

A
  1. Addition of hydrogen
  2. Removal of oxygen
18
Q

What are redox reactions?

A

They involve both oxidisation and reduction.

19
Q

What are oxidising agent and reducing agent.

A

Oxidising agent - to which oxygen is added/From which hydrogen is removed.

Reducing agent- from which oxygen is removed/To which hydrogen is added.

20
Q

How is oxidation harmful?

A

Oxidation has a harmful effect on metals and food. The damaging effect of oxidation on metals is studied as corrosion and that on food is studied as rancidity.

21
Q

State some common effects of oxidation obvserved in daily life.

A
  1. Corrosion of metals
  2. Rancidity of food
22
Q

What is corrosion?

A

Corrosion is the process in which metal are eaten up gradually by the action of air, moisture or a chemical (such as an acid) on their surface.
Example, rusting of iron metal.

23
Q

What is rancidity?

A

Oxidation has damaging effects on food containing fats and oils.
The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called rancidity.

24
Q

Rusting is which type of reaction?

A

Redox

Chemistry (1 decks)

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