Chemical Reactions - 6.1- 6.6

Question 1

Define Activation Energy

Answer 1

the minimum quantity of energy which the reacting species must possess in order to undergo a specified reaction.

Question 2

Destinguish the difference between endothermic and exothermic reactions

Answer 2

Chemical reactions that absorb (or use) energy are called endothermic. Chemical reactions that release energy are called exothermic.

Question 3

State the three key differences between Acid and Base

Answer 3

ACID:
strength of Acid depends on Concentration of Hydrogen ions.
Acids react with bases to form salts.
Acid turns blue litmus paper into red.
BASE:
Strength of Base depends on Concentration of Hydroxide ions
Bases react with acids to form salts.
Bases turn red litmus paper into blue.

Question 4

What are the pH ranges of acid and base

Answer 4

pH of less than 7 indicates acidity and anything greater indicates a base.

Question 5

What is the word equation for neutralization reactions

Answer 5

Acid + Base = Salt + Water

Question 6

Write the word equations for acids reacting with metals

Answer 6

Metal + Acid → Salt + Hydrogen

Question 7

Write the word equations for metal reacting with oxygen

Answer 7

metal + oxygen → metal oxide

Question 8

Write the word equations for Combustion reactions

Answer 8

Fuel + O2 → CO2 + H2O

Question 9

Name examples of alcohol

Answer 9

Ethanol, Methanol, Propanol

Question 10

what are advantages and disadvantages of biofuels

Answer 10

Advantages:
they are renewable sources, they slow climate change, are easily produced, cause less pollution, are accessible, and are energy-efficient.
Disadvantages:
The disadvantages are that they encourage single crop harvesting, resource & food mismanagement, and are climate dependent.