IGCSE Chemistry Paper-1: Specimen Questions with Answers 1 - 2 of 99

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Question 1

Question MCQ▾

Which diagram could represent the structure of an alloy?

Choices

Choice (4)

a.

Understanding the Structure of an Alloy Choice A

b.

Understanding the Structure of an Alloy- Choice 2

c.

Understanding the Structure of an Alloy - Choice C

d.

Understanding the Structure of an Alloy
Edit

Answer

d.

Explanation

An alloy is a mixture of two or more elements, where at least one element is a metal. Many alloys are mixtures of two or more metals. In an alloy, apart from the atoms of the main metal, there are also atoms of the alloying agents dotted throughout the structure. These different sizes distort the regular arrangements of atoms. This makes it more difficult for the layers to slide over each other, so alloys are harder than the pure metal.

Question 2

Question MCQ▾

Greenhouse gases lead to climate change. Two of these gases are emitted into the atmosphere as a result of processes within animals. Gas … 1 … is produced by process … 3 …

Gas … 2 … is produced by process … 4 … . What is 1,2, 3 and 4?

Choices

Choice (4)

a.

1 = CO, 2 = C2H6 , 3 = Digestion and 4 = respiration

b.

1 = CO, 2 = C2H6 , 3 = respiration and 4 = digestion

c.

1 = CO2, 2 = CH4 , 3 = Digestion and 4 = respiration

d.

1 = CO2, 2 = CH4, 3 = respiration and 4 = digestion

Edit

Answer

d.

Explanation

  • Respiration is the process by which animals exchange carbon dioxide and water with the environment.
  • The second-most important greenhouse gas after carbon dioxide, methane is produced by cattle, dairy cows, buffalo, goats, sheep, camels, pigs, and horses. Most livestock-related methane emissions are produced by “enteric fermentation” of food by bacteria and other microbes in the animals digestive tracts.

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