CIE Chemistry Paper-1: Specimen Questions 40 - 41 of 99

Question number: 40

MCQ▾

Question

The diagram shows the positions of elements L, M, Q, R and T in the Periodic Table. These letters are not the chemical symbols of the elements.

Define characteristics of elements L, M, Q, R and T in table.

Define characteristics of elements L, M, Q, R and T in table.

Find special characteristics of elements L, M, Q, R and T

Which statement about the properties of these elements is correct?

Choices

Choice (4) Response
a.

T is more reactive than R.

b.

L reacts more vigorously with water than does M.

c.

T exists as diatomic molecules.

d.

L, M and Q are all metals.

Answer

d.

Explanation

The above diagram shows that

  • L and M belongs to group 1 (alkali metals)
  • Q belongs to group 3 (Lanthanides)

Metals comprise the large majority of the elements, and can be subdivided into several different categories. From left to right in the periodic table, these categories include the highly reactive alkali metals; the less reactive alkaline earth metals, followed by lanthanides.

Metals form mixtures when combined with other metals and tend to lose or share electrons when they react with other substances; and each forms at least one predominately basic oxide.

Question number: 41

MCQ▾

Question

The table shows the structure of different atoms and ions.

Particles with proton and neutron numbers

Total number of protons, electrons and neutrons

particle

proton

nucleon

number of

number of

number of

number

number

protons

neutrons

electrons

Mg

12

24

12

W

12

Mg2+

X

24

12

12

10

F

9

19

9

Y

9

F

9

19

9

10

Z

What are the values of W, X, Y and Z?

Choices

Choice (4) Response
a.

W = 10 X = 10 Y = 9 Z = 9

b.

W = 10 X = 12 Y = 10 Z = 9

c.

W = 12 X = 10 Y = 9 Z = 10

d.

W = 12 X = 12 Y = 10 Z = 10

Answer

d.

Explanation

  • X = No. of neutrons = Nucleon no. – proton no

= 24 - 12 = 12

  • . All atoms of the same element have same number of protons. The 2 + charge means there’s 2 fewer electrons than there are protons.
  • Therefore, Y = 12
  • Y = No. of neutrons = Nucleon no. – proton no

= 19 - 9 = 10

Z = No of electrons = no of protons

= 9 + 1 (for the negative charge) = 10

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