1.1 Introduction to the particulate nature of matter and chemical change SL Paper 1

Reference code : 18M.1.sl.TZ2.1

Question

What is the sum of the coefficients when the equation is balanced with the lowest whole number ratio?

__Na₂S₂O₃(aq) + __HCl(aq) → __S(s) + __SO₂(g) + __NaCl(aq) + __H₂O(l)

A. 6

B. 7

C. 8

D. 9

Markscheme

C

Reference code : 18M.1.sl.TZ1.1

Question

Which is a homogeneous mixture?

A. Oil and water

B. Sand and water

C. Ethanol and water

D. Chalk and sand

Markscheme

C

Reference code : 17N.1.sl.TZ0.4

Question

What is the sum of the coefficients when the following equation is balanced using the smallest whole numbers?

__C₆H₁₂O₆ (aq) → __C₂H₅OH (aq) + __CO₂ (g)

A. 4

B. 5

C. 9

D. 10

Markscheme

B

Reference code :17N.1.sl.TZ0.4

Question

What is the sum of the coefficients when the following equation is balanced using the smallest whole numbers?

__C₆H₁₂O₆ (aq) → __C₂H₅OH (aq) + __CO₂ (g)

A. 4

B. 5

C. 9

D. 10

Markscheme

B

Examiners report

[N/A]

Reference code :17M.1.sl.TZ2.1

Question

What is the sum of the coefficients when the equation is balanced with whole numbers?

_—C₈H₁₈(g) + _—O₂(g) → _—CO(g) + _—H₂O(l)

A. 26.5

B. 30

C. 53

D. 61

Markscheme

C

Examiners report

[N/A]