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
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