A) potassium phosphate C) potassium hypochlorite B) potassium hydrogen carbonate

Question

A) potassium phosphate C) potassium hypochlorite B) potassium hydrogen carbonate D) potassium iodide E) potassium oxide 11. In which species does ni trogen have the highest oxidation number? B) NH3 ) N2 12. Which hydrocarbon pair below has identical mass percentage C) HNO2 C) HNO2 D) NO2 E) NaNO3 of C? A)C,H, and C,H D)C,H, and C,H, B)C,H, and C,H E) none of the above C)C,H, and C,H 13. Calculate the percentage by mass of oxygen in Pb(NO3)2. A) 9.7 B) 14.5 C) 19.3D) 29.0 ) 33.4 14. Which of the following are combustion reactions? 1) CH4 (g)+O2 (g)CO2 (g)+11,0 (l) 2) CaO (s)+CO, (g) CaCO, (s) 3) PbC03 (s) PbO (s) +CO2 (g) 4) CHOH (I) +02 (g-co, (g) + H2O(1) A) 1 and 4 B) 1,2,3, and 4 C)1,3, and 4 D)2.3, and 4 E) 3 and 4 15. When the following equation is balanced, the coefficients are A) 2, 3, 4,4 D) 4, 4, 32, 36 B) 1, 4, 8, 9 C) 2, 12,8,9 E) 2, 25, 16, 18 16. What is the Fahrenheit temperature closest to 0°C? C. 273 D -273 E. 0 A. -32 Which of the following is a larger mass (weight)? A. 0.01 Kg B. 100 g B. 32 C. 1000 mg D. 10g D. all are same The element in Group IIA and period 4 is B. calcium C. cadmium D. chlorine E. helium A. carbor

Explanation / Answer

11)

oxidation number of N in each species is

N2 ---> 0

NH3 --> -3

HN02 --> +3

N02- ---> +3

NaN03 --> +5

so

the answer is E) NaN03

12)

both should have same empirical formula

C2H4 and C3H6 both have the empirical formula of CH2

so

the answer is D) C2H4 and C3H6

13)

mass of Pb(N03)2 = 331

mass of oxygen = 6 x 16 = 96

so

% mass of oxygen = 96 x 100 / 331 = 29

so

the answer is D) 29

14)

combustion is reacting in the presence of oxygen

so

the answer is A) 1 and 4

15)

the balanced reaction is

2 C8H18 + 25 02 ---> 16 C02 + 18 H20

so

the answer is E) 2, 25 ,16, 18

16)

we know that

F = (9C/5) + 32

so

F = ( 9 x 0 /5) + 32

F = 32

so

the answer is B ) 32

17)

0.01 kg = 10 g

100g = 100 g

1000 mg = 1 g

10-2 g = 0.01 g

so

the larger mass is 100 g

so

the answer is B) 100 g

18)

B) calcium

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