MULTIPLE CHOI question CE. Choose the one alternative that best completes the st

Question

MULTIPLE CHOI question CE. Choose the one alternative that best completes the statement or answers the 1) of the following, only is a chemical reaction A) crushing of stone B) dropping a penny into a glass of water C) melting of lead D) tarnishing of silver E) dissolving sugar in water 2) Which of the following statements is INCORRECT? A) ethanol is a compoand B) tap water is a homogenous mixture C) bromine gas is an element D) 10% hydrogen peroxide is a cormpound E) rock is a heterogenous mixture 3) Which one of the following is an intensive property A) amount B) heat content C) volume D) mass E) temperature 4) A temperature of 300. K is the same as A)81 B) 63 C) 711 D) 260 E)351 5) Of the following, ing,- -'s the largest mas A)2.5 x 0-2 mg B)25 kg C)2.5 x 109 g D)2.5 × 1010 ng E)2.5x 1015 pg 6) The density of air under ordinary conditions at 25 °C is 1.19 g/l. How many kilograms of air are in a room that measures 11.0ft B) 40.8 11.0 ft and has an 10.0 ft cciling? A) 0.152 C)4.08x 104 D) 3.66 E) 0.0962

Explanation / Answer

1) D) tarnishing of silver is a chemical reaction between silver and sulfur containing substances present in air.

2) C) bromine gas formula is Br,2 and it is a compound and not an eleelement.

3) E) Temperature. An intensive property is a physical quantity whose value does not depend on the amount of the substance for which it is measured.

4)° F = 9/5 (K - 273) + 32 = 9/5 ( 300 - 273) + 32 = 80.6 F

Option A) is correct.

5) B) 25 kg is correct.

6) volume of room = 11ft x11ft X 10 ft = 1210 ft^3.

1210 ft^3 = 34263.4 l

Mass of air = 34263.4 l x 1.19 g/ ml = 40773 g = 40.8 kg

Option B) is correct.

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