The observation that 15.0 g of hydrogen reacts with 120.0 g of oxygen to form 13

Question

The observation that 15.0 g of hydrogen reacts with 120.0 g of oxygen to form 135.0 g of water is evidence for the law of A) definite proportions. B) energy conservation. C) mass conservation. D) multiple proportions. Convert 0.003002 to standard scientific notation. A) 3.002 times 10^-3 B) 3002 times 10^-6 C) 3.002 times 10^3 D) 3002 times 10^6 A sailor circumnavigated the earth and covered 4,264,000 meter. Express this number in standard scientific notation. A) 4.264 times 10^-7 m B) 4.264 times 10^-6 m C) 4.264 times 10^6 m D) 4.264 times 10^7 m Solve the following problem: [(1 times 10^-5) times (1 times 10^2)]^2/(1 times 10^3) A) 1 times 10^0 B) 1 times 10^-3 C) 1 times 10^-9 D) 1 times 10^-12 The mass of a single copper atom is 1.055 times 10^-22 g. This is the same mass as A) 1.055 times 10^-16 mg. B) 1.055 times 10^-25 kg. C) 1.055 times 10^-28 mu g D) 1.055 times 10^-31 ng.

Explanation / Answer

1) C) mass conservation

2) A) 3.002 x 10-3

3) C) 4.264 x 106 m

4) C) 1 x 10-9

5) B) 1.055 x 10-25 kg

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