QUESTION 8 Hydrogen gas reacts with oxygen gas to form water vapor. If 5.50 g of

Question

QUESTION 8

Hydrogen gas reacts with oxygen gas to form water vapor. If 5.50 g of hydrogen gas react with 10.50 g of oxygen gas, how many grams of water vapor will be produced?

          H2(g)   +   O2(g) => H2O(g)               (not balanced)

49.2 g

16.0 g

5.91 g

25.2 g

11.8 g

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QUESTION 9

It takes 11.2 kJ of energy to raise the temperature of 145 g of benzene from 23.0 oC to 68.0 oC. What is the specific heat of benzene?

5.25 J/(g oC)

1.72 J/(g oC)

1.14 J/(g oC)

3.48 J/(g oC)

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QUESTION 10

Identify a driving force in the following reaction:

    HCl (aq) + Na2CO3(aq) => ________ + _______ + _______

Formation of a precipitate

There is no driving force. This reaction will not occur.

Formation of an insoluble salt

Formation of a nonelectrolyte

More than one correct answer is given.

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QUESTION 11

Of the following, which element has the highest first ionization energy?

P

Na

Al

Cl

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QUESTION 12

How many protons, electrons, and neutrons are in an isotope ofpraseodymium (Pr) that has a mass number of 141?

59 protons, 59 electrons, 84 neutrons

58 protons, 58 electrons, 80 neutrons

No correct answer is given

59 protons, 59 electrons, 82 neutrons

94 protons, 94 electrons, 47 neutrons

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QUESTION 13

The number of cycles that pass through a stationary point is called

amplitude

frequency

median

area

wavelength

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QUESTION 14

The measurement 0.00159 g rounded to two significant figures would be:

0.0016 g

0.019 g

0.002 g

0.0015 g

0.0159 g

49.2 g

16.0 g

5.91 g

25.2 g

11.8 g

Explanation / Answer

1. o2 is less here. so 16 grams of o2 gives 18 gram of h20

it will be 11.8 grams

2 1.72 (mct = heat)

3. Formation of a nonelectrolyte Na2CO3+2HCI=2NaCI+H2O+CO2

4. Cl it increases from left to right

5.59 protons, 59 electrons, 82 neutrons

6. frequency

7. 0.0016 g

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