1. which of the following amounts is closest to the molar mass C8H10N4O2? a) 200

Question

1. which of the following amounts is closest to the molar mass C8H10N4O2?

a) 200g

b) 1.30 lbs

c) 1.9419 kg

d) 128.44g

2. Two bowling balls, each with a positive charge of 2.5 X 10^-5 C are located 28 cm apart. The size of the electric force between them is ___ N?

3. A rock mass of 8.00 kg is dropped from a stationary hot air ballon. Its potential energy at the top is 18,000 J. When its potential energy is 10,000 J, the rock is falling at ________ m/s.

4. The specific heat of a particular metal alloy is 0.20 calories per gram per degree Celsius. Calculate the amount of heat required (in calories) to raise the temperature of 4.3 kg of this material by 16 degrees.

5. A water wave oscillates up and down once every 3.50 seconds. The distance between wave crests is 3.60 m. The speed of this wave is ______ m/s.

6. An isotope of the element Thallium, Tl-206, undergoes beta decay with half-life of 3.1 minutes. Assume you begin with 72.00 grams of the thallium isotope, what mass of the isotope will be left after 9.3 minutes have elapsed.

7. Assume that a 19.0 volt energy source is in a circuit that has resistance of 3.00 ohms. Determine the power consumption in watts.

8. A solution has a hydroxide-ion concentration of 1.0x10^-9 mol per liter. What is the pH of this solution?

9. The number of people this planet can support is largely determined by the amount of ammonia-based fertilizer that can be produced. Without the ability to chemically manufacture ammonia, the world

Explanation / Answer

1)

a) 200g

2)

71.747N

3)

44.72m/s

4)

13760

5)

1.028m/s

6)

9 g

7)

120.33W

8)

pH = 5

9)

34g

10)

430.257m

11)

5.8 m/s^2

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