AP CHEMISTRY EXAM 2 - What mass of water does this bed contain? A. 1....

AP CHEMISTRY EXAM 2

• Suppose that you purchased a water bed with the dimensions 2.55 m x 2.53 dm x 291 cm.

What mass of water does this bed contain?

• 1.88 x 10^3 g
• 1.88 x 10^4 g
• 1.88 x 10^5 g
• 1.88 x 10^8 g

E. 1.88 x 10^6 g: 1.88 x 10^6 g

• A 20.0 mL sample of glycerol has a mass of 25.2 grams. What is the mass of a 63-mL

sample of glycerol?

• 8.0 g
• 50 g
• 3.2 x 10^4 g
• 79 g

E. 79.4 g: 79 g

3. The Greeks proposed that matter consisted of four fundamental sub- stances:

• Fire, earth, water, air
• Fire, metal, water, air
• Earth, metal, water, air
• Atoms, fire, water, air

E. Atoms, metal, fire, air: Fire, earth, water, air

• The first chemist to perform truly quantitative experiments were
• Paracelsus
• Boyle
• Priestly
• Bauer

E. Lavoisier: Boyle

• The scientist who discovered the law of conservation of mass and is also called the father

of modern chemistry is

• Proust
• Boyle
• Priestly
• Bauer

E. Lavoisier: Lavoisier

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• Which of the following pairs can be used to illustrate the law of multiple proportions?
• SO and SO2
• CO and CaCO3
• H2O and C12H11O11
• H2SO4 and H2S

E. KCl and KCLO2: SO and SO2

• A sample of chemical X is found to contain 5.0 grams of oxygen, 10.0 grams of carbon, and

20.0 grams of nitrogen. The law of definite proportion would predict that a 75 gram sample of chemical X should contain how many grams of carbon?

• 5.0 grams
• 7.5 grams
• 10 grams
• 15 grams

E. 21 grams: 21 grams

• Consider the following two compounds: H2O and H2O2. According to the law of multiple

proportions, the ratio of hydrogen atoms per gram of oxygen in H2O to hydrogen atoms per gram of oxygen in H2O2 is

A. 1:1

B. 2:1

C. 1:2

D. 2:2

E. 4:1: 2:1

• How many of the following postulates of Dalton's atomic theory are still scientifically

accepted?

• All atoms of the same element are identical.

II. Compounds are combinations of different atoms.III. A chemical reaction changes the way atoms are group together.IV. Atoms are indestructible.

• 0
• 1
• 2
• 3

E. 4: 2

10. Avogadro's hypothesis states that:

• Each atom of oxygen is 16 times more massive than an atom of hydrogen.
• A given compound always contains exactly the same proportion of ele- ments by mass.
• When two elements form a series of compounds, the ratios of masses that combine with 1
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