Chemistry Cumulative Final Exam

Acetic acid boils at 244.2 F. What is it's boiling point in degrees Celsius?

117.9 C

What is the best answer to report for: (4.416 g + 7.656 g)/4.79 mL + 0.380 g/mL

2.91 g/ml

A piece of metal (mass 18.3 g) is placed in 11.0 mL of chloroform in a 25-mL graduated cylinder. The chloroform level increases to 15.46 mL. The best value for density of this metal from this data is:

4.10 g/mL

The state of matter for an object that has a definite volume but not a definite shape is:

liquid state

The state of matter that has both definite volume and definite shape is:

solid state

A sample of magnesium oxide is burned in oxygen to form magnesium oxide. What mass of oxygen is consumed if 74.62 g magnesium oxide is formed from 45.00 g magnesium?

29.62 g

Which of the following is not a postulate of Dalton's atomic theory? 1. Atoms combine in fixed ratios of whole numbers. 2. Atoms of each element have different properties. 3. Elements occur as solids, liquids, or gases.

3

Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4 C. What is the boiling point in Kelvins?

355.6 K

A large pizza has a diameter of 15 inches. Express this diameter in centimeters.

38 cm

Convert 4471 mL to qt. (1 L = 1.06 qt.)

4.739 qt

It is estimated that uranium is relatively common in the earth's crust, occuring in amounts of 4g/metric ton. A metric ton is 1000 kg. At this concentration, what mass of uranium is present in 2.0 mg of the earth's crust?

8 mg/mt

Explain the difference between a hypothesis and a theory.

A hypothesis is an observation of something to be tested. A theory is an explanation of something that has been tested.

Express the number 0.000779 in scientific notation. A. 779x10^-6 B. 7.79x10^2 C. 7.79x10^4 D. 7.79x10^-4

D. 7.79x10^-4

J.J. Thomson reasoned that cathode rays were really charged particles because: A. a magnet deflected cathode rays. B. cathode rays form only when the air was pumped out of a discharge tube. C. the properties of the cathode rays depended on the cathode material. D. the cathode rays were attracted to the anode.

A. a magnet deflected cathode rays.

Using the rules of significant figures calculate the following: 4.0021-1.779 A. 2 B. 2.223 C. 2.2 D. 2.22

B. 2.223

7.6 kilograms contains this many grams? A. 7.6x10^2 B. 7.6x10^3 C. 76 D. 0.76

B. 7.6x10^3

As part of the calibration of a new laboratory balance, a 1.000 g mass is weighed with the following results: Trial Mass 1 1.201 (+-) 0.001 2 1.202 (+-) 0.001 3 1.200 (+-) 0.001 The balance is: A. Both accurate and precise B. Accurate but imprecise C. Precise but inaccurate D. Both inaccurate and imprecise

C. precise but inaccurate.

The degree of agreement among several measurements of the same quantity is called _________. It reflects the reproducibility of a given type of measurement. A. accuracy B. error C. precision D. significance

C. precision

A scientist obtains the number 0.045006700 on a calculator. If this number actually has four significant figures, how should it be written? A. 0.4567 B. 0.4501 C. 0.450 D. 0.04501

D. 0.04501

Select the answer that expresses the result of this calculation with the correct number of significant figures. (13.602x1.90x3.06)/(4.2x1.4097) A. 13.357 B. 13.36 C. 13.4 D. 13

D. 13

Convert 0.2924 m to mm: A. 2.924x10^-3 mm B.2.924x10^-4 mm C. 0.02924 mm D. 292.4 mm

D. 292.4 mm

Which one of the following statements about atomic structure is false? A. An atom is mostly empty space. B. Almost all of the mass of the atom is concentrated in the nucleus. C. The protons and neutrons in the nucleus are very tightly packed. D. The number of protons and neutrons are always the same in a neutral atom.

D. The number of protons and neutrons are always the same in a neutral atom.

Which of the following is an example of a quantitative observation? A. The piece of metal is longer than the piece of wood. B. Solution 1 is much darker than solution 2. C. The liquid in beaker A is blue. D. The temperature of the liquid is 60 C.

D. The temperature of the liquid is 60 C.

In addition to mass, which property of matter must be known to calculate its volume? A. pressure B. temperature C. molecular weight D. density

D. density

A metric unit for length is: A. gram B. milliliter C. yard D. kilometer

D. kilometer

What is the law of conservation of mass?

Matter can neither be created nor destroyed.

The symbol for tin is:

Sn

A sample that cannot be separated into two or more substances by physical means is:

a pure substance