Chemistry Test1

A fictitious unit of length called the "zither" is defined by the relationship 7.50 cm= 1 zither. a 100.0 m distance would be equivalent to ______ zithers.

1333 zithers

A steel cylinder has a volume of 246 cm^3 and density of 7.93g/cm^3. Find the mass of the cylinder

1950.78g

Convert a temperature of 132 degrees Celsius to Fahrenheit

269.6 degrees celsius

The transformation of a solid directly into a gas is known as

sublimation

A 375 g sample of methylene chloride has a density of 1.326 g/cm^3. Calculate the volume.

282.9cm^3

Explain, using complete sentences, the different between precision and accuracy.

Accuracy refers to the closer of a measurement to the true value Precision refers to the closeness of a set of measurements to each other.

Glancing over a students laboratory notebook, you notice that he recorded a temperature for a particular experiment of -35K. Is there anything wrong with this temperature? Why or Why not?

There are no negative Kelvin temperatures

Perform the following calculations and report your anwsers to the correct number of significant figures: A. (4.3x10^-3)(4.246x10^-5) B. 12.45g-34.4569g+87.9g

a. 1.82578x10^-7 b. 65.4931g =65.5g

How many significant figures are in the each of the following numbers? a. 0.028 b. 3.400 c. 8.101 d. 3500 e. 0.00520 f. 3.24x10^4

a. 2 b. 4 c. 4 d. 2 e. 3 f. 3

Make the following conversions a. 1 year to MSeconds b. 300 iles to meters c. 25.9mL to gallons d. 1.36x10^-8 ug to mg e. 2.88x10^-21 cm to km f. 1,344,000 ug to ng

a. 31.5 Msec b. 482926.8m c. 0.00686 gal d. 1.36x10^-11mg e. 2.88x10^-26km f. 1.344x10^9mg

Classify each of the following as either intensive or extensive properties a. density b. mass c. temperature d. volume

a. and c. are intensive properties

A football field is 100 yards long. What is the length in meters? a. 0.09144 m b. 91.5m c. 274.32 m d. 334 m e. 9144 m

b. 91.5m

The process in which a gas forms a solid without passing through the liquid phase is called_________. a. sublimation b. deposition c. melting d. freexing e. evaporation

b. deposition

Matter is defined as anything visible to the human eye. a. True b. False

b. false

You do not need to write down units of a calculation, as long as you can remember them. a. True b. False

b. false

Classify each of the following properties as physical or chemical. a. the normal color of the elemental sulfur is yellow b. hydrogen can explode when ignited in air. c. copper metal can vary easily be rolled into a thin wire. d. a boiling pot of water evaporates e. sugar dissolves in water.

b. hydrogen can explode when ignited in air

Which state of matter has a fixed volume but not shape? a. solid b. liquid c. gas d. all of these e. none of these

b. liquid

A substance composed of two or more different elements in fixed proportions is called a(n)__________ a. atom b. element c. compund d. ion e. mixture

c. compound

Physical properties are ______. a. those that a substance displays through changing its composition b. those that cause atoms and molecules to change c. those that a substance displays without changing its composition d. identical for all solid matter e. none of these

c. those that a substance displays without changing its composition

The term used for a fraction that expresses the same number but in different units is _______.

conversion factor

Select the answer that expresses the result to this calculation with the correct number of significant figures. (13.602)(1.90)(30.6)/(4.2)(1.4097) a. 13.357 b. 13.36 c. 13.4 d. 13 e. 14

d. 13

Which of the following is a chemical property? a. water vaporizes b. wax melts c. water vapor condenses to rainfall d. a steak is broiled on a grill e. none of these

d. a steak is broiled on

Which of the following is the correct scientific notation for 6000220 when rounded to three significant figures? a. 6.1 x 10^-5 b. 6.00 x 10^-5 c. 60.1 x 10^ 6 d. 6.01 x 10^-6 e. 6.00 x 10^6

e. 6.00x10^6

Matter is __________________. a. anything that chemist use b. a liquid with interesting properties c. used as rocket fuel d. anything that has a specific volume e. anything that has mass and takes up space

e. anything that has mass and takes up space

A garden salad with onion, tomatoes, carrots and green peppers would be an example of a(n) a. pure substance b. theory c. conclusion d. prediction e. hypothesis

e. hypothesis

A(n) _____________ is a tentative explanation of a scientific observation. a. law b. theory c. conclusion d. prediction e. hypothesis

e. hypothesis