Chemistry: Exam 1
The correct decimal representation of 1.201x10^-7 is:
0.0000001201
The exponential 10^-1 is equal to which decimal number?
0.1
How many in^3 are in 2.20cm^3 ?
0.1340
How many liters are in 333 mL?
0.333
What is the density of 83 mL of a liquid that has a mass of 59.8 g?
0.72 g/mL
How many significant digits should be reported in the answer to the following calculation? (4.3 - 3.7) x 12.3 =
1
An object weighing 1.840 kg has a volume of 30.0015 m . What is the density of the object in 3g/cm ?
1.2
What is the volume of a cube with dimensions 11.0 cm x 11.0 cm x 11.0 cm in 3m
1.33x10^-3
What is the density (g/mL) of an object that has a mass of 14.01 grams and, when placed into a graduated cylinder, causes the water level to rise from 25.2 mL to 33.6 mL?
1.7
The distance between the two hydrogen atoms in a molecule of water is 0.000000000172 m. Express this distance in scientific notation
1.72x10^-10 m
How many milliliters are in 17.5 L?
1.75x10^4
The exponential 10^1 is equal to which decimal number?
10
Determine the answer to the following equation with correct number of significant figures: 2.02 + 8.102 - 0.0297 = ________
10.09
How would the number 1.09x10^1 be expressed in decimal form?
10.9
The decimal value 0.001 is equal to which exponential?
10^-3
The decimal value 1,000 is equal to which exponential?
10^3
How many grams are in 1.48x10^7 μg?
14.8
Determine the answer to the following equation with correct number of significant figures: (17.103 + 2.03) x 1.02521 = ________
19.62
Determine the answer for the equation below with correct number of significant figures: 3.215 x 13.2 ÷ 0.218 = ________
195
12) The correct number of significant figures in the number 4.0x10^-2 is:
2
How many significant digits should be reported in the answer to the following calculation? (95.43)(0.0032101)/(0.0090) =
2
How many significant figures should be reported in the answer to the following calculation? (121) x ( 0.86) x ( 4.95687) =
2
Determine the answer for the equation below with correct number of significant figures: 1.2 x 1.79 = ________
2.1
When rounding the number 2.348615 to 5 significant digits, what is the correct value?
2.3486
How many 3cm are there in 2.5 3m
2.5x10^6
What is the volume of 19.6 g of a liquid that has a density of 0.967 g/mL?
20.3mL
Determine the answer to the following equation with correct number of significant figures: 106 ÷ 9.02 x 1.9 = ________
22
The distance from New York City to Washington, DC is approximately 235 miles. Identify the correct solution map to convert from miles to kilometers using the prefix multipliers and the given conversion factors: 1 mile = 5280 ft; 1 ft = 12 in; 1 in = 2.54 cm.
235mile x 5280ft/1mile x 12in/1ft x 2.54cm/1in x 10^-2m/1cm x 1km/10^3m
Determine the answer to the following equation with correct number of significant figures: (4.123 x 0.12) + 24.2 = ________
24.7
In the number 48.93, which digit is estimated?
3
The correct number of significant figures in the number 865,000 is
3
How many significant digits should be reported in the answer to the following calculation? (5.0032) x ( 54.881 + 210.3) =
4
The correct number of significant figures in the number 0.002320 is
4
How many microliters are in 41.0 mL
4.10x10^4
The wavelength of blue light is 0.00000045 m. Express this wavelength in scientific notation
4.5x10^-7
A lead ball has a mass of 55.0 grams and a density of 311.4 g / cm . What is the volume of the ball?
4.82mL
How many significant digits are in the number 2530.3?
5
How many significant digits should be reported in the answer to the following calculation? ( 4.213) + ( 1001.6) =
5
The correct number of significant figures in the number 0.027090 is
5
The correct scientific notation for the number 500.0 is
5.000x10^2
The correct scientific notation for the number 0.00050210 is:
5.0210x10^-4
The correct decimal representation of 6.453x10^3 is:
6,453
How many inches are in 15.3 cm?
6.02
The correct number of significant figures in the number 1.250100 is
7
How would the number 8,155 be written in scientific notation?
8.155x10^3
Determine the answer to the following equation with correct number of significant figures: 13.96 - 4.9102 + 71.5 = ________
80.5
What is the difference between a scientific law and a scientific theory?
A statement based on a number of similar observations that may predict future outcomes of similar experiments is a scientific law. Laws are subject to further experiments and may be proven wrong or be validated. Theories are models of the way nature behaves, and are the products of several well-established and tested scientific laws.
What is chemistry?
Chemistry is branch of science that explains the properties and behavior of different forms of matter, in the broadest sense, by helping us understand the atoms and molecules that compose them.
Charcoal was burned in a barbecue grill. The ashes that remained weighed considerably less than the charcoal that was burned. Does this mean that the law of conservation of mass is wrong? Explain.
No. The gaseous products formed during the combustion of charcoal escaped into the air and are not accounted for. If all those products could have been collected and weighed along with the ashes, the total mass of the products would have been equal to the mass of the charcoal.
What are the important characteristics of the scientific method?
The important characteristics of the scientific method include the observation of phenomena, the formulation of a hypothesis to explain the observed phenomena, the testing of the hypothesis by experiment, and the formulation of laws and theories.
How would you classify sugar? A) pure substance-compound B) mixture-heterogeneous C) pure substance-element D) mixture-homogeneous E) none of the above
a
The correct multiplier for the prefix milli is: A)10^-3 B) 10^-6 C) 10^-9 D) 10^-12 E) none of the above
a
The correct prefix for the multiplier 1,000,000 is: A) mega. B) milli. C) micro. D) nano. E) none of the above
a
The prefix kilo represents which multiplier? A) 1,000 B) 0.001 C) 0.0001 D) 1,000,000 E) none of the above
a
What is the standard SI unit for mass? A) kilogram B) gram C) pound D) ton E) none of the above
a
Which of the following statements is NOT part of the rules for determining significant figures? A) Non-zero digits at the end of a number are not significant. B) Zeroes between two numbers are significant. C) Zeroes to the left of the first non-zero number are not significant. D) Zeroes at the end of a number, but before a decimal are ambiguous. E) All of the above statements are part of the rules
a
Which state of matter has atomic spacing that is close together and indefinite shape? A) liquid B) solid C) gas D) plasma E) none of the above
a
A pure substance is: A) composed of two or more different types of atoms or molecules combined in variable proportions. B) composed of only one type of atom or molecule. C) composed of two or more regions with different compositions. D) composed of two or more different types of atoms or molecules that has constant composition. E) none of the above
b
A sample of wood with a mass of 3.0 grams was burned in an open dish. The ashes weighed 1.2 grams. What happened to the rest of the wood? A) The remaining mass was destroyed. B) The remaining 1.8 grams was converted into gaseous compounds. C) Nothing, the burned wood simply has a mass of 1.2 grams. D) The remaining 1.8 grams was converted into heat. E) none of the above
b
An American nickel five cent coin has a mass of approximately 5 grams. Five grams is equivalent to which term? A) 5000 kilograms B) 5000 milligrams C) 50 centigrams D) 5000 micrograms E) none of the above
b
How would you classify raisin bran? A) pure substance-compound B) mixture-heterogeneous C) pure substance-element D) mixture-homogeneous E) none of the above
b
The correct multiplier for the prefix micro is: A)10^-3 B) 10^-6 C) 10^-9 D) 10^-12 E) none of the above
b
The correct prefix for the multiplier 0.1 is: A) tera. B) deci. C) femto. D) pico. E) none of the above
b
The standard SI unit for temperature is: A) Fahrenheit. B) Kelvin. C) Celsius. D) atmospheres. E) none of the above.
b
Which of the following is a homogeneous mixture? A) trail mix B) stainless steel C) water D) molten iron E) none of the above
b
Which of the following is an example of a scientific law? A) All matter is composed of small, indestructible particles called atoms. B) In a chemical reaction, matter is neither created nor destroyed. C) When a can of soda pop is opened, a fizzing sound is heard. D) Flammable objects contain phlogiston. E) none of the above
b
Which of the following items is a physical property? A) the corrosive action of acid rain on granite B) the odor of spearmint gum C) the combustion of gasoline D) the tarnishing of a copper statue E) none of the above
b
Which state of matter has atomic spacing that is close together and definite shape? A) liquid B) solid C) gas D) plasma E) none of the above
b
Who discovered the law of conservation of mass? A) John Dalton B) Antoine Lavoisier C) Nivaldo Tro D) John Dalton and Antoine Lavoisier E) none of the above
b
A plastic block has dimensions of 2.2 cm x 3.0 cm x 1.5 cm and a mass of 12.4 grams. Will the block float in water 9 (d= 0.99 g/mL)and why? A) Yes, because the density of the block is 1.3 g/mL which is less than the density of water. B) Yes, because the density of the block is 0.80 g/mL which is less than the density of water. C) No, because the density of the block is 1.3 g/mL which is greater than the density of water. D) No, because the density of the block is 0.80 g/mL which is greater than the density of water. E) none of the above
c
Physical properties are: A) those that a substance displays only 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 the above
c
The correct prefix for the multiplier 0.000001 is: A) mega. B) milli. C) micro. D) nano. E) none of the above
c
The multiplier 0.001 is represented by which prefix? A) kilo- B) centi- C) milli- D) deci- E) none of the above
c
What term best describes a brief statement that synthesizes many past observations and predicts new ones? A) experiment B) hypothesis C) scientific law D) theory E) none of the above
c
Which of the following is a heterogenous mixture? A) salt water B) sugar water C) raisin bran D) air E) none of the above
c
Which of the following is an example of an observation? A) All matter is composed of small, indestructible particles called atoms. B) Reactions occur due to the transfer of electrons. C) When a can of soda pop is opened, a fizzing sound is heard. D) Flammable objects contain phlogiston. E) none of the above
c
Which of the following items is a mixture? A) water B) helium C) brass D) sugar E) none of the above
c
Which of the following statements about compounds is TRUE? A) A substance that cannot be broken down into simpler substances. B) A pure substance that has variable composition throughout. C) A substance composed of two or more elements in fixed, definite proportions. D) A substance that is not as common as pure elements. E) none of the above
c
Which of the following statements about soda pop is FALSE? A) Soda pop is a chemical mixture of mostly sugar, water and carbon dioxide. B) The molecules important to fizzing are carbon dioxide and water. C) The carbon dioxide is forced to mix with the water by the presence of sugars. D) When a can is opened, the pressure release allows carbon dioxide to form bubbles. E) All of the above statements are true.
c
Which state of matter has indefinite shape and is compressible? A) liquid B) solid C) gas D) plasma E) none of the above
c
Which statement about the scientific method is TRUE? A) The scientific method emphasizes reason as the way to understand the world. B) The scientific method emphasizes observation and reason as the way to understand the world. C) The scientific method emphasizes observation and experimentation as the way to understand the world. D) The scientific method emphasizes scientific laws as the way to understand the world. E) All of the above statements are false.
c
the science that seeks to understand what matter does by studying what atoms and molecules do
chemistry
A solution is an example of a (an) A) pure substance B) element C) compound D) homogeneous mixture E) heterogeneous mixture
d
How would you classify salt water? A) pure substance-compound B) mixture-heterogeneous C) pure substance-element D) mixture-homogeneous E) none of the above
d
What is the standard SI unit for length? A) mile B) centimeter C) foot D) meter E) none of the above
d
Which of the following items is a chemical property? A) the paint color on a new red Corvette B) the odor of spearmint gum C) the melting and boiling point D) the tarnishing of a copper statue E) none of the above
d
Which of the following items is a pure substance? A) air B) seawater C) brass D) ice E) none of the above
d
Which of the following sets of units is not in the order of increasing size? A) μg < g < kg B) mL < dL < L C) ns < ms < s D) cm < μm < km E) μmol < mmol < mol
d
Which of the following statements about matter is FALSE? A) Matter occupies space and has mass. B) Matter exists in either a solid, liquid or gas state. C) Matter is ultimately composed of atoms. D) Matter is smooth and continuous. E) none of the above
d
Which statement accurately describes the purpose of experiments? A) Experiments are designed to produce the results predicted by a theory. B) Experiments can be replaced by a simple, logical reasoning of known facts. C) Experiments are designed to produce unexplainable results for further investigation. D) Experiments look for other observable predictions of a theory. E) none of the above
d
A popular science demonstration is to take several liquids that will not mix together and "stack" these liquids in a tall glass cylinder. Suppose the following three liquids were placed in the same tall, narrow glass cylinder: SUBSTANCE DENSITY g/mL vinegar 1.01 motor oil 0.87 corn syrup 1.36 These liquids would stack in which order? A) corn syrup on top, motor oil in the middle, vinegar on the bottom B) vinegar on top, motor oil in the middle, corn syrup on the bottom C) motor oil on top, corn syrup in the middle, vinegar on the bottom D) corn syrup on top, vinegar in the middle, motor oil on the bottom E) motor oil on top, vinegar in the middle, corn syrup on the bottom
e
The correct prefix for the multiplier 1,000 is: A) mega. B) milli. C) micro. D) nano. E) none of the above
e
Which among the following statements is false? A) A solid has a definite shape and a definite volume. B) A liquid has a definite volume; but it has no definite shape. C) A gas has neither definite volume nor definite shape. D) Both solids and liquids are incompressible while gases are compressible. E) none of the above
e
Which of the following items does not contain chemicals? A) drain cleaner B) organically grown vegetables C) air D) insecticides E) All of the above contain chemicals
e
Which of the following statements is FALSE? A) Matter may be a pure substance or it may be a mixture. B) A pure substance may either be an element or a compound. C) A mixture may be either homogeneous or heterogeneous. D) Mixtures may be composed of two or more elements, two or more compounds, or a combination of both. E) All of the above statements are true.
e
Which of the statements below is NOTpart of the scientific method? A) observation and measurement B) formation of a hypothesis C) testing of a hypothesis by experimentation D) refinement of a hypothesis as needed E) All of the above steps are part of the scientific method
e
Which statement about a hypothesis is TRUE? A) It is a tentative interpretation or explanation. B) It has the potential to be proven wrong. C) It can be tested by experiments. D) It is part of the scientific method. E) All of the above statements are true
e
There are exactly 2.54 centimeters in 1 inch. When using this conversion factor, how many significant figures are you limited to?
infinite number of significant figures
a number of similar observations generalized into a brief statement summarizing past observations and predicting new ones
scientific law
a model that explains the underlying reasons for observations and laws
scientific theory
