chem exam 1

The prefix micro means ________. A)10-9 B)10-6 C)10-3 D)103

10^-6

The density of lead is 11.3 g/cm3. What mass of lead is required to make a 1.00 cm3 fishing sinker? A)1.00 g B)1.13 g C)11.3 g D)113 g

11.3 g

The melting point of fluorine, F, is -220°C. What is this temperature on the Kelvin scale? A)320 K B)120K C)493 K D)53 K

53 K

What is the name of the element with the symbol Au? A)silver B)gold C)plutonium D)nickel

gold

Which of these does NOT involve a chemical change? A)Cocaine causes the release of norepinephrine from nerve cells. B)Red delicious apples taste sweet. C)Antacids often help an upset stomach. D)Mercury is used in barometers because it has a high density.

mercury is used in barometers because it has a high density

What is the name of the element with the symbol Ag? A)silver B)gold C)mercury D)antimony

silver

A scientific hypothesis is A)explanatory. B)predictive. C)testable. D)all of the above.

testable

The symbol for the prefix micro is ________. A)M B)m C)mm D)μ

μ

Which of the following could NOT be the temperature of a solid? A)2°C B)2 K C)-2°C D)-2 K

-2 K

The prefix milli means ________. A)0.000001 B)0.001 C)0.1 D)1000

0.001

The prefix deci means ________. A)0.001 B)0.1 C)0.01 D)100

0.1

How many meters are in 10.0 cm? A)0.0100 B)0.100 C)1.00 D)1,000

0.100

A tablet contains 325.0 mg of the active ingredient. This mass may also be expressed as A)325.0 μg. B)0.0003250 g. C)0.3250 g. D)32.50 μg.

0.3250 g.

How many kilometers are in 800 m? A)0.008 B)0.08 C)0.8 D)800

0.8

A student measures 10.5 g of mercury(II) oxide into an open test tube and heats the tube. The heat causes the mercury(II) oxide to decompose into mercury and oxygen. After reaction, the student finds the mass of the contents of the tube to be 9.7 g. Which one of the following describes these observations? (study this****) A)The decomposition of mercury(II) oxide does not obey the Law of Conservation of Mass. B)0.8 grams of oxygen gas are lost from the tube. C)There are errors associated with the student's measurements. D)Heating destroys some mass.

0.8 grams of oxygen gas are lost from the tube

The freezing point of water on the Celsius temperature scale is A)-32°C. B)0°C. C)100°C. D)212°C.

0°C.

Which of the following is equal to 1 mL? A)1 cm3 B)1000 cm3 C)1 dm3 D)0.01 L don't have to know this

1 cm^3

The prefix giga means ________. A)1,000 B)1,000,000,000,000 C)1,000,000 D)1,000,000,000

1,000,000,000

The boiling point of water on the Celsius temperature scale is A)100°C. B)212°C. C)273°C. D)373°C.

100°C

The prefix centi means ________. A)10-3 B)10-2 C)10-1 D)102

10^-2

The prefix nano means ________. A)103 B)10-9 C)106 D)109

10^-9

The prefix kilo means ________. A)10-9 B)10-6 C)10-3 D)103

10^3

The prefix mega means ________. A)10-6 B)10-3 C)103 D)106

10^6

32 g of sulfur will react with 48 g of oxygen to produce 80 g of sulfur trioxide. If 16 g of sulfur and 100 g of oxygen are placed into a sealed container and allowed to react, what is the mass of the material in the container after the reaction is completed? (study this**) A)40 g B)16 g C)100 g D)116 g

116 g

The density of mercury is 13.6 g/cm3. What approximate mass of mercury is required to fill a 4.0 ounce bottle? An ounce is approximately 30 cm3. A)1632 g B)540 g C)53 g D)2 g

1632 g

What is the density of a liquid that has a volume of 10.0 mL and a mass of 22.00 grams? A)0.220 g/mL B)0.460 g/mL C)2.20 g/mL D)4.60 g/mL

2.20 g/mL

The density of gold is 19.3 g/cm3. What is the volume of a 50.00 g gold ingot? A)0.5000 cm3 B)2.593 cm3 C)50.00 cm3 D)965.0 cm3

2.593 cm^3

How many micrograms are in 20 mg? A)20,000 μg B)200,000 μg C)2,000,000 μg D)2.0 μg

20,000 μg

The melting point of a compound is 2400 K. What is this temperature on the Celsius scale? A)2673°C B)2300°C C)2188°C D)2127°C

2127°C

A mixture containing 50 grams of carbon and 75 grams of oxygen is sealed in a flask. The total mass of the system is 225 grams. The flask is heated to cause the carbon and oxygen to react. The sealed flask is massed. What is the mass of the sealed flask? (study this****) A)125 grams B)150 grams C)175 grams D)225 grams

225 grams

The freezing point of water on the Kelvin temperature scale is A)0 K. B)100 K. C)273 K. D)373 K.

273 K

A student working in the laboratory needs 200.0 g of a liquid chemical whose density is 0.690 g/cm3. What volume of this liquid should he measure? A)138 cm3 B)69.0 cm3 C)200. cm3 D)290 cm3

290 cm^3

The boiling point of water on the Kelvin temperature scale is A)0 K. B)100 K. C)273 K. D)373 K.

373 K

A train robber in a western movie steals two gold ingots, each of which has a volume of 1000. cm3. The density of gold is 19.3 g/cm3. What is the massof the two ingots? A)38.6 g B)19,300 g C)38,600 g D)104 g

38,600 g

32 g of sulfur will react with 48 g of oxygen to produce 80 g of sulfur trioxide. If 16 g of sulfur and 100 g of oxygen are placed into a sealed container and allowed to react, what is the mass of sulfur trioxide in the container after the reaction is completed? (study this***) A)40 g B)16 g C)100 g D)116 g

40 g

The boiling point of a liquid is 178°C. What is this temperature on the Kelvin scale? A)451 K B)95 K C)178 K D)-95 K

451 K

The density of a certain type of steel is 8.1 g/cm3. What is the massof a 100.0 cm3 chunk of this steel? A)0.08100 g B)8.100 g C)12.00 g D)810.0 g

810.0 g

Which of the following can be broken down into simpler substances? A)CO B)Se C)Mg D)F

CO

Which of the following represents a compound? A)Co B)Mn C)CO2 D)Na

CO2

What is the chemical symbol for chromium? A)C B)Cr C)Ch D)Cm

Cr

________ was the first person to propose a consistent "modern" atomic theory. A)Dalton B)Democritus C)Proust D)Lavoisier

Dalton

What is the chemical symbol for iron? A)Fe B)I C)In D)Ir

Fe

Which of the following CANNOT be the chemical symbol for an element? A)Ca B)Se C)B D)H2

H2

What is the chemical symbol for iodine? A)I B)Id C)In D)Io

I

What is the chemical symbol for potassium? A)P B)Po C)Pu D)K

K

The SI unit for temperature is the A)Calorie. B)Celsius. C)Fahrenheit. D)Kelvin.

Kelvin

The symbol for the prefix mega is ________. A)M B)m C)mm D)μ

M

What is the chemical symbol for sodium? A)Na B)K C)S D)Sm

Na

Which of the following represents an element? A)HF B)Se C)F2 D)CO2

Se

The label on a bottle of shampoo lists many ingredients, such as water, sodium laureth sulfate, lauramide DEA, sodium chloride, etc. From this information, shampoo is best classified as A)a pure substance. B)an element. C)a compound. D)a mixture.

a mixture

The species represented by CO is A)an atom of cobalt. B)an atom made up of carbon and oxygen. C)a molecule of cobalt. D)a molecule made up of carbon and oxygen.

a molecule made up of carbon and oxygen

Which of the following variables would be the easiest to control? A)atmospheric air pressure B)a teenager's diet C)amount of antibiotic added to a bacterial culture D)political opinion

amount of antibiotic added to a bacterial culture

Joe conducts an experiment to test the effectiveness of a new drug for cancer. Which of the following variables would be easiest to control? A)amount of drug administered B)patient's diet C)exposure to air pollution D)exposure to other people

amount of drug administered

A biochemist is hired by a pharmaceutical firm to synthesize a medical remedy for cancer. This person is engaged in A)applied research. B)basic research. C)natural speculation. D)medical technology.

applied research

A chemist employed by an airplane manufacturer investigates new adhesives for the purpose of building airplanes without rivets. She is engaged in A)alchemy. B)applied research. C)basic research. D)risk-benefit analysis.

applied research

Which of the following parts (postulates) of Dalton's atomic theory has been modified in light of later discoveries? A)All matter is made up of very small particles called atoms. B)Atoms are indivisible. C)Chemical reactions involve rearrangement of atoms. D)Compounds are formed from atoms.

atoms are indivisible

Which of the following statements about basic research is NOT correct? A)Basic research is conducted primarily in universities and research institutes. B)The results of basic research are often used as the basis for technological advances. C)Basic research is carried out to develop a particular product. D)Basic research is the search for knowledge for its own sake.

basic research is carried out to develop a particular product

Methane can be decomposed into two simpler substances, hydrogen and carbon. Therefore, methane A)is a solid. B)cannot be an element. C)must be a mixture. D)must have the formula CH2.

cannot be an element

Which science is primarily concerned with the study of matter and the changes it undergoes? A)biology B)chemistry C)geology D)physics

chemistry

A chemical change always involves a change in the ________ of matter. A)state B)composition C)volume D)temperature

composition

By definition, which of the following can be broken down into simpler substances? A)compound B)atom|ion C)solid D)liquid

compound

Refined white table sugar is usually derived from either sugar cane or sugar beets. Irrespective of the source of table sugar, after refining it always has the same composition of carbon, hydrogen and oxygen. Sugar is best classified as which one of the following? A)ideal mixture B)element C)compound D)mixture

compound

A substance that cannot be broken down by chemical means into simpler substances is called a(n) A)solid. B)element. C)compound. D)mixture.

element

________ are pure substances. A)Homogeneous mixtures and elements B)Elements and compounds C)Heterogeneous mixtures and compounds D)Homogeneous and heterogeneous compounds

elements and compounds

Scientific results must be verified by A)constructing plausible theories. B)consulting noted scientific authorities. C)further experiment. D)government agencies

further experiment

A mixture of sand and salt is a(n) A)element. B)heterogeneous mixture. C)homogeneous mixture. D)molecule.

heterogeneous mixture

After a yellow solid is dissolved in water, the liquid appears to be uniformly yellow throughout. This yellow liquid is best classified as a(n) A)compound. B)heterogeneous mixture. C)homogeneous mixture. D)ideal mixture.

homogeneous mixture

Kim Chemist proposes that increasing the proportion of butadiene in her glue formulation will make the glue stickier. Her proposal is called a(n) A)theory. B)experiment. C)law. D)hypothesis.

hypothesis

Which of the following is a physicalchange? A)Carbon combines with oxygen to form carbon dioxide. B)Ice melts at 0°C. C)A red substance is decomposed by heat to form mercury and oxygen. D)Water is decomposed by electricity into hydrogen and oxygen.

ice melts at 0°C

A gas is characterized by a(n) A)definite shape and definite volume. B)definite shape and indefinite volume. C)indefinite shape and definite volume. D)indefinite shape and indefinite volume.

indefinite shape and indefinite volume

Which of the following variables can be most easily controlled? A)blood pressure B)diet C)humidity D)indoor temperature

indoor temperature

A variable A)does not change over the course of the experiment. B)is something that can change over the course of an experiment. C)does not affect the outcome of an experiment. D)can be controlled.

is something that can change over the course of an experiment

Which of the following is NOT true for a scientific law? A)It summarizes observed scientific data. B)It is often stated in mathematical terms. C)It explains observed scientific data. D)It is universal and will hold everywhere under the stated conditions.

it explains observed scientific data

In the SI system of measurement the unit of mass is the A)kilogram. B)kilometer. C)liter. D)yard.

kilogram

The "father of modern chemistry" is A)Boyle. B)Lavoisier. C)Mendeleev. D)Proust.

lavoisier

Methapyrilene, once an active ingredient in certain over-the-counter sleeping pills, was found to be a potent carcinogen (a substance that causes cancer). The pills were also found to be about as effective as placebos in promoting sleep. The desirability quotient (DQ) for methapyrilene is A)low. B)moderate. C)high. D)uncertain.

low

Mass is a better measure of the amount of matter than weight is because A)mass is dependent upon location. B)mass is independent of location. C)mass is easier to measure. D)mass is measured using the metric system.

mass is independent of location

Green chemistry uses A)only water as a solvent B)materials and processes that are intended to prevent or reduce pollution at its source. C)only grocery store bought chemicals. D)reactions that are not heated.

materials and processes that are intended to prevent

Leucippus and Democritus believed that all of the following statements about matter were true EXCEPT A)Matter was made up of atoms. B)Each type of matter had a distinctive size and shape. C)Matter was continuous. D)Substances are mixtures of different kinds of atoms.

matter was continuous

The ancient Greeks believed that matter was composed of four basic elements. Which one of the following wasNOT one of the four? A)mercury B)air C)water D)earth

mercury

What is the name of the element with the symbol Hg? A)silver B)gold C)mercury D)antimony

mercury

In the SI system of measurement, the unit of length is the A)kilogram. B)meter. C)liter. D)yard.

meter

Molasses is a by-product of the refining of sugar from sugar cane. The specific composition of molasses varies depending upon the source of the sugar cane. Which one of the following is the best classification of molasses? A)pure substance B)element C)compound D)mixture

mixture

The label on a can of sparkling mineral water lists the following ingredients: carbonated water and natural lime flavor. Which one of the following best classifies the beverage? A)mixture B)element C)compound D)pure substance

mixture

Vinegar is composed of approximately 5% acetic acid and 95% water. Which one of the following is the best classification of vinegar? A)pure substance B)element C)compound D)mixture

mixture

Tangible items or pictures used by scientists to represent invisible processes are called A)theories. B)models. C)laws. D)experiments.

models

Leucippus and Democritus proposed the "first" atomic view of matter. They arrived at this view based on A)many experiments. B)careful measurements. C)philosophical and intuitive speculation. D)All of the above contributed to their atomic view.

philosophical and intuitive speculation

Which of the following is a chemical property? A)Potassium reacts with water to form potassium hydroxide. B)Sugar dissolves in water. C)Sugar is a solid at room temperature. D)Gasoline and water do not mix.

potassium reacts with water to form potassium hydroxide

A brief statement summarizing many observations of a physical phenomenon is called a A)scientific theory. B)hypothesis. C)fact. D)scientific law.

scientific law

Which of these is a chemical change? A)The hair stylist cuts your hair. B)Bleaching powder dissolves in water. C)Silkworms convert mulberry leaves into silk. D)Wool is spun into yarn.

silkworms convert mulberry leaves into milk

The physical state that retains both shape and volume is A)solid. B)liquid. C)gas. D)element.

solid

________ chemistry is designed to meet the needs of the present generation without compromising the needs of future generations. A)Experimental B)Green C)Organic D)Sustainable

sustainable

A scientific hypothesis is A)absolute. B)complex. C)simple. D)tentative.

tentative

Hydrogen peroxide decomposes into water and oxygen when exposed to heat or light. A tightly capped bottle of hydrogen peroxide is placed on a mass scale (a balance) and exposed to light for three weeks. The mass reading on the scale does not change. This is an example of A)the Law of Conservation of Mass. B)the Law of Definite Proportions. C)the Law of Constant Composition. D)the Law of Multiple Proportions.

the law of conservation of mass

Which one of the following statements is NOT a correct statement of the Law of Conservation of Mass? A)The mass of a system is dependent upon chemical reactions that may occur. B)The mass of a system is conserved in a chemical reaction. C)Matter cannot be created or destroyed. D)Atoms are conserved in chemical reactions.

the mass of a system in dependent upon chemical reactions that may occur

Mass is A)the measure of the amount of space that matter occupies. B)the measure of the amount of matter. C)the measure of the force of gravity on matter. D)the measure of the volume of matter.

the measure of the amount of matter

Which of the following was NOT a result of alchemy? A)The philosopher's stone was successfully used to change base metals, such as lead, into gold. B)Many new chemicals were discovered. C)Alchemists developed techniques such as distillation and extraction that are still used today. D)Many modern chemists inherited an interest in health and medicines from the alchemists.

the philosopher's stone was successfully used to change base metals, such as lead, into gold

Chemistry is A)the mystical search for the elixir of life. B)the study of matter and the changes it undergoes. C)speculation about the nature of matter. D)none of these

the study of matter and the changes it undergoes

The Greek word atomos means A)atom. B)uncuttable. C)invisible. D)continuous.

uncuttable

A mixture of iron, salt and sand can be separated using a magnet, water, a filter and a hot plate. Think about this separation. The separation of this mixture A)uses only physical changes or processes. B)uses only chemical changes or processes. C)uses both chemical and physical changes or processes. D)cannot be done with the materials listed.

uses only physical changes or processes