Chemistry

How many different elements are in the compound C6H12O6? A. 3 B. 24 C. 6 D. All of the elements are the same.

A. 3

If you have two molecules of TiO2, how many oxygen atoms would you have? A. 4 B. 3 C. 2 D. 6 E. none

A. 4

How many atoms of Oxygen (O) are in H3OClO4 A. 5 B. 2 C. 7 D. 3 E. 1

A. 5

Oxygen atoms are used to make water molecules. Does this mean that oxygen, O2, and water, H2O, have similar properties? A. No, compounds are uniquely different from the elements from which they're made. B. Yes, and this explains how fish are able to breathe water. C. Yes, but that their properties are similar is only a coincidence. D. No, but their similar properties are only a coincidence.

A. No, compounds are uniquely different from the elements from which they're made.

Oxygen, O2, is certainly good for you. Does it follow that if small amounts of oxygen are good for you then large amounts of oxygen would be especially good for you? A. No. Breathing 100% oxygen for extended periods of time can be damaging to the body. B. Yes. This is the reason patients are given pure (100%) oxygen during medical procedures. C. Yes. Increased oxygenation of the bloodstream is good for you and can increase your life span. D. No. Large amounts of oxygen will absorb hydrogen from the body and increase the amount of water in the body causing an imbalance in electrolytes.

A. No. Breathing 100% oxygen for extended periods of time can be damaging to the body.

Which statement best describes a compound? A. a material that is made up of a combination of atoms bonded together B. a mixture of more than one element C. a mixture of atoms D. a material that is made up of a single type of atom E. none of the above

A. a material that is made up of a combination of atoms bonded together

Classify the following changes as physical or chemical. Wood burns to ashes; water begins to boil; grass grows; a rock is crushed to powder. A. chemical; physical; chemical; physical B. chemical; physical; chemical; chemical C. physical; physical; chemical; physical D. chemical; physical; physical; physical

A. chemical; physical; chemical; physical

Which of the following would be considered a physical property? A. density B. corrosion resistance C. reactivity towards acid D. oxygen sensitivity E. flammability

A. density

A sample of iron weighs more after it rusts because A. of the additional oxygen it contains. B. rust contains twice as many iron atoms. C. it has expanded into a greater volume. D. Wrong. Iron actually weighs less after it rusts.

A. of the additional oxygen it contains.

An example of basic research is A. the study of the composition of the atom. B. the study of the relationship between the amount of automobile emissions gases in the atmosphere and the decomposition of atmospheric ozone. C. the study of natural compounds in sea animals to look for new molecules that can be used for medicine. D. the design of new batteries for electric cars. E. the development of new plastics that can be recycled.

A. the study of the composition of the atom.

Oxygen, O2, has a boiling point of 90 K (-183°C), and nitrogen, N2, has a boiling point of 77 K (-196°C). Which is a liquid and which is a gas at 80 K (-193°C)? A. Oxygen is a gas, nitrogen is a liquid at 80 K. B. Nitrogen is a gas, oxygen is a liquid at 80 K.

B. Nitrogen is a gas, oxygen is a liquid at 80 K.

What do members of the Chemical Manufacturers Association pledge in the Responsible Care program? A. The members pledge to manufacture utilizing responsible chemical standards. B. The members pledge to manufacture without causing environmental damage. C. The members pledge responsible care by using only USP grade reagents. D. The members pledge responsible care for all laboratory test animals.

B. The members pledge to manufacture without causing environmental damage.

Which of the following is not a chemical change? A. grass growing B. a rock being crushed to powder C. wood burning to ash D. grape juice turning into wine E. a loaf of bread growing mold

B. a rock being crushed to powder

Of the three sciences, physics, chemistry, and biology, the most complex is A. physics because it involves many mathematical equations. B. biology because it is based upon both the laws of chemistry and physics. C. chemistry because there are so many possible combinations of atoms. D. All three of these sciences are equally complex.

B. biology because it is based upon both the laws of chemistry and physics.

Which of the following would be considered applied research? A. examining how susceptible a metal is to bending B. determining the lightest and strongest metal to be used for an airplane wing C. testing the strength of a piece of metal D. determining how readily a metal corrodes in a wet environment E. determining the melting temperature of a metal

B. determining the lightest and strongest metal to be used for an airplane wing

Each night you measure your height just before going to bed. When you arise each morning, you measure your height again and consistently find that you are 1 inch taller than you were the night before but only as tall as you were 24 hours ago! Is what happens to your body in this instance best described as a physical change or a chemical change? A. chemical change because it involves your body B. physical change because it readily reverses C. physical change because water expands as it freezes D. chemical change because it involves changes in your bone structure

B. physical change because it readily reverses

Which of the following is an example of a physical change? A. a candy bar being digested by a student B. water boiling and being converted into steam C. iron metal reacting with oxygen to form rust D. water being electrolyzed and being converted in hydrogen and oxygen E. charcoal being converted into ash

B. water boiling and being converted into steam

Rank the compounds in order of increasing numbers of atoms: (a) C12H22O12, (b) DNA, (c) Pb(C2H3O2)2.

C, A, B

Rank the following in order of increasing force of attraction between its submicroscopic particles: (a) sugar, (b) water, (c) air.

C, B, A

A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels. Upon heating the kernels all pop thereby escaping the skillet. Which of the following physical and/or chemical changes occurred? A. The water within each kernel is heated to the point that it would turn into water vapor as the kernels popped (physical change). B. The starches within the kernels are cooked by the high temperatures (chemical change). C. Both A and B occur. D. Physical and chemical changes cannot occur without a real chemical reaction taking place.

C. Both A and B occur.

What chemical change occurs when a wax candle burns? A. The molten wax is pulled upwards through the wick. B. The wax within the wick is heated to about 600°C. C. The heated wax molecules combine with oxygen molecules. D. The wax near the flame melts.

C. The heated wax molecules combine with oxygen molecules.

Water and ethanol can be separated by heating the ethanol until it boils away from the water. What type of change is this? A. a chemical change B. a molecular change C. a physical change D. a decomposition E. none of the above

C. a physical change

Which of the following would not be considered matter? A. clouds B. air C. light D. rain E. trees

C. light

How would you describe the volume of the following object? the amount of water in a swimming pool A. submicroscopic B. microscopic C. macroscopic D. all of the above E. none of the above

C. macroscopic

How would you describe the size of the following object? a blood cell A. macroscopic B. submicroscopic C. microscopic D. all of the above E. none of the above

C. microscopic

A TV screen looked at from a distance appears as a smooth continuous flow of images. Up close, however, we see this is an illusion. What really exists are a series of tiny dots (pixels). This is similar to a chemist's view of matter in that A. elements are made up of only three basic types of matter. B. anything that a chemist can see, touch, hear, smell, or taste is an illusion. C. on the submicroscopic level, chemist's find that matter is made of extremely small particles, such as atoms and molecules. D. the fundamental particles of matter can also be seen when looked at closely with a magnifying glass.

C. on the submicroscopic level, chemist's find that matter is made of extremely small particles, such as atoms and molecules.

A TV screen looked at from a distance appears as a smooth continuous flow of images. Up close, however, we see this is an illusion. What really exists are a series of tiny dots (pixels). This is similar to a chemist's view of matter in that A. the fundamental particles of matter can also be seen when looked at closely with a magnifying glass. B. anything that a chemist can see, touch, hear, smell, or taste is an illusion. C. on the submicroscopic level, chemist's find that matter is made of extremely small particles, such as atoms and molecules. D. elements are made up of only three basic types of matter.

C. on the submicroscopic level, chemist's find that matter is made of extremely small particles, such as atoms and molecules.

What is the name of the following compound? SF3 A. trifluorosulphide B. fluorine sulphide C. sulfur trifluoride D. sulfur fluoride E. none of the above

C. sulfur trifluoride

Which of the following would not be considered a physical property? A. hardness B. conductivity C. temperature at which a material catches on fire D. temperature at which a material melts E. color

C. temperature at which a material catches on fire

Which of the following would not be considered a chemical property? A. whether a material will dissolve in acid or not B. the tendency of a material to explode C. the temperature at which a liquid will boil D. whether a metal will rust or not E. light sensitivity

C. the temperature at which a liquid will boil

Is chemistry the study of the submicroscopic, the microscopic, or the macroscopic, or all three? A. Submicroscopic because it deals with atoms and molecules, which can't be seen with a microscope. B. Microscopic because it pertains to the formation of crystals. C. Macroscopic because it deals with powders, liquids, and gases that fill beakers and flasks. D. All of the above because most everything is made of atoms and molecules.

D. All of the above because most everything is made of atoms and molecules.

In the winter Vermonters make a tasty treat called "sugar on snow" in which they pour boiled-down maple syrup onto a scoop of clean fresh snow. As the syrup hits the snow it forms a delicious taffy. Which of the following changes are involved in the making of sugar on snow? A. Boiling down the maple syrup involves the evaporation of water. B. The syrup warms the snow causing it to melt while the syrup becomes more viscous. C. As the maple syrup is boiled the sugar within the syrup begins to caramelize, which is an example of a chemical change. D. All of the above changes are involved in the making of sugar on snow.

D. All of the above changes are involved in the making of sugar on snow.

The boiling point of methanol is 65°C and the boiling point of ethanol is 78°C. Which of the following statements is true? A. At 40°C the methanol reacts with the ethanol. B. At 90°C you would have methanol and ethanol as solids. C. At 50°C you would have methanol and ethanol as gases. D. At 70°C you would have methanol gas and liquid ethanol. E. none of the above

D. At 70°C you would have methanol gas and liquid ethanol.

The systematic names for water, ammonia, and methane are dihydrogen monoxide, H2O; trihydrogen nitride, NH3; and tetrahydrogen carbide, CH4. Why do most people, including chemists, prefer to use the common names for these compounds? A. The common names are shorter and easier to pronounce. B. The common names are more widely known. C. These compounds are encountered frequently. D. all of the above

D. all of the above

Which of the following is an example of a chemical change? A. a piece of metal expanding when heated, but returning to original size when cooled B. breaking a glass window C. aftershave or perfume on your skin generating a smell D. gasoline being used in the engine of a car producing exhaust E. water freezing into ice crystals

D. gasoline being used in the engine of a car producing exhaust

The element silicon has a melting point of 1,410°C and a boiling point of 2,355°C. It is a weak conductor of electricity, its density is 2.3 grams per cubic centimeter and it easily forms silicon dioxide when exposed to air. Which of the following is a chemical property of silicon? A. its melting point B. its ability to conduct electricity C. its density D. its ability to react with oxygen E. C and D

D. its ability to react with oxygen

How many atoms are in one molecule of Na2SO4? A. 2 B. 4 C. 24 D. 3 E. 7

E. 7

Which of the following can be classified as matter? A. ice cream B. water C. perfume D. sand E. all of the above

E. all of the above

Chemistry is the study of ________. A. matter B. transformations of matter C. only microscopic phenomena D. only macroscopic phenomena E. both A and B

E. both A and B

What is the name of the following compound? CaCl2 A. carbon chloride B. dicalcium chloride C. dichlorocalcium D. calc two E. calcium chloride

E. calcium chloride

What is the name of the following compound? CO2 A. dioxocarbon B. calcium dioxide C. calcium oxide D. dicobalt E. carbon dioxide

E. carbon dioxide

Which of the following would be considered basic research? A. studying ways of catching mice safely B. testing a safe, nontoxic mouse glue C. testing the strength of a mouse cage D. examining how quickly a trapdoor closes E. examining why a mouse likes cheddar cheese more than swiss cheese

E. examining why a mouse likes cheddar cheese more than swiss cheese

Which of the following would be considered a chemical property? A. melting temperature B. flexibility C. boiling temperature D. conductivity E. reactivity towards water

E. reactivity towards water

What is the name of the following compound? NaF A. sodium phosphide B. natural fosfate C. natrium fluoride D. nitrogen afleck E. sodium fluoride

E. sodium fluoride

What is the chemical formula for the compound dihydrogen sulfide?

H2S

What is the chemical name for a compound with the formula Ba3N2?

barium nitride