chem 1010 ch 3

A chemical change involves a change in ________. -All of the answers are correct. -the number of atoms before and after the change - how atoms are bonded -phase

C

A combination of two or more substances in which they no longer retain their chemical properties and cannot be separated by chemical means is called a(n) ________. compound mixture periodic trend suspension heterogeneous mixture

A

A sample of water that is 99.9999 percent pure contains 0.0001 percent impurities. Consider from Chapter 1 that a glass of water contains on the order of a trillion trillion (1 × 1024) molecules. If 0.0001 percent of these molecules were the molecules of some impurity, about how many impurity molecules would this be? 1,000,000,000,000,000,000 (one million trillion: 1 × 1018) 1,000,000,000 (one billion: 1 × 109) 1000 (one thousand: 1 × 103) 1,000,000 (one million: 1 × 106)

A

How soon will nanotechnology give rise to commercial products? - There are already commercial products on the market that have been developed using nanotechnology. -It will depend on how much funding nanotechnology research receives from the government. - Within the next 50 years. -Within the next 10 years.

A

If you eat metallic sodium or inhale chlorine gas, you stand a strong chance of dying. Let these two elements react with each other, however, and you can safely sprinkle the compound on your popcorn for better taste. What is going on? - Sodium chloride has nothing in common with the properties of the elements sodium and chlorine. - Sodium and chlorine from the elemental form is more concentrated than the sodium and chlorine we get from sodium chloride. - After these two elements react they lose the potential energy to cause harm. All elements are inherently dangerous.

A

Is the following transformation representative of a physical change or a chemical change? ab ab >> aa bb - chemical change because the atoms are connected differently - physical change because of a change in phase - physical change because a new material has been formed - chemical change because of a change in phase

A

Nanotechnology looks at working with particles ________ - 1 to 100 nanometers, the realm of individual atoms and molecules - 100 microns or larger - 50 grams and smaller - infinitesimally small, the size of electrons

A

What is the difference between a compound and a mixture? - A mixture can be physically separated into its components; a compound cannot be physically separated into its components. - A compound is just a mixture of elements. -The components of a mixture do not have the same properties individually as they do when mixed. - A compound can be physically separated into its components; a mixture cannot be physically separated into its components. - The components of a compound have the same properties individually as they do when combined.

A

What is the name of the following compound: N2O4 dinitrogen tetroxide nitrogen oxide dinitrogen tetroxygen nitrogen oxygen

A

Which of the following would not be considered a physical property? temperature at which a material catches on fire hardness conductivity color temperature at which a material melts

A

Each circle represents an atom. Which of the following boxes contains an element? A compound? A mixture? (To clarify, when the question asks which box contains an element, choose all boxes that contain an element, even if they contain something else as well.) A - aa, ab, aa, ab B- ab, ab, ab,ab C - aa, aa, aa, aa element: A, C; compound: A, B; mixture: A, B element: A, C; compound: A, B; mixture: A element: A, C; compound: A, B, C; mixture: A, B element: C; compound: A, B; mixture: B

B

How soon will nanotechnology give rise to commercial products? -Within the next 10 years. -There are already commercial products on the market that have been developed using nanotechnology. - Within the next 50 years. - It will depend on how much funding nanotechnology research receives from the government.

B

The Colorado River water in Colorado has a salinity of about 50 ppm. By the time this water passes into Mexico its salinity has increased to about 1000 ppm. How many milligrams of salts have been added to each liter of water? 95 milligrams have been added to each liter of water. 950 milligrams have been added to each liter of water. 9.5 milligrams have been added to each liter of water. 9500 milligrams have been added to each liter of water.

B

Typical levels of fluoride found in fluoridated public drinking water are about 1.00 ppm. If you were to drink 2.0 L of this water, how many mg of fluoride would you ingest? 1 mg 2 mg 0.001 mg 1000 mg

B

What is the name of the following compound? CaCl2 - carbon chloride - calcium chloride - dichlorocalcium - dicalcium chloride - calcium dichloride

B

What is the name of the following compound? SF3 None of the answers are correct. sulfur trifluoride trifluorosulphide fluorine sulphide sulfur fluoride

B

Which of the following statements best describes an element? -a material that has consistent physical properties regardless of temperature or pressure -a material consisting of only one type of atom -a material that exists only as individual atoms -a material that is pure -a material with more than one type of atom

B

Dioxins are highly toxic compounds that form upon the burning of certain plastics, especially PVC. Dioxins bioaccumulate, which means that animals higher in the food chain tend to have greater concentrations. Most of our exposure to dioxins comes from the food we eat rather than the air we breathe. How many milligrams of dioxins are there in a liter of milk containing 0.16 ppt (parts per trillion)? 1.6 × 10-3 mg = 0.0016 mg 0.16 mg 1.6 × 10-7 mg = 0.00000016 mg 1.6 × 10-5 mg = 0.000016 mg

C

Dioxins are highly toxic compounds that form upon the burning of certain plastics, especially PVC. Dioxins bioaccumulate, which means that animals higher in the food chain tend to have greater concentrations. Most of our exposure to dioxins comes from the food we eat rather than the air we breathe. How many milligrams of dioxins are there in a liter of milk containing 0.16 ppt (parts per trillion)? 1.6 × 10-5 mg = 0.000016 mg 1.6 × 10-3 mg = 0.0016 mg 1.6 × 10-7 mg = 0.00000016 mg 0.16 mg

C

Helium, He, is a nonmetallic gas and the second element in the periodic table. Rather than being placed adjacent to hydrogen, H, however, helium is placed on the far right of the table because ________. -the sizes of their atoms are vastly different - hydrogen and helium repel one another - helium is most similar to other group 18 elements - they come from different sources

C

How would you classify the following material? milk a compound a solution a suspension a heterogeneous mixture

C

Iron reacts with oxygen to form rust, or iron oxide. A sample of iron weighs more after it rusts because ________. rust contains twice as many iron atoms it has expanded into a greater volume of the additional oxygen it contains Wrong. Iron actually weighs less after it rusts

C

What is the name of the following compound: Mg(NO3)2 magnesium dinitrate magnesium nitride magnesium nitrate magnesium nitrogen oxide

C

Which of the following describes a nonmetal? good conductor of heat shiny poor conductor of electricity ductile malleable

C

A chemical change involves a change in ________. All of the answers are correct. phase the number of atoms before and after the change how atoms are bonded

D

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

D

If you filter sea water to remove all of the particles you would be left with a clear ________. heterogeneous mixture called a suspension heterogeneous mixture called a solution homogeneous mixture called a suspension homogeneous mixture called a solution

D

The prefix "nano-" means _____. 10^-12 10^-3 10^-6 10^-9

D

What is the name of the following compound: CaCO3 calcium carbonide calcium carbon trioxide calcium tricarbonate calcium carbonate calcium carbon oxide

D

Water and ethanol can be separated by heating the ethanol until it boils away from the water. What type of change is this? None of the answers are correct. a chemical change a molecular change a decomposition a physical change

E

What is the name of the following compound: AgBr silver mono bromine silver monobromide monosilver monobromide silver bromine silver bromide

E

When blue food coloring is dissolved in water, the result is a ________. homogeneous mixture called a suspension heterogeneous mixture called a solution heterogeneous mixture called a suspension pure liquid homogeneous mixture called a solution

E

Which of the following elements is a transition metal? lead (Pb) xenon (Xe) chlorine (Cl) lithium (Li) silver (Ag)

E