Chem Final

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Which of the following could NOT be the temperature of a solid

-2K

How many meters are in 10.0 cm

0.100

A tablet contains 325.0 mg of the active ingredient. This mass may also be expressed as:

0.3250 g

How many kilometers are in 800 m

0.8

The results of an experiment are easiest to interpret when the experiment has________ variables

1

A solution with pH of 3 has a hydronium ion concentration of

10^-3 mol/L

When 32g of sulfur reacts with 48g of oxygen, 80g of sulfur trioxide is produced. If 16g of sulfur and 100g of oxygen are placed into a sealed container and are allowed to react, what is the mass of the material in the container after the reaction is completed

116g

Given: 2 g of sulfur will react with 3 g of oxygen to produce 5 g of sulfur trioxide. If 54 g of sulfur and 100g of oxygen are placed into a sealed container and are allowed to react, how much sulfur dioxide will be produced

135 g

A student working in the laboratory needs 200.0 g of a liquid chemical whose density is .690g/cm3. What volume of this liquid should she/he measure?

290 cm3

If the concentration of a dilute solution of nitric acid is .0001 M, what is the pH of that solution

4

The boiling point of a liquid is 178C. What us this temperature on the Kelvin scale?

451 K

When added to a sealed flask and heated , 6.0g of carbon and 16.0g of oxygen react to form 22.0g of carbon dioxide. How much carbon dioxide is formed when 24.0g of carbon is reacted with 100.0g of oxygen?

88.0 g

The species represented by CO is

A molecule made up of carbon and oxygen

Lemon Juice is...

Acidic

A scientific hypothesis is

All of the above Explanatory, predictive, testable

Joe conducts an experiment to test the effectiveness of a new drug for cancer. Which of the following variables would be easiest to control?

Amount of drug administered

What is the chemical symbol for gold

Au

Which of the following represents an compound

CO2

The Ancient Greek philosophers were probably the first to consider the behavior of matter in an organized way. What is the major distinction between "Greek philosophers" and the "modern scientist"

Experimentation

An oxidation reaction often occurs without a corresponding reduction reaction

F

A compound with polar bonds must be polar

False

A metal oxide will form an acid when when it is dissolved in water

False

Anions migrate toward the cathode.

False

Aristotle's idea that matter is continuous is still considered to be correct

False

Corrosion of batteries is caused by the reduction of metals

False

In an electrochemical cell, oxidation takes place at the cathode

False

Matter is a measure of the amount of mass in an object

False

Mendeleev was the first person to attempt to arrange the elements in a systematic order

False

Naturally occurring reactions of oxygen (O2) are always desirable.

False

Organic foods do not contain chemicals

False

Substance A contains 80% carbon and 20% hydrogen. Substance B contains 83% carbon and 17% hydrogen. A and B are the same substance

False

The substances in a heterogeneous mixture retain their chemical identity, but those in a homogenous mixture do not

False

There is no difference between the hazard posed by an element when it is in a compound or by itself

False

Water has a density of 1.00g/ml. If you put an object that has the same density of .79g/ml into water, it will sink to the bottom

False

What is the chemical symbol for iron

Fe

Which of the following CANNOT be the chemical symbol for an element

H2

Sulfuric Acid is the leading chemical produced and used industrially. What is the formula for sulfuric acid?

H2SO4

Which one of the following is NOT an example of Green Chemistry

Hydrocarbons containing only Carbon and H atoms are used as a fuel source.

A molecule

Is the smallest characteristic part of a compound

In the SI system of measurement the unit of mass is the

Kilogram

What is the name of the element with the symbol Hg

Mercury

Which of these does NOT involve a chemical change

Mercury is used in barometers because it has a high density

In the SI system of measure the, the unit of length is the

Meter

Tangible items of pictures used by scientists to represent invisible processes are called

Models

Which of the following statements about atoms is NOT true

No atoms have been synthesized by scientists.

A hydrogen ion, H+ is the same as

Proton

Which of the following represents an element

Se

What is the name of the element with the symbol Ag

Silver

The evaluation of societal risk includes all of the following components of individual risk plus

The number of people affected by the incident

Which of the following was not a result of alchemy

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

Which of the following is not an outcome for companies that use green chemistry

They no longer have to follow federal pollution guidelines

A molecule is a group of atoms that are chemically bonded together.

True

All clothing contains chemicals

True

An example of a chemical change is browning of meat

True

An example of a physical change is a gas becoming a liquid

True

An orbital is a region in space in which there is a high probability of finding an electro

True

Antacids are basic compounds

True

Chemistry affects every aspect of our daily lives

True

During a chemical reaction, matter can neither be created nor destroyed

True

Heat will always glow from a warmer object to a cooler object

True

If a compound is a base according to Arrhenius definition, it will also be a base according to the Bronsted Lowry definition.

True

In Food Chemistry, reducing agents are sometimes referred to as antioxidants.

True

Mass is a measure of the amount of matter in an ovject

True

NO is a free radical.

True

Rainwater has a pH below 7 because raindrops absorb CO2 which can react with with water to form Carbonic Acid

True

Science does not prove a theory of hypothesis to be true. It can only prove something false

True

The destructive power generated by an explosive mixture results from the rapid expansion of gaseous products

True

The technology of smelly metals into ores was preformed long before the science of metallurgy evolved

True

A nonmetal oxide is called a

acidic compound

Which of the following does NOT involve chemistry

all of the above Creating materials for computers Glycolysis Burning of a forest

A chemist employed by an airplane manufacturer investigates new adhesives for the purpose of building airplanes without rivets. She is engaged in

applied research

A chemical change always involves a change in the _________ of matter

composition

One of the hallmarks of science is the ability to think ________.

critically

A salt that can conduct electricity when it is dissolved in water is a(n)

electrolyte

All redox reactions occur with the transfer of

electrons

Scientific results must be verified by

further experiment

A solution is another name for

homogeneous mixture

H3O+ is the

hydronium ion

A gas is characterized by a(n)

indefinite shape and indefinite volume

When doing a risk-benefit analysis and determining DQ, which situation is often the most difficult to evaluate from both an individual and societal perspective?

large benefit and high risk

The ability to recycle aluminum (or glass, or plastic) is ultimately an illustration of

law of conservation of mass

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

low

Mass is a better measure of the amount of matter than weight is because

mass is independent of location

Vinegar is composed of approximately 5% acetic acid and 95% water. Which one of the following is the best classification of vinegar?

mixture

In a reactions, the substance undergoing reduction serves as the

oxidizing agent

A conjugate acid-base pair differ by one

proton

Which of the following is a definition of reduction

reduction is the gain of hydrogen

Green chemists reduce the risk associated with the manufacture of a product by doing all of the following EXCEPT

requiring workers to use protective equipment

A buffer

resists change in pH, is made up of a weak acid and conjugate base, weak base and conjugate acid. (All of The Above)

When an aqueous solution containing hydrochloric acid is just neutralized with an aqueous solution containing sodium hydroxide, the solution would taste

salty

Which of these is a chemical change

silkworms convert mulberry leaves into silk

The physical state that retains both shape and volume is

solid

______________ chemistry is designed to meet the needs of the present generation without compromising the needs of future generations

sustainable

Archaeological evidence indicates that ancient Egyptians were brewing beer and other fermented beverages over 4000 years ago. In the mid 19th century, french scientist Louis Pasteur discovered and explained the source of fermentation using yeast. This example illustrates that

technological knowledge may come before scientific knowledge

scientific hypothesis is

tentative

Chemist A claims that a new compound will inhibit the growth of a virulent strain of bacteria. When Chemist B from a different laboratory tests the compound against the same bacterial strain, the bacteria grow at their normal rate. Which of the following statements best describes what has happened?

the claim is incorrect, because the test has not been replicated

Bronsted-Lowry useful broad view of reactions between acids and bases involve the

transfer of protons

Saccharin is used in some artificial sweeteners. Saccharin has been shown to be a very weak carcinogen (a substance that causes cancer) in animal tests, but there is little evidence of carcinogenicity in humans. Studies have also shown that artificial sweeteners provide little benefit to those who want to lose weight. The DQ for saccharin is:

uncertain

Give an example of an amphiprotic compound

water

A solution of a toilet bowl cleaner has a pH of 9. The solution is

weakly basic


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