CH 100

While driving in Australia, you fill your car with 55 L of gas costing $44.55 (Australian). What is the equivalent cost per gallon in U.S. dollars? (Note: 1 U.S. gal = 3.785 L and $1 Australian = $0.7597 U.S. at the time this problem was written.)

$2.33

Convert 233 K to °F

-40 °F

Which of the following temperatures is not possible? 1. 1001 K 2. 1001 °C 3. 1 K 4. -401 °C 5. -401 °F

-401 °C

What is the identity of an unknown object that has a mass of 1.08 kg and displaces 50.5 cm3 of water (see Table 2.4)? 1. Copper 2. Lead 3. Gold 4. Aluminum 5. Platinum

. Platinum

What is one important quality for being a successful chemist? 1. Curious 2. Courageous 3. Competent 4. Clueless 5. Careful

1. Curious

Which of the following is a scientific law? 1. Energy may be converted from one form to another, but the total quantity of energy remains constant. 2. Gases consist of molecules in constant random motion. 3. The burning of wood results in a flame, heat, smoke, and ash. 4. At absolute zero, the motion of all atoms stop. 5. None of the above

1. Energy may be converted from one form to another, but the total quantity of energy remains constant.

Which of the following is NOT a chemical property? 1. The density of a liquid 2. The ability of iron to rust 3. Flammability of gasoline 4. Reactivity of acids with metals 5. All of these are chemical properties.

1. The density of a liquid

Convert 155 ft2 to square centimeters?

1.44 x 105 cm2

What is the result of the following division expressed in scientific notation and with the correct number of significant figures: (6.05 x 10^6) ÷ (4.020 x 10^-9)? 1. 1.50 x 10^15 2. 1.51 x 10^15 3. 1.505 x 10^15 4. 2.43 x 10^-2 5. 1.51 x 10^3

1.50 x 10^15

Convert 1.500 km3 to liters.

1.500 x 1012 L

Convert 1.500 L to cm3

1.500 x 103 cm3

What is the result of the following application expressed in scientific notation and with the correct number of significant figures: (6.051 x 10^6) ÷ (4.020 x 10^-9) x (9.89 + 1.832) 1. 2.08 x 10^-3 2. 1.764 x 10^16 3. 1.76 x 10^16 4. 1.76 x 10^-16 5. 1.764 x 10^-16

1.764 x 10^16

Convert 42 °C to °F and express the answer to the correct number of significant figures.

108 oF

What is the result of the following subtraction expressed with the correct number of significant figures: 20.15 - 10.569? 1. 9.6 2. 9.58 3. 9.581 4. 30.72 5. 10.

2. 9.58

Which of the following is an example of a scientific theory? 1. The addition of battery acid to sugar results in the formation of a black substance and smoke. 2. Gases consist of molecules in constant random motion. 3. The burning of wood results in a flame, heat, smoke, and ash. 4. A pure compound always contains definite or constant proportions of elements by mass. 5. None of the above

2. Gases consist of molecules in constant random motion

How many kJ of energy are in a fast food hamburger containing 560 Calories? (Note: 1 Cal = 4.184 J.)

2.34 x 10^3 kJ

What is the mass of lead, which has a density of 11.4 g/mL and displaces 20.1 mL of water?

229 g

Which of the following type has the highest average kinetic energy? 1. Lead at 25 oC 2. Cold water at 21 oC 3. Hot water at 95 oC 4. A cool gas at 25 oC 5. A hot gas at 85 oC

3. Hot water at 95 oC

Which of the following would NOT be considered matter? 1. Water 2. Sugar 3. Light 4. Gasoline 5. Sand

3. Light

Convert 3.23 x 10^3 to decimal notation

3230

The gas mileage of a compact car in Europe is 15 km/L. How many miles per gallon would this vehicle obtain in the U.S.? (Note: 1 U.S. gal = 3.785 L and 1 km = 0.6214 mi.)

35 mi/gal

How many joules are required to raise the temperature of 1.074 g of iron from 25.1 C to 100.0 C? The specific heat of iron is 0.449 J/g • C.

36.1 J

When recording a volume measurement using a student type 25 mL buret, how should you read the volume? 1. Always with two decimal places 2. At the bottom of the meniscus 3. With all the digits from the glassware markings plus one estimated digit 4. All of the above 5. Two of the above

4. All of the above

Which of the following is a physical change? 1. Burning wood 2. Barbequing a steak 3. Splitting water into hydrogen and oxygen gases 4. Breaking a piece of glass 5. Baking a cake

4. Breaking a piece of glass

Which of the following statements best describes the Law of Conservation of Mass? 1. All matter contains the same mass. 2. Matter can be converted to less massive things. 3. Matter can be converted to more massive things. 4. Mass is neither created nor destroyed in a chemical reaction. 5. Mass can be either created or saved in a chemical reaction.

4. Mass is neither created nor destroyed in a chemical reaction.

What is the mass (in kg) of gold that experiences a temperature increase of 45.1°C when 6.034 Cal of heat are added? The specific heat of gold is 0.128 J/g • C and 1 Cal = 4.184 J.

4.37 kg

Convert 0.000459 to scientific notation?

4.59 x 10^-4

How many mL are 45.1 cm3?

45.1 mL

Which of the following can be classified as matter? 1. Lead 2. Salt 3. Car 4. Chair 5. All of the above

5. All of the above

Which of the following is a chemical? 1. Air 2. Shampoo 3. Water 4. Turpentine 5. All of the above

5. All of the above

Which of the following is an example of an amorphous solid? 1. Diamond 2. Salt 3. Gold 4. Water 5. Soot

5. Soot

Why do scientists use scientific notation? 1. To confuse students 2. To write very large numbers simply 3. To write very small numbers simply 4. All of the above 5. Two of the above

5. Two of the above

What are the fundamental SI units of length, mass, time, and temperature, respectively? 1. km, kg, s, K 2. m, g, s, °C 3. m, g, s, K 4. m, kg, s, °C 5. m, kg, s, K

5. m, kg, s, K

The number 5.43 x 10^-6 L can also be written as:

5.43 µL

How many significant figures are in 0.00500670?

6

In Australia, the highway speed limit is posted at 100 km/hr. What is this in mi/hr? (Note: 1 mi = 5280 ft and 0.6214 mi = 1 km.)

62.1 mi/hr

Convert 95.0 kWh to Calories. (Note: 1 Cal = 4.184 J and 1 kWh = 3.60 x 106 J.)

8.17 x 10^4 Cal

If you burn 100. g of wood and produce 15.0 g of ash, what is the mass of the other products produced?

85 g

A 0.250 kg bar of aluminum metal at 23.8 °C has 15.5 KJ of heat added. What is the final temperature of the aluminum bar? The specific heat of aluminum is 0.903 J/g • C.

92.5 C

Which digit(s) is/are certain in the measurement of 98.6 °F

98

What is the difference between a scientific hypothesis and a theory? 1. Only a scientific hypothesis can be scrutinized, while a theory is generally accepted and never changes. 2. A hypothesis is a summary of observed behavior, while a theory is an explanation of the behavior. 3. Once a hypothesis has been proven to be accurate, it becomes a theory. 4. A scientific hypothesis is a testable assumption, while a theory is an accepted model used to explain the way nature is and predict future behavior. 5. A hypothesis is a definite explanation for an observation, while a theory is just an educated guess.

A scientific hypothesis is a testable assumption, while a theory is an accepted model used to explain the way nature is and predict future behavior

Which of the following is a mixture? 1. Seawater 2. Iron ore 3. Air 4. Milk 5. All of the above

All of the above

Which of the following is an example of something with potential energy? 1. A ball falling through the air 2. A dart thrown at a dart board 3. A ball rolling down a slide 4. An arrow flying through the air 5. All of the above

All of the above

The connections that hold atoms to each other are called:

Chemical bonds

Which of the following is an element? 1. Sugar 2. Salt 3. Brass 4. Chlorine 5. Air

Chlorine

Which scientist proposed that all matter was composed of small, indestructible particles called atoms?

Dalton

What are the two parts of a number written in scientific notation?

Decimal and exponential

A solution is a(n):

Homogenous mixture

Which term best fits the following definition: A theory before it has become well established?

Hypothesis

What does the positive exponent tell you about the size of the number 6.022 X 10^23? 1. It is less than one. 2. It is less than 6.022. 3. It is equal to zero. 4. It is greater than 1. 5. There is not enough information given for an answer.

It is greater than 1

Which one of the following scientists stated and studied the Law of Conservation of Mass? 1. Dalton 2. Lavoisier 3. Proust 4. Rutherford 5. Aristotle

Lavoisier

How would you classify wine? 1. Pure substance—compound 2. Pure substance—element 3. Mixture—homogeneous 4. Mixture—heterogeneous 5. Pure substance—homogenous

Mixture—homogeneous

Convert 97 °C to K and express the answer to the correct number of significant figures. (Be careful now.) 1. 369 K 2. 370 K 3. 397 K 4. -176 K 5. No answer listed is correct.

No answer listed is correct.

The scientific method emphasizes:

Observations and experimentation

What is the first step in the scientific method?

Observe some aspect of nature

Boiling point is an example of a: 1. Physical change 2. Chemical change 3. Quantitative property 4. Physical property 5. Chemical property

Physical property

Which of the following is a pure substance? 1. Sodium 2. Milk 3. Blood 4. Saline solution 5. Stainless stee

Sodium

Which of the following is an example of an observation? 1. Energy may be converted from one form to another, but the total quantity of energy remains constant. 2. Gases consist of molecules in constant random motion. 3. The burning of wood results in a flame, heat, smoke, and ash. 4. A pure compound always contains definite or constant proportions of elements by mass. 5. None of the above

The burning of wood results in a flame, heat, smoke, and ash

Which of the following statements is FALSE? 1. The freezing of water is a physical change. 2. The conversion of compounds into elements is a physical change. 3. The combination of sodium metal and chlorine gas to form sodium chloride is a chemical change. 4. Photosynthesis is an example of a chemical change. 5. Distilling alcohol from water is a physical change.

The conversion of compounds into elements is a physical change.

What are the two important parts of a measurement?

The number and the unit

Chemistry is

The science of what matter does by studying atoms and molecules.

A state of matter that has a definite volume and is relatively incompressible is a: 1. Solid 2. Liquid 3. Gas 4. All of the above 5. Two of the above

Two of the above

Theories are validated by ________.

experiments

Which of the following is a frequently used unit for the density of liquids and solids? 1. g/L 2. kg/L 3. g/mL 4. cm3 /mL 5. g/m3

g/mL

The state of matter in which molecules are widely spaced is a:

gas

What is the metric system prefix for the factor 10-9?

n

3 A brief statement that summarizes past observations and predicts future ones is called a:

scientific law