Chemistry Chapters 1,2,3 (Multiple Choice)
b
All known chemical elements are organized into groups based on similar chemical properties in the a. chemical chart b. periodic chart c. element table d. none of the above
a
An atom is a. the smallest unit of matter that maintains its chemical identity b. the smallest unit of a compound c. always made of carbon d. smaller than an electron
All of the following are examples of units except... a. mass b. kilometer c. gram d. ounce
a
d
a physical change occurs when a a. peach spoils b. silver bowls c. bracelet turns your wrist green d. glue gun melts a glue stick
A sample of gold has a mass of 96.5 g and a volume of 5.00 cm ^3. The density of gold is... a. 0.0518 g/cm^3 b. 19.3 g/cm^3 c. 101.5 g/cm^3 d. 483 g/cm^3
b
How many significant digits should be shown in the product of 1.6 cm and 2.4 cm? a. 1 b. 2 c. 3 d.4
b
How many significant figures would the answer to the following calculation have? 3.475*1.97+2.4712 is... a. 2 b. 3 c. 4 d. 5
b
The symbol mm represents... a. micrometer b. millimeter c. milliliter d. meter
b
The dimensions of a rectangular solid are measured to be 1.27 cm, 1.3 cm, and 2.5 cm. The volume should be recorded as... a. 4.128 cm ^3 b. 4.12 cm ^3 c. 4.13 cm ^3 d. 4.1 cm ^3
d
Three samples if 1.12 g, 1.8 g and 1.562 g are mixed together. The combined mass of the three samples expressed to the correct number of significant figures, would be recorded as... a. 4.4 g b. 4.48g c. 4.482 g d. 4.5 g
d
Using a metric ruler with 1 mm divisions, the sides of a rectangular piece of plywood were measured as 3.54 cm and 4.85 cm, which corresponds to an area of 17.1690 cm^2. Which of these shows the area expressed correctly? a. 17.1 cm ^2 b. 17. 169 cm ^2 c. 17.17 cm ^2 d. 17. 2 cm ^2
d
When 1.92 * 10^-6 kg is divided by 6.8 * 10^2 mL, the quotient equals a. 2.8 * 10^-4 kg/mL b. 2.8 * 10^-5 kg/mL c. 2.8 * 10^-8 kg/mL d. 2.8 * 10^-9 kg/mL
d
d
Nitrogen monoxide and oxygen, both colorless gases, form a red-brown gas when mixed. Nitrogen monoxide and oxygen are called the a. products b. equilibria c. synthetics d. reactants
a
Noble gases are in Group 18, and are best known because they are a. unreactive b. excellent conductors c. rare d. reactants
b
Plasma is the fourth state of matter. In the plasma state a. atoms gain electrons b. atoms lose electrons c. atoms for molecules d. atomic nuclei break down
b
Technological development often occurs a. by accident b. long after the basic research is complete c. in order to learn basic information d. only to make money
c
What happens to the energy in a substance when it changes state a. it is destroyed b. it is changes into mater c. it changes form, but is neither destroyed nor increased d. the energy remains unchanged
A numerical result is said to have good precision if... a. it agrees closely with an accepted value b. repeated measurements agree closely c. it has a small number of significant figures d. it is a large whole number
b
A theory is best described as a... a. series of experimental observations b. generalization that explains a body of known facts or phenomena c. scientifically proven fast d. testable statement
b
How is the measurement 0.000065 cm written in scientific notation? a. 65 * 10 ^-6 cm b. 6.5 * 10 ^-5 cm c. 6.5 * 10 ^-6 cm d. 6.5 * 10 ^-4 cm
b
The capacity of a Florence flask is 250 mL. Its capacity in liters expressed in scientific notation is... a. 2.5 * 10^-2 L b. 2.5 * 10^-1 L c. 2.5 * 10^1 L d. 2.5 * 10^2 L
b
The density of an object is calculated by... a. multiplying its mass times its volume b. dividing its mass by its volume c. dividing its volume by its mass d. adding its mass to its volume
b
The number of significant figures in the measured value 0.0320 g is... a. 2 b. 3 c. 4 d. 5
b
The number of significant figures in the measurement 0.000305 kg is... a. 2 b. 3 c. 6 d. 7
b
When 64.4 is divided by 2.00, the correct number of significant figures in the result is... a. 1 b. 3 c. 4 d. 6
b
Which of the following observations is quantitive? a. the liquid turns blue litmus paper red. b. the liquid boils at 100 C c. the liquid tastes better d. the liquid is cloudy
b
Which of these is a measure for Earth's gravitational pull on matter? a. density b. weight c. volume d. mass
b
Which of these measurements has been expressed to three significant figures? a. 0.052 g b. 0.202 g c. 3.065 g d. 500 g
b
All of the following are steps in the scientific method except... a. observing and recording data b. forming a hypothesis c. discarding data inconsistent with the hypothesis d. developing a model based on experimental result
c
How would 0.00930 m be expressed in scientific notation? a. 93 * 10 ^-4 m b. 9.3 * 10^-4 m c. 9.30 * 10^-3 m d. 9.30 * 10 ^-5 m
c
If values for x and y vary as an inverse proportion, a. their quotient is a constant b. their graph is a parabola c. their product is a constant d. their graph is a straight line
c
The density of aluminum is 2.70 g/cm^3. What is the mass of a solid piece of aluminum with a volume of 1.50 cm^3? a. 0.556g b. 1.80 g c. 4.05 g d. 4.20 g
c
The measurement 0.035550 g rounded off to two significant figures would be... a. 0.03 g b. 0.35 g c. 0.036 g d. 3.5 * 10^2 g
c
The number of grams equal to 0.5 kg is... a. 0.0005 b. 0.005 c. 500 d. 5000
c
The number of significant figures in the measurement 2010 cm is... a. 1 b. 2 c. 3 d. 4
c
The relationship between the mass m of a material, its volume V, and its density D is... a. D=mV b. D= V/m c. D= m/V d. D= m+v
c
The unit m ^3 measures... a. length b. area c. volume d. time
c
Two variable are directly proportional if their___ has a constant value... a. sum b. difference c. quotient d. product
c
What is 1.245633501*10^8 rounded to four significant figures? a. 1246 b. 1.2456 * 10^8 c. 1.246 * 10^8 d. 1.246 * 10^4
c
Which of these measurements has been expressed to four significant figures? a. 0.0020 mm b. 0.0402 c. 30.00 mm d. 402. 10 mm
c
Which of these metric units is used to measure mass? a. m b. mm c. g d. L
c
Which of these statements about units of measurement is not true? a. a unit compares what is being measured with a previously defined quantity b. a unit is usually preceded by a number c. measurements can be compared without knowing their units. d. the choice of unit depends on the quantity being measured
c
A measurement that closely agrees with an accepted value is best described as... a. precise b. reproductile c. significant d. accurate
d
A plausible explanation of a body of observed natural phenomena is a scientific... a. control b. experiment c. law d. theory
d
A statement that can be tested experimentally is a ... a. variable b. model c. generalization d. hypothesis
d
If 1 inch equals 2.54 cm, how many centimeters equal 1 yard? a. 0.0706 cm b. 14.2 cm c. 30.5 cm d. 91.4 cm
d
If repeated measurements agree closely but differ widely from the accepted value, these measurements are... a. neither precise nor accurate b. accurate, but not precise c. both precise and accurate d. precise, but not accurate
d
The SI base unit for time is the... a. day b. hour c. minute d. second
d
The SI base units for length and time are... a. centimeter and second b. meter and hour c. centimeter and hour d. meter and second
d
The average distance between the Earth and the moon is 386 000 km. Expressed in scientific notation, this distance is written as... a. 386 * 10^3 km b. 39 8 10^4 km c. 3.9 * 10^5 km d. 3.86 * 10^5 km
d
The graphs of two variables that are inversely proportional to one another is... a. a straight line b. an ellipse c. a parabola d. a hyperbola
d
The quantity of matter per unit volume is... a. mass b. weight c. inertia d. density
d
The result dividing 10^7 by 10^-3 is... a. 10^-4 b. 10^2.5 c. 10^4 d. 10^10
d
The symbols for units of length in order from largest to smallest are... a. m, cm, mm, km b. mm, m, cm, km c. km, mm, cm, m d. km, m, cm, mm
d
When 5.7 m is divided by 2 s the quotient is correctly reported as... a. 2.8 m/s b. 2.85 m/s c. 2.9 m/s d. 3 m/s
d
Which of the following observations is qualititative? a. a chemical reaction was complete in 2.3 seconds. b. the solid has a mass of 23.4 grams c. the pH of liquid was 5 d. salt crystals formed as the liquid evaporated
d
Which of these equations does not describe an inverse proportionality between x and y? a. xy=k b. x=k/y c. y=k/x d. k=x/y
d
Which of these is a measure of the amount of material? a. density b. weight c. volume d. mass
d
Which pair of quantities determines the density of a material? a. mass and weight b. volume and weight c. volume and concentration d. volume and mass
d
a
Applied research is carried out in order to a. solve a particular problem b. by accident c. to learn basic information d. in order to make money
c
Basic research is usually performed a. to develop new products b. to understand an environmental problem c. to gain knowledge d. to solve a particular problem
b
Biochemistry is the study of a. properties, changes, and relationships between energy and matter b. the chemistry of living things c. crystals and minerals d. carbon-containing compounds
d
Organic chemistry is the study of a. properties, changes, and relationships between energy and matter b. the chemistry of living things c. crystals and minerals d. carbon-containing compounds
c
A chemical can be defined as a. a toxic substance b. an unnatural additive c. any substance that has a definite composition d. any substance that is not alive
b
Metalloids are often a. unreactive b. semiconductors c. lanthanides d. from outer space
d
A chemical change occurs when a. dissolved minerals solidify to form a crystal b. ethanol is purified through distillation c. salt deposits form from evaporated seawater d. a leaf changes color in the fall
b
A compound is a. a pure substance that cannot be broken down into simpler, stable substances b. a substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances c. the smallest unit of matter that maintains its chemical identity d. any substance, whether it is chemically bonded or not
c
A homogenous mixture is also called a. chemically bonded b. a compound c. a solution d. a solute
d
A measure of the quantity of matter is a. density b. weight c. volume d. mass
c
A mixture is a. a combination of pure substances bonded chemically b. any substance with a uniform composition c. a blend of any two or more kinds of matter, as long as each maintains its own unique properties d. any group of elements that are chemically bonded to one another
a
A nonmetal is usually a. brittle b. malleable c. a good conductor d. used to make jewelry
c
A solid substance is a. always frozen regardless of its container b. always a crystal regardless of its container c. always the same shape regardless of its container d. always losing parties regardless of its container
b
A state of matter in which a material has no definite shape but has a definite volume is the ______ state a. gas b. liquid c. plasma d. solid
d
A true statement about mass is that a. mass is often measured with a spring sale b. mass is expressed in pounds c. as the force of Earth's gravity on an object increases, the object's mass increases d. mass is determined by comparing the mass of an object with a set of standard masses that are part of a balance
b
If a mixture is not uniform throughout, it is called a. homogenous b. heterogenous c. chemically bonded d. a solution
a
If a mixture is uniform in composition, it is said to be a. homogenous b. chemically bonded c. heterogenous d. a compound
a
Inorganic chemistry is the study of a. non-carbon related compounds b. the chemistry of living things c. mathematical modeling d. the identification of the composition of materials
d
It is easy to determine whether a substance is a metal if the substance is a. easy to break down into its components b. very hard c. very brittle d. a good electrical and heat conductor
b
Matter includes all of the following except a. air b. light c. smoke d. water vapor
d
The horizontal rows on the periodic table are called a. actinides b. families c. elements d. periods
d
The liquid state of matter can be described as a. having definite shape and definite volume b. having neither a definite shape and definite volume c. having lost electrons owing to energy content d. having a definite volume but not a definite shape
c
The only pure substance listed below is a. bread dough b. vinegar (5% acetic acid) c. vitamin c (ascorbic acid) d. seawater
b
The two most important properties of all matter are a. the ability to carry an electric current well and to hold electric charge b. taking up space and having mass c. being brittle and hard d. being malleable and ductile
c
The vertical columns on the periodic table are called a. periods b. rows c. groups d. elements
b
Under ordinary conditions of temperature and pressure, the particles in a gas are a. closely packed b. very far from one another c. held in fixed positions d. unevenly distributed
c
Which of the following is an example of a heterogeneous mixture a. a gold ring b. seawater c. granite d. sucrose
a
Which of the following is an example of a homogeneous mixture a. air b. orange juice c. raw milk d. marble
c
Which of the following is an extensive property of matter a. melting point b. boiling point c. volume d. density
b
Which of the following is an intensive property of matter a. amount of energy b. density c. volume d. mass
c
Which of the following is not a chemical change a. rusting b. igniting c. melting d. burning
d
Which of the following is not a physical change a. grinding b. cutting c. melting d. burning
A volume of 1 milliliter is equivalent to... a. 1 cubic centimeter b. 1 gram c. 1 liter d. 10^-1 cubic decimeters
a
In the equation density=mass/volume, mass divided by volume has a constant value. This means that the... a. equation graphs as a straight line b. variables mass and volume are inversely proportional c. equation graphs as a hyperbola d. product of mass and volume is a constant
a
The Si base unit for length is the... a. meter b. millimeter c. centimeter d. kilometer
a
The density of pure diamond is 3.5 g/cm^3. What is the volume of a diamond with a mass of 0.25 g? a. 0.071 cm ^3 b. 0.875 cm ^3 c. 3.75 cm ^3 d. 14 cm ^3
a
The graph of two variables that are directly proportional to one another is... a. a straight line b. an ellipse c. a parabola d. a hyperbola
a
The product of 13 cm and 5.7 cm is correctly reported as... a. 74 cm ^2 b. 74.0 cm ^2 c. 74.1 cm ^2 d. 75 cm ^2
a
The speed of light is 300000 km/s. In scientific notation, this speed is written to one significant figure as... a. 3*10^5 km/s b. 3.0 * 10 ^5 km/s c. 3. * 10 ^6 km/s d. 3.0 * 10 ^6 km/s
a
Which of these measurements has only nonsignificant zeros? a. 0.0037 mL b. 60.0 mL c. 400. mL d. 506 mL
a
Which of these symbols represents a unit of volume? a. mL b. mg c. mm d. cm
a
