Deck 1: Matter, measurements, and Calculations

Question 1

How is the weight of an object influenced when the gravitational force on the object is increased?

A) it decreases
B) it increases
C) it is unchanged
D) it equals the mass

Answer 1

it increases

Question 2

The mass of an object is

A) the force between the object and the earth.
B) a measure of the amount of matter in the object.
C) the amount of space the object occupies.
D) depends on the location of the object on the earth.

Answer 2

a measure of the amount of matter in the object.

Question 3

Any two objects are attracted to each other by _____ .

A) gravity
B) electrostatic forces
C) magnetism
D) all of them

Answer 3

gravity

Question 4

Table salt,NaCl is best classified as a(n)_____ .

A) compound
B) element
C) homogeneous mixture
D) heterogeneous mixture

Question 5

The weight of an object is

A) a measure of the gravitational force pulling the object toward the earth.
B) equal to the mass of the matter in the object.
C) a measure of the space occupied by the object.
D) the same at any location on the earth.

Question 6

After heating,a pure substance,A,is found to produce both B and C.What can be said about the substance A?

A) It is an element
B) It is a compound
C) It is either an element or compound
D) Impossible to predict

Question 7

The limit of chemical subdivision of an element is the _____ .

A) atom
B) molecule
C) proton
D) compound

Question 8

Which of the following terms correctly applies to a molecule of CO₂?

A) triatomic,heteroatomic
B) polyatomic,diatomic
C) triatomic,homoatomic
D) diatomic,heteroatomic

Question 9

Which of the following substances are composed of heteroatomic molecules?

A) an iron nail
B) oxygen
C) copper wire
D) water

Question 10

As two clear liquid solutions are thoroughly mixed,a red solid forms.This change is most likely _____ .

A) physical.
B) chemical.
C) neither chemical nor physical.
D) both chemical and physical.

Question 11

The fact that gold does not corrode is a ______ property

A) physical
B) personal
C) real
D) chemical

Question 12

The melting of ice to liquid water is correctly classified as

A) a chemical change.
B) a physical change.
C) both a chemical and a physical change.
D) neither a chemical nor physical change.

Question 13

The limit of physical subdivision of pure H₂O is _____ .

A) the atom
B) the molecule
C) the element
D) a proton

Question 14

Which of the following is a physical property of matter?

A) it does not burn
B) produces a gas when placed in an acid
C) freezes at -10 ^$\circ$ F
D) the surface turns black in air

Question 15

Which of the following is a chemical property of matter?

A) color
B) density
C) freezing point
D) flammability

Question 16

Which of the following is an example of a homogeneous mixture?

A) NaOH solution
B) mortar (mixture of water,sand and cement)
C) vinegar and oil salad dressing
D) more than one response is correct

Question 17

Two pure substances A and B react to form a new pure substance C.From this,we may conclude that

A) A and B are both elements
B) C is a compound,A and B may or may not be elements
C) C is an element,A and B are compounds
D) A,B,and C are all compounds

Question 18

Homoatomic pure substances are known as _____ .

A) protons
B) elements
C) compound
D) molecules

Question 19

A molecule represented by O-O-O must be classified as

A) homoatomic and polyatomic.
B) homoatomic and monoatomic.
C) heteroatomic and polyatomic.
D) heteroatomic and monoatomic.

Question 20

Which of the following represents a physical change in matter?

A) A substance solidifies at 443 K.
B) A substance produces a gas and a solid when heated.
C) A substance burns when heated.
D) A substance changes color when exposed to air.

Question 21

Early measurements of length were based on

A) dimensions of astronomical bodies.
B) dimensions of the human body.
C) dimensions of bodies of water.
D) distances between cities.

Question 22

The prefix centi- denotes what fraction of a basic unit?

A) 1/10
B) 1/100
C) 1/1000
D) 1000

Question 23

The number 0.00816 expressed correctly using scientific notation is _____ .

A) 8.16 * 10²
B) 8.16 * 10³
C) 8.16 * 10^-2
D) 8.16 * 10^-3

Question 24

How many significant figures are justified in a measurement of a length that is between 9 and 10 centimeters if the measuring device (ruler)has smallest divisions of 0.1 cm?

A) one
B) two
C) three
D) four

Question 25

Which number has the greatest number of significant digits?

A) 1.0035
B) 17.5000
C) 0.0000625
D) 6.022 * 10²³

Question 26

Do the following calculation,and express the answer using correct scientific notation.
______ = (6.00 *10²³)* (3.00)/ (284)

A) 6.34 * 10²¹
B) 1.58 * 10^-22
C) 6.34 *10^-2
D) 15.8

Question 27

Which of the following is an SI unit?

A) gram
B) liter
C) meter
D) calorie

Question 28

Convert a temperature of 76 ^$\circ$ F to a Celsius value.

A) 10
B) 24
C) 44
D) 169

Question 29

Do the following calculation and express the answer using the correct number of significant figures.______ = (342)* (0.0012)÷ 100.0

A) 0.00410
B) 0.0041
C) 4.10 *10^-3
D) 0.004*10⁴

Question 30

Which of the following consists of a single chemical species?

A) solution
B) homogeneous mixture
C) heterogeneous mixture
D) compound

Question 31

Which of the following set-ups will allow you to calculate the cost of fruit in dollars per gram,if the price is given as 0.79 dollars per pound?

A)

B)

C)

D)

Question 32

Which of the following numbers is correctly expressed using scientific notation?

A) 3489
B) 5.248 * 10⁴
C) 45.78 * 10⁶
D) .0987 * 10³

Question 33

Do the following calculation.How many significant figures are justified for the answer? ______= 6.02 + 5.119 + 0.04218

A) three
B) four
C) five
D) seven

Question 34

Which of the following is a derived unit of the S.I.system?

A) kilogram
B) meter
C) liter
D) mole

Question 35

The basic unit of length in the metric system is the _____ .

A) mil
B) millimeter
C) foot
D) meter

Question 36

The metric system is a measurement system that is

A) the official system for all nations of the world.
B) only used by a few of the nations of the world.
C) commonly used by U.S.physical scientists.
D) used exclusively in chemical calculations.

Question 37

A furnace delivers 8.0 *10⁴ BTU per hour.How many kilocalories per hour is this?
(hint: 1 cal = 0.00397 BTU)

A) 3.2 *10^-5 kcal
B) 3.2 *10² kcal
C) 2.0 * 10⁴ kcal
D) 2.5 * 10² kcal

Question 38

An entry wound is found to be 0.36 inch in diameter.Which of the following guns was likely to have been used?

A) 9 mm Beretta
B) 12 mm Uzi
C) 200 mm Howitzer
D) 0.5 cm pellet gun

Question 39

How many significant figures are used in expressing a measurement as 0.2503 L?

A) one
B) two
C) three
D) four

Question 40

Do the following calculation and express the answer using correct scientific notation.
______ = (2.97 *10²)* (6.09 *10^-7)

A) 5.53 * 10³
B) 1.81 * 10^-4
C) 4.88 * 10⁸
D) 2.05 * 10^-9

Question 41

If a student completes 5 problems out of a total of 8 on a pop quiz,what percentage of the quiz was completed?

A) 0.625
B) 6.25
C) 16.0
D) 62.5

Question 42

The density of zinc is 7.13 g/cm³.What is the mass in kilograms of a 125 cm³ cylinder of zinc?

A) 891 kg
B) 17.5 kg
C) 0.0175 kg
D) 0.891 kg

Question 43

The fact that iron (Fe)corrodes when exposed to water and air is a

A) physical property.
B) metal property.
C) chemical property.
D) real property.

Question 44

Suppose the speedometer in your car reads 55.0 mph.What is your speed in km/hr? (1 km = 0.621 mi. )

A) 34.1
B) 0.029
C) 88.6
D) 0.011

Question 45

If urine has a density of 1.08 g/mL,what would be the mass of a 125 mL urine sample?

A) 135 g
B) 0.00864 g
C) 116 g
D) 125 g

Question 46

If 13% of a class cheats on an exam and there are 93 students in the class,how many students should you recommend be expelled (to the nearest whole student)?

A) 9
B) 10
C) 12
D) 15

Question 47

Express the following "generic" number in standard notation.X.XX *10⁴

A) 0.000XXX
B) XX,X00
C) X,XX0
D) 0.00XXX

Question 48

A hiker began a hike with a pint canteen full of water.One pint equals 16 fluid ounces.At the end of the hike,7.0 fluid ounces of water remained.What percent of the water was used during the hike?

A) 78
B) 44
C) 56
D) 13

Question 49

How can the volume of an irregular unknown object be measured?

A) using a ruler to measure length,width,and depth
B) measuring the volume of water displaced by the object
C) obtaining the mass of the object
D) measure the radius and use V= $\pi$ r²

Question 50

On a cold winter day the weather report gives the temperature as -5.0° F.What would this temperature be if reported on the Kevin scale?

A) 252 K
B) 258 K
C) 268 K
D) -20.6 K

Question 51

Based on data obtained in an experiment,to determine the density of a metal,the following calculation is carried out.Express the answer to the correct number of significant figures.

A) 2.1 g/mL
B) 2.14 g/ml
C) 2.142 g/mL
D) 2.1423 g/mL

Question 52

Convert 30.0 ^$\circ$ C to Fahrenheit.

A) 112
B) 86.0
C) 48.7
D) 34.4

Question 53

Do the following calculation and express the answer using the correct number of significant figures.
______ = (1.21 *10^-3 + 1.3 *10^-3)* 6.453 *10²

A) 1.619
B) 2
C) 1.6
D) 1.62

Question 54

Eighteen students in a class will get this question correct.If that represents 45% of the class,how large is the class?

A) 20
B) 40
C) 60
D) 100

Question 55

Which of the following is not one of the five key body characteristics that provide a good assessment of a person's overall health?

A) blood pressure
B) blood cholesterol
C) body fat
D) age

Question 56

Express the following "generic number" in scientific notation.0.0000XXX

A) XXX * 10^-7
B) X.XX * 10⁵
C) X.XX * 10^-5
D) X.XX * 10^-4

Question 57

Knowing that 1 g = 0.035 oz and 16 ounces = 1 lb,calculate the number of grams in 10 pounds.

A) 35
B) 0.56
C) 1.8
D) 4.6 * 10³

Question 58

If a sample of blood was found to have a density of 1.05 g/mL,what would be the mass of 1.000 liters of this material? Express your answer with the proper number of significant figures.

A) 1.05 *10^-3 g
B) 1.05 * 10³ g
C) 1050 g
D) 1.050 kg

Question 59

Ethanol (ethyl alcohol)has a density of 0.789 g/mL at 25°C.If 75.5 g of ethanol is needed for a reaction,what volume in mL should be added to the reaction container?

A) 95.7 mL
B) 59.6 mL
C) 0.0105 mL
D) 78.9 mL

Question 60

You are able to carry a maximum of 20 kg.What is the maximum volume of gold that you can carry? (Au has a density of 19.6 g/cm³)

A) 392 cm³
B) 1.0 * 10³ cm³
C) 0.98 cm³
D) none of these

Question 61

If a 50 gram sample of iron alloy contains 40 grams if iron,it contains 80% iron by weight.

Question 62

If 3333 is divided by 5.0,the answer should have two significant figures.

Question 63

If 100 people in a town of 5,000 people own a certain color car,this represents 0.1% of the population.

Question 64

To convert microliters to liters,you should multiply by 1 liter/1,000,000 microliters.

Question 65

To convert micrograms to grams,you should multiply by 1,000,000 g/microgram.

Question 66

The number twelve,representing a dozen,has two significant figures.

Question 67

A patient weights 220 lbs.A medication for this patient is supposed to be taken 3 mg per kg per day.The correct dose for this patient is 3000 mg per day.

Question 68

If a 200 gram sample of water is partially frozen forming 40 g of ice,than 80% of the original sample is still a liquid.

Question 69

One system of rating food is to determine its energy density in kcal/g.If your 200 g snack contains 100 g fat (900 cal/g)and a total of 100 g of protein and carbohydrates (400 cal/gram).what is its energy density?

A) 1.3 kcal/g
B) 6.5 kcal/g
C) 9.0 kcal/g
D) 13 kcal/g

Question 70

A sample of urine is measured to have the density of 1.15 g/mL which is an indicator that there may be a medical problem.

Question 71

A Celsius degree is the same size as a Kelvin degree.

Question 72

The average gestation period (length of a pregnancy)for humans is 40 weeks.If a child if born after just 36 weeks,what was the percentage of this gestation period compared to the normal length?

A) 4.0 %
B) 10 %
C) 28 %
D) 90 %

Question 73

The figure shown below is an example of what type of molecule?

A) homoatomic,triatomic
B) heteroatomic,polyatomic
C) homoatomic,polyatomic
D) heteroatomic,triatomic

Question 74

It turns out that the dark side of the moon has as a mean temperature of -280 ^oF.What would that the temperature be on the Kelvin scale?

A) -553 K
B) -7 K
C) 100 K
D) 173 K

Question 75

The number 6730.0 contains five significant figures.

Question 76

Which of the following properties is characteristic of a mixture?

A) constant composition
B) variation of physical properties
C) fixed melting point.
D) cannot be physically separated into simpler materials

Question 77

If 6526 is added to 15.0,the answer should have two significant figures.

Question 78

A particular medication is a heterogeneous mixture.Since heterogeneous mixtures are consistent throughout,this medication does not need to be shaken.

Question 79

To convert feet to inches,you should multiply by the factor 12 in./ft.

Question 80

You are saving for a new $1226 (including taxes)laptop computer using earnings from your part-time job.At that job,you work 20 hours/week,earning $10.25/hour take home pay.If you can save 25% of all of your income,how many weeks will it take for you to save enough money?

A) 48 weeks
B) 24 weeks
C) 12 weeks
D) 6 weeks