Matter, Measurements, and Calculations Flashcards
The mass of an object is
Select one:
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.
b. a measure of the amount of matter in the object.
Which of the following represents a physical change in matter?
Select one:
a. A substance melts when heated.
b. A substance gives off a gas when heated.
c. A substance burns when heated.
d. A substance remains unchanged as it is heated.
a. A substance melts when heated.
Which of the following is a physical property of matter?
Select one:
a. it does not burn
b. produces a gas when placed in an acid
c. freezes at -10F
d. the surface turns black in air
c. freezes at -10F
The limit of chemical subdivision of an element is the
Select one:
a. atom.
b. molecule.
c. proton.
d. compound.
a. atom.
Molecules that contain only one kind of atom Select one: a. heteroatomic moledcules b. homoatomic molecules c. compounds d. mixtures
b. homoatomic molecules
The basic unit of length in the metric system is the
Select one:
a. mil.
b. millimeter.
c. foot.
d. meter.
d. meter.
Which of the following is a derived unit of the S.I. system?
Select one:
a. kilogram
b. meter
c. liter
d. mole
c. liter
How many significant figures are justified in a measurement of a length that is between 10 and 11 cm, if the measuring device (ruler) has smallest divisions of 0.01 cm?
Select one:
a. one
b. two
c. three
d. four
d. four
How is the weight of an object influenced when the gravitational force on the object is increased?
Select one:
a. the weight decreases
b. the weight increases
c. the weight is unchanged
d. the weight equal to the mass
b. the weight increases
The fact that gold does not corrode is a
Select one:
a. physical property.
b. personal property.
c. real property.
d. chemical property.
d. chemical property.
Which of the folowing is a chemical property of matter?
Select one:
a. color
b. density
c. freezing point
d. flammability
d. flammability
Which of the following terms correctly applies to a molecule of CO2?
Select one:
a. triatomic, heteroatomic
b. polyatomic, diatomic
c. triatomic, homoatomic
d. diatomic, heteroatomic
a. triatomic, heteroatomic
The prefix centi-denotes what fraction of a basic unit?
Select one:
a. 1/10
b. 1/100
c. 1/1000
d. 1000
b. 1/100
The fact that iron (Fe) corrodes when exposed to water and air is a
Select one:
a. physical property.
b. metal property.
c. chemical property.
d. real property.
c. chemical property.
How can the volume of an irregular unknown object be measured?
Select one:
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=πr
b. measuring the volume of water displaced by the object
Convert a temperature of 76 degrees F to a Celsius value.
Select one:
a. 10.2
b. 24.4
c. 42.2
d. 44.2
b. 24.4
Do the following calculation and express the answer using the correct number of significant figures.
(342) x (0.0012) ÷100.0
Select one:
a. 0.00410
b. 0.0041
c. 4.10 x 10-3
d. 0.004104
b. 0.0041
Do the following calculation. How many significant figures are justified for the answer?
5.02 + 6.119 + 0.04117
Select one:
a. four
b. three
c. five
d. seven
a. four
If urine has a density of 1.08 g/mL, what would the mass of a 125 mL urine sample?
Select one:
a. 135 g
b. 0.00864 g
c. 116 g
d. 125 g
a. 135 g
Suppose the speedometer in your car reads 55.0 mph. What is your speed in km/hr? 1 km = 0.621 miles.
Select one:
a. 34.1
b. 0.029
c. 88.6
d. 0.011
c. 88.6
Which of the following numbers is correctly expressed using scientific notation?
Select one:
a. 3489
b. 5.248 x 104
c. 45.78 x 105
d. 0.0987 x 103
b. 5.248 x 104
If a student completes 5 lab experiments out of a total of 8 lab experiments, what percentage of experiments was completed?
Select one:
a. 16.0
b. 6.25
c. 0.625
d. 62.5
d. 62.5
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)?
Select one:
a. 9
b. 11
c. 12
d. 15
c. 12
A hiker began a hike with a full pint canteen of water. One pint equals 16 fluid ounces. At the end of the hike, 7.0 ounces of water remained. What percent of the water was used during the hike?
Select one:
a. 78
b. 44
c. 56
d. 13
c. 56
Eighteen students in a class will get this question correct. If that represents 45% of the class, how large is the class?
Select one:
a. 20
b. 40
c. 60
d. 100
b. 40
