Chem Ch 1

Which of the following options correctly reflect the relationships between units of volume?

1 dm3 = 1000 mL 1 mL = 1 cm3 1 L = 1000 mL

0.05 km

1 significant figure

element

1 type

Mega

1 x 10^6

Which of the following are examples of exact numbers?

16 ounces in a pound 100 degrees Celsius between the freezing and boiling points of water 268 attendees at a conference

Which of the following expressions is not an exact number?

190.0 grams of water

0.0030

2

250 s

2 significant figures

0.0602 g

3 significant figures

0.00004715

4

0.1004

4

60.30 L

4 significant figures

53,069

5

Which of the following statements correctly defines a mixture?

A sample of matter that is a combination of two or more substances

Which of the following statements correctly define a substance?

A substance has distinct properties. A substance has a definite composition.

What are significant digits in a quantity?

All the reported digits, both certain and uncertain

Which of the following are non-SI units commonly used in chemical measurement?

Angstrom atomic mass unit degree Celsius

What is a quantitative property of a substance?

Any property that can be measured

K=

C+273.15

Which temperature scales have units of the same magnitude?

Celsius and kelvin

Which of the following properties of substances are physical properties?

Color Mass Melting point

How do exact numbers affect the significant figures of the answer to a calculation?

Exact numbers do not limit the number of significant figures in a calculation.

Which of the following terms describes a property of a substance that is dependent on the quantity of substance present?

Extensive property

A property of a substance that does not depend on the amount of matter present is known as a(n) ______ property.

Intensive

What is the unit abbreviation for the absolute temperature scale?

K

The most common scientific units used for volume

L and mL

Which of the following units are part of the SI system of measurement?

Meter Kilogram Kelvin

Which of the following statements correctly describe the separation of a mixture into its components?

Mixtures are separated by means of one or more physical processes. A mixture can be separated into its individual components without changing their identities.

Which of the following statements correctly describes a mixture?

Mixtures do not have a universal constant composition.

Which of the following are part of the macroscopic world?

Objects that we can see and touch Objects whose properties we can measure directly

opacity viscosity reaction to a magnetic field hardness density electrical conductivity melting point freezing point boiling point condensation point

Physical properties

Which of the following units are from the "English" system of measurement rather than the SI system?

Pounds Quart Mile

Which of the following properties of substances can be observed without making specific measurements?

Qualitative properties

A property of a substance that can be measured and expressed with a number is known as a(n) ______ property.

Quantitative

Which options correctly describe the procedures used to determine the number of significant digits in a reported quantity?

Start at the left and move right until you reach the first nonzero digit. All digits from the first nonzero digit onward (going to the right) are significant, if there is a decimal point. If the quantity has no decimal point, zeros to the right of the nonzero number may or may not be significant.

Which of the following statements correctly describe a chemical change?

The composition of a substance is altered during a chemical change. The physical properties of a substance are changed during a chemical change.

Which of the following statements correctly describe the SI base quantities and their units?

The correct abbreviation for kelvins is K. The SI unit for length is the meter.

Which of the following statements correctly describes a substance undergoing a physical process?

The identity of the substance does not change.

the study of chemistry

The study of matter The changes matter undergoes

The last digit in a measured value, whose exact value we cannot know for sure, is referred to as the ______.

Uncertain digit

Which of the following properties of water are physical properties?

Water exists as a liquid at 25oC. Water has a density of 1.00 g/mL. The boiling point of water is 373.15 K.

Which of the following statements correctly describe how to determine if a zero in a reported number is significant?

Zeros to the left of the first nonzero digit are not significant. "Trailing zeros" to the right of the last nonzero number may or may not be significant, if the quantity does not have a decimal point.

is rounded to have the same number of digits after the decimal as the quantity with the fewest digits after the decimal.

addition and subtraction

sig figs

all digits are significant except for 0 that position the decimal point.

mole

amount of substance

matter

anything that has mass & occupies volume

liquid Particles

are close together and have freedom of movement.

solid Particles

are close together in an orderly array.

gas Particles

are relatively far from each other.

chemical change

broken bonds, changed bonds

1 x 10^-2

centi

D

deci

extensive properties

depend on the amount/size present>heat>mass>volume

mixtrue

different types

When adding or subtracting quantities, the answer is rounded so that it has the same number of ______ in the quantity that has the fewest of these.

digits after the decimal

A substance has a _______chemical composition and its own ___________ physical and chemical properties.

distinct

physical change

does not result from a change in chemical composition.

A number that is part of a unit definition has no uncertainty associated with it and is called a(n) _________. Such numbers do not limit the number of significant figures in a calculation.

exact number

Every measurement includes some uncertainty, which is usually assumed to be reflected by one unit in the _____ digit of the number.

final

Chemical properties

flammability heat of combustion corrosiveness reactivity with acids or bases pH electromotive force

A conversion factor is a ______ derived from two terms that express the same quantity using different units.

fraction

expand to fill the container; no clear defined volume or shape

gases

intensive properties:

independent of the amount/size present > temperature> density> d=m/v Matter

In a measurement, a digit about whose exact value we cannot be sure is called a(n)

inexact digit

Precision

is the term used to refer to how close a series of measurements are to each other. The level of repeatability in a series of measurements

When a substance undergoes a physical process,

its composition does not change.

In chemical measurement and calculation, both the ______ and ______ temperature scales are regularly used.

kelvin Celsius

1 x 10^3

killo

angstrom

length

meter

length

take the shape of the container, clearly defined volume

liquids

Processes that are observable by the human eye occur at the

macroscopic level

amu

mass

kilogram

mass

Chemistry is the study of

matter and the reactions between substances

M

mega

μ

micro

1 x 10^-3

milli

m

milli

is rounded to have the same number of significant figures as the quantity with the fewest significant figures.

multiplication and division

Since a conversion factor expresses the same quantity in both the numerator and denominator, multiplying by such a ratio (e.g., 1mile/1.609km or 1.609km/1mile) is the same as

multiplying by 1

n

nano

What is the correct unit abbreviation for the scientific temperature scale derived from the freezing and boiling points of water?

oC

states of matter:

particulate explanation

Properties of a substance that require measurement in order to be observed are known as

quantitative properties.

All the digits recorded in a measurement are called the _____ figures of the measurement.

significant

When multiplying or dividing, the answer is rounded to contain the same number of ______ in the quantity that has the fewest of these.

significant figures

hold their shape

solids

compound

t types in one, all the same

degrees celcius

temperature

kelvin

temperature

A mixture can be separated into its component substances without changing their identities.

true

A sample of seawater from the Gulf of Mexico may have a different composition from that of a sample of seawater from the Pacific Ocean.

true

In order for a chemical property of a substance to be observed, the substance must undergo a chemical change/process

true

Accuracy

used to compare an experimental result to the "true" or accepted value. The relationship between a measurement/series of measurements and the true value