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Chemistry > Test Three Exam > Flashcards

Test Three Exam Flashcards

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1
Q

What are the smallest particles into which an element may be broken down without changing the identity of the element?

A

Atoms

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2
Q

What does 1 millimeter of mercury (1 mmHg) equal?

A

1 torr

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3
Q

What is the number of protons in an atom?

A

Atomic number

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4
Q

What does the standard atmosphere (atm) equal?

A

760 torr

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5
Q

What isotope is the atomic mass unit defined relative to?

A

Carbon-12

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6
Q

Which step of the scientific method involves thinking about nature to develop an idea about how something works?

A

Hypothesizing

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7
Q

What is a microsecond?

A

10-6 s

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8
Q

What is the standard temperature and pressure (STP)?

A

273.15 K and 769 torr

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9
Q

How many atoms are in exactly one mole of arms?

A

6.022#10-23

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10
Q

What temperature equals 0K

A

-273.15C

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11
Q

What is the instrument used to measure atmospheric pressure?

A

Barometer

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12
Q

What is the amount of force exerted upon a surface per unit of area?

A

Pressure

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13
Q

In what state of matter do particles have enough energy to move freely but not enough energy to overcome their attraction for each Other?

A

Liquid

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14
Q

How closely a measured value matches the actual value is called what?

A

Accuracy

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15
Q

The dense central portion of an atom is called?

A

Nucleus

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16
Q

The link between the microscopic and macroscopic levels of chemistry is?

A

Avogadro’s number

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17
Q

Which law implies that, at constant temperature and pressure, the molar volume of an ideal gas is constant?

A

Avogadros law

18
Q

When food coloring dye is dropped into water, the dye spreads throughout the water until they are evenly mixed. Name the molecular process that causes the dye and water to mix.

A

Diffusion

19
Q

What quantity is the ratio of mass to volume?

A

Density

20
Q

The branch of science that deals with the study of the composition

A

Chemistry

21
Q

What are the three main steps to the scientific method?

A

Observing
Hypothesizing
Experimenting

22
Q

Once a hypothesis has been supported by many experiments and verified by other scientist it is considered what?

A

A theory

23
Q

What is a theory that has stood the test of time?

A

A scientific law

24
Q

Known as “the language of science”

A

Mathematics

25
Q

The consistency or reproducibility of a measurement is?

A

Precision

26
Q

How close a measurement is to the actual exact value

A

Accuracy

27
Q

Values obtained by counting or set by a definition

A

Exact numbers

28
Q

A collection of compatible, related units that can be used to measure various quantities

A

System of measurement

29
Q

Used world wide as the standard system of measurement

A

Metric system

30
Q

A modification of the metric system with meticulously defined standards for all units

A

SI

31
Q

The standard SI unit of length

A

Meter

32
Q

The quantity of matter in an object

A

Mass

33
Q

The force of gravity upon an object

A

Weight

34
Q

Characterized by a definite shape and volume

A

Solid

35
Q

Defined as anything that occupies space and has matter

A

Matter

36
Q

A substance that can be decomposed by chemical means into simpler substances

A

Compound

37
Q

A grouping of symbols that tells what types of atoms compose the compounds and the number of each type of atom in one molecule of the compound

A

Formula

38
Q

Both elements and compounds can be described as

A

Pure substances

39
Q

Pure substances composed of the same matter throughout a sample

A

Homogeneous

40
Q

A substance consisting of two or more pure substances that are physically mixed but not chemically combined

A

Mixture

41
Q

A mixture that consists of pure substance that are incompletely mixed

A

Heterogeneous

42
Q

A homogeneous part of a system that is in contact with but physically distinct from other parts of the system

A

Phase

Chemistry (12 decks)

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