Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

3A1 > 450-500 > Flashcards

450-500 Flashcards

1
Q
  1. How much work is done on a 9kg mass of a perfect gas that is heated from 15°C to 175°C if the process follows the law PVn = 1.45. The characteristic constant for this gas is 0.325 kJ/kgK.

a. 322.76 J
b. 322.76 kJ
c. 1040 J
d. 1040 kJ

A

d. 1040 kJ

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q
  1. A perfect gas @ 415°C has its condition changed in the following two steps. In step #1 the volume remains constant at 20 m3 while the pressure changes from 750 kPa to 250 kPa. In step # 2 the gas is compressed isothermally to a final pressure of 1750 kPa. Calculate the final temperature of the gas.

a. T2 = 10.3°C,
b. T2 = -43.7°C,
c. T2 = 138.3°C,
d. T2 = 170.9°C,

A

b. T2 = -43.7°C,

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q
  1. How much work is required to compress a gas polytropically from 195 kPa to 1600 kPa while reducing the volume to 0.8 m3? Use the value of “n” for this gas as 1.35.

a. 399.26 kJ
b. 758.95 kJ
c. 1538 kJ
d. 1735 kJ

A

c. 1538 kJ

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q
  1. Any substance which cannot be broken down into other substances or ingredients by chemical means is a/an:

a. Mixture
b. Compound
c. Electron
d. Atom
e. Element

A

e. Element

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q
  1. Any substance composed of two or more elements which are combined chemically is a:

a. Chemical change
b. Physical change
c. Mixture
d. Compound
e. Mol

A

d. Compound

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q
  1. Any substance which consists of different elements or compounds or both is a/an:

a. Atom
b. Mixture
c. Solution
d. Element
e. Compound

A

b. Mixture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
  1. A substance is considered to be a ______________ if it consists of different elements or compounds or both, all of which retain their individual chemical properties.

a. compound
b. molecule
c. atom
d. element
e. mixture

A

e. mixture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q
  1. __________ are any substances, which cannot be broken down into other substances or ingredients by chemical means.

a. Compounds
b. Molecules
c. Atoms
d. Elements
e. Mixtures

A

c. Atoms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q
  1. If there is a material that cannot be separated into any other individual materials by any chemical means, then this material is called:

a. An atom
b. A compound
c. A mixture
d. A molecule
e. An element

A

e. An element

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q
  1. A material made up of two or more elements in chemical combination represents a/an________________.

a. chemical change
b. physical change
c. compound
d. mixture
e. kilogram-mol

A

c. compound

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q
  1. Any material made up of distinct elements, compounds or both, not chemically combined with each other represents a/an ___________________.

a. atomic structure
b. mixture
c. molecule
d. elemental compound
e. compound

A

b. mixture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q
  1. In the formula H2 there are _____________.

a. two molecules of hydrogen
b. two atoms of hydrogen
c. two elements of helium
d. two mixtures of hydrogen
e. two atoms of helium

A

b. two atoms of hydrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q
  1. The atomic number of an element refers to the number of ________________.

a. electrons
b. protons
c. neutrons
d. atoms
e. molecules

A

b. protons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q
  1. The formula mass of H2O is:

a. 12
b. 16
c. 18
d. 24
e. 36

A

c. 18

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q
  1. The formula mass for Mg(HCO3)2 is:

a. 142
b. 146
c. 164
d. 184
e. 192

A

b. 146

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q
  1. The formula mass for Na2 SO4 is:

a. 64
b. 96
c. 128
d. 142
e. 166

A

d. 142

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q
  1. The atomic number of an element is the number of _____________ that an atom of an element contains.

a. ions
b. neutrons
c. electrons
d. protons plus neutrons
e. protons

A

e. protons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q
  1. ________________ does not contain any neutrons in its nucleus.

a. Helium
b. Carbon
c. Oxygen
d. Hydrogen
e. Nitrogen

A

d. Hydrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q
  1. A neutron has a/an_____________________________.

a. negative electrical charge
b. positive electrical charge
c. no electrical charge
d. mass of zero
e. mass double that of the proton

A

c. no electrical charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q
  1. An electron has a/an_____________________________.

a. negative electrical charge
b. positive electrical charge
c. no electrical charge
d. mass of one
e. mass equal to the proton

A

a. negative electrical charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q
  1. Positive ions are called _________________.

a. isotopes
b. anions
c. acids
d. cations
e. bases

A

d. cations

22
Q
  1. A kilogram mol of a substance is an amount equal to its ________________________ in kilograms.

a. number of protons
b. molecular mass
c. number of neutrons
d. balanced mass
e. atomic number

A

b. molecular mass

23
Q
  1. In order to burn 60 kg of carbon the oxygen necessary will be:

a. 60
b. 100
c. 160
d. 180

A

c. 160

24
Q
  1. In order to burn 228 kg of sulphur the oxygen necessary will be:

a. 160
b. 200
c. 240
d. 228

A

d. 228

25
Q
  1. Frequently in a chemical equation the heat is represented by the symbol delta or by ______________.

a. the letter h for heat
b. the letter g for gas
c. omitting it (heat) altogether
d. an arrow pointing down
e. the letters Ht for heat

A

c. omitting it (heat) altogether

26
Q
  1. A proton has _______________________.

a. a negative electrical charge
b. a positive electrical charge
c. no electrical charge
d. a mass of zero
e. no attraction to the electron

A

b. a positive electrical charge

27
Q
  1. In order to burn 60 kg of carbon the oxygen necessary will be _____ kg:

a. 60
b. 80
c. 90
d. 100
e. 160

A

e. 160

28
Q
  1. Normally, the chemical formula of a substance represents an atom of that substance and therefore the formula mass is also the ___________________.

a. ionic mass
b. kilogram mol mass
c. molecular mass
d. chemical mass
e. None of the above

A

c. molecular mass

29
Q
  1. Compounds that are classified as acids obtain their acidity because of an ______________________.

a. excess of OH- ions
b. excess of H- ions
c. excess of H+ ions
d. excess of OH+ ions
e. excess of HOH+ ions

A

c. excess of H+ ions

30
Q
  1. Compounds that are classified as acids have the following characteristics:
1.     They have a soapy feeling
2.     They have a sour taste
3.     They change blue litmus paper red
4.     They will conduct electricity

a. 1, 2
b. 2, 4
c. 2, 3, 4
d. 1, 2, 3
e. 1, 3, 4

A

c. 2, 3, 4

31
Q
  1. Compounds that are classified as bases obtain their alkalinity because of ________________.

a. an excess of OH- ions
b. an excess of H- ions
c. an excess of H+ ions
d. an excess of OH+ ions
e. an excess of HOH+ ions

A

a. an excess of OH- ions

32
Q
  1. Compounds that are classified as bases have the following characteristics:
1.     They have a soapy feeling
2.     They have a sweet taste
3.     They have the ability to neutralize acids
4.     They will conduct electricity

a. 2, 3
b. 3, 4
c. 2, 3, 4
d. 1, 2, 3
e. 1, 3, 4

A

e. 1, 3, 4

33
Q
  1. Compounds that are classified as salts ________________________.

a. will disassociate into positively and negatively charged ions
b. will not disassociate into positively and negatively charged ions
c. will disassociate into positively charged ions only
d. will disassociate into negatively charged ions only
e. will remain neutral

A

a. will disassociate into positively and negatively charged ions

34
Q
  1. Compounds classified as salts have the following characteristics:
1.     They may taste sweet
2.     They may taste sour
3.     They may taste bitter
4.     They may taste salty

a. 1, 2, 3, 4
b. 2, 3, 4
c. 2, 3
d. 1, 4
e. 3, 4

A

a. 1, 2, 3, 4

35
Q
  1. Compounds classified as salts may have the following characteristics:
1.     Have a basic effect
2.     Have an acid effect
3.     Be neutral
4.     Change red litmus paper blue

a. 2, 3
b. 1, 2
c. 1, 3, 4
d. 2, 3, 4
e. 1, 2, 3, 4

A

e. 1, 2, 3, 4

36
Q
  1. Compounds that are classified as acids obtain their acidity because of an ________________.

a. excess of OH- ions
b. excess of H- ions
c. excess of H+ ions
d. excess of OH+ ions

A

c. excess of H+ ions

37
Q
  1. A(an) ______________ solution is an electrolyte.

a. basic
b. covalent
c. Ph
d. rubbing alcohol
e. organic

A

b. covalent

38
Q
  1. ___________ are compounds which, when in solution, will disassociate into positively and negatively charged ions.

a. Acids
b. Ions
c. Salts
d. Isotopes
e. Bases

A

c. Salts

39
Q
  1. Acids have a ___________ taste.

a. sweet
b. semi- sweet
c. sour
d. neutral
e. salty

A

c. sour

40
Q
  1. In chemistry, bases are also called ______________.

a. allotropes
b. buffers
c. acetic
d. catalysts
e. alkalies

A

e. alkalies

41
Q
  1. Elements are substances that _____________________.

a. are made up of only one atom
b. cannot be decomposed by chemical means into simpler forms of matter
c. exist only in certain chemical forms in the lab
d. are formed when two or more atoms chemically bond together

A

b. cannot be decomposed by chemical means into simpler forms of matter

42
Q
  1. Compounds are:

a. Pure substances formed when atoms of two or more different elements mix together.
b. Pure substances formed when atoms of only one element join together to form a different material than the original.
c. Pure substances formed when atoms of two or more different elements chemically bond together in fixed portions.
d. Pure substances formed when atoms of two or more elements are bonded together by nuclear reaction.

A

c. Pure substances formed when atoms of two or more different elements chemically bond together in fixed portions.

43
Q
  1. The physical and chemical properties of mixtures are distinctly different from those of the elements from which they are composed, while the properties of compounds are similar to the elements they are composed of.

a. True
b. False

A

a. True

44
Q
  1. The characteristics of an atom are determined by:

a. The temperature and pressure under which the atom is developed.
b. The number of photons in the nucleus of the atom.
c. The number of smaller particles within the atom and their interaction with each other.
d. The direction the electrons are traveling around the nucleus.

A

c. The number of smaller particles within the atom and their interaction with each other.

45
Q
  1. In a neutral atom, the number of protons equals the:

a. Number of electrons, therefore the electrical charge within the atom is balanced.
b. Number of neutrons, therefore the electrical charge within the atom is balanced.
c. Number of electrons, although the neutrons tend to cancel out the positive charge giving the atom an overall negative charge.
d. Number of neutrons and electrons within the atom in every case.

A

a. Number of electrons, therefore the electrical charge within the atom is balanced.

46
Q
  1. An atom is called a negative ion or anion if it has more electrons than it does protons.

a. True
b. False

A

a. True

47
Q
  1. The atomic number of Uranium is “92” which describes?

a. The atomic weight of an atom of Uranium.
b. The atomic mass of an atom of Uranium.
c. The number of electrons in an atom of Uranium.
d. The number of protons in an atom of Uranium.

A

d. The number of protons in an atom of Uranium.

48
Q
  1. The atomic mass of an element will be equal to?

a. The sum of the protons and neutrons that make up the element.
b. The sum of the protons, neutrons and electrons that make up the element.
c. The sum of the neutrons and electrons that make up the element.
d. The number of protons that are in the nucleus of and element.

A

a. The sum of the protons and neutrons that make up the element.

49
Q
  1. Substances can be either ionic or covalent in nature. These are terms used to describe?

a. The type of electrons that the element has.
b. The number of electrons the element has.
c. The type of bond that holds the elements together.
d. The type of bond that holds the atoms together.

A

d. The type of bond that holds the atoms together.

50
Q
  1. Ionic compounds are formed by?

a. The sharing of electrons between atoms.
b. The sharing of atoms between elements.
c. The transferring of protons between atoms.
d. The transferring of electrons between the atoms.

A

d. The transferring of electrons between the atoms.

51
Q
  1. Covalent bonding happens by?

a. The transferring of atoms between elements.
b. The sharing of electrons between atoms.
c. The transferring of electrons between atoms.
d. The sharing of covalent protons.

A

b. The sharing of electrons between atoms.

3A1 (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions