Which of the following occurs in an ionic bond?

Oppositely charged ions attract.

What is one difference between a mixture and a compound?

A compound can only be separated by chemical means.

Which discovery did J. J. Thomson make that improved upon Dalton's atomic theory?

Atoms contain tiny, negatively charged electrons.

The quantum mechanical model of the atom

involves the probability of finding an electron in aposition

Which of the following is true about subatomic particles?

The mass of a neutron nearly equals the mass of a proton.

What is the definition of atomic mass unit?

one twelfth the mass of a carbon atom

The octet rule states that, in chemical compounds, atoms tend to have ____.

the electron configuration of a noble gas

When do ionic compounds conduct electricity?

when melted and dissolved in water

Atomic size generally

decreases as you move from left to right across a period.

What happens to matter during a chemical reaction?

Matter is neither destroyed or created.

Why do atoms share electrons in covalent bonds?

to attain a noble-gas electron configuration

What information does a molecular formula provide?

the number and kind of atoms present in a molecule

In Bohr's model of the atom, where are the electrons and protons located?

The electrons move around the protons, at the center

well tested explanation for a broad set of observations

Which of the following equals one atomic mass unit?

one-twelfth the mass of one carbon-12 atom

What is the definition of mass number?

the total number of protons and neutrons in the nucleus

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Chemistry Midterm (2017)

70 termsStudBud Administration51 plays

A #chemistry quiz to review first semester

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Questions 70

Answers

1
When paper turns yellow-brown upon exposure to sunlight, what type of change is taking place?
both a physical change and a chemical change
neither a physical change nor a chemical change
a chemical change
a physical change
2
What is another name for the transition metals?
Group A elements
Group B elements
Group C elements
noble gases
3
Which of the following elements is in the same period as beryllium?
magnesium
nitrogen
carbon
oxygen
4
Which subatomic particle plays the greatest part in determining the properties of an element?
neutron
electron
proton
nucleus
5
How many valence electrons are in an atom of neon?
4
8
3
2
6
Which of the following occurs in an ionic bond?
Two atoms share two electrons.
Two atoms share more than two electrons.
Oppositely charged ions attract.
Like-charged ions attract.
7
How does calcium obey the octet rule when reacting to form compounds?
It gives up electrons.
It gains electrons.
It does not change its number of electrons.
Calcium does not obey the octet rule.
8
What is one difference between a mixture and a compound?
A mixture can only be separated by chemical means.
A mixture must be uniform in composition.
A compound consists of more than one phase.
A compound can only be separated by chemical means.
9
What is the formula of the ion formed when potassium achieves 8 electrons in its outer shell?
K1-
K+
K2-
K2-
10
All atoms are
negatively charged
positively charged
neutral
11
Which discovery did J. J. Thomson make that improved upon Dalton's atomic theory?
Atoms contain a tiny, positively charged nucleus.
Atoms that combine do so in simple whole-number ratios.
Atoms contain tiny, negatively charged electrons.
Atoms are always in motion.
12
Who arranged the elements according to atomic mass predict the properties of missing elements?
Dmitri Mendeleev
Henry Moseley
antoine Lavoisier
John Dalton
13
The quantum mechanical model of the atom
defines the exact path of an electron around the nucleus.
involves the probability of finding an electron in aposition
was proposed by Niels Bohr.
no longer requires the concept of energy levels.
14
An element has an atomic number of 76. How many protons and electrons are there?
76 protons and 0 electrons
152 protons and 76 elements
38 protons and 38 electrons
76 protons and electrons
15
Which of the following is true about subatomic particles?
Electrons are the heaviest subatomic particle
The mass of a neutron nearly equals the mass of a proton.
Neutrons are the lightest subatomic particle.
Protons are the lightest subatomic particle.
16
Separating a solid from a liquid by evaporating the liquid is called
solution
filtration
condensation
distillation
17
Which of the following pairs of elements is most likely to form an ionic compound?
Sodium and magnesium
potassium and chlorine
nitrogen and oxygen
silicon and phosphourous
18
Which of the following groupings contains only representative elements?
Cu, Co, Cd
Al, Mg, Li
Ni, Fe, Zn
Hg, Cr, Ag
19
Which of the following is a chemical property?
color
hardness
ability to react with oxygen
freezing point
20
What is the definition of atomic mass unit?
one twelfth the mass of a carbon atom
the total number of protons and neutrons in the nucleus
the weighted average of the masses of the isotopes
the number of protons in the nucleus of an element.
21
The octet rule states that, in chemical compounds, atoms tend to have ____.
more protons than electrons
more electrons than protons
seven electrons in their principal energy level
the electron configuration of a noble gas
22
Which of the following is true about compounds?
Can be physically separated into their component elements.
They are substances.
have properties similar to those of their component elements
They have compositions that vary.
23
When do ionic compounds conduct electricity?
when dissolved in water
In solid form
when melted
when melted and dissolved in water
24
What is the charge on the oxygen ion?
2-
1-
1+
2+
25
Atomic size generally
decreases as you move from top to bottom within a group.
decreases as you move from left to right across a period.
remains constant within a period.
increases as you move from left to right across a period.
26
What happens to matter during a chemical reaction?
Matter is neither destroyed or created.
Some matter is destroyed and some is created.
Some matter is created.
Some matter is destroyed.
27
Which state of matter is characterized by having an indefinite shape, but a definite volume?
plasma
solid only
gas
liquid only
28
The study of all chemicals containing carbon.
biochemistry
inorganic chemistry
analytical chemistry
organic chemistry
29
Why do atoms share electrons in covalent bonds?
to increase their atomic numbers
to become more polar
to become ions and attract each other
to attain a noble-gas electron configuration
30
What information does a molecular formula provide?
the simplest whole-number ratio of atoms that are bonded
the number and kind of atoms bonded by transfer of electrons
the number and kind of atoms present in a molecule
information about a molecule’s structure
31
In Bohr's model of the atom, where are the electrons and protons located?
The electrons and protons are located throughout the atom
The electrons occupy fixed positions around the protons
The electrons move around the protons, at the center
The electrons and protons move throughout the atom.
32
How does calcium obey the octet rule when reacting to form compounds?
It gives up electrons.
It does not change its number of electrons.
It gains electrons.
Calcium does not obey the octet rule.
33
How many valence electrons are in an atom of magnesium (Mg)?
5
3
2
4
34
The atomic number of an element is the total number of which particles in the nucleus?
electrons
neutrons
protons
protons and electrons
35
Which of the following is a physical property?
combustible
ability to rust
explosive
melting point
36
Which of the following is a chemical change?
melting cheese
grating cheese
mixing two cheeses in a bowl
fermenting of cheese
37
What is the name given to the electrons in the highest occupied energy level of an atom?
cations
orbital electrons
anions
valence electrons
38
In carbon-13 what does the 13 represent?
mass number
atomic mass
atomic number
atomic mass unit
39
What is the net charge of the ionic compound calcium fluoride?
0
1+
2-
1-
40
Which of the following is a heterogeneous mixture?
air
soil
steel
salt water
41
Which of the following is true about homogeneous mixtures?
They are always liquids.
They are known as solutions.
They have compositions that never vary.
They consist of two or more phases.
42
Which of the following is a physical change?
evaporation
rotting of food
explosion
corrosion
43
What is the name given to the electrons in the highest occupied energy level of an atom?
anions
cations
valence electrons
orbital electrons
44
What is another name for the representative elements?
Group C elements
Group B elements
Group A elements
transition elements
45
A theory is a
summary of the results of many observations
proposed explanation for an observation
procedure used to test a proposed explanation
well tested explanation for a broad set of observations
46
Which of the following equals one atomic mass unit?
the mass of one helium-4 atom
the mass of one electron
the mass of one carbon-12 atom
one-twelfth the mass of one carbon-12 atom
47
The study of processes that take place in organisms.
organic chemistry
inorganic chemistry
biochemistry
physical chemistry
48
The modern periodic table is arranged in order of increasing atomic ____.
charge
radius
number
mass
49
What is the definition of mass number?
the number of protons in the nucleus of an element.
the total number of protons and neutrons in the nucleus
the weighted average of the masses of the isotopes
one twelfth the mass of a carbon atom
50
In an experiment testing the affects of music on plant growth, plant growth is the
manipulated variable
independent variable
responding variable
controlling variable
51
How does atomic radius change from left to right across a period in the periodic table?
It first decreases, then increases.
It first increases, then decreases.
It tends to increase.
It tends to decrease.
52
Which state of matter has a definite volume and takes the shape of its container?
solid
plasma
gas
liquid
53
What is the definition of atomic mass?
the total number of protons and neutrons in the nucleus
one twelfth the mass of a carbon atom
the number of protons in the nucleus of an element.
the weighted average of the masses of the isotopes
54
How is the number of neutrons in the nucleus of an atom calculated?
Add the mass number to the number of electrons.
Add the number of electrons and protons together.
Subtract the number of electrons from the number of protons.
Subtract the number of protons from the mass number.
55
The octet rule states that, in chemical compounds, atoms tend to have ____.
eight electrons in their outer energy level
more electrons than protons
more protons than electrons
10 valence electrons
56
What are the Group 1A and Group 7A elements examples of?
transition elements
representative elements
noble gases
nonmetallic elements
57
The nucleus of an atom is
positively charged and has more protons than neutrons.
the central core and is composed of protons and neutrons.
negatively charged and has a high density.
negatively charged and has a low density.
58
The equation H₃PO₄+3KOH -->K₃PO₄+3H₂O is an example of which type of reaction?
combustion
single replacement
combination
double replacement
59
Which of the following statements is true?
The nucleus of an atom never has a mass of 1 amu.
Protons are positively charged and have a mass of 1 amu.
Electrons are negatively charged and have a mass of 1 amu.
Neutrons are negatively charged and have a mass of 1 amu.
60
How many electrons does barium have to give up to achieve a noble-gas electron configuration?
2
4
1
3
61
Which state of matter takes both the shape and volume of its container?
gas
plasma
liquid
solid
62
The reaction 2Fe+3Cl-->2FeCl₃ is an example of which type of reaction?
single replacement reaction
combustion reaction
combination reaction
double replacement reaction
63
Which of the following correctly represents an ion pair and the ionic compound the ions form?
Pb4-, O2-; Pb2O4
Na-, Cl-; NaCl2
Ba+, O2-; Ba2O2
Ca2-, F-; CaF2
64
Which of the following elements forms an ion with a 1– charge?
hydrogen (H)
sodium (Na)
flourine (F)
potassium (K)
65
How do atoms achieve full valence shells in a single covalent bonds?
Two atoms share two electrons.
Two atoms share one electron.
Two atoms share two pairs of electrons.
One atom loses two electrons to the other atom in the bond.
66
Of the elements Pt, V, Li, and Kr, which is a nonmetal?
Pt
Kr
Li
V
67
Which of the following is a homogenous mixture?
muddy water
pasta in water
oil in vinegar
alcohol in water
68
The equation Mg(s)+ 2HCl(aq) -->MgCl₂(aq) +H₂(g) is an example of which type of reaction?
combination reaction
combustion
double replacement
single replacement
69
Evidence about Dalton’s atomic theory has shown that
atoms of an element can have different numbers of protons.
all of Dalton's hypotheses were correct.
atoms are divisible.
all atoms of an element are not identical
70
Which element has the largest electronegativity?
Potassium
Fluorine
Carbon
Rubidium

Chemistry Midterm (2017) Flashcards | StudBud