Solution A has a higher H3O+ concentration than Solution B

Which description of the atom resulted from this experiment?

a small, positive nucleus in mostly empty space

Which statement best describes the type of reaction that has occurred?

endothermic b/c energy was absorbed

Which statement describes how an increase in pressure will affect a gas?

It increases the temp of the gas by increasing the KE

Which conclusion is MOST correct?

black coffee and cow’s milk are acidic

Which statement describes the reaction?

the reaction is exothermic and gives off energy

the gas particles collide more frequently with the can

In nuclear reactions, which of the following occurs?

fission - the nucleus is unstable

If the piston moves down to decrease the vol, the pressure increases because particles

collide more frequently with the container walls

Which statement lists properties of the alkali metals?

They are extremely reactive and have one valence electron

Which statement best explains how a discovery becomes a scientific law?

Scientists were able to demonstrate the same relationship.

Which observation led to the revision of Thomson’s model

Electrons are found at certain distances from the nucleus.

If the temperature of the gas in a balloon were lowered, what would be the result and why?

It would shrink b/c KE of the molecules decreases

Which characteristic is common to both of these atomic models?

They both distinguish the nucleus from the rest of the atom

When results are compiled it builds validity to make theory

In an exothermic chemical or physical change, the temperature of the surroundings would

increase due to a gain of energy

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EOC questions for district made EOC 2018

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Questions 75

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1
Read the picture
820 mL
490 mL
500 mL
735 mL
2
Read the picture
Solution B has an equal OH- concentration to Solution A
Solution A has higher OH- ion concentration than Solution B
Solution A has a higher H3O+ concentration than Solution B
Solution B has a higher H3O+ concentration than Solution A
3
Compared to chemical reactions, nuclear reactions produce
far more energy
fewer changes in the nucleus
far less energy
more mass
4
How many grams of CO₂ are produced when reacting 6 moles of butane in excess oxygen?
2900 g
1060 g
66.0 g
1720 g
5
Which description of the atom resulted from this experiment?
consists of a hard, indivisible sphere
a small, positive nucleus in mostly empty space
consists of electrons in energy levels
a sea of positive charge containing electrons
6
What neutral atom has the electron configuration ls²2s²2p⁶3s²3p⁶4s¹ ?
K
Mg
Na
Ca
7
Which statement best describes the type of reaction that has occurred?
endothermic b/c energy was absorbed
exothermic b/c energy is released
exothermic b/c energy is absorbed
endothermic b/c energy was realeased
8
A gas element belongs to a group that is unreactive. How many valence e^- is does it have?
8
4
1
7
9
How many grams of CO₂ are produced when reacting 6 moles of C₄H₁₀ in excess oxygen?
66 g
1720 g
2900g
1060 g
10
Which property of water explains why glacial ice floats rather than sinks?
capillary action
heat capacity
density
adhesion
11
Read the picture
792.4 mmHg
721.6 mmHg
761.2 mmHg
750.2 mmHg
12
In relation to gas laws, standard temperature and pressure (STP) means
-273 K and 1 atm
0K and 760 mmHg
25oC and 760 mmHg
0oC and 1 atm
13
Which graph best shows the vol of a gas and its temp as pressure remains constant?
G
H
F
I
14
Which property of halogens determines the group’s placement in the periodic table?
atomic #
# of e-
reactivity
toxicity
15
Which statement describes how an increase in pressure will affect a gas?
It increases the temp of the gas by decreasing the vol
It causes a reaction by acting as a catalyst.
It increases the temp of the gas by increasing the KE
It causes a reaction by splitting large molecules.
16
Which conclusion is MOST correct?
sea water and distilled water are neutral
black coffee and cow’s milk are acidic
soapy water and saliva are basic
lemon juice and egg are acidic
17
Which two properties in the table describe water when it is a base?
1,2
2,3
1,4
3,4
18
Which of the following are diatomic molecules?
sulfate, oxygen, and methane
water, iron, and sodium
iodine, bromine, and nitrogen
carbon monoxide, nickel, and brass
19
Which statement describes the reaction?
the reaction is exothermic and gives off energy
the reaction is isothermic and energy doesn't change
the reaction represents a physical change
the reaction is endothermic and absorbs energy
20
Read the picture
1,4,6,7
1,3,6,7
1,2,5,7
1,2,6,7
21
Read the picture
76.1 g
62.0 g
408 g
204 g
22
Which statement best explains what occurred between time = 0.0s and time = 2.0s?
fewer collisions
temp increased b/c pot. energy increased
greater speed from decrease in pressure
increase in avg. kin. energy
23
Which properties describe Particle X?
small mass and negative charge
large mass and negative charge
large mass and positive charge
small mass and positive charge
24
Read the picture
the volume of the can decreases
the gas particles collide more frequently with the can
the avg. KE of the gas particles decreases
the # of gas particles increases
25
As you go down the periodic table in a group or family, the number of valence electrons
stays the same
decreases
increases
doubles
26
In nuclear reactions, which of the following occurs?
fission - the electrons are unstable
fusion - the nucleus is unstable
fusion - the protons are unstable
fission - the nucleus is unstable
27
If the piston moves down to decrease the vol, the pressure increases because particles
become smaller
lose velocity in the container
collide more frequently with the container walls
expand
28
In the formula for chromium (III) sulfate, what is the total number of atoms represented?
2
17
5
10
29
Read the picture
use of igneous rock
choice of instrument
the geologist's conclusions
the chemical composition of the rocks
30
Which statement lists properties of the alkali metals?
They are extremely unreactive and have one valence electron
They are extremely reactive and have one valence electron
They are extremely reactive and have eight valence electrons
They are extremely unreactive and have 8 valence electron
31
Based on the data chart, which liquid caused the most bone loss?
Lemon Juice
Coffee
Diet Soda
Liquid
32
Which of these correctly identifies each of the nuclear reactions?
1 decay, 2 fusion, 3 fission
1 fission, 2 decay, 3 fusion
1 decay, 2 fission, 3 fusion
1 fusion, 2 fission, 3 decay
33
Read the picture
pie chart
bar graph
scatter plot
line graph
34
What is the name for this type of molecule?
reactive
polar
diatomic
ionic
35
Which particle in an atom did this experiment help discover?
electron
nucleus
neutron
proton
36
Which statement best explains how a discovery becomes a scientific law?
Scientists proposed explanations for the relationship.
Lavoisier found evidence that showed why it occurred
Scientists were able to demonstrate the same relationship.
Lavoisier wrote a hypothesis that explained the relationship
37
Which is the correct Lewis dot diagram for hydrogen chloride?
A
D
C
B
38
Which of the following is the formula for diphosphorus pentoxide?
P2O5
P4O10
P5O2
K2O5
39
What are the coefficients of the balanced eqauation
2,1,2,1
1,2,2,1
2,1,1,2
1,2,1,2
40
Which observation led to the revision of Thomson’s model
Electrons are attracted to positive charges.
Electrons have a negative charge
Electrons are found at certain distances from the nucleus.
Electrons repel each other
41
If the temperature of the gas in a balloon were lowered, what would be the result and why?
it would expand b/c KE of the molecules increases
it would expand b/c KE of the molecules decreases
It would shrink b/c KE of the molecules increases
It would shrink b/c KE of the molecules decreases
42
Fluorine has an AN of 9 and a MN of 19. The number of e^- in the 2^nd energy level is
2
10
7
9
43
How many moles are in 2.04 x 10²⁴ molecules of water?
3.39 mol
1.13*1024 mol
1.44*1048 mol
0.295 mol
44
Which structure represents a nonpolar molecule?
C
D
A
B
45
Which characteristic is common to both of these atomic models?
They both show the exact size of the subatomic particles.
They both distinguish the different energy levels in an atom
They both show different masses of the subatomic particles.
They both distinguish the nucleus from the rest of the atom
46
What is the mass of a sample of 1.2 x 10²⁴ molecules of chlorine gas (Cl₂)?
18 g
141 g
71 g
36 g
47
Read the picture
An initial observation led to experiments to make hypothesis
When results are compiled it builds validity to make theory
It takes 7 scientists 100 years to make a hypothesis
Knowledge about the atom builds validity and establishes law
48
Read the picture
change in mass
change in temperature
change in weight
change in volume
49
In an exothermic chemical or physical change, the temperature of the surroundings would
decrease due to a loss of energy
increase due to a gain of energy
stay the same, no energy is transferred
exactly double
50
Which of these is a measure of the kinetic energy of the gas particles in a sample?
pressure
volume
concentration
temperature
51
How many moles of H₂O will be produced from 23.5 grams of phosphorous acid?
0.24 mol
0.48 mol
0.72 mol
1.72 mol
52
As you go across the periodic table, the number of valence electrons
increases by two
stays the same
decreases by one
increases by one
53
Use the graph to determine the half-life of Americium-242.
32 hrs
64 hrs
11 hrs
16 hrs
54
Which of the following has [H₃O⁺] and [OH^-] in solution that are close to equal?
Milk of magnesia
Milk
Cabbage
Baking soda
55
How many moles are present in 30.0 grams of zinc?
0.56 mol
2.18 mol
2.2 mol
0.459 mol
56
Which sample is behaving like a gas?
sample 1
sample 2
sample 4
sample 3
57
Why does there continue to be public concern regarding nuclear power plants?
Nuclear plants produce toxins which destroy the ozone layer
Using nuclear fission would break dependence on fossil fuels
The waste from the fission reaction is radioactive.
Nuclear plants produce toxins which destroy the ozone layer.
58
Which list identifies the states of matter shown in this diagram?
X: liquid; Y: gas; Z: solid
X: solid; Y: liquid; Z: gas
X: gas; Y: solid; Z: liquid
X: gas; Y: liquid; Z: solid
59
Read the picture
One reaction is exothermic and one reaction is endothermic
They are both combustion reactions.
They are both exothermic reactions.
They are both endothermic reactions
60
What is the function of these models in chemistry?
to show how macroscopic structures found in organisms work
to construct color-coded structures of atoms
to provide concrete ideas of microscopic structures
to explain the structure of chemical elements
61
Read the picture
low accuracy, low precision
low accuracy, high precision
high accuracy, low precision
high accuracy, high precision
62
An atom contains 3 protons, 3 electrons, and 4 neutrons. Which statement describes this atom?
the nucleus contains 3 positive and 4 neutral particles
the nucleus contains 3 negatively charged particles
the nucleus contains 3 positively charged particles
the nucleus contains 3 negative and 4 neutral particles
63
Which of the samples below would have a higher temperature?
B
both samples would have the same temperature
A
it is impossible to tell from the images
64
Which of these elements has the greatest atomic radius?
Cs
H
Cl
N
65
Which property do atoms in the shaded part of the table share?
they have two electron shells
they have 2 neutrons
they have 2 valence e-
they have two negative charges
66
How many mol of H₂ are produced when 0.066 mol of Na is reacted with H₂O?
0.066 mol
0.099 mol
0.022 mol
0.033 mol
67
Which property of H₂O is responsible for the fact that CO₂, O₂, and NaCl are soluble in water?
surface tension
high heat capacity
universal solvent
capillary action
68
which difference between the molecules could explain the distribution of their kinetic energies
varying masses
varying pressure
varying temperatures
varying bond lengths
69
Which statement describes a nuclear reaction?
Hydrogen gas and oxygen gas react to form water.
Hydrogen peroxide and acetic acid react to form H2O and O2
Atoms of hydrogen combine to form an atom of helium
Molecules of hydrogen peroxide separate into H2O and oxygen
70
Using the data in the table, what is the effect of sugar on the boiling time of water?
Adding sugar decreases the time for the water to boil.
Adding sugar increases the temperature of the water.
Adding sugar increases the time for the water to boil.
Adding sugar has no effect on the time for the water to boil
71
Read the picture
5
6
8
7
72
Which change would cause the peak of this curve to shift to the right?
increase in volume
increase in temperature
increase in molecular polarity
increase in molecular mass
73
Which chemical formula represents the molecule shown in the diagram?
2CH3
6CH
CH4
C2H6
74
The modern atomic theory is called the cloud model. What does the cloud consist of?
electrons and protons spinning rapidly around each other
electrons moving in random directions in an energy level
electrons moving in one direction within an energy level
neutrons and protons spinning rapidly around each other
75
What is the correct order of nuclear reactions from least to most energy released?
radioactive decay, fusion, fission
fusion, fission, radioactive decay
radioactive decay, fission, fusion
fission, radioactive decay, fusion

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