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WorksheetsChemistry Midterm 2018-2019
Total questions: 49
Worksheet time: 25mins
Name
Class
Date
1.
Randy planted a poinsettia in a pot without drainage holes. He observed that over the course of a month, many of the plant's leaves turned yellow.
What question can he ask about this observation that will lead to a testable hypothesis?
a)
What material was the pot made from?
b)
How does the amount of sunlight a plant receives affect the color of its leaves?
c)
How often do poinsettias need water?
d)
Does excess water around a plant's roots prevent it from taking in adequate nutrients?
2.
Alfonso observed that cleaning a shower with bleach gets rid of mold that grows along the sealant around the shower door.
What question can he ask about this observation that will lead to a testable hypothesis?
a)
Is bleach toxic to other organisms?
b)
What household cleaning products contain bleach?
c)
How often do showers need to be cleaned with bleach?
d)
What kind of mold typically grows in showers?
3.
A student placed three different types of soil into separate funnels. She poured 1 liter of water through each funnel and collected the water that flowed out of the funnel into a graduated cylinder.
Which question could best be answered by this investigation?
a)
Which soil will best resist compaction?
b)
Which soil is best for plants that require good drainage?
c)
How much water do vegetable plants require for optimum growth?
d)
How much water is lost to evaporation during warm temperatures?
4.
A student is conducting an experiment in which he must measure different volumes of liquids.
Which resource is required to proceed with this investigation?
a)
test tube/ petri dish
b)
Ruler/ meter stick
c)
Beaker/ graduated cylinder
d)
Eyedropper/ squeeze bottle
5.
A student is conducting an investigation in which he must observe cheek cells.
Which resource is required to proceed with this investigation?
a)
Balance
b)
Funnel
c)
Microscope
d)
calorimeter
6.
A researcher desires to test a hypothesis that using a larger piece of paper for his paper airplane will increase the flight time of his paper airplane. In this design, what would the flight time be considered?
a)
Independent variable
b)
Dependent variable
c)
Control group
d)
Experimental group
7.
Which variable is graphed on the Y-axis?
a)
Independent variable
b)
Dependent variable
c)
Control Group
d)
Controlled Variable
8.
A student is making a graph to show how the width of a river affects the speed of water.
Which is the best label for the y-axis?
a)
Width (m)
b)
Speed (m/s)
c)
Volume (L)
d)
Erosion rate (kg/m2)
9.
A student investigated to find out how temperature affects the amount of salt that will dissolve in water. He conducted three trials.
Which is the best label for the x-axis?
a)
Trial
b)
Amount of Water (milliliters)
c)
Water Temperature (Celsius)
d)
Amount of Salt (milligrams)
10.
What best explains why peer review is important?
a)
It eliminates bias
b)
It helps ensure accuracy.
c)
It promotes collaboration between scientists
d)
It increases funding of scientific research.
11.
Which characteristic is most important for scientists to demonstrate?
a)
secrecy
b)
arrogance
c)
skepticism
d)
aggressiveness
12.
A scientist published the results of a study suggesting that soy can help prevent influenza.
Which information would best help determine whether the study is free of bias?
a)
whether the scientist tested a variety of strains of influenza
b)
whether the scientist collaborated with any other scientists
c)
whether the scientist received funding from the soy industry
d)
whether the scientist's results confirmed his original hypothesis
13.
Part 1
Which is an example of pure science?
a)
applying knowledge of genes to develop gene therapy to prevent disease
b)
dissecting a deceased organism to learn about its anatomy and physiology
c)
conducting a blind pharmaceutical trial to determine how effective a new medication is
d)
experimenting with grafting different kinds of apple trees onto each other to grow tastier apples
14.
Part 1
Which is an example of pure science?
A. applying knowledge of genes to develop gene therapy to prevent disease
B. dissecting a deceased organism to learn about its anatomy and physiology
C. conducting a blind pharmaceutical trial to determine how effective a new medication is
D. experimenting with grafting different kinds of apple trees onto each other to grow tastier apples
Part 2
Which best explains the correct answer to Part 1?
a)
It involves experimenting with human subjects
b)
It involves using scientific knowledge to solve problems
c)
It involves expanding the knowledge of a field of science
d)
It involves observing without interfering with the natural world.
15.
Which of the following is an example of pure science?
a)
using a chemical from a mollusk to help design a new adhesive
b)
investigating to find out whether a citrus scent discourages cats from clawing furniture
c)
studying the effects of a vitamin supplement on athletes' performances
d)
comparing the genetic structure of an apple to the genetic structure of an orange
16.
Which of the following is a physical property of copper?
a)
Reacts with ammonia to form a deep blue solution
b)
Reacts with moist air to form copper carbonate
c)
Forms new substances when combined with nitric acid
d)
Conducts electricity
17.
Which of these metric units is matched correctly?
a)
Mass is measured in grams
b)
Volume is measured in meters
c)
Length is measured in liters
d)
None of the above are matched correctly
18.
This question has two parts. First, answer Part 1. Then, answer Part 2.
Part 1
3. Which is a physical property of calcium?
a)
It burns with a red flame.
b)
It has a density of 1.54 g/cm3
c)
It reacts readily with air
d)
It helps form the compound calcium carbonate.
19.
This question has two parts. First, answer Part 1. Then, answer Part 2.
Part 1
3. Which is a physical property of calcium?
A. It burns with a red flame.
B. It has a density of 1.54 g/cm3.
C. It reacts readily with air.
D. It helps form the compound calcium carbonate.
Part 2
4. Which best explains the correct answer to Part 1?
a)
The property pertains to the calcium's phase changes
b)
The property indicates how calcium combines with other elements
c)
The property can be observed without altering calcium's identity.
d)
The property predicts what will happen when calcium is heated
20.
Approximately 300 mL of water is dissolved into 700 mL of ethylene glycol to make 1 L of antifreeze.
How should the ethylene glycol be classified?
a)
solute
b)
product
c)
solvent
d)
element
21.
Which of the following is a chemical property of copper?
a)
Conducts electricity
b)
Reacts with oxygen to form copper oxide
c)
Boiling point of 120°C
d)
Shiny or lustrous
22.
Which of the following is a chemical property of fluorine
a)
Fluorine reacts violently with metals
b)
Fluorine is a gas at room temperature
c)
Fluorine is pale yellow-green in color
d)
Fluorine does not conduct electricity
23.
Which is a chemical property of chlorine?
a)
It is corrosive
b)
It has a crystalline structure as a solid.
c)
It has a melting point of -101 °C
d)
It is a colored gas at room temperature.
24.
This question has two parts. First, answer Part 1. Then, answer Part 2.
Part 1
3. Which is a chemical property of chlorine?
A. It is corrosive.
B. It has a crystalline structure as a solid.
C. It has a melting point of -101 °C.
D. It is a colored gas at room temperature.
Part 2
4. Which best explains the correct answer to Part 1?
a)
The property helps one predict what uses chlorine may have
b)
The property can change without chlorine's identity being changed.
c)
The property can be measured without changing chlorine's identity.
d)
The property is observed when chlorine transforms into another substance
25.
Which is a chemical property of sodium bicarbonate?
a)
color
b)
pH
c)
boiling point
d)
solubility
26.
1. Which element has the greatest atomic radius?
a)
Neon
b)
Hafnium
c)
Indium
d)
hydrogen
27.
This question has two parts. First, answer Part 1. Then, answer Part 2.
Part 1
1. Which element has the greatest atomic radius?
A. neon
B. hafnium
C. indium
D. hydrogen
Part 2
2. How does the organization of the periodic table helps answer Part 1.
a)
Atomic radius decreases from top to bottom down a group and increases from left to right across a period.
b)
Atomic radius decreases from top to bottom down a group and from left to right across a period.
c)
Atomic radius increases from top to bottom down a group and from left to right across a period.
d)
Atomic radius increases from top to bottom down a group and decreases from left to right across a period
28.
Which of the following is a semimetal?
a)
N
b)
K
c)
Si
d)
Br
29.
Which section of the periodic table contains only nonmetals?
a)
Group 2
b)
Group 18
c)
Period 2
d)
Period 6
30.
Which element has the lowest boiling point?
a)
Ar
b)
Si
c)
Mg
d)
Na
31.
How many protons, neutrons, and electrons are in I-131 (order: protons, neutrons, electrons)
a)
53, 78, 53
b)
53, 78, 54
c)
78, 53, 78
d)
53, 131, 53
32.
How many protons, neutrons, and electrons are in Ir-193 (order: protons, neutrons, electrons)
a)
77, 116, 76
b)
193, 116, 193
c)
116, 77, 193
d)
77, 116, 77
33.
Which are components of an atom's nucleus?
a)
Protons & electrons
b)
Protons & Neutrons
c)
Neutrons & electrons
d)
Protons, Neutrons & electrons
34.
What is the charge of an atom's nucleus?
a)
Neutral
b)
Negative
c)
Positive
35.
What best explains why lead-207 and lead-208 share the same atomic number?
a)
They share the same atomic mass
b)
They share the same number of valence electrons
c)
They share the same number of protons
d)
They share the same number of subatomic particles
36.
Which of the following is the correct longhand electron configuration for sulfur?
a)
1s2 2s2 2p4
b)
1s2 2s2 2p6 3s2 3p6
c)
1s2 2s2 2p6 3s2 3p4
d)
1s2 2s2 2p6
37.
Write the shorthand electron configuration for chlorine
a)
[Ar]
b)
[Ne] 2s2 3p5
c)
[He] 2s2 2p6 3s2 3p5
d)
[Ne] 3s2 3p5
38.
Nitrogen has an average atomic mass of 14.007. Predict the nitrogen isotope that you would find the greatest amount of in the universe
a)
N-12
b)
N-13
c)
N-14
d)
N-15
39.
How many dots will surround Fluorine (F) in its Lewis Dot symbol?
a)
1
b)
2
c)
7
d)
8
40.
Which of the following phase changes describes a solid to a liquid
a)
Freezing
b)
Melting
c)
Evaporation
d)
sublimation
41.
Substances in the ________ phase, particles are arranged in a highly ordered/organized structure and vibrating back and forth
a)
Solid
b)
Liquid
c)
Gas
d)
Plasma
42.
On a hot day, drops of water form on the outside of a glass of iced tea.
What best explains this phenomenon?
a)
A. The cold glass causes water molecules in air to lose energy as they transfer heat to the glass.
b)
Water molecules in air collide with glass molecules to release energy during an exothermic reaction
c)
As the ice in the glass melts, the water molecules gain energy and travel through the glass via osmosis.
d)
Energy from the cold glass is absorbed by the water molecules in air, causing them to form drops of liquid water.
43.
Which of the following is an example of a physical change?
a)
Ice crushing
b)
Iron Rusting
c)
apple rotting
d)
wood burning
44.
An insoluble product (solid) produced during a chemical reaction in solution is called a:
a)
Catalyst
b)
Precipitate
c)
Reactant
d)
Spectator Ion
45.
Twenty milliliters (mL) of one chemical was poured into a glass beaker containing 20 mL of another chemical. Both chemicals were clear to begin with and remained clear after they were mixed. The resulting mixture was monitored for some time. After several hours, small crystals had formed in the beaker. The remaining liquid's volume had decreased by 5 mL.
Which most clearly indicates that a chemical change has occurred?
a)
that crystals formed
b)
that the mixture's volume decreased
c)
that the chemicals remained clear
d)
that the chemicals were mixed
46.
Which is the best indicator that a chemical change has taken place?
a)
change in density
b)
change in odor
c)
change in pressure
d)
change in viscosity
47.
____________ is the measure of average kinetic energy of molecular motion and ____________ is the total kinetic energy of molecular motion
a)
Temperature, heat
b)
Heat, temperature
c)
Heat, heat
d)
Temperature, temperature
48.
A form of matter with a constant volume and constant shape:
a)
Liquid
b)
Plasma
c)
Solid
d)
Gas
49.
Which best describes one of the basic assumptions of kinetic molecular theory?
a)
Most of the volume of a gas is empty space.
b)
Gas particles are strongly repelled by one another.
c)
Some gas particles are attracted to solid and liquid particles.
d)
The kinetic energy of a collection of gas particles remains constant.
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