TEST NAME: ES 2.2
TEST ID: 62430
GRADE: 11
SUBJECT: Life and Physical Sciences
TEST CATEGORY: My Classroom
ES 2.2
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Student: Class:
Date:
1. After Jimmy placed raw potato slices and hydrogen peroxide
in a plastic bag, he concluded that an
exothermic reaction had taken place. Which of the following supports Jimmy’s conclusion?
A.
The plastic bag got cooler.
B.
The plastic bag got warmer.
C.
The potatoes changed color.
D.
The hydrogen peroxide
bubbled.
2. When magnesium is burned in the presence of oxygen, it produces magnesium oxide according to the
following chemical equation.
If 3.45 grams of Mg are burned, how many grams of MgO are produced?
A.
8.69
B.
5.72
C.
4.35
D.
3.45
3. Belinda investigated the reaction that occurred when two effervescent tablets were put into a beaker
containing 100 mL of water. She observed that the tablets fizzed and released gas bubbles. The tablets
dissolved. The temperature of the water went from 22°C to 19°C.
Which is the best conclusion for this experiment?
A.
The energy conversion that occurred in this beaker involved the nuclei of the atoms of the tablets.
B.
An endothermic reaction occurred because heat energy was absorbed from the water.
C.
A physical change occurred when the tablets dissolved in the water.
D.
The gas came from boiling water in the beaker.
ES 2.2
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4. What is the volume of 12.0 grams of oxygen gas at STP? A.
4.20 liters
B.
8.40 liters
C.
16.8 liters
D.
22.4 liters
5. The chemical reaction shows the production of ethene and water from ethanol.
What is the percent yield if this reaction produced 55.0 g of ethene from 100.0 g of ethanol?
A.
3.6%
B.
55%
C.
61%
D.
90%
6. The diagram represents the energy in a reaction.
Which conclusion about the reaction is best represented by the diagram?
A.
Energy was destroyed.
B.
Energy was created.
C.
Energy was released.
D.
Energy was absorbed.
7. What happens to the chemical energy in methane’s bonds when methane reacts with oxygen and forms
and
?
A.
It is released as heat.
B.
It generates a current.
C.
It increases product mass.
D.
It is transformed into neutrons.
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8. Hydrogen and nitrogen react to produce ammonia gas as shown in the following chemical equation.
How many grams of hydrogen must react to produce 31.5 grams of ammonia?
A.
5.60
B.
3.73
C.
2.49
D.
1.64
9. Magnesium chloride has an atomic mass of 94 amu. What is the mass of one mole of magnesium chloride?
A.
3 g
B.
47 g
C.
94 g
D.
188 g
10. Which is an indication that a chemical change is taking place?
A.
Iron changes color when heated.
B.
Gas bubbles form in boiling water.
C.
Solid wax forms when melted wax falls in ice water.
D.
A gas forms when vinegar and baking soda are mixed.
11. Oxygen reacts with iron to produce rust and with hydrogen to produce water. Which statement describes
both reactions?
A.
A different mixture is formed in each case.
B.
A different solution is formed in each case.
C.
Both a change of state and of elements is involved.
D.
New molecules are formed but the same elements exist.
12. Which best describes an exothermic reaction?
A.
a physical change occurs
B.
equal amounts of products are produced
C.
energy is required
D.
energy is released
13. Which event is an example of a chemical change?
A.
fog rising off a river
B.
wood burning in a fireplace
C.
ice cream melting in the sunshine
D.
grinding peppercorn into pepper flakes
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14. The chemical equation shows the production of magnesium chloride.
How many grams of H2 will be produced from 12 grams of Mg?
A.
1.0
B.
2.0
C.
3.0
D.
4.0
15. The reaction between FeS and
How many liters of
A.
1.2
B.
2.5
C.
3.8
D.
7.6
shown below produces the gas
.
gas, at STP, will be produced from 3.1 grams of oxygen?
16. When coal burns, the reaction
A.
releases heat and is endothermic.
B.
releases heat and is exothermic.
C.
absorbs heat and is endothermic.
D.
absorbs heat and is exothermic.
17. The chemical equation shows the reaction between sodium bicarbonate and hydrochloric acid to produce
sodium chloride, water, and carbon dioxide.
A teacher reacts 84.0 g of sodium bicarbonate with excess hydrochloric acid. What is the percent yield for
sodium chloride if 56.0 g of sodium chloride is produced?
A.
4.20%
B.
8.01%
C.
92.0%
D.
95.8%
18. Which reaction is endothermic?
A.
cold pack
B.
coal burning
C.
striking a match
D.
charcoal grill fire
19. Which of these describes a chemical property?
ES 2.2
A.
the color of the substance
B.
the hardness of the substance
C.
how the substance behaves in the presence of an acid
D.
how the substance behaves in the presence of a magnet
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20. Biochemical reactions in the body, such as the formation of lactose, require energy. The diagram shows the
formation of lactose in mammalian cells.
What happens to the energy required for lactose synthesis?
A.
It is released outside of the cell in the form of heat.
B.
It is absorbed by the enzyme controlling the process.
C.
It is used to transport water across the cell membrane.
D.
It is stored in the chemical bonds of the lactose molecule.
21. The chemical reaction shows the production of sulfur trioxide.
Which of the following reactant quantities would make oxygen gas the limiting reagent?
A.
2 mol
: 1 mol
B.
2 mol
: 2 mol
C.
3 mol
: 1 mol
D.
2 mol
: 3 mol
22. Magnesium burns in air according to the balanced equation below.
Which of the following best characterizes this reaction?
A.
endothermic double replacement reaction
B.
endothermic single replacement reaction
C.
exothermic decomposition reaction
D.
exothermic synthesis reaction
23. A student concludes that a chemical reaction performed in a classroom investigation was exothermic. To
communicate the validity of this conclusion, which would make the best visual evidence in a presentation?
A.
photographs of reactants and products
B.
listing of masses of reactants and products
C.
listing of time from start to finish of reaction
D.
photograph of a flame produced when the chemicals reacted
24. Which of the following is most likely an exothermic chemical change?
A.
melting ice cream
B.
falling rocks
C.
burning paper
D.
breaking glass
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25. Which activity is an example of a chemical change?
A.
sugar dissolving in water
B.
water evaporating in air
C.
lighting a match
D.
freezing water
26. The reaction shows the decomposition of calcium carbonate.
What is the percent yield if 60.0 g of CaCO3 is heated and 15.0 g of CaO is produced?
A.
33.6%
B.
44.6%
C.
55.4%
D.
66.4%
27. Jordana pulled a muscle while running at a track meet. Her coach gave her a self­heating pack to treat the
injury. The instructions on the box said to twist the pack until the liquids mix. Which type of energy contained
in the pack is responsible for producing the heat?
A.
chemical
B.
thermal
C.
mechanical
D.
electrical
28. The following chemical equation shows a reaction between aluminum and sulfuric acid to produce hydrogen
gas.
How many grams of aluminum must react with sulfuric acid to produce 2.6 L of hydrogen gas at STP?
A.
1.4
B.
2.1
C.
3.1
D.
5.8
29. Two chemicals are mixed in a test tube and a chemical reaction takes place. If this reaction is endothermic
and the test tube is touched, which of the following best describes what is felt?
A.
The test tube is cold.
B.
The test tube is warm.
C.
The test tube is very hot.
D.
The test tube is the same temperature as the air.
30. A hot pack is a product that releases heat when chemicals inside of it interact. What is taking place inside an
active hot pack?
ES 2.2
A.
electric current
B.
a net loss of mass
C.
thermal insulation
D.
an exothermic reaction
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ES 2.2
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