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Chemical Reactions Part 2
Test Description: Chemical Reactions the second part
Instructions: Answer all questions to get your test result.
1) Which statement correctly describes how the following chemical equation violates the law of conservation of mass? H2 + O2 → 2HO2
A
There are more oxygen atoms on the right side of the arrow then on the left side.
B
There are more hydrogen atoms on the right side of the arrow then on the left side.
C
There are more hydrogen atoms on the left side of the arrow then on the right side.
D
There are the same number of hydrogen atoms on the left side of the arrow as there are on the right side.
2) When a chemical reaction takes place, the reaction must end with the same _____________ it began with.
A
number of gases
B
physical changes
C
state of matter
D
type of molecules
3) In chemical reactions, the number of atoms in the product is __________.
A
less than the number of atoms in the reactants
B
greater than the number of atoms in the reactants
C
the same as the number of atoms in the reactants
D
the same as the number of molecules in the reactants
4) The mass of the reactants in a chemical reaction is 4.00 kg. After the reaction takes place completely, there will be __________.
A
2.00 kg of reactants
B
2.00 kg of products
C
4.00 kg of products
D
4.00 kg of reactants
5) n a chemical reaction you begin with 18 atoms. When the reaction is over you would expect to have __________ atoms remaining.
A
less than 18
B
18
C
there is not enough information
D
more than 18
6) Which of the following statements is true regarding the Law of Conservation of Mass?
A
It is fundamental to the idea of balancing chemical reactions
B
It accounts for the fact that in a chemical equation the mass of the products has to be equal to the mass of the reactants.
C
All of these are true.
D
It reinforces the idea that atoms are the fundamental building block of matter.
7) When liquid H2O is chemically separated in a scientific investigation it forms H2 gas and O2 gas. If the number of hydrogen and oxygen molecules does not change through the equation, then the mass will
A
increase from products to reactants.
B
stay the same from reactants to products.
C
decrease from reactants to products.
D
increase from reactants to products.
8) Meals, Ready to Eat are an instant hot meal developed by the U.S. military for troops. The meal heats up when water is added to the magnesium metal tray because the chemical reaction between water and magnesium is an _________.
A
evaporation reaction
B
exothermic reaction
C
endothermic reaction
D
energy conserving reaction
9) Meals, Ready to Eat are an instant hot meal developed by the U.S. military for troops. The meal heats up when water is added to the magnesium metal tray because the chemical reaction between water and magnesium is an _________.
A
this is an example of an endothermic reaction
B
this is an example of an exothermic reaction
C
energy was absorbed during this reaction
D
the temperature decreased
10) If you wanted to design a product that cooked food without electricity, you might consider using chemicals that when mixed:
A
absorbed energy
B
reacted exothermically
C
just have a physical change
D
reacted endothemically
11) Mixing hydrochloric acid and sodium hydroxide is an example of an exothermic reaction. If you were holding a beaker while this chemical reaction took place, then you would expect it to feel _______ after the reaction was complete.
A
none of these are correct
B
warmer
C
colder
D
no change in temperature
12) When substances are mixed, changes in heat energy provide evidence to show if a chemical reaction or a physical change has occurred. In chemical reactions, heat energy is often
A
created and destroyed
B
destroyed
C
created only
D
released or absorbed
13) Photosynthesis is a chemical reaction where energy is absorbed. A reaction where energy is absorbed is known as an __________.
A
entropic reaction
B
endothermic reaction
C
exothermic reaction
D
acid-base reaction
14) Mixing baking soda and vinegar is an example of an endothermic reaction. If you were holding a beaker while this chemical reaction took place, then you would expect it to feel _______ after the reaction was complete.
A
no change in temperature
B
warmer
C
none of these
D
colder
15) Cellular respiration is an example of a chemical reaction where energy is released. Which of the following is a reaction where energy is released?
A
dissolution reaction
B
acid-base reaction
C
endothermic reaction
D
exothermic reaction
16) Mixing baking soda and vinegar is an example of an endothermic reaction. This means:
A
energy is taken in during the chemical reaction
B
baking soda and vinegar are products in this reaction
C
there is no change in energy in the chemical reaction
D
energy is released in the chemical reaction
17) An iceberg melting in an ocean is an example of an endothermic process because:
A
The iceberg absorbs thermal energy from the surrounding water.
B
The iceberg releases thermal energy from the surrounding water.
C
A chemical reaction occurs between the iceberg and the ocean.
D
It affects nearby wildlife.
18) Changes in the total amount of thermal energy provide evidence that chemical reactions have taken place. A chemical reaction in which energy has been absorbed is known as a(n):
A
endothermic reaction
B
reversible reaction
C
physical reaction
D
exothermic reaction
19) Mixing hydrochloric acid and sodium hydroxide is an example of an exothermic reaction. This means:
A
hydrochloric acid and sodium hydroxide are the products of the reaction.
B
Energy is taken in during the chemical reaction.
C
There is no change in energy during the chemical reaction.
D
Energy is released during the chemical reaction.
20) Changes in thermal energy provide evidence that a chemical reaction has occurred. Which of the following BEST describes a chemical reaction in which energy is released?
A
reversible reaction
B
endothermic reaction
C
physical reaction
D
exothermic reaction
*select an answer for all questions
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