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- 1. Multiple Choice
Which of the following foods contains complex carbohydrates?
potato
fruit juice
corn syrup
table sugar
- 2. Multiple Choice
Ethane (C2H6) is one of many compounds that burns in oxygen to form carbon dioxide and water, as represented by the equation below. Which substance is a product in this reaction? C2H6+O2 --> CO2+H2O
carbon (C)
oxygen (O2)
water (H2O)
ethane (C2H6)
- 3. Multiple Choice
Which of the following best distinguishes a nuclear reaction from other types of reactions?
a reaction in which energy is released
a reaction in which electrons are shared
a reaction in which electrons are transferred
a reaction that affects the nucleus of an atom
- 4. Multiple Choice
The image above shows a chemical reaction taking place. What can you infer about this reaction?
mass is not conserved
the reaction is exothermic
the reaction is endothermic
there are reactants but no products
- 5. Multiple Choice
Which change will most likely lead to an increase in the rate of a chemical reaction?
removing a catalyst
lowering the temperature
increasing the surface area of reactants
decreasing the concentration of reactants
- 6. Multiple Choice
Glucose (C6H12O6) is a kind of sugar molecule. How many atoms are in a molecule of glucose?
6
12
18
24
- 7. Multiple Choice
The following chemical reactions represent two different chemical reactions:
3NaOH+H3PO4 --> Na3PO4+3H2O
2Mg+O2 --> 2MgO
Based on these equations, which statement is true?
MgO is a reactant in one of the chemical reactions
Na3PO4 is a product in one of the chemical reactions
H3PO4 shows that three atoms of oxygen are involved in the reaction
O2 is a catalyst
- 8. Multiple Choice
Which statement about carbon molecules is true?
They may take the form of rings
They never take the form of rings
They always take the form of long chains
They rarely contain more than two carbon atoms
- 9. Multiple Choice
Carbon-6 undergoes beta-minus decay, during which a neutron becomes a proton, an electron, and an antineutrino. What happens to the carbon atom during this process?
Its mass number increases by 1
Its mass number decreases by 1
Its atomic number increases by 1
Its atomic number decreases by 1
- 10. Multiple Choice
What is the source of the large amount of energy produced in a nuclear fission reaction?
Some mas is converted to energy
Energy for fission reactions is provided by the sun
The Earth's oceans provide water used in fission reactions
Electrons from large atoms are converted into gamma rays
- 11. Multiple Choice
What causes an atom to undergo radioactive decay?
An unstable atom decays to become stable
An isotope decays to form a different type of isotope
An atom with a small nucleus decays to form a larger nucleus
An atom with a low number of electrons decays to gain electrons
- 12. Multiple Choice
Proteins, such as hair and nails, are polymers. Which of the following models best represents a polymer?
a chain made of identical links
a car made of many different parts
a bowling ball made of a solid material
a carpet made of many individual fibers
- 13. Multiple Choice
Which term best describes a carbon atom with an oxygen atom and an -OH bonded to it?
a polymer
an alcohol
a carboxyl
an aromatic compound
- 14. Multiple Choice
Which of the following is carbon most likely to bond with to form organic compounds?
silver
helium
sodium
hydrogen
- 15. Multiple Choice
What unique property of carbon enables it to form a huge variety of compounds?
Carbon is a solid at room temperature.
Carbon is a nonmetal that is dull and brittle.
Carbon atoms can have different numbers of neutrons.
Carbon atoms can form four bonds with up to four other atoms.
- 16. Multiple Choice
Which takes place when a chemical change occurs?
Bonds connecting atoms in products and reactants form.
Bonds connecting atoms in products and reactants break.
Bonds connecting atoms in reactants break, and bonds connecting atoms in products form.
Bonds connecting atoms in reactants form, and bonds connecting atoms in products break.
- 17. Multiple Choice
Which of the following is an example of an endothermic reaction?
a cake baking
a candle burning
a firework exploding
a piece of wood smoldering
- 18. Multiple Choice
Why does increasing the temperature generally increase the rate of a chemical reaction?
It increases the amount of reactant.
It decreases the size of the reactant particles.
It causes the particles of the reactants to move faster and collide more often.
It increases the space between reactant particles so they have more room to move apart.
- 19. Multiple Choice
When coal is burned, sulfur is released into the atmosphere, where it reacts with oxygen to produce sulfur dioxide and sulfur trioxide. Which of the following is true of this process?
The identity of each reactant remains the same.
Sulfur dioxide and sulfur trioxide are the reactants in this change.
The products have different chemical properties than those of the reactants.
The products contain more sulfur atoms and fewer oxygen atoms than the reactants.
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