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Which of the following pairs shows isotopes of the same element?
1. $""_6 ^12C and ""_6 ^12C$
2. $""_6 ^14C and ""_7 ^14N$
3. $""_6 ^14C and ""_6 ^12C$
4. $""_6 ^14C and ""_6 ^14C^-4$
Which of the following correctly summarizes cellular respiration?
1. $6 O_2 + C_6H_12O_6 = 6 CO_2 + 6 H_2O + "energy"$
2. $6 CO_2 + C_6H_12O_6 + "energy" = 6 CO_2 + 6 H_2O$
3. $6 CO_2 + 6 H_2O = 6 O_2 + C_6H_6O_6 + "energy"$
4. $6 CO_2 + 6 H_2O + "energy" = 6 O_2 + C_6H_12O_6$
Enzymes in your body act as catalysts. Thus, the role of enzymes is to
2. increase the rate of chemical reactions.
3. inhibit chemical reactions.
4. decrease the rate of chemical reactions.
Large organic molecules are called                .
1. Polymers
2. Carbohydrates
3. Micromolecules
4. Macromolecules
What type of reaction does the following equation represent?

$FeS + 2HCl rarr FeCl_2 + H_2S$
1. synthesis reaction
2. double-displacement reaction
3. single-displacement reaction
4. decomposition reaction
Oxygen is released during what part of photosynthesis?
1. Light Reactions
2. Calvin Cycle
3. Kreb's Cycle
4. Glycolysis
Which of the following is NOT produced when magnesium hydroxide is dissolved in water?
1. $"H"^+$
2. $"Mg"^"2+"$
3. $"OH"^-$
4. None of the above
Which of the following substances, when dissolved in water, increases the concentration of hydrogen ions?
1. $"H"_2"SO"_3$
2. NaOH
3. $"H"_2"O"$
4. $"SO"_2$
Which of the following substances, when dissolved in water, increases the concentration of hydroxide ions?
1. $"H"_3"PO"_4$
2. NaOH
3. $"H"_2"O"$
4. $"CO"_2$
The pH of a basic solution, like KOH (aq), would be
1. exactly 7
2. between 3 and 6
3. greater than 7
4. between 10 and 12
5. less than 7
Which compound is an Arrhenius acid?
1. $"SO"_2$
2. $"CaO"$
3. $"H"_2"SO"_4$
4. NaOH
1. $"H"^+$
2. $"OH"^-$
3. $"H"_3"O"^+$
4. $"H"_2"O"$
1. $"SO"_2$
2. $"HNO"_3$
4. $"H"_2"O"$