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Unit One Practice Exam

Unit 1 Practice Exam


1. Potassium has ____ electrons in it's valence shell

A. 4

B. 5

C. 6

D. 7

E. None of the above


2. A nitrogen atom has:

A. 7 protons, 6 electrons

B. 4 protons, 3 electrons

C. 5 protons, 5 electrons

D. 7 protons, 7 electrons

E. None of the above


3. Nitrogen normally will make ___ bonds

A. 3 covalent bonds

B. 2 covalent bonds, 1 ionic bond

C. 2 covalent bonds

D. 1 ionic bond

E. 1 covalent bond


4. Which statement is true

A. Hydrogen is more electronegative than oxygen, thus they make a polar covalent bond

B. Hydrogen is less electronegative than nitrogen, thus they make a non-polar covalent bond

C. Hydrogen is the same electronegativity as oxygen, thus they make a non-polar covalent bond

D. Hydrogen is more electronegative than carbon, thus they make a polar covalent bond

E. Hydrogen is less electronegative than nitrogen, thus they make a polar covalent bond


5. Hydrogen bonds are formed when:

A. Hydrogen ions can bond to a hydroxyl group

B. The partial positive charge on hydrogen is attracted to a partial negative charge

C. The partial negative charge on hydrogen is attracted to a partial positive charge

D. Hydrogen bonds to itself

E. None of the above


6. Adhesion, Cohesion, Surface Tension, and water's High Specific Heat are all caused by:

A. Ionic Bonds

B. Covalent bonds between water molecules

C. Hydrogen bonds

D. Non-polar covalent bonds

E. Hydrophobic attractions

 

7. How much NaCl would you need to put in 2 liters of water to make a 1M solution

A. 58g

B. 116g

C. 35g

D. 23g

E. 220g


8. What would the [H] concentration be in a lake that has a pH of 5

A. 105

B. 109

C. 10-9

D. 10-5

E. 510


9. A solution at pH 10 is...

A. 10 times as basic as a solution at pH 9

B. 10 times as acidic as a solution at pH 9

C. 10/9 times as basic as a solution at pH 9

D. 9/10ths as basic as a solution at pH 9

E. Extremely acidic


10. Fats are hydrophobic due to:

A. Their ester bonds

B. Their hydrocarbon tails

C. Glycerol being hydrophobic

D. Lots of hydroxyl groups

E. It's large size


11. CH3-CH2-CH2-CH3 and CH3-CH-CH3 are

|

CH3

A. Geometric Isomers

B. Enantiomers

C. Structural Isomers

D. Isotopes

E. The exact same molecule


12. Polymers are made from monomers via

A. Hydrolysis

B. Ionic bonds

C. Dehydration reactions

D. Weak bonds

E. Peptide bonds


13. Entropy means

A. Light Energy

B. Energy that can't be used for work

C. Chemical Energy

D. Potential Energy

14. If a reaction gives off heat then it is likely...

A. Anabolic and endothermic

B. Anabolic and exothermic

C. Catabolic and endothermic

D. Catabolic and exothermic

E. None of the above


15. In endergonic reactions, the products have

A. More free energy than the reactants

B. Less free energy than the reactants

C. The same amount of energy as the reactants

D. It depends on the enzyme used

E. It depends on the activation energy


16. We stopped the reactions in our lab using Sulfuric Acid, this is because...

A. The sulfuric acid reacted with the hydrogen peroxide, ending the reaction

B. The sulfuric acid competes with the catalase for hydrogen peroxide

C. The sulfuric acid changes the pH of the environment

D. The sulfuric acid binds to the catalase

E. None of the above


17. As temperature goes up, the effect of entropy

A. Increases

B. Decreases

C. Stays the same

D. Depends on the free energy

E. Depends on the enthalpy


18. O

||

CH3-C-H

The above molecule is

A. A carboxylic acid

B. A ketone

C. An alcohol

D. A thiol

E. An aldehyde


19. Glycogen is

A. A protein found in animals

B. A protein found in plants

C. A carbohydrate found in plants

D. A carbohydrate found in animals

E. A lipid found in both plants and animals


20. Draw and label a ketone, an aldehyde and a carboxyl group below.

 

 

Answer Key 


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