Chemistry Comprehensive Exam

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Directions: Please read each question and its answers carefully. Some questions will have more than one answer that sounds correct; pick the best possible answer. You must complete the exam in one session, so please ensure you have enough time to complete the entire test. Feel free to use scrap paper.

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1. What part of an atom determines its chemical reactivity?

1 point

A. The number of protons

B. The number of electrons

C. The number of VALENCE electrons

D. The number of neutrons

Clear selection

2. A substance that contains only one type of atom is called a(n) ______________ .

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A. compound

B. Element

C. molecule

D. Ion

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3. A bond is formed between the ____________ of two or more atoms

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A. electrons

B. protons

C. neutrons

D. orbitals

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4. Which type of bond is formed when atoms share electrons?

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A. covalent

B. ionic

C. metallic

D. Polar bond

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5. Which type of bond is formed between a metal and nonmetal, such as in sodium chloride?

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A. Covalent

B. ionic

C. metallic

D. Polar bond

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6. The molecular formula for glucose is C6H12O6 . One molecule of glucose contains a total of ___ atoms, and ____ elements.

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A. 12 , 24

B. 6 , 12

C. 24 , 3

D. 3 , 24

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7. Atoms whose valence shell is completely full of electrons are __________

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A. Highly reactive

B. Highly stable

C. Metallic

D. Solids at room temperature

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Use the image showing a portion of the Periodic Table in order to answer the next 4 questions.

8. Which element has an atomic number of 12?

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A. Carbon

B. Sodium

C. Silicon

D. Magnesium

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9. Which element has nine electrons, and nine protons?

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A. Beryllium

B. Fluorine

C. Carbon

D. Potassium

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10. Which element has 12 neutrons?

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A. Nitrogen

B. Potassium

C. Sodium

D. Neon

Clear selection

11. Which column of elements has only one valence electron, making the atoms in this column very reactive?

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A. Column 1A

B. Column 2A

C. Column 4A

D. Column 8A

Clear selection

Use the following information, and chart below, to answer the next 6 questions. A lab team of scientists set up a controlled experiment to test the effect of caffeine on tomato plant growth. They set up five groups, with different amounts of caffeine exposure in each group. They used the same soil, same amount of light, same sized pots, same amount of water, same watering times, and the same temperature of the room. They had four plants in each condition.

Data Table 1: Growth Rate of Tomato Plants Watered with Varying Concentrations of Caffeinated Water Over 4 Weeks

111. What is the independent (manipulated) variable in this experiment?

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A. The growth rate of the tomato plants

B. The type of soil being used

C. The caffeine

D. The plants that got exposed to caffeine

Clear selection

112. Which of the following is an example of a constant in this experiment?

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A. The type of soil

B. The amount of sunlight

C. The number of plants in each group

D. The amount of water used

E. All of the above

Clear selection

113. What does the data suggest about the effect of caffeine on tomato plant growth?

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A. Caffeine does not significantly affect plant growth in low doses

B. Caffeine increases the rate of plant growth

C. Above a certain concentration, caffeine is damaging/deadly to the plant

D. Caffeine stunts a plant's growth

E. Answers A and C

Clear selection

114. The growth rate of the tomato plants exemplifies which term from below ?

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A. Constant

B. Control Group

C. Dependent (responding variable)

D. Independent (manipulated variable)

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115. How could scientists increase their confidence that the results of this experiment are reliable?

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A. Ignore the 0.5 mg/L and 1.0 mg/L

B. Repeat the experiment

C. Add another chemical into the test, like Taurine

D. Put one plant in the dark

Clear selection

116. What is one major flaw in this experiment?

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A. Scientists should have given the plants more sunlight

B. It is backwards; the scientists should be testing the affect of plant growth on caffeine

C. There should be less than four plants in each condition

D. The experiment lacks a control group

Clear selection

117. Which of the following is NOT an example of an organic molecule?

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A. CH(4) - Methane

B. C(6)H(12)O(6) - Glucose

C. H(2)SO(4) - Sulfuric Acid

D. CH(2)O - Methanal

Clear selection

Who is the scientist that first organized the periodic table?

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Rutherford

Democtritus

Niels Bohr

JJ Thompson

Dmitri Medeleev

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The periodic table is organized according to atomic weight

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True

False

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Which group of elements are completely un-reactive?

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alkaline earth metals

lanthanoids and actinoids

halogens

alkali metals

noble gases

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Which group of elements are so reactive that they must be stored in special ways to keep them from reacting with the atmosphere?

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halogens

noble gases

alkali metals

lanthanoids and actinoids

transition metals

alkaline earth metals

Clear selection

Which group is made up of extremely reactive gasses?

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halogens

lanthanoids and actinoids

transition metals

alkali metals

noble gases

alkaline earth metals

Clear selection

Which group do gold, silver, platinum, and iron belong to?

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alkali metals

alkaline earth metals

halogens

noble gases

lanthanoids and actinoids

transition metals

Clear selection

Where do the lanthanoids and actinoids actually belong on the periodic table?

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between the halogens and noble gases

between the alkaline earth metals and the transition metals

dispersed randomly throughout the table

between the alkali and alkaline earth metals

below all the other elements

Clear selection

118. Which of the following properties make carbon atoms so versatile?

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A. Carbon can form single, double, and triple bonds

B. Carbon can form rings, branching structures, and linear chains

C. Carbon has four valence electrons; allowing it to form up to four covalent bonds

D. All of the above

Clear selection

119. Monosaccharide is to ______ as amino acid is to ________ .

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A. polysaccharide , polypeptide

B. polysaccharide , nucleic acid

C. protein , nucleotide

D. sucrose , DNA

Clear selection

120. Which of the following is true about Dehydration Synthesis reactions?

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A. They result in longer molecules

B. Water is formed as a byproduct

C. They occur when monomers are bonded together

D. All of the above

Clear selection

121. What is the relationship between hydrolysis reactions, and dehydration synthesis reactions?

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A. They are the opposite reaction

B. Hydrolysis occurs in carbohydrates, while dehydration synthesis occurs in proteins

C. They are different terms for the same process

D. None of the above

Clear selection

122. From where do your cells get the raw materials they need to grow, repair, and replicate?

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A. From the oxygen you breathe

B. From the photosynthesis that your cells perform

C. From other cells

D. From the food you eat

Clear selection

Use the images below to answer the next four questions.

123. Which letter is incorrectly matched to the term?

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A. monosaccharide

B. amino acid

C. polypeptide

D. Nucleotide

Clear selection

124. Which molecule is used to build starch?

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Molecule A

Molecule B

Molecule C

Molecule D

Clear selection

125. Which molecule is found in abundance in chicken?

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Molecule A

Molecule B

Molecule C

Molecule D

Clear selection

126. Which molecule would a bear store in its body as a source of calories during its winter hibernation?

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Molecule A

Molecule B

Molecule C

Molecule D

Clear selection

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