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Exam 2: Chemistry Comes Alive

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Question 31

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An atom with three electrons would have a valence of _.

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Question 32

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Figure 2.1Using Figure 2.1, match the following: -Weak acids and bases make good _ .

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Question 33

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Why is it possible for us to drink a solution that contains a mixture of equal concentration of a strong acid and a strong base, either of which, separately, would be very caustic?

Which of the following is an example of a suspension?

Current information suggests that omega- 3 fatty acids decrease the risk of heart disease.

The pH of body fluids must remain fairly constant for the body to maintain homeostasis.

Amino acids joining together to make a peptide is a good example of a(n) reaction.

Figure 2.2Using Figure 2.2, match the following: -Thymine

The molecule directly provides energy for cellular work.

The acidity of a solution reflects the free hydrogen ions in the solution

Lipids are a poor source of stored energy.

When a set of electrodes connected to a light bulb is placed in a solution of dextrose and a current is applied, the light bulb does not light up. When the same unit is placed in HCl, it does. Why?

The numbers listed represent the number of electrons in the first, second, and third energy levels, respectively. On this basis, which of the following is an unstable or reactive atom?

Which of the following would be regarded as an organic molecule?

In the compound H₂CO₃, what do the numbers 2 and 3 represent?

A 23- year- old male was riding his road bike in 100- degree heat, when he suddenly became nauseated and weak. He called 911 from his cell phone. When the ambulance came, the paramedics started intravenous therapy for severe dehydration. Explain the critical role of water to maintain homeostasis.

In a DNA molecule, the phosphate serves .

Which of the following statements is false?

What advantages does ATP have in being the energy currency molecule?

Glucose is an example of a monosaccharide.