Q: If you have 2 moles of $$H_2O$$, how many molecules of water do you have? (Avogadro's number $$= 6.022 \times 10$$^{23}$$)

$$1.2044 \times 10$$^{24}$$ molecules

Question 1

Which subatomic particle is responsible for the positive charge of the atomic nucleus?

Accepted Answer

Proton

Question 2

Given the atomic number of carbon is 6, how many protons and neutrons are present in the most common isotope of carbon ($$^{12}C$$)?

Accepted Answer

6 protons, 6 neutrons

Question 3

Which of the following best describes the role of hydrogen bonds in water?

Accepted Answer

They keep water molecules 'stuck together', resulting in a high boiling point

Question 4

If a solution has a hydrogen ion concentration of $$[H^+] = 1 	imes 10$$^{-5}$$ M, what is its pH?

Accepted Answer

$$pH = 5$$

Question 5

Which element is found in higher concentration inside the cell than outside?

Accepted Answer

Potassium ($$K^+)$$

Question 6

Which type of bond involves the complete transfer of electrons from one atom to another?

Accepted Answer

Ionic bond

Question 7

A buffer system in the blood involves the following equilibrium: $$H_2CO_3 \rightleftharpoons $$HCO_3$$^- + H^+. $$What is the primary function of this buffer?

Accepted Answer

To minimize changes in pH when acids or bases are added

Question 8

Which of the following statements about the periodic table is correct?

Accepted Answer

The group number tells the number of valence electrons

Question 9

Which of the following is a trace element essential for oxygen transport in the blood?

Accepted Answer

Iron ($$Fe)$$

Question 10

A solution is made by dissolving 0.1 mol of NaCl in 1 L of water. What is the solvent in this solution?

Accepted Answer

Water

Question 11

Which of the following best explains why metals tend to form cations?

Accepted Answer

Metals have very low electron affinity and easily give up electrons

Question 12

Which of the following molecules is polar and hydrophilic due to unequal sharing of electrons?

Accepted Answer

$$H_2O$$

Question 13

If you have 2 moles of $$H_2O$$, how many molecules of water do you have? (Avogadro's number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$1.2044 	imes 10$$^{24}$$ molecules

Question 14

Which of the following is NOT one of the major elements that make up 99% of living organisms (COHN)?

Accepted Answer

Calcium

Question 15

A strong acid, when added to water, will:

Accepted Answer

Completely dissociate into ions

Question 16

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation is a positively charged ion, an anion is negatively charged

Question 17

Which of the following is true about water in the human body?

Accepted Answer

It makes up approximately 2/3 of body weight

Question 18

If you add NaOH to water, what happens to the concentration of $$H^+$$ ions?

Accepted Answer

It decreases

Question 19

Which of the following best describes a solution?

Accepted Answer

A solvent containing the solute

Question 20

Which of the following elements is a major mineral/electrolyte important for nerve conduction and muscle contraction?

Accepted Answer

Potassium ($$K^+)$$

Fundamental Chemistry Concepts for Anatomy & Physiology

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