Question 1

Which of the following statements best describes an element?

Accepted Answer

A pure substance that cannot be broken down into simpler chemical entities by ordinary chemical reactions.

Question 2

Which group of elements is most abundant in the biological molecules of living things?

Accepted Answer

CHONPS: Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Sulfur

Question 3

A sodium atom ($$\mathrm{Na}) $$loses one electron to become a sodium ion ($$\mathrm{Na^+}). $$What type of bond is most likely to form between this sodium ion and a chloride ion ($$\mathrm{Cl^-}$$)?

Accepted Answer

Ionic bond

Question 4

Which of the following is a compound?

Accepted Answer

Water ($$\mathrm{H_2O})$$

Question 5

A carbon atom has an atomic number of 6 and an atomic mass of 12. How many neutrons does it have?

Accepted Answer

6

Question 6

Which of the following best describes a molecule?

Accepted Answer

A group of atoms held together by chemical bonds

Question 7

Which of the following is an example of a chemical synthesis reaction?

Accepted Answer

$$A + B \rightarrow AB$$

Question 8

What is the main function of a buffer in biological systems?

Accepted Answer

To resist dramatic changes in pH

Question 9

Which of the following pH values is most acidic?

Accepted Answer

2

Question 10

If blood becomes too basic, which reaction helps lower the pH?

Accepted Answer

$$H_2CO_3 \rightarrow $$HCO_3$$^- + H^+$$

Question 11

Which property of water allows it to absorb and release large amounts of heat with only a slight change in its own temperature?

Accepted Answer

High heat capacity

Question 12

Which of the following is a strong base?

Accepted Answer

Sodium hydroxide ($$\mathrm{NaOH})$$

Question 13

Which of the following best explains why water is called the 'universal solvent'?

Accepted Answer

It is polar and can dissolve many substances

Question 14

Which of the following is a correct example of a neutralization reaction?

Accepted Answer

$$HCl + NaOH \rightarrow H_2O + NaCl$$

Question 15

Which of the following is a stable isotope of carbon?

Accepted Answer

$$^{12}C$$

Question 16

Which of the following is NOT a pure substance?

Accepted Answer

Blood

Question 17

Which of the following best describes an exergonic reaction?

Accepted Answer

A reaction that releases energy spontaneously

Question 18

Which of the following ions is considered a complex ion?

Accepted Answer

Hydroxide ($$\mathrm{OH^-})$$

Question 19

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons

Question 20

Which of the following is the correct formula for the hydrolysis of ATP?

Accepted Answer

$$ATP ightarrow ADP + P_i + 	ext{energy}$$

The Chemical Context of Life: Foundations for Anatomy & Physiology

Guida di studio - Domande di pratica

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