$$\text{Mass Number} = \text{Number of Protons} + \text{Number of Neutrons}$$

Question 1

Which of the following best describes the difference between matter and energy?

Accepted Answer

Matter is anything that has mass and occupies space, while energy is the capacity to do work or put matter into motion.

Question 2

A patient is given a solution containing 180.12 grams of glucose dissolved in enough water to make 1 liter. What is the molarity of this solution?

Accepted Answer

$$1\ \mathrm{M}$$

Question 3

Which statement about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 4

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

Accepted Answer

Ionic bond

Question 5

A molecule of water ($$H_2O) is $$described as a dipole. What does this mean?

Accepted Answer

It has two regions of opposite charge due to unequal sharing of electrons.

Question 6

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

Accepted Answer

$$AB \rightarrow A + B$$

Question 7

Which statement best explains why noble gases are chemically inert?

Accepted Answer

Their valence shells are full, so they do not tend to gain, lose, or share electrons.

Question 8

Which of the following is true about mixtures and compounds?

Accepted Answer

Mixtures can be separated by physical means, while compounds require chemical reactions to separate.

Question 9

A solution contains 10 parts salt and 90 parts water. What is the percent concentration of salt in this solution?

Accepted Answer

$$10\%$$

Question 10

Which of the following best describes a suspension?

Accepted Answer

A heterogeneous mixture in which large, visible solutes settle out over time.

Question 11

Which of the following is a property of hydrogen bonds?

Accepted Answer

They are weak attractions between a slightly positive hydrogen and a slightly negative atom of another molecule.

Question 12

Which of the following is true regarding energy conversion in biological systems?

Accepted Answer

Energy conversion is inefficient, and some energy is lost as heat.

Question 13

Which of the following is the correct formula for calculating the mass number of an atom?

Accepted Answer

$$	ext{Mass Number} = 	ext{Number of Protons} + 	ext{Number of Neutrons}$$

Question 14

Which of the following is an example of an exchange (displacement) reaction?

Accepted Answer

$$AB + CD \rightarrow AD + CB$$

Question 15

Which factor does NOT increase the rate of a chemical reaction?

Accepted Answer

Decreasing the concentration of reactants

Question 16

Which of the following statements about radioisotopes is correct?

Accepted Answer

Radioisotopes can be used for diagnosis and treatment, but their radioactivity can also damage living tissue.

Question 17

Which of the following best describes a colloid?

Accepted Answer

A heterogeneous mixture in which solute particles do not settle out and the mixture appears cloudy or milky.

Question 18

Which of the following is true about the valence shell of an atom?

Accepted Answer

Electrons in the valence shell have the most potential energy and are involved in chemical reactions.

Question 19

In a redox reaction, which statement is correct?

Accepted Answer

Atoms are reduced when they gain electrons and oxidized when they lose electrons.

Chemistry Comes Alive: Basic Chemistry for Anatomy & Physiology 2A

Guida di studio - Domande di pratica