Question 1

Which of the following best describes the difference between an element and a compound?

Accepted Answer

An element is a pure substance consisting of only one type of atom, while a compound is a substance formed from two or more different elements chemically bonded together.

Question 2

Given the reaction $$2\mathrm{Na}_{(s)} + \mathrm{Cl}_{2(g)} \rightarrow 2\mathrm{NaCl}_{(s)}$$, which statement is correct about the reactants and products?

Accepted Answer

Sodium metal and chlorine gas are reactants, and sodium chloride is the product.

Question 3

Which of the following is an example of potential energy in the human body?

Accepted Answer

ATP molecules storing energy in their chemical bonds.

Question 4

A scuba tank contains compressed air at 3,200 psi. If the tank is taken underwater, which property of matter allows the air to exert pressure?

Accepted Answer

Matter occupies space and has mass, so the air molecules collide with the tank walls, creating pressure.

Question 5

Which of the following best explains why energy conversions in the body are often inefficient?

Accepted Answer

Some energy is always lost as heat, which cannot be used to do work.

Question 6

Which of the following is a trace element in the human body, making up less than 0.01% of body weight?

Accepted Answer

Chromium (Cr)

Question 7

A neutral atom of sodium (Na) has an atomic number of 11 and a mass number of 23. How many neutrons does it have?

Accepted Answer

$$23 - 11 = 12$$ neutrons

Question 8

Which of the following best describes an isotope?

Accepted Answer

Atoms with the same number of protons and electrons but different numbers of neutrons.

Question 9

Which of the following is an example of a compound molecule?

Accepted Answer

$$\mathrm{H}_2\mathrm{O}$$

Question 10

Which form of energy is directly involved in moving matter, such as muscle contraction?

Accepted Answer

Mechanical energy

Question 11

If a radioactive isotope of carbon ($$^{14}\mathrm{C}) $$decays to $$^{12}\mathrm{C}$$ over time, what is released during this process?

Accepted Answer

Neutrons and energy in the form of radiation

Question 12

Which of the following best describes the difference between the planetary and orbital models of the atom?

Accepted Answer

The planetary model shows electrons in fixed orbits, while the orbital model shows regions where electrons are likely to be found.

Question 13

Which of the following is a correct statement about the states of matter?

Accepted Answer

Solids have a definite shape and volume, liquids have a definite volume but no definite shape, and gases have neither.

Question 14

Which of the following is an example of energy conversion in the human body?

Accepted Answer

Chemical energy in glucose is converted to mechanical energy during muscle contraction.

Question 15

Which of the following best explains why mass remains constant regardless of gravity or shape?

Accepted Answer

Mass is the amount of matter in an object and does not depend on external forces.

Question 16

A patient is exposed to X-rays during a medical procedure. Which form of energy is primarily involved?

Accepted Answer

Radiant (electromagnetic) energy

Question 17

Which of the following is true about the electrical charge of subatomic particles?

Accepted Answer

Protons and electrons have equal but opposite charges.

Question 18

Which of the following is a correct example of an elemental molecule?

Accepted Answer

$$\mathrm{O}_2$$

Question 19

A rock balanced on a cliff edge (as shown in one of the images) is an example of which type of energy?

Accepted Answer

Potential energy

Question 20

Which of the following best describes why sodium (Na) forms a positive ion ($$\mathrm{Na}^+) in $$chemical reactions?

Accepted Answer

Sodium loses an electron, resulting in a positively charged ion that is more stable.

Chemistry Comes Alive: Foundations for Anatomy & Physiology

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드