Question 1

Which of the following best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.

Question 2

A scientist measures the mass of a sample as 2500 grams. What is the mass in kilograms?

Accepted Answer

$$2.5$$ kilograms

Question 3

Which of the following elements makes up the highest percentage of the human body by weight?

Accepted Answer

Oxygen

Question 4

A beaker contains 750 milliliters of water. How many liters is this?

Accepted Answer

$$0.75$$ liters

Question 5

Which laboratory instrument would you use to measure the temperature of a solution?

Accepted Answer

Thermometer

Question 6

A sample of water is measured at $$20^{\circ}C. $$What is this temperature in degrees Fahrenheit? (Use $$F = (C 	imes 9/5) + 32)$$

Accepted Answer

$$68^{\circ}F$$

Question 7

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

Accepted Answer

Water is polar and can dissolve many ionic and polar substances.

Question 8

A radioactive isotope is used as a tracer in medical imaging. Which property makes this possible?

Accepted Answer

Its emission of detectable radiation

Question 9

Which of the following is a trace element required to prevent goiter in humans?

Accepted Answer

Iodine

Question 10

A solution contains $$500$$ milliliters of liquid. How many fluid ounces is this? (1 fluid ounce = 29.57 milliliters)

Accepted Answer

$$16.9$$ fluid ounces

Question 11

Which of the following best describes a polar covalent bond?

Accepted Answer

Electrons are shared unequally, creating partial charges.

Question 12

Which of the following is the correct balanced equation for cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O$$

Question 13

A rock has a mass of $$140$$ grams. What is its mass in ounces? (1 ounce = 28.35 grams)

Accepted Answer

$$4.94$$ ounces

Question 14

Which of the following best explains why hydrogen bonds are important in biology?

Accepted Answer

They are weak bonds that help stabilize the structure of large molecules like DNA and proteins.

Question 15

Which of the following is NOT a correct pairing of metric unit and measurement?

Accepted Answer

Temperature - Kelvin ($$K)$$

Question 16

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have different numbers of neutrons.

Question 17

A scientist needs to measure the volume of an irregularly shaped solid. Which instrument should they use?

Accepted Answer

Graduated cylinder

Question 18

Which of the following best describes the role of trace elements in the human body?

Accepted Answer

They are required in small amounts for proper physiological function.

Question 19

Which of the following best explains why fluoride is added to municipal water supplies?

Accepted Answer

To help reduce tooth decay

The Chemistry of Life: Elements, Atoms, and Measurement in Biology

Guida di studio - Domande di pratica