Q: A sample contains 2 moles of water ($$H_2O). $$How many molecules of water are present in the sample?

$$1.204 \times 10$$^{24}$$ molecules

Question 1

Which type of variable can be manipulated by the researcher and is thought to directly affect the other variable in an experiment?

Accepted Answer

Independent; dependent

Question 2

A ___ is an assumption made before any research has been done, whereas a ___ is a tested, well-substantiated, unifying explanation for a set of verified and proven factors.

Accepted Answer

Hypothesis; theory

Question 3

For a hydrogen atom to form a hydrogen bond, the interacting atom must have which of the following characteristics?

Accepted Answer

High electronegativity

Question 4

Considering an ionic bond formation between a metal atom (M) possessing a solitary valence electron and a nonmetal atom (N) possessing seven valence electrons, which of the following statements accurately describes the electron transfer process?

Accepted Answer

N gains a single electron from M.

Question 5

The smallest particle of a pure substance that may or may not exist independently is termed:

Accepted Answer

An atom

Question 6

What is the number of neutrons in an isotope of carbon with an atomic mass of 14 and an atomic number of 6?

Accepted Answer

8

Question 7

The Hydrogen ion concentration of a particular lake is $$10^{-5} M. $$The pH of the lake should be:

Accepted Answer

5

Question 8

Why does the same amount of heat raise the temperature of 1 g of iron more than 1 g of water?

Accepted Answer

Iron has a lower specific heat than water

Question 9

Which of the following best describes a controlled variable in a scientific experiment?

Accepted Answer

A variable that is kept constant to prevent it from influencing the outcome

Question 10

Which of the following is a real-world example of a hydrogen bond?

Accepted Answer

The bond between water molecules in liquid water

Question 11

If the atomic number of oxygen is 8, how many electrons does a neutral oxygen atom have?

Accepted Answer

8

Question 12

Which of the following statements about ionic bonds is correct?

Accepted Answer

Ionic bonds result from the transfer of electrons from one atom to another.

Question 13

A solution has a pH of 3. What is the hydrogen ion concentration $$[H^+] in $$the solution?

Accepted Answer

$$1 	imes 10$$^{-3}$$ M

Question 14

Which property of water allows it to dissolve many ionic compounds?

Accepted Answer

High polarity

Question 15

Which of the following best explains why sodium (Na) reacts vigorously with chlorine (Cl) to form table salt?

Accepted Answer

Sodium donates an electron to chlorine, forming an ionic bond

Question 16

Which of the following is NOT a characteristic of a scientific theory?

Accepted Answer

It is a guess made before any research

Question 17

A sample contains 2 moles of water ($$H_2O). $$How many molecules of water are present in the sample?

Accepted Answer

$$1.204 	imes 10$$^{24}$$ molecules

Question 18

Which of the following best describes the process of hypothesis testing in scientific research?

Accepted Answer

Designing experiments to collect data that support or refute the hypothesis

Question 19

Which of the following is true about the specific heat capacity ($$c) of $$water compared to iron?

Accepted Answer

Water has a higher specific heat capacity than iron

Question 20

Which of the following equations correctly relates pH and hydrogen ion concentration?

Accepted Answer

$$pH = -\log_{10}[H^+]$$

Fundamental Concepts in Physical Science: Atoms, Bonds, and Properties of Matter

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