$$\text{Number of neutrons} = \text{Atomic mass} - \text{Atomic number}$$

Question 1

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

Accepted Answer

A molecule is made of atoms of the same element, while a compound molecule is made of atoms of different elements.

Question 2

In a chemical reaction, which of the following correctly identifies the parts involved?

Accepted Answer

Reactant $$\rightarrow$$ Product

Question 3

Given an element with atomic number 2, what can you determine about it?

Accepted Answer

It has 2 protons in its nucleus.

Question 4

If an element has an atomic mass of 9 and an atomic number of 4, how many neutrons does it have?

Accepted Answer

$$9 - 4 = 5$$ neutrons

Question 5

Which subatomic particles are found in the nucleus of a lithium atom?

Accepted Answer

Protons and neutrons

Question 6

What is an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 7

Which of the following is a property of water that is crucial for life?

Accepted Answer

Water has a high surface tension due to cohesion and adhesion.

Question 8

A solution has a pH of 5.5. Which statement is correct?

Accepted Answer

The solution is acidic.

Question 9

Which formula correctly represents the relationship between atomic mass, atomic number, and number of neutrons?

Accepted Answer

$$	ext{Number of neutrons} = 	ext{Atomic mass} - 	ext{Atomic number}$$

Question 10

Which of the following molecules is polar?

Accepted Answer

Water ($$H_2O)$$

Question 11

What does 'polar' mean in the context of molecules?

Accepted Answer

Unequal balance of charge in a molecule

Question 12

Which of the following is the correct order of bond strength from strongest to weakest?

Accepted Answer

Covalent \u003e Ionic \u003e Hydrogen

Question 13

Which of the following is NOT a biological molecule?

Accepted Answer

Salt

Question 14

A hydrogen bond is best described as:

Accepted Answer

An attraction between a hydrogen atom and an electronegative atom like oxygen or nitrogen

Question 15

Which property of water allows ice to float?

Accepted Answer

Ice is less dense than liquid water due to hydrogen bonding.

Question 16

If a solution has a high concentration of $$OH^-$$ ions, what is its pH likely to be?

Accepted Answer

Greater than 7

Question 17

Which of the following is a universal solvent?

Accepted Answer

Water

Question 18

Which of the following best explains why sodium chloride ($$NaCl) $$dissolves in water?

Accepted Answer

Water's polarity allows it to surround and separate $$Na^+$$ and $$Cl^-$$ ions.

Question 19

Which biological molecule is primarily responsible for storing genetic information?

Accepted Answer

Nucleic acids

Question 20

A patient has a blood pH of 7.2. Which of the following best describes their condition?

Accepted Answer

Slightly basic

Fundamental Concepts in General Biology: Atoms, Molecules, Chemical Bonds, and Biological Molecules

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