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

Question 1

Which of the following statements best describes an isotope of carbon?

Accepted Answer

An atom of carbon with the same number of protons but a different number of neutrons.

Question 2

Given the atomic number of oxygen is 8 and its atomic mass is 16, how many neutrons does a neutral oxygen atom have?

Accepted Answer

$$8$$

Question 3

Which type of bond is responsible for holding water molecules together, allowing for cohesion and high specific heat capacity?

Accepted Answer

Hydrogen bond

Question 4

A sodium ion ($$\mathrm{Na^+}) $$has 11 protons. How many electrons does it have?

Accepted Answer

$$10$$

Question 5

Which property of water allows it to climb up the inside of a plant stem against gravity?

Accepted Answer

Adhesion

Question 6

What is the electron configuration for a stable atom with 10 electrons?

Accepted Answer

2 electrons in the first energy level, 8 electrons in the second energy level

Question 7

Which of the following best explains why water is an excellent solvent?

Accepted Answer

Water is highly polar, allowing it to dissolve many ionic and polar substances.

Question 8

Which of the following chemical equations correctly represents the process of cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}$$

Question 9

Which of the following is true about ions?

Accepted Answer

Ions are formed when the number of electrons in an atom changes.

Question 10

A solution has a pH of 3.0. Which of the following best describes this solution?

Accepted Answer

It is acidic and has more $$H^+$$ ions than $$OH^-$$ ions.

Question 11

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between atoms.

Question 12

Which of the following elements makes up the largest percentage of the mass of a human being?

Accepted Answer

Oxygen

Question 13

What is the main reason why water has a high specific heat capacity?

Accepted Answer

Water molecules form strong hydrogen bonds.

Question 14

Which of the following is a correct statement about the atomic number of an element?

Accepted Answer

It is equal to the number of protons in the nucleus.

Question 15

Which of the following best explains why water forms a meniscus in a graduated cylinder?

Accepted Answer

Water molecules are attracted to the glass due to adhesion.

Question 16

Which of the following is a polar covalent molecule?

Accepted Answer

Water ($$H_2O)$$

Question 17

If an atom has 16 electrons, how are they distributed among the first three energy levels?

Accepted Answer

2 in the first, 8 in the second, 6 in the third

Question 18

Which of the following is true about the formation of ionic bonds?

Accepted Answer

They are formed when atoms of opposite charge attract each other.

Question 19

Which of the following best describes the role of hydrogen bonds in biological molecules?

Accepted Answer

They help hold large molecules, such as proteins, together.

Question 20

Which of the following is true about the pH of pure water?

Accepted Answer

It has a pH of 7, with equal amounts of $$H^+$$ and $$OH^-$$ ions.

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