Q: Which of the following is the correct formula for photosynthesis?

$$6CO_2 + 6H_2O \xrightarrow{\text{sunlight}} C_6H_{12}O_6$ + 6O_2$$

Question 1

Which of the following statements best explains why sodium chloride (NaCl) has properties different from those of its constituent elements, sodium and chlorine?

Accepted Answer

The formation of ionic bonds between sodium and chlorine creates emergent properties in NaCl.

Question 2

Which subatomic particle is primarily responsible for determining the chemical behavior of an atom?

Accepted Answer

Electron

Question 3

A neutral atom of carbon has an atomic number of 6 and a mass number of 12. How many neutrons does it contain?

Accepted Answer

6

Question 4

Which equation correctly represents the chemical reaction for the formation of water from its elements?

Accepted Answer

$$2H_2 + O_2$ \rightarrow 2H_2O$$

Question 5

Which of the following best describes a trace element?

Accepted Answer

An element required by an organism in minute quantities.

Question 6

If an atom has 11 protons, 12 neutrons, and 11 electrons, what is its atomic number and mass number?

Accepted Answer

Atomic number: 11, Mass number: 23

Question 7

Which of the following is true about valence electrons?

Accepted Answer

They are found in the outermost electron shell and determine chemical reactivity.

Question 8

What type of bond is formed when one atom donates an electron to another atom, resulting in oppositely charged ions?

Accepted Answer

Ionic bond

Question 9

Which of the following best describes a molecule?

Accepted Answer

A group of two or more atoms held together by covalent bonds.

Question 10

Which element makes up the largest percentage of body mass in humans, including water?

Accepted Answer

Oxygen

Question 11

A patient is diagnosed with an iodine deficiency. Which category does iodine fall under in terms of biological necessity?

Accepted Answer

Trace element

Question 12

Which of the following statements about chemical reactions is correct?

Accepted Answer

Chemical reactions involve the making and breaking of chemical bonds.

Question 13

Which of the following best explains why noble gases are chemically inert?

Accepted Answer

They have a full valence shell of electrons.

Question 14

Which of the following is the correct formula for photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O \xrightarrow{	ext{sunlight}} C_6H_{12}O_6$ + 6O_2$$

Question 15

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

Accepted Answer

A compound consists of two or more elements in a fixed ratio, while an element cannot be broken down by chemical reactions.

Question 16

Which of the following is true about the mass of electrons compared to protons and neutrons?

Accepted Answer

Electrons have much less mass and are often ignored when calculating atomic mass.

Question 17

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally, resulting in partial charges.

Question 18

If a sodium atom loses one electron, what is the resulting charge and name of the ion formed?

Accepted Answer

Positive charge; cation

Question 19

Which of the following is a correct statement about the relationship between atomic number and electron number in a neutral atom?

Accepted Answer

The atomic number equals the number of electrons in a neutral atom.

Question 20

Which of the following best explains why chemical reactions are often reversible?

Accepted Answer

Products of the forward reaction can become reactants in the reverse reaction.

The Chemical Context of Life: Foundations of Biological Chemistry

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