Question 1

In the chemical formula H2O, how many hydrogen (H) and oxygen (O) atoms are present?

Accepted Answer

2 hydrogen atoms and 1 oxygen atom

Answer

3 hydrogen atoms and 1 oxygen atom

Answer

1 hydrogen atom and 2 oxygen atoms

Answer

2 hydrogen atoms and 2 oxygen atoms

Question 2

Given the chemical formula C6H12O6, how many carbon (C), hydrogen (H), and oxygen (O) atoms are present?

Accepted Answer

6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms

Answer

12 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms

Answer

6 carbon atoms, 6 hydrogen atoms, and 12 oxygen atoms

Answer

12 carbon atoms, 6 hydrogen atoms, and 6 oxygen atoms

Question 3

In the chemical formula NaCl, what is the count of sodium (Na) and chlorine (Cl) atoms?

Accepted Answer

1 sodium atom and 1 chlorine atom

Answer

1 sodium atom and 2 chlorine atoms

Answer

2 sodium atoms and 1 chlorine atom

Answer

2 sodium atoms and 2 chlorine atoms

Question 4

For the chemical formula CO2, how many carbon (C) and oxygen (O) atoms are present?

Accepted Answer

1 carbon atom and 2 oxygen atoms

Answer

2 carbon atoms and 2 oxygen atoms

Answer

2 carbon atoms and 1 oxygen atom

Answer

1 carbon atom and 1 oxygen atom

Question 5

In the chemical formula NH3, how many nitrogen (N) and hydrogen (H) atoms are present?

Accepted Answer

1 nitrogen atom and 3 hydrogen atoms

Answer

1 nitrogen atom and 1 hydrogen atom

Answer

3 nitrogen atoms and 1 hydrogen atom

Answer

3 nitrogen atoms and 3 hydrogen atoms

Question 6

In the chemical formula CaCO3, how many calcium (Ca), carbon (C), and oxygen (O) atoms are present?

Accepted Answer

1 calcium atom, 1 carbon atom, and 3 oxygen atoms

Answer

1 calcium atom, 1 carbon atom, and 2 oxygen atoms

Answer

2 calcium atoms, 1 carbon atom, and 3 oxygen atoms

Answer

1 calcium atom, 2 carbon atoms, and 2 oxygen atoms

Question 7

How many potassium (K), chlorine (Cl), and oxygen (O) atoms are in the compound KClO3?

Accepted Answer

1 potassium atom, 1 chlorine atom, and 3 oxygen atoms

Answer

2 potassium atoms, 2 chlorine atoms, and 3 oxygen atoms

Answer

1 potassium atom, 3 chlorine atoms, and 3 oxygen atoms

Answer

3 potassium atoms, 1 chlorine atom, and 1 oxygen atom

Question 8

What is the number of each type of atom in the chemical formula C2H5OH?

Accepted Answer

2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom

Answer

2 carbon atoms, 5 hydrogen atoms, and 1 oxygen atom

Answer

3 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom

Answer

1 carbon atom, 6 hydrogen atoms, and 2 oxygen atoms

Question 9

An element is...

Accepted Answer

made of only one type of atom

Answer

made of many atoms

Answer

made of molecules

Answer

made of two or more types of atoms

Question 10

A compound is...

Accepted Answer

made of two or more different elements

Answer

the same as a molecule

Answer

made of only one type of atom

Answer

a pure substance

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