Counting Atoms in Chemical Formulas

The video tutorial explains how to represent different quantities of molecules using coefficients in chemical formulas. It provides examples with water and table sugar, demonstrating how to calculate the total number of atoms by multiplying the coefficient with the subscripts of each element in the formula.

What is the purpose of using a coefficient in molecular formulas?

• To indicate the physical state of the molecule

• To represent different amounts of molecules

• To change the chemical properties of the molecule

• To identify the type of molecular bonds

What does the coefficient in a molecular formula indicate?

• Type of chemical reaction

• Speed of the reaction

• Phase change of the substance

• Number of molecules

How many hydrogen atoms are in five molecules of water?

• 5

• 10

• 20

• 15

Tags

NGSS.MS-PS1-1

How many oxygen atoms are present in five molecules of water?

• 5

• 20

• 10

• 15

Tags

NGSS.MS-PS1-1

What is the total number of atoms in five molecules of water?

• 20

• 15

• 25

• 10

Tags

NGSS.MS-PS1-1

How many carbon atoms are there in four molecules of table sugar?

• 96

• 48

• 24

• 12

Tags

NGSS.MS-PS1-1

Calculate the total number of hydrogen atoms in four molecules of table sugar.

• 88

• 22

• 176

• 44

Tags

NGSS.MS-PS1-1

How many oxygen atoms are in four molecules of table sugar?

• 88

• 44

• 22

• 11

Tags

NGSS.MS-PS1-1

What is the total number of atoms in four molecules of table sugar?

• 210

• 200

• 190

• 180

Tags

NGSS.MS-PS1-1