Parts of a Chemical Reaction

Which numbers are coefficients in this equation?

• 3 and 8

• 3, 8, 2, 2, 2

• 1, 5, 4, 3

• 5, 4, 3

Answer explanation

The coefficients are the large numbers in front of the molecule. It shows how many of this molecule are involved in the reaction.

Which numbers are subscripts in this equation?

• 3, 8, 2, 2, 1, 1, 2

• 3, 8, 2, 2, 2

• 1, 5, 4, 3

• 5, 4, 3

Answer explanation

The subscripts are the small numbers to the right of the element. It shows how many of this element are included in the molcule.

Which is/ are the reactant(s) in this equation?

• C₃H₈

• C₃H₈ and O₂

• H₂O and CO₂

• H₂O

Answer explanation

The reactants are the molecules on the left side of the reaction arrow.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is/ are the product(s) in this equation?

• C₃H₈

• C₃H₈ and O₂

• H₂O and CO₂

• H₂O

Answer explanation

The products are the molecules on the right side of the reaction arrow.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many oxygen atoms are there on the reactants side of the equation?

• 5

• 2

• 7

• 10

Answer explanation

the sbscript shows there are 2 oxygen atoms in each molecule and 5 molecules. 2 x 5 = 10 atoms

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

What elements are present here?

• 6 hydrogen, 6 oxygen and 3 carbon

• 8 hydrogen, 10 oxygen, and 3 carbon

• 8 hydrogen, 6 oxygen and 6 carbon

• 8 hydrogen, 3 oxygen and 3 carbon

Tags

NGSS.MS-PS1-5

Which is/ are the reactant(s) in this equation?

• C₃H₈

• C₃H₈ and O₂

• H₂O and CO₂

• H₂O

Answer explanation

The reactants are the molecules on the left side of the reaction arrow.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5