How many oxygen atoms are there in a molecule with the subscript 2 outside the brackets and 3 inside?

• 5

• 3

• 2

• 6

Tags

NGSS.MS-PS1-1

If a molecule has a subscript of 1 for nitrogen, how many nitrogen atoms are present?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

What does a coefficient of 2 in front of a molecule indicate?

• Two molecules

• Two atoms of each element in the molecule

• Two elements

• Two compounds

Tags

NGSS.MS-PS1-1

How many hydrogen atoms are there in 3 molecules of H2O?

• 3

• 6

• 9

• 12

Tags

NGSS.MS-PS1-1

In a chemical equation, where are the reactants located?

• In the middle

• Above the yield symbol

• On the left side

• On the right side

What does the law of conservation of mass state?

• Mass can be created or destroyed

• Mass of products must equal mass of reactants

• Mass can change during a reaction

• Mass is irrelevant in chemical reactions

Tags

NGSS.MS-PS1-5

When balancing chemical equations, what should you never change?

• Products

• Reactants

• Subscripts

• Coefficients

Tags

NGSS.HS-PS1-7

If you have 2 nitrogen atoms on the reactant side, how many should be on the product side?

• 4

• 3

• 2

• 1

Tags

NGSS.MS-PS1-5

What is the first step in balancing a chemical equation?

• Remove products

• Add more reactants

• Count the atoms of each element

• Change the subscripts

Why is balancing chemical equations often a trial-and-error process?

• Because subscripts can change

• Because products are always limited

• Because there is no single method

• Because reactants are always in excess

Tags

NGSS.HS-PS1-7