Chemical Reactions Introduction

Count the atoms on the reactant and product sides of the chemical equation. Is this chemical equation balanced (equal amount of atoms) or unbalanced (unequal amount of atoms)?

• balanced

• unbalanced

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A chemical reaction is also called a chemical change.

• true

• false

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

During a chemical reaction, reactant atoms(mass) are _________ to the product atoms(mass).

• equal

• different

• more

• less

Tags

NGSS.MS-PS1-5

What does a chemical equation represent?

• matter classification

• chemical reactions

• isotopes

• neutral atoms

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

NGSS.MS-PS1-1

Does the chemical equation represent an Endothermic or Exothermic reaction?

• endothermic

• exothermic

Tags

NGSS.MS-PS1-4

______ are the are the number of molecules that appear before the chemical formulas.

• Subscripts

• Mass numbers

• Coefficients

• Atomic numbers

Does the chemical equation represent an Endothermic or Exothermic reaction?

• endothermic

• exothermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

If you start with 20 grams of hydrogen on the reactant side, how many grams of hydrogen should you end with on the product side?

• 10 grams

• 15 grams

• 0 grams

• 20 grams

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The substances formed as a result of a chemical reaction are called ________.

• reactants

• products

• subscript

• coefficient

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A chemical equation must be balanced in order to show the mass is conserved during a reaction.

• true

• false

Tags

NGSS.MS-PS1-5