Chemical Reactions Introduction

Count the atoms from each element on the reactant and product sides of the chemical equation. Is this chemical equation balanced or unbalanced? (number 14)

• balanced

• unbalanced

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical reaction is also called a chemical change. (number 1)

• true

• false

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

During a chemical reaction, reactant atoms(mass) are _________ to the product atoms(mass). (number 8)

• equal

• different

• more

• less

Tags

NGSS.MS-PS1-5

What does a chemical equation represent? (number 6)

• matter classification

• chemical reactions

• isotopes

• neutral atoms

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Does the chemical equation represent an Endothermic or Exothermic reaction? (number 21)

• endothermic

• exothermic

Tags

NGSS.MS-PS1-4

______ are the are the number of molecules that appear before the chemical formulas. (number 13)

• Subscripts

• Mass numbers

• Coefficients

• Atomic numbers

Does the chemical equation represent an Endothermic or Exothermic reaction? (number 19)

• 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? (number 8)

• 10 grams

• 15 grams

• 0 grams

• 20 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The substances formed as a result of a chemical reaction are called ________. (number 3)

• reactants

• products

• subscript

• coefficient

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical equation must be balanced in order to show the mass is conserved during a reaction. (number 12)

• true

• false

Tags

NGSS.MS-PS1-5