Modeling Chemical

All of the atoms present at the beginning of a chemical reaction are present at the end of a chemical equation.

• True

• False

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What is the substance that is formed after a chemical reaction called?

• product

• subscript

• coefficient

• reactants

Tags

NGSS.MS-PS1-5

What are the starting materials in a reaction?

• product

• subscript

• coefficient

• reactants

Tags

NGSS.MS-PS1-5

What happens to atoms in a chemical reaction?

• they are destroyed

• they are created

• they are rearranged

Tags

NGSS.MS-PS1-5

Does the image correctly represent the Law of Conservation of Mass?

• yes

• no

Tags

NGSS.MS-PS1-5

Does the image represent the Law of Conservation of mass?

• yes

• no

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Select the equations that follow the Law of Conservation of Mass meaning the equation is balanced.

PICK TWO

• H₂ + O₂ --> H₂O₂

• CO₂ --> Fe₂O₃

• Na Cl₂ --> 2NaCl

• Na₂ + 3H₂ --> 2NH₃

Tags

NGSS.MS-PS1-5

Why does this picture demonstrate the Law of Conservation of Mass?

• the number of atoms of each element are the same on both sides

• they start out separate and end up combined

• the same elements are used

• it doesn't demonstrate the Law of Conservation of Mass

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

In this model the reactant atoms differ in number from the product atoms.

• True

• False

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which of the following are PRODUCTS?
H₂O + CO₂ → HCO + HO

• H₂O and CO₂
• HCO and HO
• H₂O ONLY
• HCO ONLY

Tags

NGSS.MS-PS1-2