Chemical Reactions and Balancing Equations

What is law of conservation of mass ?

• Mass of reactants = mass of products

• mass of reactants > mass of the products

• mass of the reactants < mass of the products

• mass of reactants > 2 mass of the reactants

Tags

NGSS.MS-PS1-5

Consider the chemical equation CH₄ + 2 O₂ → CO₂ + 2 H₂O. In this equation, CH₄ is a

• product

• reactant

• displacement

Tags

NGSS.MS-PS1-2

What is the left part of a chemical equation called?
H_{2 +} O → H₂O

• Reactants

• Products 

• Yields 

• Chemical Equation 

What is the right part of a chemical equation called?
H_{2 +} O → H₂O

• Reactants

• Products 

• Yields 

• Chemical Equation 

In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.

• reactants

• products

• neutrals

• energizers

Tags

NGSS.MS-PS1-2

The reactants are on the left side of the chemical equation.

• True

• False

Tags

NGSS.MS-PS1-5

Does this follow the law of conservation of mass:

• Yes

• No

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Does this follow the law of conservation of mass:

Yes No

O_{3 --->} O + O₂

• Yes

• No

Tags

NGSS.MS-PS1-5

Does this follow the law of conservation of mass:

Yes No

Na + F --> NaF

• Yes

• No

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction

• Mass is created in a physical change

• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants

• Mass is never created or destroyed

Tags

NGSS.MS-PS1-5