Law of Conservation of Mass Balancing Equations

A chemical reaction is balanced when

• both sides have the same elements

• Both sides have the same  number of atoms

• Same subscripts

• Same coefficients

Tags

NGSS.MS-PS1-5

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products

• a total of 10g of products

• a total of 80 g of products

• a total of 20g of products

Tags

NGSS.MS-PS1-5

Which of the following models best demonstrates a balanced chemical equation?

• F

• G

• H

• J

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 

• Subscript

• Atom

• Equation

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants

• Products 

• Yields 

• Chemical Equation 

The law of conservation of mass states that ________

• the total mass of reactants is more than the total mass of products

• the mass of a chemical reaction is not constant

• the mass of a chemical reaction remains constant

• the total mass of reactants is less than the total mass of products

Tags

NGSS.MS-PS1-5

According to the law of conservation of mass, how much mercury was present in the mercury (II) oxide?

• 55.8 g

• 64.2 g

• 60.0 g

• 126.0 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which chemical equation supports the law of conservation of mass?

• Equation (a)

• Equation (b)

• Equation (c)

• Equation (d)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is the Law of Conservation of Matter?

• matter cannot be created or destroyed, it only changes form

• matter can be created but it cannot be destroyed, it never changes form

• matter can be destroyed but it cannot be created, it usually just changes form

• matter is an unproven theory created by Hans Geiger

Tags

NGSS.MS-PS1-5

________ are the starting substances in a chemical equation.

• Reactants

• Producer

• Reaction

• Products