Law of Conservation of Matter

Balance this equation
_N₂ + _H₂ --> _NH₃

• 1,2,3
• 1,3,2
• 1,1,2
• 2,1,1

Tags

NGSS.MS-PS1-5

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2
• 6
• 1
• 4

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

The coefficient in  3H₂O is

• 6
• 2
• 3
• 5

Tags

NGSS.MS-PS1-1

Which of the following are Subscripts in this Chemical Formula: 3Fe₂O₄

• 3,4

• 3,2

• 2,4

• 6

Tags

NGSS.MS-PS1-1

Which section represents the reactants?

• A

• B

• C

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

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

If a chemical reaction occurs in a closed system (no way for any part of the reaction to escape), how does the product mass compare to the reactant mass?

• the mass would decrease

• the mass would increase

• the mass would stay the same

• it depends on the type of reaction

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

If a chemical reaction occurs in an open system (not contained), what might happen to the measurable mass of the products when compared to the reactants?

• the measurable mass might decrease because any gas produced can escape (the actual mass would stay the same)

• the mass would increase because mass was created

• the measurable mass would stay the same because nothing would be able to leave the system.

• it depends on the type of reaction

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which picture below would correctly demonstrate the Law of Conservation of Matter if this picture is the reactants?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which of the following chemical equations are balanced? (check all that apply)

• 2Mg + O₂ --> 2MgO

• 2Al₂O₃ --> 4Al + 3O₂

• HgO --> 2Hg + O₂

• Na + Br₂ --> 2NaBr

• C + 2H₂ --> CH₄

Tags

NGSS.MS-PS1-5