09. Balancing Equations

The red numbers in the image below represent ________

• subscripts

• coefficients

• oxidation numbers

• None of the answers are correct

The blue numbers in the image below represent ________

• oxidation numbers

• coefficients

• subscripts

• none of the answers are correct

The original substances before a chemical reaction are called the ____

• product

• yield

• chemical symbol

• reactants

Tags

NGSS.MS-PS1-1

In the equation, 2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O₂

• MgO

• Mg and MgO

• O₂ and MgO

Tags

NGSS.MS-PS1-2

In a chemical reaction, the new substances formed are called ______________.

• Products

• Yields

• Molecules

• Reactants

Tags

NGSS.MS-PS1-2

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

• 2
• 6
• 1
• 4

Tags

NGSS.HS-PS1-7

What type of reaction is the following equation?

Fe + S --> FeS

• combination

• decomposition

• single replacement

• double replacement

How many O's are in Al₂(SO₄)₃

• 4
• 12
• 7
• 24

Tags

NGSS.MS-PS1-1

How many total H atoms are in 3 (NH₄)₂CrO₄

• 4

• 2

• 8

• 24

Which is the meaning of the Law of Conservation of Mass ?

• Matter cannot be gained or lost in a chemical reaction.

• Matter can only be lost in a chemical reaction.

• Matter can only be gained in a chemical reaction.

• Matter can be gained and lost in a chemical reaction.

Tags

NGSS.MS-PS1-5