Chemical Formulas, Equations, & Reactions Post Review

Chemical Formulas, Equations, & Reactions Post Review

Review and study the information on the review slides. Then answer the questions.

Multiple Choice

How many ELEMENTS are in the this chemical equation?

• 1

• 3

• 24

• 27

Multiple Choice

How many ATOMS of hydrogen (H) are in this chemical equation?

• 3

• 6

• 12

• 24

Multiple Choice

How many ELEMENTS are in this chemical equation?

• 3

• 4

• 9

• 10

Multiple Choice

How many TOTAL ATOMS are in this chemical equation?

• 3

• 6

• 12

• 24

Multiple Choice

How many TOTAL ATOMS are in this chemical equation?

• 3

• 4

• 9

• 17

• 21

Multiple Choice

Acetic acid is a compound found in vinegar. The chemical formula for acetic acid is CH₃COOH.

How many different ELEMENTS are in acetic acid?

• 3

• 5

• 6

• 8

Multiple Choice

The chemical formula for sodium sulfate is Na₂SO₄. How many sulfur atoms are in the formula for sodium sulfate?

• 1

• 2

• 6

• 7

Coefficients

The 5 coefficient means there are five H₂Os

H₂O + H₂O + H₂O + H₂O + H₂O

So all atoms in H₂O are muliplied by 5

Multiple Choice

How many TOTAL ATOMS are in the chemical formula 4O₂ ?

• 2

• 4

• 6

• 8

Multiple Choice

How many TOTAL ATOMS are in the chemical formula 2NH₃ ?

• 2

• 5

• 6

• 8

Multiple Choice

All ____________ are made up of two or more atoms bonded together.

• atoms

• molecules

• electrons

• elements

Multiple Choice

2H₂O

How many H₂O molecules are present?

• 1

• 4

• 2

• 8

Multiple Choice

The smallest unbreakable unit of a compound is called

• subscript
• proton
• formula
• molecule

The REACTANTS are the starting atoms. Basically the reactants mix together and REACT! The PRODUCTS are what you end up with after the chemical reaction occurs. The atoms rearrange to make something new. The something NEW are the PRODUCTS.

Use RAP to memorize which part of the chemical equation are the reactants and which part are the products

Multiple Choice

NaOH + HCl --> NaCl + H₂O Identify the reactants in the chemical equation above.

• NaOH and HCl

• NaCl and H₂O

• HCl and H₂O

• HCl and NaCl

Multiple Choice

2AgNO₃ + CaCl₂ --> 2AgCl + Ca(NO₃)₂

Identify the products in the chemical equation above.

• 2AgNO₃ and CaCl₂

• 2AgCl and Ca(NO₃)₂

• CaCl₂ and Ca

• Ag, Cl, N, and Ca

Multiple Choice

Cu + 2AgNO3  $\longrightarrow$ 2Ag + Cu(NO3)2
How many copper (Cu) atoms are there in 
Cu(NO3)2 ?

• 1

• 2

• 5

• 6

Multiple Choice

How many MOLECULES are on the PRODUCT side of the chemical equation NaOH + HCl --> NaCl + H₂O

• 1

• 2

• 4

• 5