Chemical Reactions and Counting Atoms

Number of N in (NH₄)₂CrO₄

• 1

• 2

• 8

• 16

Tags

NGSS.MS-PS1-1

How many Hydrogen atoms in 3(NH₄)₂CrO₄?

• 4

• 2

• 8

• 24

Tags

NGSS.MS-PS1-1

How many elements are present in this compound? (Careful!)

Mg₂As₃COHNi₂

• 2

• 4

• 6

• 10

Tags

NGSS.MS-PS1-1

How many atoms of Oxygen are in Fe(NO₃)₃ ?

• 6

• 3

• 9

• 1

Tags

NGSS.MS-PS1-1

Which problem is balanced?

• PbO₂ + 2H₂--> H₂SO₄

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

• 2Na + 2H₂O --> 2NaOH + H

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Identify the reactants in the chemical equation below.

• NaCl and H₂O

• HCl and NaCl

• NaOH and HCl

• HCl and H₂O

Tags

NGSS.MS-PS1-1

Which of the following equations follows the law of conservation of mass?

• 2Na + Cl --> NaCl

• C₂H4 + 3O₂ --> 2CO₂ + 2H₂O

• C + 4H₂ --> CH₄

• 3H₂O --> 3H₂ +3O₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following chemical equations is balanced?

• 3Na + Cl₂ --> 3NaCl

• CO₂ + H₂O --> C₆H₁₂O₅ + O₂

• 2H₂O + O₂ --> 2H₂O + OH

• 3AgBr + GaPO₄ --> Ag₃PO₄ + GaBr₃

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many copper (Cu) atoms are there in the Cu(NO₃)₂ molecule below?

Cu + 2AgNO₃ ---> 2Ag + Cu(NO₃)₂

• 6

• 1

• 5

• 2

Tags

NGSS.MS-PS1-1

A student mixes two solutions (liquids), planning to produce carbon dioxide. Which of the following is the BEST evidence that a chemical reactions as taken place and carbon dioxide (gas) has been formed.

• Color Change

• Temperature Change

• Formation of bubbles

• formation of a solid

Tags

NGSS.MS-PS1-2