Balancing Chemical Equations

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃

• 4Fe + 3O₂ -> 2Fe₂O₃
• 2 Fe + 3O₂ -> Fe₂O₆
• 4 Fe + O₆ -> 2Fe₂O₃
• None of the options are correctly balanced.

Tags

NGSS.MS-PS1-5

Which of the following reactions is balanced?

• 2CH₄ + O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + 2H₂O
• None of the chemical equations are balanced.

Tags

NGSS.MS-PS1-5

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-5

Balance this equation.
_CF₄ + _Br₂ -- _CBr₄ + _F₂

• 2,1,2,1
• 1,2,2,1
• 1,2,1,2
• 2,2,2,2

Tags

NGSS.MS-PS1-5

Which coefficients balance this equation:
NH₃  +  O₂ ---->   NO  + H₂O

• 2,3,5,6
• 5,5,4,6
• 4,6,4,5
• 4,5,4,6

Tags

NGSS.MS-PS1-5

What is the unit of measurement for the amount of a substance

• Volume
• Mass
• Concentration
• Moles

What is true about the molar mass of chlorine gas?

• The molar mass is 35.45 g
• The molar mass is 70.90 g
• The molar mass is equal to 1 mole of chlorine atoms
• none of the above.

What is the volume of liquid in this graduated cylinder?

• 40.0 mL
• 40.3 mL
• 43.0 mL
• 44.0 mL

5,000 mg=____________grams

• 500 grams

• 50 grams

• 5 grams

• 5,000 grams

4,000 grams=_____________kg

• 40

• 400

• 4

• 4,000