Law of Conservation of mass

How many Calcium atoms are in this compound? 
Ca (OH)₂

• 2
• 3
• 1
• 4

Tags

NGSS.MS-PS1-1

How many Sulfur atoms are in this compound? 
Al₂(SO₄)₃

• 4
• 2
• 3
• 1

Tags

NGSS.MS-PS1-1

Is this equation balanced or unbalanced? 
H₂ + O₂ --> H₂O

• balanced
• unbalanced

Tags

NGSS.MS-PS1-5

Is this equation balanced or unbalanced?
CH₄ + 2O₂--> CO₂+ 2H₂O

• balanced
• unbalanced

Tags

NGSS.MS-PS1-5

Is this equation balanced or unbalanced? 
2Fe₂O₃ + 3C --> 4Fe + 3 CO₂

• balanced
• unbalanced

Tags

NGSS.MS-PS1-5

12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? 

• 28 g
• 4g
• 30g
• 12g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the reaction shown by the equation, 252 grams of FeCl₂ and 70 grams of Cl₂ are consumed.
2FeCl₂+ Cl₂--> 2FeCl₃ 
How many grams of FeCl₃ are produced? 

• 161 grams
• 182 grams
• 322 grams
• 392 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which equation best represents the law of conservation of mass? 

• A
• B
• C
• D

Tags

NGSS.MS-PS1-5