Law of Conservation

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction
• Mass is created in a physical change
• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
• Mass is never created or destroyed

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 

• 4g
• 5g
• 9g
• 14g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Matter can not be created nor destroyed: it can only be

• Destroyed a little bit
• Invisible
• Transformed, changed
• None of the above

Tags

NGSS.MS-PS1-5

If a reaction starts with a total 75g of reactants it should produce 

• a total of 40g of products
• a total of 75g of products
• a total of 180 g of products
• None of the above

Tags

NGSS.MS-PS1-5

In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?

• 17g
• 2g
• 7g
• None of the above

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-PS1-5

24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride

• 62 
• 38
• 24
• 14

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sodium and chlorine combine to form sodium chloride, or table salt. Sodium and chlorine are:

• Producers

• Products

• Reactionaries

• Reactants

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

4 grams of hydrogen and 32 grams of oxygen will combine to form:

• 36 grams of water

• 28 grams of hydroxide

• 32 grams of oxygen

• 36 grams of deuterium

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?

• 4 grams

• 6 grams

• 8 grams

• 10 grams

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5