Law of Conservation of Mass - Post Lab

The number in front of a compound or element is a 

• Subscript
• Coefficient
• Superscript
• Charge

The Coefficient (3) in the Chemical Formula, 3H₂O, tells you how many _____________ there are.

• Atoms of Hydrogen

• Atoms of Oxygen

• Atoms of Water

• Molecules of Water

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

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

• 62 
• 38
• 24
• 14

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

32 g of Oxygen completely reacts with 8 g of Hydrogen to produce _____ g Water

• 8

• 12

• 24

• 40

Tags

NGSS.MS-PS1-5

What does the Law of Conservation of Mass state?

• Mass is created at the end of a chemical reaction

• Mass can not be created or destoryed 

• Mass is created in a physical change 

• New chemicals are formed when a chemical reaction takes place.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?

• They both will weigh the same
• The product always weighs more than the reactant
• The reactant will weigh more than the product
• They both will loose mass after the reaction

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What types of systems are there?

• Mechanical and Electrical Systems
• Inside and Outside Systems
• Open and Closed Systems
• Human and Machine Systems

This type of system allows matter to flow freely in and out...

• Closed System
• Open System

Tags

NGSS.MS-ESS2-4

A boiling pot with a lid on it to keep in the energy is what type of system?

• Closed System
• Open System

Tags

NGSS.MS-PS3-4