Law of Conservation of mass

Fill in the blank:
The law of conservation of mass states that matter cannot be created nor __________________.

• destroyed
• rearranged
• transferred
• changed

Tags

NGSS.MS-PS1-5

In a closed system, a chemical reaction takes place.  The mass of the reactants in the beginning of the reaction is 25g.  What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

• 25g
• You can't tell with the given information.
• 30g
• 15g

Tags

NGSS.MS-PS1-5

There are two reactants in a chemical equation, and one product.  The mass of the product is 30g.  The mass of the first reactant is 17g.  What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?

• 47g
• 13g
• 23g 
• You cant tell with the given information

Tags

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

The number in front of a compound or element is a 

• Subscript
• Coefficient
• Superscript
• Charge

What is law of conservation of mass ?

• Mass of reactants = mass of products

• mass of reactants > mass of the products

• mass of the reactants < mass of the products

• mass of reactants > 2 mass of the reactants

Tags

NGSS.MS-PS1-5

What is the left part of a chemical equation called?
H_{2 +} O → H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.MS-PS1-5

What is the right part of a chemical equation called?
H_{2 +} O → H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

What is the name of the scientist that is credited with the law of conservation of matter?

• Rutherford

• Lavoisier

• Captain Marvel

• Thomson

Tags

NGSS.MS-PS1-5

Which of the following is a reactant in the equation below:

2H₂O --> 2H₂ + O₂

• Hydrogen

• Oxygen

• Water

• Hydrogen, Oxygen, and Water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5