Conservation of Mass

What is a reactant in a chemical equation?

• The input which reacts chemically to create product
• the output, or result of a chemical reaction
• a small molecule that makes up one part of a polymer
• compounds made of thousands of repeating smaller molecules

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a product in a chemical reaction?

• the output, or result of a chemical reaction
• occurs when the atoms and molecules of two or more substances rearrange to form new substances
• a small molecule that makes up one part of a polymer
• The input which reacts chemically to create product

Tags

NGSS.MS-PS1-2

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-PS1-2

NGSS.MS-PS1-5

The following chemical reaction occurs:
2S + 3O₂ -> 2SO_{3
How many atoms of oxygen are there in the reactant?}

• 2 atoms of oxygen
• 3 atoms of oxygen
• 6 atoms of oxygen
• 1 atom of oxygen

Tags

NGSS.MS-PS1-1

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

Measure of the amount of matter 

• mass
• volume
• weight
• density

Smallest unit of an element

• compound
• atom
• molecule
• product

Smallest unit of a compound

• atom
• density
• element
• molecule

Tags

NGSS.MS-PS1-1

Substance that cannot be broken into simpler substances

• element
• molecule
• gram
• proton

Tags

NGSS.HS-PS1-1