Sps3a

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

Fill in the blank:
A __________________ chemical equation shows that the same number of atoms in the reactants are also in the product.

• balanced
• transferred
• rearranged
• beautiful

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

In a chemical reaction, the mass of the reactants was 15g.  The mass of the products was 12g.  Did this chemical reaction follow the law of conservation of mass?

• Yes 
• No
• You can't tell with the given infomation 

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

NGSS.MS-PS1-5

The following chemical reaction occurs:
N₂ + 3 H_{2 ->} 2 NH₃
How many atoms of hydrogen are there in the product?

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

Tags

NGSS.MS-PS1-1

The following chemical equation occurs:
CH₄ + 2O₂ -> CO₂ + 2H₂O
Does this equation follow the law of conservation of mass?  In other words, are there the same number of carbon, hydrogen, and oxygen atoms in the reactants and the products?

• Yes
• No
• You can't tell with the given information 

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

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products
• a total of 10g of products
• a total of 80 g of products
• a total of 20g of products

Tags

NGSS.MS-PS1-5

Which are the reactants in the following reaction?
2Mg + O₂ ---> 2MgO 

• Mg and O
• MgO
• Mg and MgO
• O and MgO

Tags

NGSS.MS-PS1-1