Post Lab: Conservation of Mass "Does Gas Have Mass?"

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

NGSS.MS-PS1-2

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

Students react baking soda & vinegar.
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?

• The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
• Bubbles were produced during the reaction, which meant that a gas was being produced.
• The plastic bag did not change in any way, indicating that it was not involved in the reaction.
• The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

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-PS1-5

NGSS.MS-PS1-2

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

NGSS.MS-PS1-2

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

How many IRON atoms are in this chemical formula?

• 4 iron atoms

• 2 iron atoms

• 8 iron atoms

• 3 iron atoms

Tags

NGSS.MS-PS1-1

What will happen to the mass of the product if I double the mass of the reactants?

• It will decrease by half.
• It will increase by half.
• It will double in amount.
• The mass remains the same.

Tags

NGSS.MS-PS1-5

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