Law of Conservation

In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?

• 4 grams

• 6 grams

• 8 grams

• 10 grams

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

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-PS1-2

NGSS.MS-PS1-5

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams should reactant B have? 

• 4g

• 5g

• 9g

• 14g

Tags

NGSS.MS-PS1-5

How many grams of OXYGEN would be needed to show conservation of mass in the example below?

• 100 g

• 93 g

• 7 g

• 0 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many grams of coal were present at the start of the chemical change?

• Unknown

• 100 g

• 200 g

• 50 g

Tags

NGSS.MS-PS1-5

How many grams of CHOCOLATE POWDER are shown in the example of conservation of mass below?

• 450 g

• 465 g

• 0 g

• 15 g

Tags

NGSS.MS-PS1-5

How many kilograms of SMOKE are shown in the example of conservation of mass?

• 1 kg

• 30 kg

• 28 kg

• 3 kg

Tags

NGSS.MS-PS1-2

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-PS1-2

NGSS.MS-PS1-5

Which of the following best describes the Law of Conservation of Mass?

• Mass is created during a chemical reaction.

• Mass is destroyed during a chemical reaction.

• Mass is neither created nor destroyed during a chemical reaction.

• Mass is always increased during a chemical reaction.

Tags

NGSS.MS-PS1-5

In a closed system, if 10g of reactant A reacts with 15g of reactant B, what will be the total mass of the products?

• 10g

• 15g

• 25g

• 30g

Tags

NGSS.MS-PS1-5