Law of Conservation of Mass

A student mixes 125 grams of sugar, 250 grams of water and 5 grams of flavoring. The solution weighs...

• 250 grams

• 380 grams

• 375 grams

• 400 grams

A precipitate is a 

• liquid that forms when two solids are reacted
• a solid that forms when two liquids are mixed
• a gas that forms when vinegar and baking soda react
• a change of color in a solution

Tags

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-PS1-2

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

What do we call the chemicals that result from a chemical reaction?

• reactants

• products

• subscripts

• coefficients

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

________ are the starting substances in a chemical equation.

• Reactants

• Producer

• Reaction

• Products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The law of conservation of mass states that ________

• the total mass of reactants is more than the total mass of products

• the mass of a chemical reaction is not constant

• the mass of a chemical reaction remains constant

• the total mass of reactants is less than the total mass of products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The Law of Conservation of Mass States

• Energy cannot be created nor destroyed, it can only change form.

• Mass cannot be created nor destroyed, it can only change form.

• Mass can be created or destroyed, it cannot change form.

Tags

NGSS.MS-PS1-5

The number to the lower side of an element is a 

• Subscript
• Superscript
• Coefficient
• Charge

Tags

NGSS.MS-PS1-1

The number in front of a compound or element is a 

• Subscript
• Coefficient
• Superscript
• Charge