Physical and Chemical Changes: Law of Conservation of Matter

Can matter be created or destroyed?

• Yes, it can be created.

• Yes, it can be destroyed.

• No, matter is always conserved

• None of these

Tags

NGSS.MS-PS1-5

The mass after a physical change, such as ice melting into water, stays the same

• True

• False

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-PS1-2

NGSS.MS-PS1-5

Suppose a reaction were to happen in an open container in a lab.  During the reaction, the scientist observes the chemicals bubble, and produce a gas.   During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g.  Explain what happened.  

• His chemical reaction defied the law of conservation of mass

• The product destroyed mass during the reaction

• The reactants created matter during the reaction

• The gas that was produced was not able to be weighed since the container was open.  

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

involves how a substance will interact with something else

• physical change

• chemical change

• chemical property

• physical property

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

when one or more substances combine to make something new

• chemical property

• chemical change

• physcial change

• mixture

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

a characteristic that you can observe directly or measure with a tool such as mass, size, shape, color, texture, and volume

• chemical property

• physical property

• chemical change

• physical change

What is the right part of a chemical equation called...

• Reactants

• Products

• Yields

• Output

Which of the following is an example of a physical change?

• Burning wood

• Rusting iron

• Melting ice

• Baking a cake

According to the Law of Conservation of Matter, what happens to the mass of substances in a closed system during a chemical reaction?

• It increases

• It decreases

• It remains the same

• It becomes zero

Tags

NGSS.MS-PS1-5