Exploring the conservation of mass

What happens to matter when it seems to disappear?

• It changes form

• It becomes invisible

• It is destroyed

• It transforms into energy

Tags

NGSS.MS-PS1-5

What is a physical change?

• Change in physical properties without altering chemical structure

• None of the above

• Change in chemical structure

• Irreversible change

What indicates a chemical change?

• Change in temperature

• All of the above

• Production of gas

• Change in color

Tags

NGSS.MS-PS1-2

Why is mass conserved in chemical reactions?

• Due to energy loss

• Because matter is neither created nor destroyed

• All reactants are used up

• Because new substances are lighter

Tags

NGSS.MS-PS1-5

What is a reactant in a chemical reaction?

• A product formed

• A substance that remains unchanged

• A catalyst

• A substance that undergoes change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does the conservation of mass state?

• Mass can be created and destroyed

• Mass is only conserved in physical changes

• Mass cannot be created or destroyed

• Mass is only conserved in chemical reactions

Tags

NGSS.MS-PS1-5

What would you observe if you could collect all the water molecules that evaporated from the glass?

• They would weigh less than before

• They would weigh more than before

• Their weight would be the same as initially

• They would be weightless

Tags

NGSS.MS-PS1-5

In the experiment mixing sugar and water, what was the total mass of the solution?

• 5 grams

• 10 grams

• 15 grams

• 20 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What can be concluded from the sugar and water experiment?

• Mass remains unchanged in physical changes

• Mass increases in solutions

• Mass is lost when substances dissolve

• Dissolving is a chemical change

What future topic is hinted at the end of the video?

• Advanced chemical reactions

• More on chemical changes

• Biological implications of mass conservation

• Further physical changes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5