Conservation of Mass (Crash Course & BrainPOP)

What do you think happened to the water in the glass after being left out?

• It disappeared.

• It turned into gas and mixed with air.

• It changed into a solid.

• It stayed the same.

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NGSS.MS-PS1-4

What kind of change occurs when sugar dissolves in water?

• Chemical change

• Physical change

• Both chemical and physical change

• No change occurs

Which of the following is a clue that a chemical change has taken place?

• The substance dissolves

• The mixture turns transparent

• The production of gas bubbles

• The substance can be separated easily

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NGSS.MS-PS1-2

What is the difference between a physical change and a chemical change? Can both changes be reversed?

• Physical changes create new substances and are irreversible.
• Both physical and chemical changes are always reversible.
• Physical changes alter appearance without changing composition and are often reversible; chemical changes create new substances and are usually irreversible.
• Chemical changes alter appearance without changing composition and are often reversible.

In the sugar-water solution, what happens to the mass after the sugar dissolves?

• The mass of the solution is equal to the mass of the sugar and the water.

• The mass changes depending on the temperature of the solution.
• The mass increases after the sugar dissolves.
• The mass decreases after the sugar dissolves.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the conservation of mass?

• The conservation of mass is a fundamental principle stating that mass is neither created nor destroyed in chemical reactions.
• The conservation of mass applies only to gases.
• Mass is only conserved in physical changes.
• Mass can be created in chemical reactions.

Tags

NGSS.MS-PS1-5

What is a “Law” in science?

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

The mass of the reactants in a chemical reaction ______ ______ the mass of the products.

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NGSS.MS-PS1-5

What is mass?

• Mass is the amount of matter in an object.
• Mass is the force exerted by gravity.
• Mass is the speed of an object.
• Mass is a measure of temperature.

If you have 4 grams of hydrogen and 32 grams of oxygen, how many grams of the product (water) should you get?

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NGSS.MS-PS1-5