Chemical Reactions

Which observation(s) might be used as evidence that a chemical reaction occurred?

• Color change
• Odor change
• Properties change
• All of the above

Tags

NGSS.MS-PS1-2

_________ is (are) made of more than one atom.

• A molecule
• Protons
• Neutrons
• An element

Tags

NGSS.MS-PS1-1

________ result(s) in no new substances.

• A physical change
• A chemical change
• Physical and chemical changes
• None of the above

Tags

NGSS.MS-PS1-2

Which is an example of a physical change?

• Burning wood
• Freezing water
• Rust on a car
• Cooking food

Tags

NGSS.MS-PS1-4

Which is an example of a chemical change?

• Burning wood
• Rust on a car
• Cooking food
• All of the above

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If you start a chemical reaction with 5 atoms of helium, how many atoms will you have after?

• 4 atoms
• 10 atoms
• 1 atom
• 5 atoms

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following help a chemical reaction to happen faster?

• Molecule
• Atom
• Catalyst
• Density

Tags

NGSS.HS-PS1-5

Is TNT exploding a physical or chemical change?

• Physical
• Chemical
• Both physical and chemical
• Neither physical nor chemical

Tags

NGSS.MS-PS1-2

Which of these is NOT a sign that a chemical change has occurred? 

• A loss of transparency 
• An unexpected color change
• A temperature change
• The formation of a precipitate

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?

• Reactants
• Products
• Atoms
• Catalysts

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5