Chemical Reactions

This is two or more atoms that are chemically joined.

• Compound

• Mixture

• Molecule

• Element

Tags

NGSS.MS-PS1-1

Of the following, what happens during a chemical change?

• Bonds break between atoms.

• New bonds form between rearranged atoms.

• Atoms change their arrangement.

• All of the above.

Tags

NGSS.MS-PS1-5

Which of the following would BEST help a scientist identify an Unknown Substance?

• It is white.

• It has a melting point point of 459 degrees Celsius.

• It has a volume of 51 milliliters.

• It has a mass of 7.3 grams.

Tags

NGSS.MS-PS3-4

Which of the following would produce a new substance?

• Dissolving salt in water

• Cooling water until it freezes into ice

• Mixing pretzels, peanuts, and mm's

• Burning a piece of magnesium ribbon

Tags

NGSS.MS-PS1-2

The arrow in a molecular equation means...

• To stop

• To go

• To change to

• To slow down

How many total atoms are present in the following: 3NaOH?

• 3

• 9

• 12

• 4

Tags

NGSS.MS-PS1-1

This is a starting substance in a chemical reaction.

• product

• molecular equation

• new substance

• reactant

Two or more different atoms chemically joined is known as a(n)...

• Element

• Atom

• Mixture

• Compound

Tags

NGSS.MS-PS1-1

A molecular equation shows evidence of a chemical change. What would you do to prove that a chemical change occurred?

• Test the properties of the reactants.

• Test the properties of the products.

• Compare the properties of the reactants and products.

• Sit back and enjoy a nap.

Tags

NGSS.MS-PS1-2

This is the smallest particle of matter and represented with a symbol.

• atom

• element

• compound

• molecule

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5