Chemical Reactions

Which elements are in this formula?

(click all that apply)

• Nitrogen (N)

• Sodium (Na)

• Oxygen (O)

• Hydrogen (H)

Answer explanation

Every element found on the periodic table has a 1 or 2 letter abbreviation to help scientists communicate quickly and write chemical formulas.

Tags

NGSS.MS-PS1-1

Which is an example of a chemical change?

(click all that apply)

• Burning wood

• Rust on a car

• Cooking food

• Frozen Water

Answer explanation

A Chemical Change will create a new product. Frozen water is WATER in a different form.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Production of Gas or Bubbles is evidence of a

• Physical Change

• Chemical Change

Answer explanation

Gas or bubbles are products of a chemical reaction because they happen after reactants are combined.

Tags

NGSS.MS-PS1-2

A mixture is made of at least how many different types of atoms/molecules?

• 2

• 1

• 4

• 7

Answer explanation

2 or more substances combined together are considered a mixture.

Tags

NGSS.MS-PS1-1

______ is anything that has volume and mass

• Density

• Volume

• Mass

• Matter

Answer explanation

Matter takes up space (volume). Matter can be measured (weight/mass).

You have a large glass of water and you stir salt into it until all the salt completely dissolves. This means the salt is _______ .

• soluble

• not soluble

Answer explanation

When a substance is evenly distributed and dissolved, that substance is soluble.

Tags

NGSS.MS-PS1-2

Which type of change only changes the appearance or look of matter?

• Physcial Change

• Chemical Change

Answer explanation

What evidence in the image shows that a chemical reaction has occurred?

• surprised face

• blue liquid

• new gas and bubbles

• orange t-shirt`

Answer explanation

Tags

NGSS.MS-PS1-2

Vinegar is mixed with milk and then strange white chunks form in the mixture. What type of change is this?

• Physical Change

• Chemical Change

Answer explanation

Tags

NGSS.MS-PS1-2

This is an example of a ______ molecule.

• simple

• complex

Answer explanation

A simple molecule is a group of a few atoms (3 or fewer).

Tags

NGSS.MS-PS1-1