2.3 Atoms and Molecules

In our experiment with Alka-Seltzer, the BTB turned yellow when Alka-Seltzer was added to the water. What evidence did this provide?

• CO2 was released

• O2 was released

• atoms left the box

• energy was transferred

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What gas is leaving the pop bottle?

• oxygen

• carbon dioxide

• methane

• water

Tags

NGSS.MS-PS1-2

When the gas leaves the bottle, which of the following is true?

• air particles disappear

• gas atoms go into the atmosphere

• air particles change into liquid

• gas atoms become different atoms

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

How many oxygen atoms are on the left side of the reaction?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

How many hydrogen atoms are on the left side of the reaction?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

How many oxygen molecules are on the left side of the reaction?

Mathematical Equivalence

OFF

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which of the following statements is true?

• All are true.

• The number of carbon atoms on the left side is greater than on the right.

• There are more oxygen molecules on the left than on the right.

• There are less oxygen atoms on the right side.

• Hydrogen atoms disappeared.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Categorize each part of the reaction

Groups:

(a) Atom

,

(b) Molecule

• methane - CH4

• oxygen

• water - H2O

• hydrogen

• carbon

• carbon dioxide - CO2

• oxygen - O2

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

NGSS.MS-PS1-1

How many water molecules are on the right side of the equation?

Mathematical Equivalence

OFF

Sort the molecules into organic or inorganic.

Groups:

(a) Organic Molecules

,

(b) Inorganic Molecules

• methane

• water

• methylamine

• sodium chloride (salt)

• sugar

• ammonia

• hydrochloric acid

• acetic acide

Tags

NGSS.MS-PS1-1