HC07_C10 v01 Law of Conservation of Mass Video 01

The reactants are ________ of a chemical equation.

• on the left side (←)

• on the right side (→)

• in the middle

Which part of this reaction represents during the reaction (chemical change)?

How much oxygen gas is needed for the reaction shown?

Organize these options into the right categories

Groups:

(a) Reactant

,

(b) Product

• Al

How many moles of aluminum (Al) is needed to react with three(3) moles of oxygen gas (O₂)?

• NaCl

• H₂SO₄

• Na₂SO₄

• HCl

• NaCl

• H₂SO₄

• Na₂SO₄

• HCl

Categorize the following

Groups:

(a) coefficents

,

(b) subscript

,

(c) "and"

,

(d) produces, yields, make

• 1 (unwritten)

• +

• 3

• 4

• 2

Which law requires chemical reactions to be balanced?

• The Law of Conservation of Coefficients

• The Law of Balanced Reactions

• The Law of Coefficients

• The Law of Conservation of Mass

Which of these must stay the same in a chemical reaction/equation?

• Mass

• number of atoms

• type of atoms

  (an element has to show up on both sides)

• subscripts

• number of moles (coefficients)