Chemical Equations-Counting Atoms(TEK 7C)

Law of Conservation of Mass & Counting Atoms

TEK-7C Law of Conservation of Mass

Before we start-

Multiple Choice

How many elements are in C₆H₁₂O₆?

• 24

• 432

• 3

• 1

Multiple Choice

Which one is a compound?

• C

• Br

• Fe

• NaCl

Multiple Choice

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is less than the total mass of the products.

• Matter is not changed.

Multiple Choice

Which is the Law of Conservation of Matter?

• matter cannot be created or destroyed, it only changes form

• matter can be created but it cannot be destroyed, it never changes form

• matter can be destroyed but it cannot be created, it usually just changes form

• matter is an unproven theory created by Hans Geiger

Multiple Choice

The substances listed on the left side of a chemical equation are the

• Products

• Coefficients

• Precipitates

• Reactants

Multiple Choice

The right side of the equation below is called the

• products

• reactants

Multiple Choice

The blue numbers in the image below represent ________

• I don't know, and don't want to try
• coefficients
• subscripts
• none of the answers are correct

Multiple Choice

This is the BIG number that appears in front of a chemical formula, and represents how many molecules there are.

• An Atom

• The Subscript

• A Molecule

• The Coefficient

Let's Practice....

Multiple Choice

This is used to represent the number of each atom being represented.

• An exponent

• The coefficient

• A molecule

• The subscript

Multiple Choice

The red numbers in the image below represent ________

• subscripts
• coefficients
• I don't know, and don't want to try
• None of the answers are correct

Multiple Choice

How many Iron (Fe) and Oxygen (O) are there?

• Fe = 1, O = 2

• Fe = 2, O = 3

• Fe = 2, O = 1

• Fe = 1, O = 3

Multiple Choice

How many hydrogen atoms are in this chemical formula:

• 4 hydrogen atoms

• 1 hydrogen atom

• 2 hydrogen atoms

• 3 hydrogen atoms

Multiple Choice

Identify the Reactants in this equation.

• A

• B