Chemical reactions Part 2

What you will learn today:

1. Review Chemical equations

2. Define subscript and Coefficients

3. Learn to count atoms

counting is fun....counting is great....counting atoms is super really great....Let's go!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

​Where will I take notes?

Just a few defnitions on 34

Multiple Choice

What is the left part of a chemical equation called?
H_{2 +} O → H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Multiple Choice

Chemical reactions happen when _____ link atoms together.

• salt

• fireworks

• electrons

Multiple Choice

The Law of Conservation of Mass says that matter cannot be ________ or __________.

• Divided or Multiplied

• Balanced or Unbalanced

• Increased or Decreased

• Created or Destroyed

Multiple Select

Which of the following can by possible physical indicators of a chemical reaction?

• Formation of Gas

• Change in Color

• Emission of Light

• Sublimation of Solids

• Deposition of Gases

Multiple Choice

In a chemical reaction

• The atoms of the reactants always stay together to form the products
• The atoms of the reactants unbond, rearrange, and then rebond to form the products
• New atoms are formed which combine to make the products
• Some atoms disappear while others multiply to form the products

Multiple Choice

The reactants in the image above are:

• CH4 and 2 O2

• 2 H2O and CO2

• All of these are reactants

• All of these are products

​See if you can figure out ....

What the numbers mean​...

choose molecules

Home

Open in new tab

Copy link

Draw

Circle the coefficients

Draw

Circle the subscripts

Draw

Fill in the blanks below

Multiple Choice

How many atoms of hydrogen are in this compound?

• 1

• 2

• 3

• 4

Multiple Choice

How man atoms of carbon are there?

• 1

• 2

• 3

• 4

Multiple Choice

How many atoms of Iron are in this compound?

• 1

• 2

• 3

• 4

Multiple Choice

How many atoms of hydrogen are in

C₆H₁₂O₆

• 6

• 12

• 18

• 2

Multiple Choice

How many atoms of Hydrogen are in H₂O

• 1

• 2

• 3

• more than 3

Multiple Choice

How many different elements are present in H₂COCH₂

• 5

• 4

• 3

• 2

Multiple Choice

How many atoms are there TOTAL in H₂SO₄ ?

• 6

• 5

• 7

• 3

Multiple Select

What determines the reactivity of an element?

• protons

• neutrons

• electrons

• valence electrons

Multiple Choice

Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)

• H₃SO₄
• HSO₄
• H₄S₃O
• H₂O

Multiple Choice

How many elements are in this chemical formula? $$NaHCO_3$$  

• 1

• 2

• 3

• 4

Poll

How do you feel about counting atoms?

• Super easy. I am an expert

• I sort of get it but need some more practice

• I have no idea what is going on adn will need lots of help with this