Chemical Reactions & EQ: Explore

Chemical Reactions & EQ: Explore

A pure element takes many forms. For example, diamond and graphite both are forms of pure carbon

FUN FACT 1

The human body contains enough carbon to provide "lead" (which is really graphite) for 9,000 pencils.

​​FUN FACT 2

​FUN FACT 3

​The only letter not appearing on the periodic table is J

Multiple Choice

How many states of matter are there?

• 2

• 3

• 4

• 5

Categorize

Options (6)

Tearing a piece of paper

Ice Cube melting

Cutting up fruit for fruit salad

Baking a cake

Burning a Candle

Plant respiration

Place the examples into the correct category.

Physical Change

Chemical Change

Multiple Choice

What is the name for a substance that changes the rate of a chemical reaction?

• Product

• Reactant

• Catalyst

• Ion

Multiple Choice

What is the right side of an equation called? (green)

HCL + KOH --> KCl + H2P

• catalyst

• reactant

• product

• isotope

• chemical change

• molecule

• product

• reactant

• endothermic

• exothermic

• conservation of mass​

​VOCAB

Exo - Greek exo - meaning outside, outer, external

Thermic - Greek therme - meaning heat

Heat that is released during a chemical reaction

Exothermic

​Endo - Greek enden - meaning INSIDE

Thermic - meaning HEAT

Heat is absorbed during a chemical reaction

Endothermic

​If a chemical change occurs:
-change in color
-change in odor
-neutralize acid
-heat
-light
-bubbles formed
-precipitate

Changes in Properties

​When an Acid and a Base are combined they produce SALT & WATER.

The salt is not acidic. This is how to neutralize a strong acid.

Neutralization of an Acid

​Endothermic - absorb heat

​Exothermic - give off heat

Energy is needed to break a bond between atoms.

​energy is released into the environment., increasing the temperature.
Example: Fireworks

Light, Heat, Sound, Electricity

Exothermic Reactions

​energy is absorbed or taken from environment and temperature decreases.
Example: Photosynthesis

​​Endothermic Reaction

​Solid substance formed when liquids are combined and chemical reaction occurs.

Precipitate

​Gas is formed when a chemical reaction occurs and see bubbles or frothing.

Gas

It is still sugar just in between the molecules of the liquid.

​

​Sugar Dissolving in a liquid is a PHYSICAL CHANGE

Multiple Choice

What caused the balloon to inflate?

• heat from the reaction caused balloon to expand

• change in state of vinegar from liquid to gas

• gas produced by chemical reaction of vinegar and baking soda

• energy released from chemical reaction

​A scientists who studied reactants and products of chemical reactions.
He determined that matter can change form, but it cannot be create of destroyed.


LAW OF CONSERVATION OF MASS

​Lavoisier

Used in front of single elements or molecules to show how many copies of that atom or molecule are there.

Example: 2HCl
2 hydrogen atoms & 2 Chlorine atoms

Coefficients

used to show how many atoms are inside

Example: H₂O

2 hydrogen atoms & 1 oxygen atom

​​Subscripts

Practice!

​2Fe₂O<sub>3

Number of Fe:

Number of O:</sub>

​2SO<sub>2

Number of S:

Number of O:</sub>

​3C₂H₆

Number of C:

Number of H:

Draw

Underline Reactants in BLUE.

Underline Products in RED.

Circle the Coefficients in ORANGE.

Circle the Subscripts in GREEN.

Have a GREAT DAY!!!

​See you TOMORROW!