Chemical Reactions
Presentation
•
Science
•
6th - 9th Grade
•
Practice Problem
•
Easy
+4
Standards-aligned
Ruby Aguilar
Used 47+ times
FREE Resource
8 Slides • 9 Questions
1
Chemical Reactions
2
Open Ended
Think-Share:
What first comes to mind when you hear the words CHEMICAL REACTION?
(you have 1 minute)
3
How can you tell a chemical reaction is happening?
A change of color occurs during the reaction
A gas is produced during the reaction.
A solid product called a precipitate is produced during the reaction.
A transfer of energy occurs as a result of the reaction.
4
Example 1: Color Change
A solution of potassium permanganate is added to a solution of sodium hydroxide and sugar.
Notice how the colors change as the reaction continues
5
Poll
When food coloring is added to water, is a chemical reaction taking place?
Yes
No
6
A chemical reaction is NOT taking place? WHY???
Your reactants are food coloring and water and the product is food coloring and water.
There were no other signs of a chemical reaction taking place
The color change of water (went from clear to the color of the food coloring) was predictable. Often the color change in a chemical reaction are not necessarily predictable (as in the video)
7
Example 2: gas production
When zinc reacts with nitric acid, the reaction bubbles vigorously as Nitrogen gas is produced. The production of a gas is also an indication that a chemical reaction is occurring.
8
Example 3: precipitate formation
When a colorless solution of lead(II) nitrate is added to a colorless solution of potassium iodide, a yellow solid called a precipitate is instantly produced.
9
Transfer of Energy
All chemical changes involve a transfer of energy.
Energy/heat can be absorbed =Endothermic reaction.
Or
Energy/heat can be given off=Exothermic reaction
10
Example 4: Energy Transfer
Sodium and water produce an explosion. Energy/heat is being released. This is an exothermic reaction.
11
Open Ended
In two minutes,
write the four indicators of a chemical change.
12
Multiple Choice
Which of the following describes changes in energy during a chemical reaction?
Changes in energy do not occur during a chemical reaction.
Energy is always released during a reaction.
Energy may be either absorbed or released during a reaction.
Energy is always released during a reaction.
13
Multiple Select
Which of the following indicated a chemical change/chemical reaction?
Precipitate formation
Transfer of heat energy
14
Open Ended
Two reactants are mixed in a test tube, and the test tube becomes very warm. This is a sign of a transfer of ______ taking place.
15
Multiple Select
What state of matters, when produced, is a sign that a chemical reaction is occuring?
gas
liquid
solid
plasma
16
Multiple Choice
When a color change happens, a chemical reaction must have occurred.
false
true
17
Poll
Lesson Reflection: How confident do you feel in your ability to determine if a chemical change has occurred?
very confident
confident
partly confident
not confident at all
Chemical Reactions
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