In the previous lesson, we realized that it is not always possible to figure out whether or not a chemical reaction has happened just by observing changes in properties. Today, we’ll look at the nanoscale to figure out if a chemical reaction has happened or not.
Did a Chemical Reaction Happen?
Chemical Reaction - Substances are mixed and at least one new substance with different properties (with different molecules) is formed.
Directions:
Analyze each diagram. Look carefully at both the observablescale and the nanoscale.
Think about whether there is evidence that a chemical reaction happened.
Answer the question below each diagram.
Question 2
2.
Question 3
3.
Question 4
4.
Question 5
5.
Ice Melting: Explain why this is not a chemical reaction?
Sentence starter: Ice melting is not a chemical reaction because _____________
Question 6
6.
Question 7
7.
Question 8
8.
Question 9
9.
Paint Mixing: Explain why this is not a chemical reaction?
Sentence starter: Paint mixing is not a chemical reaction because _____________
Question 10
10.
Question 11
11.
Question 12
12.
Question 13
13.
Baking Soda and Vinegar Mixing: Explain why this is a chemical reaction?
Sentence starter: Baking Soda and Vinegar mixing is a chemical reaction because _____________
Modeling Chemical Reactions
We know that during a chemical reaction, new substances and molecules form. But where do the new molecules come from? Let’s find out by modeling the reactions we’ve studied.
Baking Soda and Vinegar
Go to the amplify model by clicking this link: https://apps.learning.amplify.com/modelingtool/#/tool/175/level/53_Baking_Soda_and_Vinegar_id_2970
1. Together with your class, use the Baking Soda and Vinegar Model to show which atoms make up the molecules that form after baking soda and vinegar react.
2. Look at the molecule key to see which atoms are in each molecule.
Use this diagram / model to answer the questions below:
Question 14
14.
Question 15
15.
Question 16
16.
Question 17
17.
Question 18
18.
Question 19
19.
Question 20
20.
Question 21
21.
Question 22
22.
What do you notice about the number of atoms of each substance (chemical) BEFORE and AFTER the chemical reaction?
Using the chart (picture above) to help you if you need it, match the vocabulary word to the correct definition by writing the letter of the word in the box.
Atom
Matter that is made of only one kind of atom or molecule
Matter
Matter that is made of more than one substance
Substance
The stuff that things are made of
Molecule
A tiny piece of matter that is too small to see
Mixture
A group of atoms joined together in a particular way
Ice Melting: Is there evidence of a chemical reaction?
A) Color change
B) Taste change
C) Temperature change
D) Gas is made
E) Electricity is made
G) Light is made
Ice Melting: Did a new substance (with new molecules) form?
A) Yes
B) No
Ice Melting: Is this a chemical reaction?
Chemical Reaction - Substances are mixed and at least one new substance with different properties (with different molecules) is formed.
A) Yes
B) No
Paint Mixing: Is there evidence of a chemical reaction?
A) Color change
B) Taste change
C) Temperature change
D) Gas is made
E) Electricity is made
G) Light is made
Paint Mixing: Did a new substance (with new molecules) form?
A) Yes
B) No
Paint Mixing: Is this a chemical reaction?
Chemical Reaction - Substances are mixed and at least one new substance with different properties (with different molecules) is formed.
A) Yes
B) No
Baking Soda and Vinegar Mixing: Is there evidence of a chemical reaction?
A) Color change
B) Taste change
C) Temperature change
D) Gas is made
E) Electricity is made
G) Light is made
Baking Soda and Vinegar Mixing: Did a new substance (with new molecules) form?
A) Yes
B) No
Baking Soda and Vinegar Mixing: Is this a chemical reaction?
Chemical Reaction - Substances are mixed and at least one new substance with different properties (with different molecules) is formed.
A) Yes
B) No
How many Sodium (Na) atoms are there BEFORE the chemical reaction?
A) 1 atom
B) 2 atoms
C) 3 atoms
D) 4 atoms
E) 5 atoms
How many Sodium (Na) atoms are there AFTER the chemical reaction?
A) 1 atom
B) 2 atoms
C) 3 atoms
D) 4 atoms
E) 5 atoms
How many Carbon (C) atoms are there BEFORE the chemical reaction?
A) 1 atom
B) 2 atoms
C) 3 atoms
D) 4 atoms
E) 5 atoms
How many Carbon (C) atoms are there AFTER the chemical reaction?
A) 1 atom
B) 2 atoms
C) 3 atoms
D) 4 atoms
E) 5 atoms
How many Hydrogen (H) atoms are there BEFORE the chemical reaction?
A) 1 atom
B) 2 atoms
C) 3 atoms
D) 4 atoms
E) 5 atoms
How many Hydrogen (H) atoms are there AFTER the chemical reaction?
A) 1 atom
B) 2 atoms
C) 3 atoms
D) 4 atoms
E) 5 atoms
How many Oygen (O) atoms are there BEFORE the chemical reaction?
A) 1 atom
B) 2 atoms
C) 3 atoms
D) 4 atoms
E) 5 atoms
How many Oygen (O) atoms are there AFTER the chemical reaction?
