Physical and Chemical Changes
Periodic Table Scavenger Hunt
Chemical Equations
Bohr Models and Periodic Table Part 2
Random
100
What is the definition of a physical change?
No new substance is created and it can be reversed
100
What is the atomic number for Osmium?
76
100
In the equation: 2H2 + 20 -> 2H20 + H2 , which side is the products? (left or right)?
The right side
100
How many electrons can fit on the innermost shell (circle) in a Bohr model?
2 electrons
100
Draw a Bohr model for Fluorine
1st: 2
2nd: 7
200
What is the definition of a chemical change?
A new substance was created and it is impossible (or near impossible) to reverse.
200
What is the atomic mass for Potassium?
39
200
How many carbon are on the left side of the equation?
3C2H + C -> 3C2 + HC + H2
There are 7 carbon
3C2 = 6
C = 1
6 + 1 =7
200
How many electrons can fit on the 2nd shell (circle) of the Bohr model?
8 electrons
200
How many neutrons does Scandium have?
24 neutrons
300
Name TWO examples of a physical change.
Examples: cutting paper, sharping a pencil, food coloring, mixing sugar and salt, glass breaking
300
How many protons does Sodium have?
11 protons
300
How many hydrogen atoms are in the chemical equation below (both sides):
2H2O + HO -> H2O2 + H3
2H2O + HO -> H2O2 + H3
2H2 = 4 H2 = 2
H = 1 H3 = 3
4 + 1 = 5
2 + 3 = 5
5 + 5 =10 hydrogen
300
What element is shown here?
Aluminum
300
Name an example of a chemical change that we did during a lab in class
multiple answers
400
Name TWO examples of a chemical change.
Examples: rust, lighting a fire, fireworks, unexpected temperature or color change,
400
How many electrons does Chromium have?
24 Electrons
400
How many hydrogen do I need on the right side in order to balance the equation?
2H2 + H02 -> ____H + 02
The left side has 5 hydrogen, so you would need 5.
2H2 + H02 -> 5H + 02
400
Draw a Bohr model for Iron.
1st: 2
2nd: 8
3rd: 16
400
What period is Cesium in on the periodic table?
6
500
Two clear liquids are mixed together and turn purple. Is this a chemical or physical change? Why?
Chemical change because it is an unexpected color change
500
How many neutrons does Silver have?
61 neutrons
500
In a chemical equation, what is the left side of the equation called?
Example: 2H2 + 20 -> 2H20 + H2
The reactants
500
What is wrong with this Bohr model?
1st: should have 2
2nd: should then have 1
do not need the 3rd level anymore
500
How many groups are on the periodic table?
18