Law of Conservation of Mass/Balance Equations
Presentation
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Science
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7th - 8th Grade
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Practice Problem
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Medium
+1
Standards-aligned
Julie Avalos
Used 29+ times
FREE Resource
10 Slides • 17 Questions
1
Physical and Chemical Changes
Review
2
Physical Change
Substance changes appearance but it is still the same substance
Water can be a solid, liquid or gas, and it is still H2O.
3
Chemical Changes
Changes to substance forms new substance with different properties
When Iron combines with oxygen it forms the new substance of rust.
4
Multiple Choice
Indicate whether the photo depicts a physical change or chemical change.
5
Multiple Choice
Indicate whether the photo depicts a physical change or chemical change.
6
Multiple Choice
Indicate whether the photo depicts a physical change or chemical change.
7
Multiple Choice
Indicate whether the photo depicts a physical change or chemical change.
8
Multiple Choice
9
Law of Conservation of Matter
Matter cannot be created or destoyed in a chemical reaction
What you start with, you end with. It is rearranged to form something new.
Hydrogen gas combines with Oxygen gas to form water which is a liquid.
10
Chemical Equations
•A representation of a chemical reaction using symbols of the elements
•Quick and easy way to show a chemical reaction using symbols instead of words
•There are 2 sides to a chemical equation – Reactants and Products
11
Reactants
on the left side of the chemical equation
the compounds that react and change
12
Multiple Choice
Which are the reactants in this chemical equation?
13
Multiple Choice
Which are the reactants in this chemical equation?
14
Products
substance formed in a chemical reaction
on the right side of the chemical reaction
15
Multiple Choice
Which are the products in this chemical equation?
16
Multiple Choice
Which are the products in this chemical equation?
17
Balancing equations
Count the number of atoms on the reactant side
Count the number of atoms on product side
Compare each element to see if they have the same amount of atoms
18
Multiple Choice
How many Oxygen atoms are in the reactant side in this chemical reaction?
19
Multiple Choice
How many atoms are represented in the reactant side in this chemical reaction?
20
Multiple Choice
How many atoms are represented in the product side in this chemical reaction?
21
Multiple Choice
Is this chemical equation balanced or unbalanced?
22
Evidence of Chemical Reaction
Odor
Light
Precipitate
Gas
Color
Temperature
Formation of a new substance
23
Multiple Choice
Which is not evidence that a chemical reaction occurred in the fireworks display?
24
Multiple Choice
Which is the least likely evidence that a chemical reaction occurred?
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26
Multiple Choice
Use the density triangle to determine the density of an object with the mass of 21.7 and volume of 3.
27
Multiple Choice
Use the density triangle to determine the density of an object with the mass of 8.14 g and volume of 3.
Physical and Chemical Changes
Review
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