Lesson chem equations & chem reactions
Presentation
•
Science
•
9th - 12th Grade
•
Hard
+1
Standards-aligned
Nadine Brown
Used 1+ times
FREE Resource
38 Slides • 25 Questions
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Multiple Choice
Which of the following is an example of a chemical change?
Melt ice
Dissolve sugar in water
Burn a piece of wood
Boil water
crush ice
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chemical changes
combust, burn, ferment, tarnish, corrode, rust, oxidize, neutralize, react with, digest, rot, decompose
physical changes
dissolve,
any change in state (phase) like boil or condense or evaporate or melt or freeze,
cut or slice or crush or trim
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Dropdown
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Multiple Choice
Which of the following best describes a chemical reaction?
A process where substances are physically mixed together
A chemical change where reactants are transformed into different products
A process where substances are separated by physical means
changes in state like boiling, evaporating, melting, freezing, condensing
dissolving, crushing, trimming
7
Match
Match the following
reactants
products
coefficients
subscripts
yields sign
present at start of reaction
newly made at end of reaction
of each type of reactant or product
atoms inside one molecule
arrow separating reactants & products
present at start of reaction
newly made at end of reaction
of each type of reactant or product
atoms inside one molecule
arrow separating reactants & products
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Multiple Choice
Which one of these is NOT evidence that a chemical change has occurred after two compounds are mixed together.
compounds dissolve
gas bubbles form
color changes
new solid (precipitate) forms
temperature changes a lot
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Multiple Choice
If a chemical equation describes a chemical change, then the chemical formulas of reactants are ALWAYS DIFFERENT from the chemical formulas of products.
true
false
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Multiple Choice
Which of the following statements about reactants and products in a chemical reaction is correct?
Reactants are formed (made) ; products are destroyed (used up)
Reactants are used up (altered); products are formed
reactants & products have the same chemical formulas
products are always bigger than reactants
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Multiple Choice
True or False. During a chemical change, atoms are rearranged as old bonds are broken and new bonds are made
true
false
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Dropdown
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Multiple Select
Which of the following are true about coefficients and subscripts in a chemical equation?
Coefficients are in front of a chemical formula & on the line
Subscripts are written inside chemical formulas & under the lines
Coefficients tell you how many molecules are present
a subscript shows the # atoms of the left element
all of these are true
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Math Response
According to the law of conservation of mass, if 3.0 g and 5.9 g of reactant are used, then what mass of product is formed?_._g
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Math Response
If 15.0 g products are made from two reactant and if one of those had a mass of 10.0 g, then what is the mass of the other reactant?_._g
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Multiple Choice
What is the coefficient of carbon dioxide in this balanced equation?
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3
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Multiple Choice
What is the subscript of in H in the dihydrogen monoxide product in this balanced equation?
1
2
3
4
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Multiple Select
When is the law of conservation of mass obeyed? Choose 2.
when a chemical equation is balanced
when all atoms are equal in #s in reactants & product
when reactants & products have the same formulas
When none of the reactant is used up.
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Multiple Select
Select three correct rules for counting atoms in a chemical formula.
Coefficients go to the entire compound.
Subscripts affect only the element to the left of the subscript.
Subscripts propagate through parentheses if to the right of them.
Coefficients and subscripts are added together.
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Multiple Choice
Which one of the following statements about subscripts and coefficients is correct?
Subscripts apply to the entire compound.
Coefficients only affect the element immediately to their right.
Coefficients apply to the entire compound, while subscripts only affect the element to their left.
Subscripts and coefficients are interchangeable.
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Al 3 x 2 = 6
S 3 x 1 x 3 = 9
O 3x 4 x 3 = 36
3Al2(SO4)3
Cu 1 x 1 = 1
N 1 x 1 x 2 = 2
O 1 x 3 x 2 = 6
Cu(NO3)2
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Math Response
How many O atoms on the reactants side of this chemical equation? Cu + 2AgNO3 --> Cu(NO3)2 + 2Ag
35
Math Response
How many O atoms on the products side of this chemical equation? Cu + 2AgNO3 --> Cu(NO3)2 + 2Ag
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Math Response
What is the subscript of N in 2AgNO3 ?
Cu + 2AgNO3 --> Cu(NO3)2 + 2Ag
37
Multiple Choice
What is the coefficient of product lead iodide?
H2O(l) +PbCO3 (aq) + 2AgI (ag) --> PbI2(s) + Ag2CO3(aq) + H2O(l)
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4
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Multiple Choice
Which is a solid?
H2O(l) +PbCO3 (aq) + 2AgI (ag) --> PbI2(s) + Ag2CO3(aq) + H2O(g)
reactantPbCO3
reactant PbI2
product PbI2
H2O
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Multiple Choice
Which of the following statements is correct according to the rules for balancing chemical reactions?
change coefficients but not subscripts.
change subscripts but not coefficients.
change both coefficients & subscripts.
You cannot change any #s in the equation
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Fill in the Blanks
Fill in the blank: In balancing chemical equations, you can change the
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63
Multiple Choice
Which of the following is an example of a physical change based on the experiments shown?
Mixing two clear liquids to form a white solid (Station 5)
Burning a strip of magnesium (Station 2)
Dissolving a solid in water (Station 9)
A glowing flask (Station 4)
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