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Chemical Equations and Reactions II Flashcards | StudBud
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Chemical Equations and Reactions II
Chemical Equations and Reactions II
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Review based upon Texas TEKS over chemical reactions and chemical equations being balanced.
Flashcards
16 cards
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Practice quiz
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Questions
16
Answers
1
The products of a chemical equation
Show the new substance and are on the right side
Always show there has been a physical change
Show the new substance and are on the left side
Can be shown during a chemical equation
2
Which of the following is least likely a sign of a chemical change.
mixing
precipitate
fizzing
burning
3
New substances form when
When the smell remains constant
When the solution is dissolved
A gas is produced
It is broken in pieces
4
Is the following equation balanced? N
2
+ 3H
2
→ 2NH
3
No
Yes
5
Read the following thermometer
16
13
18
17
6
According to the Law of Conservation of Mass
Matter is always created in a chemical reaction
Matter is not created nor destroyed just rearranged
Matter is destroyed in a chemical reaction
Matter is created then destroyed in a chemical reaction
7
How many molecules of CO
2
were formed here: CH
4
+ 2O
2
--> CO
2
+ 2H
2
O?
3
2
0
1
8
The subscript represents
the column you would find it in
the number of atoms of that element
the mass of the element
the atomic number of the element
9
How many total atoms do you see in potassium hydrogen phosphate
4
6
8
2
10
Does the following equation follow the Law of Conservation of Mass? 4Fe + 3O
2
→ 2Fe
2
O
3
No
Yes
11
What is the definition of a subscript?
solid that forms
The large # that tell about molecules
small # to the right of a symbol & tells the # of atoms
two or more elements chemically combined
12
What formulas show the models below correctly
H8C3O2 and H8C3O2
2 H6C4O3 and H2CO2
C2H6 and CO2H2
2CH6 and CH2O2
13
How many atoms are in the oxygen molecule?
6
15
2
40
14
Is the following equation balanced? CaCl₂ + H
2
O yields CaO + 2HCl
Yes
No
15
The following equations show
what is formed is shown as the reactants
Elements cannot be created or destroyed in chemistry
what you begin with will be the product you end with
molecules will be the same for each formula shown
16
Signs of a chemical change can be seen when
When a precipitate shows up and odor changes
Material dissolves and color changes
When the substance breaks down and color changes
When gas is produced and you mix substances
