The subscript represent

the number of atoms of that element

What is the definition of a subscript?

small # to the right of a symbol & tells the # of atoms

The products of a chemical equation

Show the new substance and are on the right side

Signs of a chemical change can be seen when

When a precipitate shows up and odor changes

According to the Law of Conservation of Mass

Matter is not created nor destroyed just rearranged

The following equations shows

Elements cannot be created or destroyed in chemistry

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Chemical Equations and Reactions

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Review based upon Texas TEKS over chemical reactions and chemical equations being balanced.

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Questions 16

Answers

1
How many atoms are in the Oxygen molecule?
15
2
30
6
2
The subscript represent
the mass of the element
the number of atoms of that element
the atomic number of the element
the column you would find it in
3
What formulas shows the models below correctly
2 H6C4O3 and H2CO2
2CH6 and CH2O2
C2H6 and CO2H2
H8C3O2 and H8C3O2
4
What is the definition of a subscript?
small # to the right of a symbol & tells the # of atoms
two or more elements chemically combined
solid that forms
The large # that tell about molecules
5
How many molecules of CO₂ were formed in this lab experiment?
6
24
12
2
6
Which of the following is least likely a sign of a chemical change.
fizzing
precipitate
burning
mixing
7
The products of a chemical equation
Show the new substance and are on the left side
Always show there has been a physical change
Can be shown during a chemical equation
Show the new substance and are on the right side
8
Signs of a chemical change can be seen when
Material dissolves and color changes
When the substance breaks down and color changes
When gas is produced and you mix substances
When a precipitate shows up and odor changes
9
Does this equation follow the Law of Conservation of Mass? 4Fe + 3O₂ → 2Fe₂O₃
No
Yes
10
According to the Law of Conservation of Mass
Matter is destroyed in a chemical reaction
Matter is created then destroyed in a chemical reaction
Matter is not created nor destroyed just rearranged
Matter is always created in a chemical reaction
11
New substances form when
It is broken in pieces
When the smell remains constant
When the solution is dissolved
A gas is produced
12
Read the following thermometer
17
13
16
18
13
Is the following equation balanced? CaCl₂ + H₂O yields CaO + 2HCl
Yes
No
14
How many total atoms do you see in potassium phosphate
8
6
4
2
15
The following equations shows
what is formed is shown as the reactants
what you begin with will be the product you end with
Elements cannot be created or destroyed in chemistry
molecules will be the same for each formula shown
16
Is the following equation balanced? N₂ + 3H₂ → 2NH₃
Yes
No

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