Law of conservation of energy is?

States that energy cannot be created or destroyed

What is the purpose of balancing chemical equations?

to obey the law of conservation of mass

An Endothermic Reaction is...

a chemical reaction that absorbs energy primarily in the form of heat

What is chemical equilibrium?

The state in which the forward and reverse reaction rates are equal.

N2O4(g) ⇌ 2NO2(g), during equilibrium:

the reaction continues to happen

A Decomposition Reaction is...

a chemical reaction in which one substance breaks down into two or more

Step #1 to balancing equations is

relax and count all atoms on both sides

What is step 2 to balancing equations?

Write down number of atoms per element on each side

What is the third step to balancing a chemical equation?

Check number of atoms of each side

What is Chemical Energy

Energy stored in the bonds of chemical compounds

A Single-Displacement Reaction is...

one element replaces another element in a compound.

A Double -Displacement Reaction is...

the positive ion of one compound replaces the positive ion of the other

As the temperature of a reaction increases, the rate of the reaction increases because the __________.

reactant molecules collide more frequently

A reaction is a chemical change, new substances are formed

The Law of Conservation of Mass states:

Matter cannot be created and it cannot be destroyed.

A Synthesis Reaction is...

a synthesis reaction in which two or more substances combine to form one, a chemical reaction in which two or more substances combine to form another

You can tinker with chemical equilibrium by altering which three factors?

concentration, temperature and pressure

A endothermic reaction...

process absorbs heat and cools the surroundings

A chemical equilibrium exists when:

the rate to form products =the rate to form reactants.

D. both the forward and reverse reactions continue.

What is a Chemical Reaction?

The process in which atoms produce new substances

Why are there chemical formulas?

To see what is actually happening in a reaction

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IPC Ch. 7 Rev.

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Answers

1
Law of conservation of energy is?
States that energy cannot be created but destroyed
States that energy can be created but not destroyed
States that energy cannot be created or destroyed
States that energy can be created or destroyed
2
What is the purpose of balancing chemical equations?
to obey the law of conservation of mass
it isn't important at all
to make it look neater
it may be helpful for subsequent questions
3
An Endothermic Reaction is...
compound that comes out of solution during a double-displacement
a chemical reaction that absorbs energy primarily in the form of heat
a chemical reaction that absorbs energy primarily in the form of cold
a chemical reaction that releases energy primarily in the form of heat
4
What type of Reaction is this?
Synthesis
Double Replacement
Combustion
Single Replacement
5
What is chemical equilibrium?
when the forward reaction rate and reverse reaction rate are not equal.
The state in which the forward and reverse reaction rates are equal.
when a system experiences a disturbance.
I dont Know.
6
A catalyst is a substance that ____ the rate of a chemical reaction
Maintains
Speeds up
Does not affect
Slows down
7
N₂O₄(g) ⇌ 2NO₂(g), during equilibrium:
the reaction continues to happen
the reaction pauses for a short time
the reaction speeds up
the reaction stops
8
What type of reaction is this?
Double Replacement
Dissociation
Single Replacement
Synthesis
9
When balancing Equations what does --> mean?
Product
Subscript
Yield
It's just an arrow?
10
How many moles are in 98g of Nitrogen?
7
35
3.5
70
11
A chemical reaction that releases heat is a exothermic reaction
False
True
12
A Decomposition Reaction is...
a chemical reaction in which two or more substances combine to form another
a synthesis reaction in which two or more substances combine to form anothe
a chemical reaction in which one substance breaks down into two or more
a substance (fuel) reacts with oxygen to release energy in the form of heat
13
Which of the following equations follows the Law of Conservation of Mass?
3H2O2 → 2H2O + 2O2
H2O2 → 2H2O + O2
2H2O2 → 2H2O + 2O2
2H2O2 → 2H2O + O2
14
Step #1 to balancing equations is
relax and count all atoms on both sides
look at it and panic
15
What is step 2 to balancing equations?
Rewrite equation
Start by making the equations balanced with coeficents
Write down number of atoms per element on each side
Adding coeficents
16
one element is replaced in the chemical reaction is what?
single replacement
double replacement
17
two elements are replaced in the chemical reaction is what?
coefficents
double replacement
18
substances that undergo chemical change; chemicals on the left side of the reaction are?
products
reactants
19
What is the third step to balancing a chemical equation?
List elements in the equation
Balance atoms one at a time by adjusting coefficients.
Write without the coefficients
Check number of atoms of each side
20
Chemical equilibrium symbol
True
False
21
What is Chemical Energy
Energy stored in the bonds of chemical compounds
Energy stored in the
Matter
Atoms
22
How many moles are in 92g BCl?
2
92
46
1
23
A Single-Displacement Reaction is...
a chemical reaction in which two or more substances combine to form another
one element replaces another element in a compound.
a synthesis reaction in which two or more substances combine to form anothe
a chemical reaction in which two or more substances combine to form another
24
A Double -Displacement Reaction is...
a chemical reaction in which two or more substances combine to form another
a chemical reaction in which two or more substances combine to form another
one element replaces another element in a compound.
the positive ion of one compound replaces the positive ion of the other
25
As the temperature of a reaction increases, the rate of the reaction increases because the __________.
activation energy is lowered
reactant molecules collide less frequently
kinetic energy of the reactant particles decreases
reactant molecules collide more frequently
26
What is a reaction?
A reaction is a chemical change, new substances are formed
A chemical change is nothing but boring science
A reaction is a chemical change, new elements are formed
A chemical reaction is a reaction where new atoms are formed
27
How many grams are in 2 moles of Carbon?
6 grams
2 grams
24 grams
12 grams
28
All chemical equations must be:
complex.
rearranged.
balanced.
incomplete.
29
substance that speeds up rate of chemical reaction is?
catalysts
coefficents
30
5.198 moles of water
93.564 grams
3.46 grams
3.46 liters
93.564 liters
31
Chemical equations are written
products + reactants
reactants + products
products = reactants
reactants ---> products
32
What type of reaction is this?
Decompostion
Combustion
Single Replacement
Dissociation
33
which of the following equations is balanced?
3K + 2H + S ---> K + 2HS
2K + 3HS ---> 2H + 3S + K
2K + 3H +6S ---> 2K + 3HS2
2K + 2H + 2S ---> K2H2S
34
The Law of Conservation of Mass states:
Matter is not real.
matter can be created and destroyed.
Matter cannot be created and it cannot be destroyed.
Matter can not be created but it can be destroyed.
35
A Synthesis Reaction is...
a substance (fuel) reacts with oxygen to release energy in the form of heat
a reaction in which the energy released is in the form of heat
a synthesis reaction in which two or more substances combine to form one
a chemical reaction in which two or more substances combine to form another
36
Which of the following equations follows the Law of Conservation of Mass?
2Zn + 2HCl → 2ZnCl2 + H2
Zn + HCl → ZnCl2 + H2.
2Zn + 2HCl → ZnCl2 + H2
Zn + 2HCl → ZnCl2 + H2
37
You can tinker with chemical equilibrium by altering which three factors?
the catalyst, temperature and solubility
concentration, temperature and a catalyst
concentration, temperature and pressure
concentration, solubility and pressure
38
A endothermic reaction...
process releases heat, causing the temperature of the surrounding to rise
process absorbs heat and cools the surroundings
39
When balancing equations, you may change...
both subscripts and coefficients
neither subscripts nor coefficients
coefficients
subscripts
40
What factor affects reaction rate?
Solubility
Ductility
Elasticity
concentration
41
Which is NOT a factor that affects reaction rate?
surface area
precipitate
concentration
temperature
42
As the surface area of a reactant increases, the rate of the reaction
increases
remains the same
decreases
43
15. Six moles of O₂ is ______ grams.
96 grams
16 grams
192 grams
160 grams
44
Balancing of chemical equations is based on
types of reaction
atoms and moles
law of conservation of mass
45
A chemical equilibrium exists when:
equal amounts of reactants and products.
reactants are completely changed to products.
the rate to form products =the rate to form reactants.
the sum of reactant and product concentrations = 1 mol
46
10. At equilibrium,
B. only the forward reaction continues.
C. only the reverse reaction continues.
D. both the forward and reverse reactions continue.
A. all reactions have ceased.
47
What is a Chemical Reaction?
The process in which an atom changes its shape
The process in which an atom changes it's substance
Is the Process in which atoms are rearranged to produce Subs
The process in which atoms produce new substances
48
A substance produced during a chemical reaction
atom
solid
product
matter
49
Why are there chemical formulas?
sciencetists made it up to make chemistry more fun
To see what is actually happening in a reaction
to see if people understands chemistry
To help kid learn math
50
How many moles are in 100g of Zn?
1.35 moles
1.54 moles
3.15 moles
96 moles
51
Cooling has an ______ effect on equilibrium.
Range
Increase
Reduce
Opposite

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