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WorksheetsChemistry Remediation
Total questions: 120
Worksheet time: 4hrs 36mins
Name
Class
Date
1.
What happens in a chemical reaction
a)
atoms are destroyed
b)
atoms are created
c)
molecules are created
d)
atoms are rearranged
2.
A chemical equation is balanced by changing or adding
a)
chemical symbols
b)
subscripts
c)
coefficients
d)
reactants
3.
a balanced chemical equation shows the proportions of reactants and products necessary for
a)
the reaction to occur
b)
mass to be conserved
c)
energy use to be minimized
d)
electrolysis to occur
4.
in the reaction 2H2O -->2H2 +O2, if you start with 2 mol of water how many moles of Hydrogen gas are produced
a)
1
b)
2
c)
3
d)
4
5.
if you start with 5 mol of O2 in the reaction 2Mg + o2 --> 2MgO How many moles of Mg will you need?
a)
4
b)
5
c)
8
d)
10
6.
In a balanced chemical reaction the total mass of products always equals the
a)
molar mass of reactants
b)
atomic mass of reactants
c)
total mass of reactants
d)
proportional masses of reactants
7.
Particles in an atom that are neutral and have no charge are
a)
negatrons
b)
electrons
c)
neutrons
d)
protons
8.
The smallest particle of any particular type of matter is known by which of the following terms?
a)
Compound
b)
Atom
c)
Chemical
d)
Element
9.
all matter is made of what
a)
energy
b)
atoms
c)
electrons
d)
compounds
10.
If an atom has 3 electrons, how many protons does it have?
a)
1
b)
2
c)
4
d)
3
11.
If the number of protons equal the number of _____, the atom will have no charge
a)
protons
b)
neutrons
c)
electrons
d)
nucleus
12.
The subatomic particle with a negative charge is the
a)
electron
b)
proton
c)
neutron
d)
nucleus
13.
What is the atomic number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
14.
What is the mass number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
15.
An atom with an unequal number of protons and electrons is said to have (a) ___.
a)
no charge
b)
balance
c)
charge
d)
unbalance
16.
Ions are:
a)
atoms with a positive or negative charge
b)
atoms with no charge
c)
atoms with ONLY a positive charge
d)
atoms with ONLY a negative charge
17.
What does malleable mean?
a)
Can be melted easily
b)
can be hammered into a shape without shattering
c)
shatters easily
d)
hard to melt
18.
How many elements are in HHe
a)
3
b)
4
c)
2
d)
5
19.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
20.
How many elements are represented in the compound?
Na2CO3
Na2CO3
a)
1
b)
2
c)
3
d)
4
21.
How many total elements are in the compound C2H12O3?
a)
3
b)
17
c)
12
d)
2
22.
An element is defined by its number of
a)
protons
b)
electrons
c)
neutrons
d)
protons + electrons
23.
The electrons in the outermost energy level are called
a)
neutrons
b)
protons
c)
valence electrons
d)
isotopes
24.
Which of these elements has 3 valence electrons
a)
aluminum
b)
oxygen
c)
sodium
d)
helium
25.
Ionic bonds consist of
a)
2 nonmetals
b)
2 metals
c)
a metal and a nonmetal
26.
How many atoms of sodium is in one molecule of Na2O?
a)
1
b)
2
c)
3
d)
4
27.
What is the oxidation number of Magnesium (Mg)?
a)
+2
b)
-2
c)
whats an oxidation number
28.
All the elements in group 13 would have an oxidation number of ..
a)
+3
b)
-3
c)
0
29.
All the elements on the elements on the right of the periodic table are called...
a)
Metals
b)
Metalloids
c)
Nonmetals
30.
All the elements on the left side of the periodic table are called..
a)
Metals
b)
Metalloid
c)
Nonmetals
31.
If my charge becomes 2+ what does that say about me?
a)
I am stealing 2 electrons
b)
I am losing 2 electrons
c)
I am in period 2
d)
I have an atomic # of 2
32.
If I gain electrons I become
a)
Positive because I've added to my atom
b)
negative because I've added electrons
c)
same because i'm balanced
d)
equal because now I have electrons
33.
When metals bond with non-metals they form what type of bonds
a)
covalent
b)
ionic
c)
cooperative
d)
lewis
34.
How do the following two elements bond together?
Al3+ O2-
Al3+ O2-
a)
AlO
b)
Al2O3
c)
Al3O6
d)
Al3O2
35.
How do the following two elements bond together?
Na1+ F1-
Na1+ F1-
a)
NaF
b)
NaF3
c)
Na3F
d)
Na1F2
36.
Which equation below is balanced? (conservation of mass)
a)
H2O → H2 + O2
b)
Na + Cl2 → NaCl
c)
Al + Br2 → AlBr3
d)
PCl5 → PCl3 + Cl2
PCl5 → PCl3 + Cl2
PCl5 → PCl3 + Cl2
37.
This rule says that the amount of atoms in the reactants is equal to the amount of atoms in the products...
a)
Conservation of Energy
b)
E=MC2
c)
Conservation of Mass
d)
Rule of 8
38.
An element in period 2, group 3 would have how many valence (outer) electrons?
a)
3
b)
2
c)
5
d)
8
39.
When becoming an ion, an element with 6 valence (outer) electrons would have a charge of...
a)
2-
b)
2+
c)
6-
d)
6+
40.
a)
Chlorine wants to lose 7 electrons
b)
Chlorine wants to gain 1 electron
c)
Chlorine is stable
41.
a)
This is an ionic bond with electrons shared
b)
This is an ionic bond with electrons transferred
c)
This is a covalent bond with electrons shared
d)
This is a covalent bond with electrons transferred
42.
a)
This molecule would be named PCl3
b)
This molecule would be named ClP3
c)
This molecule would be named PCl
d)
This molecule would be named PCl3
43.
What bonds to make an ionic bonds?
a)
metals and metals
b)
metals and nonmetals
c)
nonmetals and metalloids
d)
nonmetals and nonmetals
44.
a)
The starred side represents the products
b)
The starred side represents the reactants
c)
The starred side represents a nuclear reaction
45.
Which of the following is NOT an indication of a chemical change?
a)
Change in color
b)
Formation of a precipitate
c)
Melting
d)
Change in temperature
46.
What are the molecules for water
a)
H2
b)
O2
c)
Cl2
d)
H2O
47.
How many protons does Helium have?
a)
4
b)
4.0026
c)
2
d)
1
48.
When two or more elements join together chemically,
a)
a mixture is formed
b)
nothing is formed
c)
a compound is formed
49.
How many electrons does Xenon have?
a)
131.20
b)
27
c)
54
d)
10
50.
What is the atomic number of carbon?
a)
6
b)
12
c)
12.011
51.
What is the atomic mass of carbon?
a)
6
b)
12
52.
How many neutrons would be in an atom of Fluorine?
a)
9
b)
10
c)
19
d)
18.998
53.
How many electrons would be in an atom of fluorine?
a)
9
b)
18
c)
18.998
d)
10
54.
What is the law of Conservation of Mass?
a)
A measure of how much mass is created or destroyed.
b)
Mass can neither be created nor destroyed during a chemical reaction.
55.
An atom consists of:
a)
An electron surrounded by a nucleus
b)
A nucleus containing electrons
c)
A nucleus surrounded by electrons
56.
What is the correct chemical symbol for sodium?
a)
NA
b)
Na
c)
na
57.
What are the groups in the periodic table?
a)
A row of similar elements
b)
A column of similar elements
c)
The boxes in the table
58.
Which of the following statements is correct?
a)
Protons are positively charged and neutrons are negatively charged.
b)
Protons are negatively charged and electrons are positively charged.
c)
Protons are positively charged and electrons are negatively charged.
59.
What is the atomic number of an atom?
a)
The number of atoms it contains.
b)
The number of protons it contains.
c)
The number of neutrons it contains.
60.
Which of the following statements is true of an atom?
a)
The number of protons is always equal to the number of neutrons.
b)
The number of protons is always equal to the number of electrons.
c)
The number of neutrons is always equal to the number of electrons.
61.
What do the elements in a group have the same number of?
a)
electrons
b)
occupied energy levels or shells
c)
electrons in the highest occupied energy level or outer shell
62.
What do the elements in a period have the same number of?
a)
electrons
b)
occupied energy levels or shells
c)
electrons in the highest occupied energy level or outer shell
63.
The characteristics or properties of metals include
a)
shiny and solid
b)
ductile and malleable
c)
lose electrons
d)
all of the above
64.
What do we call the part of the equation to the left of the arrow in this example
CH4 + O2 ---> CO2 +H2O
CH4 + O2 ---> CO2 +H2O
a)
product
b)
yield
c)
reactant
d)
action
65.
Identify the following compound
C6H12O6
C6H12O6
a)
Carbon Hydrogenate
b)
Hydrogen Peroxide
c)
sugar
d)
Water
66.
THE LAW OF CONSERVATION OF MATTER STATES THAT MASS BEFORE THE REACTION IS _____
a)
more after the reaction
b)
less after the reaction
c)
the same after the reaction
67.
Photosynthesis: the food making process of plants, a chemical reaction that is the reverse of________. The reactants are energy from the sun,______, and water to form ______ and oxygen.
a)
Digestion, Nitrogen, Sugar
b)
Respiration, CO2, Energy
c)
Respiration, Nitrogen, Glucose
d)
Respiration, CO2, Glucose
68.
Metals are shiny,______, and are good conductors of _____
a)
bend (don't break), heat and electricity
b)
hard and brittle, heat
c)
bend (don't break), electricity
d)
unadjustable, heat and electricity
69.
The chemical compound CO2:
a)
carbon dioxide
b)
carbon oxide
c)
air
d)
water
70.
The chemical compound H2O:
a)
salt water
b)
lemonaide
c)
water
d)
nothing
71.
If I have 5g of one substance and 5g of another substance in a reactant, what will the product weigh?
a)
5g
b)
10g
c)
20g
d)
Not able to predict.
72.
Which of the following is NOT evidence of chemical change?
a)
Change in phase.
b)
New substance formed
c)
Gas given off
d)
Precipitate formed.
73.
If I have 2CO2 in a reactant, how many carbon atoms will I have in the product?
a)
4
b)
2
c)
1
d)
none.
74.
If I have 2CO2 in a reactant, how many oxygen atoms will I have in the product?
a)
4
b)
2
c)
1
d)
none.
75.
Balance the following:
Na2CO3 + FeCl2 --> FeCO3 + NaCl
Na2CO3 + FeCl2 --> FeCO3 + NaCl
a)
2, 2, 1, 1
b)
2, 1, 1, 2
c)
1, 1, 1, 2
d)
3, 2, 5, 2
76.
Balance the following:
KClO3 --> KCl + O2
KClO3 --> KCl + O2
a)
2, 2, 3
b)
1, 1, 2
c)
2, 2, 1
d)
3, 3, 5
77.
Balance the following:
Ag + S8 --> Ag2S
Ag + S8 --> Ag2S
a)
5, 1, 8
b)
6, 1, 9
c)
16, 1, 8
d)
1, 2, 4
78.
Predict the products of the following equation:
P4 + O2 -->
P4 + O2 -->
a)
P2 + O2
b)
P3
c)
O2
d)
P2O3
79.
In the equation below, what are the reactants
2 H2 + O2 → H2O
2 H2 + O2 → H2O
a)
H2O
b)
2 H2 + O2
81.
In the equation below , what are the PRODUCTS
2 H2 + O2 → H2O
2 H2 + O2 → H2O
a)
2 H2 + O2
b)
H2O
81.
In the equation below , what are the PRODUCTS
2 H2 + O2 → H2O
2 H2 + O2 → H2O
a)
2 H2 + O2
b)
H2O
82.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
83.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same number of atoms
c)
Same subscripts
d)
Same superscripts
84.
The number of atoms of N (nitrogen) in 3N2O5 is
a)
5
b)
2
c)
6
d)
15
85.
Which of these is not a chemical reaction?
a)
Burning of wood
b)
Milk going bad
c)
Mixing vinegar and baking soda
d)
Melting of ice
86.
In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?
a)
4g
b)
5g
c)
9g
d)
14g
87.
If reaction starts with 20g of reactants it should produce
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
88.
Is this balanced?
2HgO → 2Hg + O2
2HgO → 2Hg + O2
a)
Yes
b)
No
89.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
90.
Law of conservation of mass states that
a)
matter is created
b)
matter is destroyed
c)
matter is neither created nor destroyed
d)
matter does not change
91.
True or false. Law of conservation of mass means that the number of atoms of the products is more than the number of atoms in the reactants.
a)
True
b)
False
92.
Which are chemical changes
a)
Iron rusting
b)
Glass breaking
c)
Clothing ripping
d)
Hair cut
93.
What is the law of conservation of mass?
a)
Matter changes when reacted or changed.
b)
The mass of all reactants are changed during a physical or chemical change
c)
The mass of the reactants is the same as the mass of the products
d)
The mass of the products is different than the mass of the reactants.
94.
The Law of Conservation of Matter is the reason a chemical equation MUST be:
a)
balanced
b)
unbalanced
95.
Which is Chemical Equation is Balanced?
a)
CH₄+O₂------CO₂+2H₂O
b)
H₂+O₂-----2H₂O₄
c)
4Al+3O₂-----2Al₂O₃
96.
How much does a 5 gram Hershey's kiss weigh after it is melted in the microwave?
a)
5 grams
b)
3 grams
c)
7 grams
97.
Which is Chemical Equation is Balanced?
a)
CH₄+O₂------CO₂+2H₂O
b)
H₂+O₂-----2H₂O₄
c)
4Al+3O₂-----2Al₂O₃
98.
Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble, and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.
a)
His chemical reaction defied the law of conservation of mass
b)
The product destroyed mass during the reaction
c)
The reactants created matter during the reaction
d)
The gas that was produced was not able to be weighed since the container was open.
99.
In the reaction shown by the equation, 252 grams of FeCl2 and 70 grams of Cl2 are consumed.
2FeCl2+ Cl2--> 2FeCl3
How many grams of FeCl3 are produced?
2FeCl2+ Cl2--> 2FeCl3
How many grams of FeCl3 are produced?
a)
161 grams
b)
182 grams
c)
322 grams
d)
392 grams
100.
Which equation best represents the law of conservation of mass?
a)
A
b)
B
c)
C
d)
D
101.
Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.
a)
His chemical reaction defied the law of conservation of mass
b)
The product destroyed mass during the reaction
c)
The reactants created matter during the reaction
d)
The gas that was produced was not able to be weighed since the container was open.
102.
In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25g. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?
a)
25g
b)
You can't tell with the given information.
c)
30g
d)
15g
103.
In a chemical reaction, the mass of the reactants was 15g. The mass of the products was 12g. Did this chemical reaction follow the law of conservation of mass?
a)
Yes
b)
No
c)
You can't tell with the given infomation
104.
The following chemical reaction occurs:
2S + 3O2 -> 2SO3
How many atoms of oxygen are there in the reactant?
2S + 3O2 -> 2SO3
How many atoms of oxygen are there in the reactant?
a)
2 atoms of oxygen
b)
3 atoms of oxygen
c)
6 atoms of oxygen
d)
1 atom of oxygen
105.
The following chemical reaction occurs:
N2 + 3 H2 -> 2 NH3
How many atoms of hydrogen are there in the product?
N2 + 3 H2 -> 2 NH3
How many atoms of hydrogen are there in the product?
a)
3 atoms of hydrogen
b)
2 atoms of hydrogen
c)
6 atoms of hydrogen
d)
1 atom of hydrogen
106.
The following chemical equation occurs:
CH4 + 2O2 -> CO2 + 2H2O
Does this equation follow the law of conservation of mass? In other words, are there the same number of carbon, hydrogen, and oxygen atoms in the reactants and the products?
CH4 + 2O2 -> CO2 + 2H2O
Does this equation follow the law of conservation of mass? In other words, are there the same number of carbon, hydrogen, and oxygen atoms in the reactants and the products?
a)
Yes
b)
No
c)
You can't tell with the given information
107.
There are two reactants in a chemical equation, and one product. The mass of the product is 30g. The mass of the first reactant is 17g. What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?
a)
47g
b)
13g
c)
23g
d)
You cant tell with the given information
108.
reactant→product
If there are 35 grams of reactant, how many grams of product are produced by the chemical reaction?
If there are 35 grams of reactant, how many grams of product are produced by the chemical reaction?
a)
17.5 g
b)
20 g
c)
35 g
d)
70 g
109.
A student draws a picture of the products and reactants of a chemical reaction. What, if anything, is wrong with the drawing?
a)
The drawing is wrongs because there are more chemicals on the products side.
b)
The drawing is correct because there are 12 compounds on each side of the arrow.
c)
The drawing is wrongs because there are different compounds on each side of the arrow.
d)
The drawing is correct because there are 12 atoms of each type on each side of the arrow.
110.
A + B→C + D
If there are 4 grams of product produced by the chemical reaction, how many grams of reactant were consumed?
If there are 4 grams of product produced by the chemical reaction, how many grams of reactant were consumed?
a)
0 g
b)
1 g
c)
2 g
d)
4 g
111.
Nonmetals form _________ bonds by sharing electrons to complete their valence shell and increase stability.
a)
Ionic
b)
Covalent
c)
Metallic
d)
Hydrogen
112.
Which statement accurately describes covalent bonds?
a)
Covalent bonds are formed by metals and nonmetals.
b)
Covalent bonds are typical of carbon compounds.
c)
Covalent bonds are created by the attractions between oppositiely charged ions.
d)
Covalent bonds break apart when dissolved in water and allow for the conduction of electricity.
113.
What kind of bond forms when one kind of atom gives electrons to another kind of atom?
a)
Chemical bon
b)
Ionic bond
c)
Covalent bond
d)
Electron bond
114.
Which of these is covalent?
a)
NaCl
b)
Pb(NO3)2
c)
CO2
d)
AlCl3
115.
Predict the bond that will form between Be and F.
a)
Ionic
b)
Covalent
116.
Predict the bond that will form between Se and Cl.
a)
Ionic
b)
Covalent
117.
The chemical composition of vinegar and baking soda is H2O+C2H4O2 and NaHCO3. The release of CO2 gas occurs when vinegar and baking soda are joined. The CO2 gas is referred to as
a)
the answer
b)
the reactant
c)
a surprise
d)
the product
118.
(Na) combines with chlorine (Cl 2 ) to form sodium chloride, or table salt (NaCl).
2 Na + Cl 2 → 2 NaCl
In the above chemical equation, what is the information to the left of the arrow?
2 Na + Cl 2 → 2 NaCl
In the above chemical equation, what is the information to the left of the arrow?
a)
Product
b)
Solution
c)
Reactants
d)
Chemical
119.
A sealed test tube containing 8 grams of iron filings and 5 grams of sulfur is heated until the material in the test tube glows bright red. What is the mass of products?
a)
Mass is less than 13 grams
b)
Mass is equal to 13 grams
c)
Mass is greater than 13 grams
d)
Mass cannot be measured
120.
The_______ are the most reactive metals.
a)
Alkali metals
b)
Bases
c)
Akili metals
d)
Halogens
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