WorksheetsChemistry Semester Exam review
Total questions: 36
Worksheet time: 18mins
For something to become a theory what must occur?
One scientist must prove his hypothesis
Many scientists must be able to recreate the results of a hypothesis.
everybody thinks it is correct
scientist must vote evey year
What is the lewis dot structure for K Potassium?
What happens when a Group 1 and a Group 7 element react?
an ionic bond forms from transferred electrons
A covalent bond forms form shared electrons
and explosion occurs
an ionic bond forms from shared electrons
2 non metals reacting form which type of bond?
Covalent
metalic
ionic
loving
What is the correct Formula and charge for the Nitrate ion?
NO2-1
NO3+1
NO3+2
How do you catch a unique rabit?
money
unique up on him
What is the formula for this compound?
Zinc(II) Nitrate
Zn(NO3)2
ZnNO3
Zn2(NO2)2
Peter
A pure substance contains only one type of element or compound.
Which of the following is a pure substance?
What is the dot structure for the ionic compound NaCl?
How many bonds does Carbon form when bonding covalently?
1
2
4
1,000,000
Balance this equation for an oxidation reaction Hint you have to use a fraction
__PH3 + __O2 -->__PO_ H2O
2, 5, 2, 3
1, 1, 1, 1
4, 2, 6, 3
Wha is the mole ration of HF to MnO2 for this reaction?
4HF + MnO2 --> 2H2O + MnF2 + F2
1:2
4:1
3:1
How many formula units are in 15 grams of Ca(OH)2?
Avagadros # 6.023 x 1023
6.023 x 1023
1.2
1.2 x 1023
How many moles of H20 can be formed from .47 moles of O2 reacting with excess H2?
2H2 + O2 --> 2H2O
.47 moles
.94 moles
1 mole
a lot
What mass of O2 would completely react with 28 g CO to produce 44 g or CO2?
balanced equation CO + O2 -->CO2
32g
64g
28g
whats CO2
What is the molar mass of H2O?
2
12
18
16
What type of reaction is this?
2Al + 6HCl --> 3H2 + 2AlCl3
combustion
single replacement
decompostion
What type of reaction is this?
Pb(NO3)2 + H2S → PbS + 2HNO3
single replacement
double replacement
synthesis
boom boom pow
What are the products of all combustion reactions similar to this?
CH4 + O2
H2O and CO2
HCl and O2
fire and ice
H2 and O2
endothermic means what?
products store more energy than reactants
reactants store more energy than products
endothermic reactions
absorb energy
release energy
smell bad
exothermic reactions
absorb energy
release energy
look funny
A gas dissolves best in a liquid at low temperature and ?
High pressure
low pressure
your mom
2 particles react when they have the right energy and position is which theory
collision theory
big bang theory
theory or relativity
When the rate of evaporation equals the rate of condensation in a closed system it is said to be at ?
equilibrium
absolute zero
ground level
the zoo
H2 + Cl2 + 15 KJ <--> HCl
If you increase the temperature of this reaction, what will happen?
it will shift left
it will shift right
nothing
cheesburger
the equilibrium of an endothermic reaction will shift right if you----.
add energy
remove energy
sit on it
When the lines flattens out after 25 seconds what has happened in this reversible reaction?
equilibrium
combustion
decomposition
hot dot
According to acid base theory a base will____.
Accept an H+ ion
eat soup
lose all its energy
NaOH, KOH, and Mg(OH)2 are all bases what is their PH
above 7
below 7
7
I love you
HCl, HBr, and HSO4 are all acids, their PH will be____.
above 7
7
below 7
full of cheese
Concentration of a solution is measured in___.
M - molarity
mol - moles
g
diamonds
What is a key difference between ionic and covalent bonds?
Ionic bonds occur only in organic compounds, while covalent bonds occur in inorganic compounds.
Ionic bonds involve the sharing of electrons, while covalent bonds involve the transfer of electrons.
Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.
Covalent bonds can only form between two metals, while ionic bonds can form between a metal and a nonmetal.
The line of this graph represents the amount of energy in the system when a reaction occurs.
Which graph shows an exothermic reaction where the system loses energy?
The line of this graph represents the amount of energy in the system when a reaction occurs.
Which graph shows an endothermic reaction where the system gains energy?
What has one head, one foot, and four legs?
a bed
your dog
truck
