Answer all of theses questions and it must be submitted in 2 hours please be on time  Question 1 (2 points) What is the density of a block of unknown material with a mass of 11.90-g if the dimensions are:  length = 2.2 cm height = 1.7 cm width = 7.5 cm Question 2 (2 points) What is the density of a 16.97-g object if the dimensions of the block are: length = 12.6 mm height = 6.8 cm width = 0.014 m Question 3 (2 points) What is the density of a 21.73-g irregularly shaped object if the initial volume of water was 23.4-mL and the volume rose to 56.0-mL after the object was added? Question 4 (2 points) A volume of water was delivered using a buret and experimentally determined to have a mass of 2.44-g.  What was the final volume of water on the buret if the inital was 0.17-mL? [assume the density of water is 1.00g/mL] Question 5 (2 points) Identify the following chemical using the information provided below: initial buret reading: 1.2-mL final buret reading: 10.5-mL mass: 8.184-g ------ Question 1 (2 points) What is the density of a block of unknown material with a mass of 11.90-g if the dimensions are:  length = 2.2 cm height = 1.7 cm width = 7.5 cm Question 2 (2 points) What is the density of a 16.97-g object if the dimensions of the block are: length = 12.6 mm height = 6.8 cm width = 0.014 m Question 3 (2 points) What is the density of a 21.73-g irregularly shaped object if the initial volume of water was 23.4-mL and the volume rose to 56.0-mL after the object was added? Question 4 (2 points) A volume of water was delivered using a buret and experimentally determined to have a mass of 2.44-g.  What was the final volume of water on the buret if the inital was 0.17-mL? [assume the density of water is 1.00g/mL] Question 5 (2 points) Identify the following chemical using the information provided below: initial buret reading: 1.2-mL final buret reading: 10.5-mL mass: 8.184-g -------- Question 1 (2 points) What is the name of N2O5? Question 2 (2 points) What is the name of the compound composed of Ca and P? Question 3 (2 points) What is the formula for the compound composed of calcium and phosphate? Question 4 (2 points) What is the name of the compound composed of iron and carbonate? [Hint: iron has a +3 charge in this compound] Question 5 (2 points) Match the following acids to the correct names: sulfuric acid hydrosulfuric acid sulfurous acid H2SO4 H2SO3 H2S ---- Question 1 (2 points) Cu+2 forms which color when dissolved in water? Question 2 (2 points) Calculate the percent recovery of copper if: 1.5-g is the initial amount and 1.2-g is the amount recovered. [Hint: do not include the percentage sign when typing in your answer] Question 3 (2 points) Which of the following is NOT a good explination/indication as to the results obtained in the above question? Question 4 (2 points) Calculate the percent recovery of copper if: 7.6-g is the initial amo.

1. Answer all of theses questions and it must be submitted in 2
hours please be on time
Question 1
(2 points)
What is the density of a block of unknown material with a mass
of 11.90-g if the dimensions are:
length = 2.2 cm
height = 1.7 cm
width = 7.5 cm
Question 2
(2 points)
What is the density of a 16.97-g object if the dimensions of the
block are:
length = 12.6 mm
height = 6.8 cm
width = 0.014 m
Question 3
(2 points)
What is the density of a 21.73-g irregularly shaped object if the

2. initial volume of water was 23.4-mL and the volume rose to
56.0-mL after the object was added?
Question 4
(2 points)
A volume of water was delivered using a buret and
experimentally determined to have a mass of 2.44-g. What was
the final volume of water on the buret if the inital was 0.17-mL?
[assume the density of water is 1.00g/mL]
Question 5
(2 points)
Identify the following chemical using the information provided
below:
initial buret reading: 1.2-mL
final buret reading: 10.5-mL
mass: 8.184-g
------
Question 1
(2 points)
What is the density of a block of unknown material with a mass

3. of 11.90-g if the dimensions are:
length = 2.2 cm
height = 1.7 cm
width = 7.5 cm
Question 2
(2 points)
What is the density of a 16.97-g object if the dimensions of the
block are:
length = 12.6 mm
height = 6.8 cm
width = 0.014 m
Question 3
(2 points)
What is the density of a 21.73-g irregularly shaped object if the
initial volume of water was 23.4-mL and the volume rose to
56.0-mL after the object was added?
Question 4
(2 points)
A volume of water was delivered using a buret and
experimentally determined to have a mass of 2.44-g. What was
the final volume of water on the buret if the inital was 0.17-mL?

4. [assume the density of water is 1.00g/mL]
Question 5
(2 points)
Identify the following chemical using the information provided
below:
initial buret reading: 1.2-mL
final buret reading: 10.5-mL
mass: 8.184-g
--------
Question 1
(2 points)
What is the name of N2O5?
Question 2
(2 points)
What is the name of the compound composed of Ca and P?
Question 3

5. (2 points)
What is the formula for the compound composed of calcium and
phosphate?
Question 4
(2 points)
What is the name of the compound composed of iron and
carbonate? [Hint: iron has a +3 charge in this compound]
Question 5
(2 points)
Match the following acids to the correct names:
sulfuric acid
hydrosulfuric acid
sulfurous acid
H2SO4
H2SO3
H2S
----
Question 1
(2 points)

6. Cu+2 forms which color when dissolved in water?
Question 2
(2 points)
Calculate the percent recovery of copper if: 1.5-g is the initial
amount and 1.2-g is the amount recovered.
[Hint: do not include the percentage sign when typing in your
answer]
Question 3
(2 points)
Which of the following is NOT a good explination/indication as
to the results obtained in the above question?
Question 4
(2 points)
Calculate the percent recovery of copper if: 7.6-g is the initial
amount and 9.5-g is the amount recovered.
[Hint: do not include the percentage sign when typing in your
answer]

7. Question 5
(2 points)
Which of the following is NOT a good explination/indication as
to the results obtained in the above question?
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Question 1
(2 points)
Once acid was added to the supplement, what was the purpose
of filtering the solution?
Save
Question 2
(2 points)
When sodium carbonate is added to the filtrate, fizzing occurs.
Which gas is being produced?
Question 3
(2 points)
What was the purpose of heating the calcium carbonate

8. precipitate?
Question 4
(2 points)
How many milligrams of calcium is in 1.46-g of calcium
carbonate?
Question 5
(2 points)
What is the percent mass of calcium in a calcium supplement if
1.34-g of calcium carbonate is extracted from a 2.80-g pill?
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Quiz
Question 1
(2 points)
How much heat is lost by 5 grams of a metal if the temperature
changed from 90c to 40c? (c=3.95 J/gK)
Save
Question 2

9. (2 points)
Assume a piece of hot metal is added to a colorimeter
containing 50mL of water at 22C. The amount of heat released
by the metal was determined to be 1000 J, and the equilibrium
temperature in the calorimeter was 26C. Remembering that the
specific heat of water is 4.18 J/gC, how much heat in joiles does
the clorimeter gain?
Save
Question 3
(2 points)
Assume the heat absorbed by the calorimeter was 200 J. What is
the calorimeter constant (Heat Capacity) if the temperature
changed from 22C to 26C?
Save
Question 4
(1 point)
Calculate the Calorimeter Constant if 25 g of water at 58C was
added to 25 g of water at 25C with a resulting temperature of
35C?
Save
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10. Question 1
(2 points)
What is the definition of the Enthalpy of Reaction?
Save
Question 2
(2 points)
Which of the following reactions needs to be reversed to solve
for the Heat of Neutralization between Hydrochloric Acid and
Ammonia?
Save
Question 3
(2 points)
What is the molar heat of neutralization (Enthalpy of Reaction)
in kJ/mol if 5 moles of HA neutralized 5 moles of BOH and
released 11123 J of heat?
Save
Question 4
(2 points)

11. Calculate the molar heat of neutralization in kJ/mol of the
reaction between HA and BOH given the following information:
The temperature change equals 5C,
50 mL of 1 M concentration of Acid
50 mL of 1 M concentration of Base
Heat capacity of the calorimeter is 6.5 J/C.
Remember that the specific heat of water is 4.18 J/gC
Save
Question 5
(2 points)
How much heat is gained (in Joules) by the water where a
chemical reaction takes place in 100 mL aqueous solution and
has a temperature increase of 12 C?
Save
----
Question 1
(2 points)
What is the definition of the Enthalpy of Reaction?
Save

12. Question 2
(2 points)
Which of the following reactions needs to be reversed to solve
for the Heat of Neutralization between Hydrochloric Acid and
Ammonia?
Save
Question 3
(2 points)
What is the molar heat of neutralization (Enthalpy of Reaction)
in kJ/mol if 5 moles of HA neutralized 5 moles of BOH and
released 11123 J of heat?
Save
Question 4
(2 points)
Calculate the molar heat of neutralization in kJ/mol of the
reaction between HA and BOH given the following information:
The temperature change equals 5C,
50 mL of 1 M concentration of Acid
50 mL of 1 M concentration of Base
Heat capacity of the calorimeter is 6.5 J/C.
Remember that the specific heat of water is 4.18 J/gC

13. Save
Question 5
(2 points)
How much heat is gained (in Joules) by the water where a
chemical reaction takes place in 100 mL aqueous solution and
has a temperature increase of 12 C?
Save
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Question 1
(2 points)
What is the wavelength of light (in nm) if the frequency is 6.2 x
10^14 (1/sec)?
Save
Question 2
(2 points)
What is the wavelength of light (in nm) if the energy of the
wave is 1.87 x 10^-19 J?

14. Save
Question 3
(2 points)
What is the final concentration of a solution if 106-mL of a 3.3-
M solution was diluted to 487-mL?
Save
Question 4
(2 points)
What is the final concentration of a solution if 15-mL of a 2.0-
M solution was diluted to 100-mL and this process was repeated
two more times?
Save
Question 5
(2 points)
Using the attached chart, find the concentration of a solution if
the absorption was 0.27.
Save
----

15. Question 1
(2 points)
How many lone pairs of electrons are there on the central atom
in ammonia (NH3)?
Save
Question 2
(2 points)
What is the electronic geometry of PCl5?
Save
Question 3
(2 points)
What is the molecural geometry of NH3?
Save
Question 4
(2 points)
What is the orbital hybridization of the central atom S in SF4?

16. Question 5
(2 points)
Is S=C=O a polar molecule?
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A sample of gas occupies 27 L under a pressure of 1.3 atm.
What would the resulting valume be if the pressure were
increased to 3.9 atm if the temperature did not change?
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A sample of CO2 occupies 200 ml at 373 K. At what
temperature (in K) would it occupy 300 ml if the pressure did
not change?
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A sample of Helium occupies 200 L at 30ºC under a pressure of
855 torr. What is the volume it occupies at standard temprature
and pressure (STP)?
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Nitric acid, a very important industrial chemical, is made by
dissolving the gas nitrogen dioxide (NO2) in water. Calculate
the moles of gas produced in 2 L volume container, 762 torr and
50 ºC if the gas behaves as ideal:
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An unknown amount of sodium bicarbonate reacts with excess
hydrochloric acid in a gas producing reaction. The reaction
vessel has the same set-up as that in lab. Paying attention to the
partial pressures of water in your lab book, if 119-mL of salt

17. water was collected in the beaker at 23C and 765mmHg, how
many grams of sodium bicarbonate did one begin with?
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Should be submitted in less than two hours