Chemistry

Answer all of theses questions and it must be submitted in 2 hours please be on time 

Note: It is recommended that you save your response as you complete each question.   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

 Your Answer:Question 1 options:Answer 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

 Your Answer:Question 2 options:Answer 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? Your Answer:Question 3 options:Answer 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] Your Answer:Question 4 options:Answer 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 5 options:Ethanol: d = 0.789 g/mLBenzene: d = 0.880 g/mLNone are correctWater: d = 0.9982 g/m

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Note: It is recommended that you save your response as you complete each question.   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

 Your Answer:Question 1 options:Answer 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

 Your Answer:Question 2 options:Answer 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? Your Answer:Question 3 options:Answer 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] Your Answer:Question 4 options:Answer 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 5 options:Ethanol: d = 0.789 g/mLBenzene: d = 0.880 g/mLNone are correctWater: d = 0.9982 g/mL

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Note: It is recommended that you save your response as you complete each question.   Question 1 (2 points)  What is the name of N2O5? Question 1 options:nitrogen oxidedinitrogen pentoxideneon oxidedineon pentoxide Question 2 (2 points)  What is the name of the compound composed of Ca and P? Question 2 options:calcium phosporuscalcium(II) phosphidecalcium phosphidecalcium phosphate Question 3 (2 points)  What is the formula for the compound composed of calcium and phosphate? Question 3 options:Ca2P3CaPO4Ca3P2Ca3(PO4)2 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 4 options:FeCFe3(CO3)2Fe2(CO3)3Fe4C3 Question 5 (2 points)Match the following acids to the correct names:  Question 5 options:123sulfuric acid123hydrosulfuric acid123sulfurous acid 1.H2SO42.H2SO33.H2S

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Note: It is recommended that you save your response as you complete each question.   Question 1 (2 points)  Cu+2 forms which color when dissolved in water? Question 1 options:blackblue-greenclearorange (copper color) 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]

 Your Answer:Question 2 options: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 3 options:At the end of step 5 the copper was not fully driedIn reaction 2, the litmus paper revealed the solution was acidicIn reaction 4, black particles were noted in the filtrateAt the end of reaction 2, the solution was a blue-green color 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]

 Your Answer:Question 4 options:Answer Question 5 (2 points)  Which of the following is NOT a good explination/indication as to the results obtained in the above question? Question 5 options:The student misread the scale and recorded a larger number than the actual mass of the recovered copperThe student recorded a smaller number than the actual mass of the initial copper At the beginning of step 3, the student did not heat the mixture long enoughAt the end of step 5 the copper was not fully dried----Note: It is recommended that you save your response as you complete each question.   Question 1 (2 points)  Once acid was added to the supplement, what was the purpose of filtering the solution? Question 1 options:To remove the aqueous impuritiesTo remove the solid impuritiesTo obtain solid calciumTo remove the calcium ion from the solutionSave Question 2 (2 points)  When sodium carbonate is added to the filtrate, fizzing occurs.  Which gas is being produced?