Search & Filtering
A student wants to measure the density of the unknown material using the displacement method.
He put 8.4 g of unknown material into the water initially at 45.4 ml, and the water level rose to 48.5 mL. What should be the correct density (g/cm3)of the unknown material from the following?
Urea (CH4N2O) is a common fertilizer that can be synthesized by the reaction of ammonia (NH3) with carbon dioxide as follows: 2NH3(aq)+CO2(aq)→CH4N2O(aq)+H2O(l) In an industrial synthesis of urea, a chemist combines 138.7 kg of ammonia with 211.4 kg of carbon dioxide and obtains 167.4 kg of urea.
Determine the theoretical yield of urea
Express your answer using four significant figures.
Nitrogen and hydrogen gas react to form ammonia according to the reaction: N2(g)+3H2(g)→2NH3(g)
What is the limiting reactant?
Express your answer as a chemical formula.
Which reactant is in excess?
Express your answer as a chemical formula
. If the nitrogen atom had electronic configuration 1s7 , it would have energy lower than that of the normal ground state configuration 1s2 2s2 2p3 , because the electrons would be closer to the nucleus. Yet 1s7 is not observed. It violates (A) Heisenberg’s uncertainty principle (B) Hund’s rule (C) Pauli exclusion principle (D) Aufbau rule
You carefully weigh out 19.00 g of CaCO3 powder and add it to 76.95 g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 88.16 g . The relevant equation is CaCO3(s)+2HCl(aq)→H2O(l)+CO2(g)+CaCl2(aq). Assuming no other reactions take place, what mass of CO2 was produced in this reaction?
Express your answer to three significant figures and include the appropriate units.
A student wants to measure the density of the unknown material using the displacement method.
He put 8.4 g of unknown material into the water initially at 45.4 ml, and the water level rose to 48.5 mL. What should be the correct density (g/cm3)of the unknown material from the following?
During the practical class you used 1.0 ml of 1% v/v triton X-100 in your experiment in a final volume of 3 ml of the reaction mixture.
The final concentration of triton x-100 in the reaction mixture was [a] % v/v
Note: Type your answer with 1 significant figure. If needed the molecular weight of Triton X-100 = 647 g/mol.
Maria Christina Falls is a Plantita she makes sure that all her plants are well hydrated. One hot afternoon Christina noticed that one of her plants seems so dry and needs to be hydrated, so she decided to water that plant. However, later that she has noticed that the leaves of the plant she watered was wilted, and the plant eventually died. Now, what do you think is the cause of the plant death. Look closely in molecular level to identify and explain the reasons as to why it happens to Christina’s plant.
Limit the answer to 200 words per item.
Natural way of food preservation has been part of the Filipino cuisine and food culture, this enables Filipino families to store food for future consumption and for “flavor enhancement”. However, since these preservation methods are done naturally (without preservative) the tendency of food spoilage is very high, and this has been a big concern in Natural Food Preservation. Now as a Filipino student, what proposition would you suggest in fixing this concern? And Which concept in General Chemistry II can be best applied to understand this phenomenon?
Limit the answer to 200 words per item.
Use the data from the first video to complete this report.
A. Schematic Diagram
B. Chemical Equations involved in the reaction
1. Reaction of hydrochloric acid with Calcium carbonate in eggshell
2. reaction of NaOH with excess HCl
C. Data and Results
[HCl] = ______________
[NaOH]= ____________
Answers with calculation:
Mass of Ground Eggshell sample
Volume of HCl added
Moles of HCl used in titration (initial)
NaOH, Initial buret reading
NaOH, final buret reading
Volume of NaOH used
Moles of NaOH used to react with HCl
Moles of HCl used to react with NaOH (excess)
Moles of HCl used to react with CaCO3 in eggshell
Moles of CaCO3 reacted with HCl
Mass of CaCO3 reacted in grams
Percentage of CaCO3 in eggshell sample
this is the youtube link https://youtu.be/QY4UvtM_xRE
