Other Chemistry Answers

if 50.0 g of silicon dioxide is heated with 25.0 g of C, 28.0 g of silicon carbide and 30.0 g of CO is produced.
SiO2 + C --> SiC +CO
what is the theoretical yield and % yield for each product of this reactant?

Dissolving 3.00 g of an impure sample of calcium carbonate in hydrochloric acid produced 0.656 L
of carbon dioxide (measured at 20.0°C and 792 mmHg). Calculate the percent by mass of calcium
carbonate in the sample. State any assumptions.

1.What type of starch is suitable for production of Bio-plastics?

2.Can you suggest some articles and books to understand well about production of Bio-plastics and design of plant?

How much heat is produced by the complete combustion of 265g of CH4?
CH4(g)+2O2(g)→CO2(g)+2H2O(g)ΔH∘rxn=−802.3kJ

A company produces plastic elephants in two colours for the novelty trade market. Production in the factory is on one of three machines; 10% is on machine A, 30% on machine B, and the remainder on machine C. Machine A’s production consists of 40% blue elephants and 60% pink elephants. Machine B’s production consists of 30% blue elephants and 70% pink elephants. Machine C’s production has 80% pink elephants with the remainder being blue.
2.1.1 What proportion do blue elephants form of total production? (5)
2.1.2 If a particular elephant is pink, what is the probability it was made by machine B? (5)
2.2 You have been given the probability distributions of possible profits from two projects, A and B:

0.10 g glycine and 0.4 ml water taken in 5 ml conical vial. Warmed slightly to dissolve the glycine. 0.3 rnl acetic anhydride added and stirred for about 5 min. Mixture cooled in ice bath for 10 min. Precipitate collected by suction filtration and washed with a few ml water. Clystais spread over a piece olfiiter papel or watch glass and air dried for i0 min. Mass and melting point of product recorded. Glycine dissolved after about 20 sec when warmed in gl5 cine water mixture' White, needle-shaped crystals formed when reaction mixture cooled in ice. 0.14 g. of solid obtained after f,rltration and drying of product. mp of crystals recorded as 205-207 n Solid product possibly still slightly wet. Conclusion: crystallized material was in fact acetanilide, based on its melting point. Not highly pure. A second crystallization should produce a fairly pure material, but it would also decrease

you have a solution that is 50.0 mg/mL of glucose. if you take 0.01 L of this solution how many grams of glucose have you taken.

1. The pH of rainwater collected in a certain part of a highly industrialized area on a particular day was 4.82. What is the H+ ion concentration of the rainwater?

2. The OH- ion concentration of a blood sample is 2.5 x 10-7 M. What is the pH of the blood?


Please help me solve this problems :(

. If you dissolve 25.5 g KBr in enough water to make 1.75 L of solution, what is the molarity of the solution?

When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced.

CaCO3(s) + 2HCl(aq) ---> CaCl2(aq) + H20(l) +CO2(g)

1)How many grams of calcium chloride will be produced when 29.0 g of calcium carbonate are combined with 14.0 g of hydrochloric acid?

2)Which reactant is in excess and how many grams of this reactant will remain after the reaction is complete?