General Chemistry Answers

If the percentage yield is 1.92%, what mass of KC7H5O2 can be expected?

For which one of the following reactions is Δ_rxnH° equal to the heat of formation (Δ_fH°) of the product?

1.give the coordinates of the foci , vertices and covertices of the ellipse wih equation x²/169 + y²/25 = 1 sketch the graph and include these points

2.find the equation in standard form of the ellipse whose foci are F1(-8,0) and F2 (8,0) such that for any point on it, the sum of its distances from the foci is 20.

3. An ellipse has vertices (-10,-4) and (6,-4) and covertices (-3,-9) and (-2,1). Find its standard equation and its foci.

What is the quantum number that describe the 4d orbital?

What is the pH of a solution with [H^+] of 1.0 x 10^9M? What is its pOH? (Kw = [H^+][OH^-])

100 ml of raw water sample on titration ith N/50 H2SO4 required 12.4 ml of acid to phenolphthalein end point and 15.2 ml of the acid to methyl orange end point. Determine the types and extent of alkalinity.

5g of acetylsalicylic acid (aspirin) was obtained from 2.4g of salicylic acid. Calculate % yield, if the theoretical yield is 3.6g.

Cyanide test is for the identification of

1. Phenols

2. Amines

3. Carboxylic acids

4. Ketones

1. “Cat clays” are soils containing a high level of iron pyrite, FeS₂. Hydrogen peroxide, H₂O₂ is added to such a soil, producing sulfate as a test for cat clays. Suggest a chemical reaction involved in this test? 

Glycine can be estimated by using which method?

1. Formylation method

2. Acetylation method

3. Bromination method

4. Esterification method