447 Answered Questions for the topic chem
Chem Chemistry
12/13/21
Chem help please confused
I have a mixture of three gases in a flask at 25 oC. The total pressure in the flask is 26.2 psi. If my gas mixture consists of 13.2 g of CHCl3, 25.8 g of HCl, and 3.2 g of H2, what is the pressure...
more
Chem Chemistry
12/13/21
Chem help please
Gold metal can be dissolved using sodium cyanide according to the reaction below:4 Au(s) + 8 NaCN (aq) + O2(g) + 2 H2O(l) → 4 NaAu(CN)2(aq) + 4 NaOH(aq) If I added 86.7 g of Au to 750 mL of a 1.8...
more
Chem Chemistry
12/13/21
PV=nRT equation, I think?
Calcium carbide (Ca2C) reacts violently with water to make calcium hydroxide and acetylene gas (C2H2) as shown below:Ca2C (s) + H2O (l) → Ca(OH)2(aq) + C2H2(g) If 14.8 L of acetylene gas is...
more
12/10/21
what is the molarity of unknown HCL from the known NaOH concentration.
we did this titration lab and I got the following info. We used 6.8333 mL average of 0.7 molarity NaOH to neutralize 25.00 mL of HCL. what are the moles, molarity, ph the of the HCL in this lab?...
more
12/05/21
Classify each compound as saturated or unsaturated hydrocarbon
CH3CH2C≡CCH3CH3CH2CH3CH3CH=CHCH3CH3CH3a. Saturatedb. unsaturated
Chem Chemistry
12/05/21
Chemistry : Asid and bes
In an experiment, 25 cm² of 0.1 mol dm-3 sulphuric acid is needed to neutralise 25 cm³ of sodium hydroxide solution. Calculate the concentration of sodium hydroxide solution use in this experiment.
DETERMINE IF THE GIVEN QUANTUM NUMBERS ARE VALID
Determine whether the following sets of quantum numbers are valid or not. If valid, identify the atomic orbital being described and explain it briefly. Any explanations would help me a lot because...
more
Chem Chemistry
12/04/21
Coffee Cup Calorimeter Problem
In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase...
more
AP chem question
How many moles of magnesium oxide are produced by the reaction of 3.82 g of magnesium nitride with 7.73g of water?Mg3N2 + 3H2O -> 2NH3 + 3MgOa) 0.114b) 0.0378c) 0.429d) 0.0756e) 4.57can someone...
more
----------Chemistry--------
Prove that the enthalpy change of formation is equal to the total change reaction using carbon dioxide.C2H5OH + O2 ------> CO2 + H2OC2H5OH ------- ΔH= -278KJ O2 ------- ΔH= 0 ...
more
11/05/21
From the following formula of hydrophilic ointment solve for the quantities of each ingredient needed to prepare 5 lb (Avoir) of the ointment. Note: 1 lb = 454 g (avoir)
Methylparaben 0.25 gPropylparaben 0.15 gSodium lauryl sulfate 10 gPropylene glycol 120 gStearyl alcohol 250 gWhite Petrolatum 250 gPurified Water, add 1000 ga) Use Ratio & Proportion for...
more
From the following formula for a progesterone nasal spray, calculate the quantity of each ingredient needed to prepare twenty- four 15-mL containers of the spray.
Progesterone 20 mgDimethyl-b-cyclodextrin 62 mgPurif ed water, ad 1 mL
The signa of a prescription is "2 tab qid for 1 month" the patient bought 80 tablets and comes back after 15 days.
Solve for the percent compliance rate and answer up to the 2nd decimal place.
10/26/21
Find the electronegativity difference
What is the electronegativity difference of CH3OH?Carbon=2.5 Hydrogen=2.1 Oxygen=3.5a. 1.1b. 5c. 0.9d. none of the above
10/26/21
Find the molarity of this solution.
In 20.0 degree Celsius, a 0.258 m aqueous solution of C6H12O6 (glucose) has a density of 1.017 g/mL. Find the molarity of this solution.
AP chem question
A solution of 100.0 mL of 0.200 M KOH mixed with a solution of 200.0 ml of 0.150M NiSo4.a) Write the balanced chemical equation for the reaction that occursb) What precipitate forms?c) What is the...
more
chem question (redox)
How many electrons are being transferred in the reaction below when the reaction is balanced?(Cr2O4)^-2 + Cl^-3 -> Cr + Cl2
Chem Chemistry
10/20/21
Chemistry Question PLEASEEE help
A student decides to find the molar enthalpy for the reaction between phosphoric acid and calcium hydroxide. They have a 0.250 M solution of Ca(OH)2, which they will use; they can only find a 2.1 M...
more
Still looking for help? Get the right answer, fast.
Ask a question for free
Get a free answer to a quick problem.
Most questions answered within 4 hours.
OR
Find an Online Tutor Now
Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.