Chemistry

Please help!!! the concentration of the stock solution? (with steps please)

A chemist in a water treatment plant requires five solutions of NaOH – a stock solution and four standard solutions. 40.00 g of NaOH are dissolved in water in a 250 mL volumetric flask to prepare the

What heat energy is required to completely boil 200 ml of pure water at 1 atmosphere of pressure

density of water at 20 °C = 1.00 g / ml Cp (water) = 75.0 J K-1 mol-1 ΔHm(vap) = 40.7 kJ mol-1 Mm (H2O) = 18 g-It depends on what the initial temperature of the water is. I am assuming that it is 20°C

Is there a techneque to reading new compounds by the way the elements from the table are moved around

To explain it better...Is there a way to know that I am looking at a certain molecule by the combination of th individual element such as carbon dioxide?-not as such but by checking the amount of prot

Some Chem help please

Can someone answer this for me please? thank you =) 1) Silver sulphide and hydrogen combine to form silver and hydrogen sulphide. 3.0 g of H2 and 100 g of Ag2S are used to produce 85.0 g of Ag. The eq

Transition metals and acid help?? 10 points

ok so i made an experiment where i put - Calcium - Magnesium - Copper - Zinc -Tin -Aluminiumseperately in test tubes and added 1M hydrochloric acid into them now calcium and magnesium reacted a l

How Much Products - Please Help!

Calculate the mas of copper sulphate when 2.5g of copper(II) oxide reacts with excess sulphuric acid. The equation for the reaction is:- - CuO + H2SO4 --> CuSO4 + H2O Ar: Cu= 63.5 O= 16 S= 32 Can

Name that organic molecule

http://quizrace.com/img/quiz2/chemical-f…-2-acetoxybenzoic acid(common name aspirin or acetylsalicylic acid)-The guy above me is right. I just dont want to retype it

Chemistry question--calculate the number of: moles, atoms, molecules, and grams

Convert 8.57 g of Ca3(PO4)2 into each of the following: a) number of moles of Ca3(PO4)2 b) number of moles of Ca c) number of Ca atoms d) number of molecules of Ca3(PO4)2 e) number of grams of P

Express 5,981,025,000 in exponential form using standard scientific or "e" notation (for example, 105 = 1.05e2

and this one too please im horrible with exponents. Express .0370700 in exponential form, using standard scientific or e notation (for example, 105 = 1.05e2). Enter the correct number of significant

Chemistry lab question

You are measuring the density of a metal that has a volume of 10ml and a mass of 20g. How would calculate the density? a. 10 ml multiplied by 20 g b. 10 ml divided by 20g c. 20 g multiplied by 10 ml

What was the concentration of the original sample?? please Help!!

A forensic chemist tests a water sample for cyanide. To do so, the sample is diluted by pipetting 1 mL into an empty 100 mL volumetric flask, which is then filled to the mark with deionized water. If

A 400-gram sample of alcohol at 15 degrees celsius is mixed with 400 grams of water at 86 degrees Celsius.

What is the final temperature of the mixture?-Please examine this link: http://www.chemteam.info/Thermochem/Mixi… for a discussion of the technique to follow. Problem #6, which uses ethanol and wate

Please tell me, What is its name

http://quizrace.com/img/quiz2/chemical-f…-jimmy.-This is hydrogen tetraoxide. This is use for oxidizing flame or to make a flame.

Whats stonger intermolecular or covalent bonds

Im revising for my gcse chemistry exam which is in 3 days :S Thanks for the help.-covalent. intermolecular is weak. Example is graphite. Each layer consists of covalent bonds, but layer is bond to an

What are the observations seen for casein + heat & for casein + alcohol

Casein as a protein obtained from milk. As such, it denatures when heating (loses its properties). The reaction with alcohol shows the same- the protein coagulates. The protein changes its structure d