294 Answered Questions for the topic Chemistry Lab

Chemistry Lab

08/28/16

A solid is placed in a graduated cylinder originally holding 25.00mL of water. The water rises to 30.62mL mark. What is the volume (in cm^3) of the solid?

A solid object is placed in a graduated cylinder originally holding 25.00mL of water. The water rises to 30.62mL mark. What is the volume (in cm^3) of the solid?
Chemistry Lab

08/23/16

how long would it take for light to reach the moon from earth

At a given point, the moon is 240,000 miles from the earth. How long does it take for light to leave a source on earth and reach the moon? Give the answer in second.(The speed of light is 2.998 x... more
Chemistry Lab Chemistry

07/19/16

Write the chemical reaction equations to correspond to the written descriptions. PLEASE HELP!

a) The formation of mercury(I) chloride precipitate from mercury(I) and chloride ions.   b) The dissolving of lead(II) chloride solid.c) The formation of the diammine silver complex ion from... more

07/14/16

Heat Capacity

A cylinder contains 250 g of Helium at 200 K. The external pressure is constant at 1 atm. The system experiences an evolution of heat and the temperature change is 55 K. Calculate q. Express your... more

07/14/16

Bomb Calorimetry Question

A 0.65 g sample of glucose (MW = 180. g/mol) is burned in a bomb calorimeter that has a heat capacity of 1.56 kJ/oC. The temperature of the calorimeter increases by 6.53oC. Calculate the molar heat... more

07/10/16

Atrazine Compound

Please look up the completed Lewis structure of atrazine and answer the following questions:    -How many atoms are sp3 hybridized?  -How many sigma bonds are in the completed Lewis structure? 
Chemistry Lab Science Chemistry Chem

07/10/16

Which of the following compounds when placed in water would produce an electrically conductive solution?

-FeSO4 -ZnBr2 -Mn(OH)2 -CsBr -CCl4   Please select all that are true! 
Chemistry Lab Chemistry

06/02/16

I need help with Chemistry...Anybody know what the differences between White sugar and Brown sugar in wine making? Like which one creates more alcohol and why?

Can you please explain in full depth? That would be very helpful!

Chemistry lab help

I'm working on a lab and I need someone to explain how to calculate some of the data. If you could give me an example for each one I don't understand I would appreciate it so I can work out the... more

05/23/16

What is the % Sn and % Cu in the sample?

You are given a piece of metal alloy that is made of tin and copper. If the density of the sample is found to be 8.59 g/mL what is the % Sn and % Cu in the sample?
Chemistry Lab

05/18/16

In the experiment 25,000 ppm (parts per million) Copper (II) Chloride in this experiment. Calculate the mass of copper(II) chloride in grams.

This is for a lab that i don't understand what to do and I would like some help please. This is a chemistry question.

05/05/16

How many grams of [Co(NH3)5H2O]Cl3 will be produced?

2 CoCl2·6H2O + 2NH4Cl + 8NH3 + H2O2 --> 2 [Co(NH3)5H2O]Cl3 + 12 H2O   When 1.00 g of CoCl2·6H2O reacts with 0.7 g of NH4Cl, 3.0 mL of 15 M NH4OH and 3.0 mL of 10.% H2O2, how many grams of... more
Chemistry Lab

05/01/16

What is the solubility of sugar and numerical value? Why did the sugar attach to the skewer?

I am making rocky candy for a lab in chemistry and have a couple of problems I am stuck on.    1. Why did the sugar leave the solution and attach to the stick?    2. What is the solubility of... more
Chemistry Lab Chemistry

04/28/16

lab report help, 53.3 g/mol is ethanol or propanol

we did a lab, i got 53.3 g/mol as the molar mass for the result, it can either be ethanol or propanol, which is better. propanol is closer, but it is a lab, so it isnt an accurate result in the... more

04/10/16

Ksp and the Common Ion Effect

I just completed a lab in which I titrated Calcium Iodate with Na2S2O3. During the titration we were told to add a starch once the liquid had turned light yellow. When we did this it became dark... more

04/10/16

2 Redox titration questions??? Please help!!! General Chemistry Lab?

Q1. Iron is often used to standardize permanganate solutions. A 0.158 g sample of pure iron wire was dissolved in dilute sulfuric acid to form a solution of iron (II) sulfate. This was titrated... more

04/10/16

Redox titration question? Determine the molarity of a solution? PLEASE HELP!!

Q1. Iron is often used to standardize permanganate solutions. A 0.158 g sample of pure iron wire was dissolved in dilute sulfuric acid to form a solution of iron (II) sulfate. This was titrated... more
Chemistry Lab Molar Mass

03/20/16

chem helo plss

starting with n=g/MM and PV=nRT, detrive the formula for molar mass
Chemistry Lab

03/19/16

What are the sources of error for the combustion of acetylene gas

 4 test tubes have been filled with different amounts of acetylene. One completly full , half full and so on. The one with less acetylene produced a complete combustion. What are the sources of... more
Chemistry Lab Chemistry Moles Equilibrium

03/16/16

How do I work out the molarity and equilibrium constant using moles of reactants?

The equation is C2H5OH(aq) + CH3CO2H(aq) ? CH3CO2C2H5(aq) + H2O(l)   Moles of ethanol: 0.0747 Moles of ethanoic acid: 0.0112   amount of ethanol used in experiment: 4cm3 amount of ethanoic... more

03/16/16

A student heats magnesium to produce magnesium oxide.

A student heats magnesium to produce magnesium oxide. the reaction is below:Mg + O2 MgOShe starts wih 3.45 grams of magnesium and produces 5.65 grams of magnesium oxide. Calculate her theoretical... more

03/16/16

A student calculates the theoretical yield of their experiment is 4.89 grams

A student calculates the theoretical yield of their experiment is 4.89 grams. After carrying out the experiment, they only produced 4.21 grams of product in the lab. Calculate the percent yield... more

03/16/16

Chemistry Problem:stoichiometry

 Al+S8 -->Al2S3-How many moles of aluminum are required to produce 56.9 grams of sulfur?-5.0 grams of aluminum sulfide is needed. How many grams of sulfur is required to make it?

03/15/16

What is the theoretical yield of CuO?

What is the theoretical yield of CuO? -Experimental yield of Copper II oxide-1.4-Equation-CuCO3.Cu(OH)2 -->CuO + CO2+H2O

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