305 Answered Questions for the topic Chemistry Lab

Chemistry Lab Chemistry Elements

09/28/16

Calculate the number of grams of each element...

Calculate the number of grams of each element in 100 g of phenolphthalein if the compound is 75.46% C, 4.43% H, and 20.10% O by mass. Convert each to moles.

09/22/16

Why doesn't NaCl and HCl have the same effect on an equilibrium reaction

Recently in my AP Chem class we did a simple reaction demonstrating equilibrium: [Co(H2O)6]2+(aq)(pink) + 4Cl-(aq) <--> [CoCl4]2-(aq)(blue) + 6H2O(l) (in an ethanol solution). The reaction... more

09/16/16

what state of matter would you expect fluorine to be at -200 degrees Celsius

what state of matter would you expect fluorine to be at -200 degrees Celsius?

why is the temperature constant when a pure substance melts and freezes?

why is the temperature constant when a pure substance melts and freezes?
Chemistry Lab Chemistry

09/05/16

Phenol is the active ingredient in some throat sparys.

It is a solid, soluble in water, and it naturally sublimes at room temperature.   a) What is one way you could separate phenol from salt?   b) What is one way you could separate phenol from sand?

09/05/16

Chemistry Conversion

Convert 354.2 milliliters to quarts, given 1,000 milliliters = 1 liter and 1 quart = 0.94 liter

09/05/16

Chemistry Conversions

A) Convert grams to pounds by converting grams to kilograms and then kilograms to pounds. Then solve:   35.4 g/1 X 1 kg/1000 g X 2.2 lb/1 kg     Solve:   B)1,324,000 ug/1 X 1 kg/10^6 ug

08/30/16

Intro Biology Question regarding water (chemistry related)? PLEASE HELP!

Which statements about water and 'anti-water' (something that is the opposite of water in terms of molecular properties) should be true? Select one:a. Lubricants such as engine oil must work... more
Chemistry Lab Chemistry

08/30/16

. The normal audible threshold for sound pressure is 20 micropascals. If you play the child a pure tone at 1.58 X 10^-4 bells of sound pressure,child detect so

The end of the question is will the child detect the sound?  SHOW ALL WORK!  Use the conversion factor 1Pa (Pascals)= 94 dB (decibels) 
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

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