294 Answered Questions for the topic Chemistry Lab

03/14/16

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

03/11/16

Stoichiometry Lab

CuCO3.Cu(OH)2--> CO2+H2O+2CuO How many grams of Copper II oxide are produced if you start with 1.01 g of Copper II carbonate.

03/10/16

Stoichiometry Problem

C2H4 + O2 → CO2 + H2O -If you start with 45 grams of ethylene (C2H4), how many grams of carbon dioxide should be produced?-Theoretically, how many liters of carbon dioxide will you produce if 55.3... more
Chemistry Lab Chemistry

03/09/16

If you need to prepare 5 g of sodium chloride how many mililiters of 2 M hydrochloric acid do you need to measure?

This is the formula : NaHCO3 + HCl = NaCl + CO2 + H2O
Chemistry Lab Chemistry Moles Liters

03/05/16

If I wanted to dilute a 6.2 L, 3M NaNO3 solution to make a 4.7M NaNO3 solution....

How many L of NaNO3 would I need to add?
Chemistry Lab

03/04/16

Empirical formula question

Please help me, thank you.   Magnesium ions have a charge of +2 while oxygen ions have a charge of -2. Considering these charges, what is the empirical formula of magnesium oxide ?
Chemistry Lab Chemistry Percentages Mass

03/02/16

Separating mixtures in chemistry lab (PLEASE HELP. URGENT!)

You are to separate the two components of a mixture of sand and sugar. The initial mass of the mixture is 32.4563g. You found that the mass of sand was 19.5642g.    A) Describe the procedure you... more
Chemistry Lab

02/24/16

4NH3+5O2->4NO+6H2O

If the results from the lab actually produced 9.2 grams of H2O, then what was the percent yield?
Chemistry Lab Chemistry

02/22/16

How many grams of CuSO4*5H20 are needed to prepare a 0.020 M stock solution?

I'm in General Chemistry in college and just need the answer to this question. It'd be really cool if you could show/explain how to do this if you can. That would be a huge help. Thanks for your time. more
Chemistry Lab

02/19/16

Substances and their changes

When natural gas is burned in the laboratory burner, does the gas undergo a physical change or does it undergo a chemical change? Explain
Chemistry Lab Chemistry Mass Gold Density

02/18/16

Gold Density Question. IMPORTANT! NEED BY TOMORROW

A "pure gold" bracelet has a mass of 105.36 grams. When placed in a graduated cylinder which you read to contain 25.5 mL of water, the water level rises to read 32.0 mL. Find the density of pure... more
Chemistry Lab Math Mass Kilograms

02/17/16

Specific Gravity/Mass PLEASE HELP URGENTTTT!!

The specific gravity of blood at 20 degrees Celsius is given as 1.028. Determine the mass of 1.50 litres of blood in grams and kilograms

What does a double-headed arrow mean in a chemical equation?? PLEASE HELP!!! I AM LOST?

I am doing a lab where the chemical reaction is Fe^+3 (aq) + NCS^-1 (aq)<---      FeNCS^+2 (aq)                                                                                                  ... more

skeletal equation of carboxylic reactions

Write a skeletal equation for the reaction of ethanoyl chloride with phenyl amine (represented as R-NH2). What is the chemical term for the bond formed between the two reagents? What term might... more
Chemistry Lab Chemistry Specific Gravity

02/03/16

What is the weight in grams of 300 mL of alchohol with a specific gravity of 0.8?

CHemistry problem dealing with specific gravity. 

01/20/16

CHEMISTRY PLEASE HELP!!!!!!! Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal viole...

Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal violet with 2.0 mL of 0.100 M NaOH and 4.0 mL of distilled water.    I am so so so... more

CHEMISTRY PLEASE HELP!!!!!!! Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal viole...

Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal violet with 2.0 mL of 0.100 M NaOH and 4.0 mL of distilled water.    I am so so so... more

Chemistry lab question? Making a solution??? Please help!!

Starting with solid sodium chloride, how would you make one liter of 2.000 ppm (parts per million) sodium chloride solution?   tip: 1 ppm = 1 g solute/10^6 g solution , for dilute aq solutions 1... more
Chemistry Lab Analytical Lab

12/21/15

why should AgCl be washed with dilute HNO3 in gravimetric analysis

why should AgCl be washed with dilute HNO3 in gravimetric analysis          
Chemistry Lab Science Chemistry Moles

12/20/15

how many grams of sugar would you need to have the same number of particles as 5.0 grams of salt?

I'm having a hard time with my chemistry lab, please help!
Chemistry Lab

12/17/15

what candy requires more base per gram of candy, sweet tarts or smarties? Explain why Which candy requires more acid per gram of candy? Explain why

what candy requires more base per gram of candy, sweet tarts or smarties? Explain why Which candy requires more acid per gram of candy? Explain why
Chemistry Lab

12/14/15

Pre-laboratory excercises

The thermol decompostion of calcium carbonate produces two by-products, calcium oxide (also known as quicklime) and carbon dioxide. Calculate the volume of carbon dioxide produced at STP from the... more

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