288 Answered Questions for the topic Chemistry Lab

10/05/18

very confusing chem question

he following reaction illustrates the decomposition of hydrogen peroxide (H2O2) to form water and oxygen gas:2 H2O2 (l) → 2 H2O (l) + O2 (g)When this reaction is carried out, 0.50 L of O2 gas is... more

10/01/18

Need help with solving this chemistry question

1a. Write a balanced equation and corresponding Ka expression for the ionization of the weak acid lactic acid(HC3H5O3, Ka=1.62x10^-4) in water b. A buffer solution is prepared by dissolving... more

10/01/18

Need help with this chemistry question

a. Find the volume of 1.0M tartaric acid, H2C4H4O6, solution that when diluted to a total volume of 250.0ml produces a solution that is 0.050M in tartaric acid.b. Find the mass of potassium... more

09/30/18

Chemistry homework help

Write a balanced metathesis equation for the reaction which takes place when the two solutions described below are combined and then determine the amount of solid product produced. 250.0 ml of... more

09/28/18

Titrating NaOH and acetic acid in vinegar

If the vinegar used in the lab had 5.89 g of acetic acid per 100. mL of vinegar, what volume (in mL) of 0.0998 M NaOH would you use to reach the endpoint of the titration?

09/26/18

Percent Yield of Alum Lab

I've recently did a lab to turn aluminum foil into alum using KOH and Sulfuric Acid.I need to find the percent yield of alum, but don't how to figure out which information I need.Here is what I... more

09/24/18

How many molecules are in 2 moles of molecules?

 How do you even do this question?

09/17/18

How to test the conductivity of liquid and solid substances?

How to test the conductivity of liquid and solid substances?

09/17/18

How to classify the resulting product?

When an ice cube melts, the product will be a glass of liquid water. If you were to dissolve sugar in the water, how would you classify the resulting product? BE SPECIFIC!

09/17/18

3 physical properties of Diet Coke

3 physical properties of Diet Coke

09/17/18

3 physical properties of an ice cube?

3 physical properties of an ice cube?

09/17/18

How to test the conductivity of liquid substances?

How to test the conductivity of liquid substances?

09/17/18

Is salt a compound, element, mechanical mixture, suspension mixture or solution mixture?

Is salt a compound, element, mechanical mixture, suspension mixture or solution mixture?

09/13/18

10 mL of 0.2 M NiSO4 is mixed with 20 mL of 0.1 M CuSO4. Calculate the molarity of Ni2+, Cu2+and SO42- ions present in solution.

10 mL of 0.2 M NiSO4 is mixed with 20 mL of 0.1 M CuSO4. Calculate the molarity of Ni2+, Cu2+and SO42- ions present in solution.

09/13/18

Calculate the molarity of a solution obtained by adding 10 mL of 0.1 M NiSO4 to 10 mL of solvent.

Calculate the molarity of a solution obtained by adding 10 mL of 0.1 M NiSO4 to 10 mL of solvent.

09/13/18

How many moles of NiSO4 are present in 10 mL of 0.1 M NiSO4?

How many moles of NiSO4 are present in 10 mL of 0.1 M NiSO4?

09/08/18

Hydrchloric acids

When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced.  CaCO3 + 2HCl = CaCl2 (aq) + H2O + CO2 A.)How many grams of calcium chloride will be... more

09/07/18

Unknown compound combustion

An unknown compound contains only C, H, and O. Combustion of 6.10 g of this compound produced 14.4 g of CO₂ and 3.92 g of H₂O. What is the empirical formula of the unknown compound?

09/07/18

Combustion Chemistry

Complete combustion of 5.90g of a hydrocarbon produced 18.1g of CO2 and 8.63g of H2O. What is the empirical formula for the hydrocarbon?

09/05/18

CHemistry lab

A beam of light is reduced to one-fourth of its initial intensity on passing through a 10 cm thick cell containing a 0.05 M (molar = moles per liter) solution. Calculate the extinction coefficient... more

09/05/18

Chemistry lab

A 0.001 M solution absorbs 10% of light passed through a cell 1 cm thick. What concentration must be used to absorb 90% of the same radiation? Answer:

09/05/18

Chemistry lab

An aqueous solution absorbs 10% of incident light passed through it. Calculate the absorbance if the same solution is placed in a cell 5 times as thick?
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