294 Answered Questions for the topic Chemistry Lab

Chemistry Lab

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?

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?
Chemistry Lab

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
Chemistry Lab

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:
Chemistry Lab

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?
Chemistry Lab

09/05/18

Chemistry lab

The molar extinction coefficient of a complex of iron is 12,000 L mol-1 cm-1 with minimum detectable absorbance 0.01. What is the minimum concentration needed for minimum detection in a cell of... more
Chemistry Lab

09/03/18

If a student reacts 4.40 mL of acetic acid with 3.35 mL of isopentyl alcohol and obtains 3.25 mL of isopentyl acetate as the product, what was the percent yield

Isopentyl acetate can be prepared by an esterification reaction using acetic acid and isopentyl alcohol. The balanced reaction is shown below. (Acetic acid has MW of 60.0 g/mol & density of... more
Chemistry Lab

09/03/18

A student prepares benzoic acid by hydrolyzing 6.47 g of methyl benzoate (FW 136.15 g/mol) using excess sodium hydroxide. If the student recovers 3.71 g of benz

Ig the student recovers 3.71 g of benzoic acid (FW 122.12 g/mol), what was the percent yield of the reaction?
Chemistry Lab

09/03/18

Calculate the theoretical yield (in grams of acetic acid, FW 60.05 g/mol) if 8.79 mL of acetic anhydride (FW 102.09 g/mol, density 1.08 g/mL) is used.

When acetic anhydride is dissolved in water, it forms acetic acid according to the balanced chemical reaction shown below. Calculate the theoretical yield (in grams of acetic acid, FW 60.05 g/mol)... more
Chemistry Lab Chemistry Enthalpy

08/26/18

What are the answers to these Enthalpy questions? I need to check my them homework please

1.H2O(l) H2O(g)2.2 SO2 (g) + O2 (g) 2 SO3 (g)3.SO3 (g) + H2O(l) H2SO4 (l)4.2 HI(g) H2 (g) + I2 (s)5.4 NH3 (g) + 5 O2 (g) 4 NO(g) + 6 H2O(l)6.CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O(g)7.CH4 (g) + 2 O2... more
Chemistry Lab

08/22/18

Does mixing chemicals always lead to a chemical reaction

I need help for the writing part of my chemistry lab.
Chemistry Lab

08/14/18

a sheet of copper had a volume of 0.947mL. Use the density of copper (8.95g/mL) as a unit of conversion to calculate the mass of the copper.

 about the conversions between volume and mass 
Chemistry Lab

07/29/18

What would happen to the formation constant?

How would the formation constant for [Cd(NH3)4 2+] be affected (increase, decrease, or no change) if not all of the CdC2O4 precipitate reacted with NH3? Justify your answer.
Chemistry Lab Chemistry

07/08/18

How does burning a compound compare to it's reading in a spectrophotometer?

for example, burning copper chloride, and also analyzing it in solution in a spectrophotometer.

07/03/18

what can i say for the conclusion armspan vs height with the 0.98 positive correlation coefficient

I need help with this question

Aspirin Synthesis Lab - What chemicals are present in each step?

Aspirin is prepared from salicylic acid via an esterification reaction, which involves forming an ester (ASA) from an alcohol (salicylic acid) and carboxylic acid derivative (acetic anhydride), in... more
Chemistry Lab Chemistry Concentration

06/13/18

Using mole ratio to determine concentration of a reactant?

S2O82- + 2 I- --> 2 SO42- + I2   (reaction 1)       [I-]=0.20M, [S2O82-]=0.10M      2 S2O32- + I2 --> S4O62- + 2 I-  (reaction 2)      [S2O32-]= 0.0050M   I need to determine the... more

05/30/18

Is the reaction rate dependent on the concentration of the excess reagent?

If a higher concentration means a higher rate of reaction because of more collisions, then does the reaction rate depend on the concentration of the excess reagent? 

write chemical, complete ionic and net ionic equations for the reaction between CaCl2 and NaCO3

I cannot figure it out, although i think that it has something to do with a double replacement reaction.
Chemistry Lab

05/11/18

How many moles of CaCl2 are in a solution of prepared by diluting 250 mL of a 3.0 M of CaCl2 to 750 mL?

I tried to use the fomrula M1V1=M2V2. but still had a hard time getting to the answer of 0.75 mole.

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