01/31/19

Elena runs for 28 seconds and finishes at 250 meters.What is her velocity

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01/31/19

Ok so let’s say aluminum bromide and chlorine gas react to form aluminum chloride and bromine has where does the 3 in bromide come from ???? And why does chlorine gas get a 2

I meant to put gas my bad!
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01/31/19

A monolayer containing 3.23 x 10^-6 g of oleic acid has an area of 20.0cm^2. The density of oleic acid is 0.895 g/mL. What is the thickness of the monolayer ( the length of an oleic acid molecule) ?

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01/31/19

The density of aluminum is 2.70g/mL. What will be the mass in kg if a sheet of aluminum measures 8ft by 12 ft by 0.25mm?
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01/30/19

Need Chem help--Due Tonight

What is the density of Mercury in pounds per cubic inch (lb/in3)? 1lb=454g 1in.=2.54cm. I'm unsure of the equation I should use for this problem. The equation is all I need and I can manage the... more
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01/30/19

describe how to determine the mass of Mg in the following chemical reaction Mg (s) + (excess) HCl (aq) --> H2 (g) + MgCl2 (aq)

Please do it based on the experimental measurements (related to H2 ); include all formulas in analysis in or converted to grams.
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01/30/19

if 20 grams of methane (ch4) reacts with 13 grams of oxygen, how many grams of water can be formed in this combustion reaction?
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01/30/19

Calculating Work in Chemistry
I cannot understand these math concepts, and it would be great if someone could help me understand them!A piston containing 1.5 L of gas at 1.00 atm is compressed to 1.25 L. Calculate the value for... more
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01/29/19

Chemistry and Compression of Gas
A gas is compressed 3 L while a constant external pressure of 1.2 atm is applied. What would the total change in internal energy be if 30.2 J of heat is released from the system after the compression? more
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01/29/19

Change in Initial Energy
Calculate the mass of ice (c= 2.11 J/gC) required to melt (initial temperature 0 Celsius) in a 500 gram sample of iced team (assume c= 4.184 J/g C since it is mostly water) to lower the temperature... more
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01/29/19

Why is the percentage yield of the asprin synthesised less than 100%
Why is the percentage yield of the asprin synthesised less than 100%
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01/29/19

How many grams of carbon dioxide can be absorbed by 1g of lithium hydroxide
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01/29/19

0.550 L of 0.410 M H2SO4 is mixed with 0.500 L of 0.270 M KOH. What concentration of sulfuric acid remains after neutralization?
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01/29/19

A sample obtained from the National Bureau of Standards had a calibrated weight of 20,000 g.
When a student measured the weight three times with a balance the results were: 19,603 g, 19,599 g, and 19,600 g. What conclusions may be drawn regarding the accuracy and precision of the balance... more
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01/29/19

What is the mass of the sand in the mixture?What is the mass of the salt in the mixture? What is the sand percent composition in the mixture? What is the salt percent composition in the mixture?
A 3.000 gram sample of a sand/salt mixture is separated into its individual components. The mass of the beaker alone was 105.974 grams, and the mass of the beaker plus the sand was determined to be... more
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01/29/19

A iron wire (density = 7.86 g/cm^3) has a diameter of 0.0518cm. What is the mass, in grams, of a 9.49 in length of this wire?

consider volume of a cylinder
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01/29/19

Calculate the minimum concentration of the acid-salt pair needed to buffer a solution at a pH of 4.10 when 50 mL of 0.1 M NaOH is added.

Please help this is for a titration lab that is due tomorrow!!!!!!!!!!
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01/28/19

Stoichiometry Question
C5H12+8 O2 = 5 CO2 + 6 H2O If 128 grams of oxygen react with excess propane, how many grams of water will be generated?
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01/28/19

mass of a molecule and mass of a mole - units?
question states The chemical formula for ethanol is CH3CH2OH. What is the mass for one molecule of ethanol? What about one mole of ethanol?I have found the molar mass of ethanol to be 46 when I... more
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01/28/19

If jeans where $9.95 and I have a 30% coupon how much would it be?
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01/28/19

English grammar

Is it correct to say - My hero has taken flight? Meaning he is no longer with us - dead
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01/28/19

Experiment Chromatography

In today’s experiment, some lab students let their chromatograms elute slightly longer than others. If one student’s solvent front traveled to 9.80 cm, and another student’s solvent front traveled... more
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01/28/19

A molecular biologist measures the mass of cofactor A in an average yeast cell. The mass is 24.7pg. What is the total mass in micrograms of cofactor A in a yeast colony containing 10^5 cells?

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01/27/19

A grain of sand has a mass of 0.078 mg. How many grams is this? How many pounds is this? (1 kg = 2.20 lb)

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01/27/19

It takes a fast person 9.82 seconds to run 100. meters. How long will it take for the person to run 400. yards, assuming they do not slow down?

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