48 Answered Questions for the topic Chemistry HelpNeeded

04/29/18

Chemistry: Stoichometry
Lithium metal decomposes in water and releases hydrogen gas. If 275 mL of hydrogen gas are produced at STP, what is the mass of lithium that reacted.   Li + H2O -> LiOH + H2
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04/29/18

Chemistry: Stoiciometry
A Student used 4.55 grams of salicylic acid, along with acetic anhydride, to prepare aspirin.C7H6O3 + C4H6O3 -> C9H8O4 + C2H4O2(salicylic)   (acetic an)  (aspirin)    (acetic acid)(a)Find the... more
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Chemistry Helpneeded Science Chemistry, Homework

04/25/18

What affects the atom economy
I need help with this question
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Chemistry Helpneeded

04/18/18

How many joules must be added to 10.0 grams of water to raise its temperature from 10C to 15C
C means Celsius 
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Chemistry Helpneeded Chemistry Chemistry, Homework

04/17/18

Sherry had 13.5 liters of oxygen gas measured at 25 degrees Celsius. She took that the gas outdoors where it was 10 degrees Celsius. Volume of the gas afterward
You must find the volume of the gas after she moved it outdoors. Remember volume at room temperature measures in STP... 273Kelvin...
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Chemistry Helpneeded Science Chemistry High School Chemistry

04/15/18

What causes vitamin C concentration to increase in freshly squeezed orange juice?
Hi. In year 13 Chemistry we titrated an iodine solution with freshly squeezed orange juice which had been stored at different temperatures. We keep the orange juice solution in an incubator to... more
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Chemistry Helpneeded Chemistry Chemistry Lab Chemistry Lab

04/13/18

how to reduce solution that could be trapped in the pores of the filter paper for example aspirin
I need help
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Chemistry Helpneeded Science Chemistry Chemistry Lab

04/11/18

how does impurities affect filtration and drying of aspirin
I need help with this question
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Chemistry Helpneeded Chemistry Chemistry Lab

04/11/18

describe the factors that influence purity in filtration and drying.
I need help with this question.
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04/02/18

How do you calculate rate of expansion of gas with temperature with a gradient of the line being 0.2?
i am doing a graph plotting in volume and temperature it has asked: How do you calculate rate of expansion of gas with temperature with a gradient of the line being 0.2? 
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Chemistry Helpneeded

03/24/18

please help quickly!
 if the previously shown begins with 5.6 miles of 02 and 0.98 moles of C2H6 determine the limiting reactant, the excess reactant, in the maximum number of grams of H2O that can be formed.    the... more
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Chemistry Helpneeded

03/24/18

Urgent Chemistry Question
If the previously shown reaction  begins with 76 g of 02 and 43 g of C2H6 identify the limiting reactant, the excess reactant, in the maximum number of grams of CO2 that can be formed. How many... more
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Chemistry Helpneeded Chemistry

03/06/18

How can I write balanced equations for the reactions between the following:Aluminum and sulfuric acid. Calcium carbonate and hydrobromic acid
THANKSSS PLS reply asap
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02/25/18

Calculate the theoretical yield of salicylic acid when you start with 2.7 grams of methyl salicylate and an excess of sodium hydroxide. Assume complete conversi
Chemistry Help please!
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Chemistry Helpneeded

02/21/18

is the molecule SCl2 ionic, polar, or nonpolar?
i calculated the electronegativity and got 3.5 so that is suppose to be ionic, right? not sure, thank you!!!  
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02/12/18

During the experiment, you recover 2.8 mg of Fe by testing 100 mg of powder.
Assume a full pill weighs 300 mg and contains 27.0 mg of Fe. What is the % recovery for your experiment? In other words, what percentage of the total Fe in the pill did you recover?
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Chemistry Helpneeded Chemistry

02/01/18

How do you do ionic bonding
Will the atom gain or lose electrons? Elember being k and CO
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Chemistry Helpneeded

01/31/18

What is teh mass of the liquid in kg if the volume is 2.41 pints and the density is 7.28g/mL. Express the mass in kg
Last question
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Chemistry Helpneeded

01/16/18

Lead (II) chloride
write balance reactions (showing states) for the dissociation of the following solidsL 1: Lead (II) chloride  
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Chemistry Helpneeded

01/09/18

Given the following equation, determine the amount of HCl (in grams) that is produced with 90.0 g FeCl3. 2 FeCl3 + 3 H2S → 6 HCl + Fe2S3
show all work
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Chemistry Helpneeded

01/09/18

In the thermite reaction, iron (III) oxide (Fe2O3) reacts with aluminum metal (Al) to form aluminum oxide (Al2O3) and iron metal (Fe). Find the ratio of iron (I
show the steps 
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Chemistry Helpneeded

01/03/18

Chemistry help.
A rock weighing 30.0 g is placed in a graduated cylinder displacing the volume from 22.3 mL to 27.6 mL. what is the density of the rock in grams/cubic centimeter?   D=M/V M=DxV V=M/D
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Chemistry Helpneeded

12/11/17

A sample of SO2 gas has a volume of 1.16 L at a temperature of 23° C. At what temperature will the gas have a volume of 1.25 L ?
Chemistry problem  Formula: (Gay-Lussacs Law) P1/T1=P2/T2
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