81 Answered Questions for the topic Chemistry, Homework

Chemistry, Homework

08/21/18

Calculate the molar mass of a compound if 10.05 g of a gas occupies 1.20 L at 29.2°C and 1.1 atm.
Help is appreciated! 
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Chemistry, Homework

08/21/18

Some commercial drain cleaners use a mixture of sodium hydroxide and aluminum powder.
When the solid mixture is poured into the drain and dissolves, a reaction ensues that produces hydrogen gas:2NaOH(aq) + Al(s) + 6H2O(l) → 2NaAl(OH)4(aq) + 3H2(g)   Determine the volume of... more
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Chemistry, Homework

08/21/18

A gas cylinder contains 50.0 L of the gas argon when it is full
If the cylinder was at an internal pressure of 1500 kpa and 25ºC, how many molecules of argon gas were present in the container?
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Chemistry, Homework

08/21/18

The head of a match contains the chemical diphosphorus trisulfide.
When this chemical undergoes friction it ignites and burns according to the equation given below:   P2S3(s) + 11/2 O2(g) -> P2O5(g) + 3SO2(g)   WHAT MASS OF P2S3 WOULD PRODUCE 310 ML OF... more
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Chemistry, Homework

08/20/18

When 500 mL of a gas at constant pressure is heated from 25°C and 75°C, the volume must be multiplied by
a) 25/75   b) 75/25   c) 25/75 * 298/348   d) 348/298   e) 298/348
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Chemistry, Homework

08/17/18

Write the balanced chemical equation for the reaction below (and remember to include states), and indicate the type of reaction (S, D, C, SD, DD)
Write the balanced chemical equation for chromium is added to aqueous iron (iii) chloride. Plz help 
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Chemistry, Homework

08/17/18

When excess magnesium nitrate was added to 175 mL of a solution of sodium hydroxide, a solid precipitate formed.
When excess magnesium nitrate was added to 175 mL of a solution of sodium hydroxide, a solid precipitate formed. The dry precipitate had a mass of 11.43 g. What was the concentration of hydroxide... more
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Chemistry, Homework

08/17/18

In the textile industry, chlorine is used to bleach fabrics
Any of the toxic chlorine that remains after the bleaching process is destroyed by reacting it with a sodium thiosulfate solution, Na2S2O3(aq).    Na2S2O3(aq) + 4Cl2(g) + 5H2O(l) = 2NaHSO4(aq) +... more
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Chemistry, Homework

08/17/18

A scientist isolates 4.195 g of a gas. The sample occupies a volume of 817.0 mL at 78.1°C and 99.4 kPa.
Calculate the molar mass of the gas and please show all your work!
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Chemistry, Homework

08/17/18

A compound’s molar mass is 320 g/mol. Its percentage composition is 75.00% carbon, 5.05% hydrogen, and 19.95% oxygen. What is the compound’s molecular formula?
Please show all your work! 
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Chemistry, Homework

08/17/18

Formalin is an aqueous solution that is made up by dissolving formaldehyde gas, HCHO(g), in water.
A saturated formalin solution has a concentration of about 35.92% (m/v). This concentration is used to preserve biological specimens. Calculate the molar concentration of 35.92% (m/v) formalin.... more
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Chemistry, Homework

08/17/18

Write the balanced chemical equation for the reaction below
Remember to include states, and indicate the type of reaction (S, D, C, SD, DD). Be sure to show your work.   Aqueous sodium carbonate is mixed with hydrochloric acid
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Chemistry, Homework Chemistry Chemistry Helpneeded

08/11/18

in the manufacture of potassium permanganate a solution containing manganate ion is oxidized by chlorine. Would bromine or iodine be as good?
in the manufacture of potassium permanganate a solution containing manganate ion is oxidized by chlorine. Would bromine or iodine be as good?
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Chemistry, Homework Calculus Chemistry Organic Chemistry

07/26/18

Chemistry 2 rate of reaction homework help
The decomposition of nitramide, NH2NO, is a first-order reaction.   a.) Write the rate law formula. b.) When starting with 0.105 M NH2NO2, with rate constant k = 5.2 x 10^-2 s^-1 at 15Celsius,... more
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07/20/18

Question about how significant digits work in chemistry.
I'm doing my online chemistry summer class and significant digits are included, of course. But I'm confused about them because everything I believe is being contradicted. Here's what I... more
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Chemistry, Homework Biology Chemistry Biology Tutor

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
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Chemistry, Homework Chemistry Chemistry Science

06/17/18

Chemistry HW: What is the energy value of the olive oil in kJ/g?
When a 0.560 g sample of olive oil is burned in a calorimeter, the heat released increases the temperature of 370 g of water from 22.7C to 39.1C. What is the energy value of the olive oil in... more
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Chemistry, Homework

05/16/18

which one of the following compounds is soluble in water?
A. LiCl B. AgCl C. CaSO4 D. PbCO3 E. Cu(OH)2
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Chemistry, Homework

05/16/18

For the reaction: 2 H 2 O + 137 k c a l → 2 H 2 ( g ) + O 2 ( g ) how many kcal are needed to form 100. g h2o ( g ) ?
I tried solving this and got 380. Kcal, but I wasn't sure if my answer is incorrect because I struggled with the set up of the equation at the beginning.
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05/16/18

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.
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Chemistry, Homework Chemistry Chemistry Helpneeded

05/12/18

When KCl dissolves in water...
The answer is the K+ ions are attracted to the partially negative oxygen atoms of the water molecule. My question is, is that why does it do this? Would someone be able to explain why this happens... more
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Chemistry, Homework

05/11/18

Which of the following is FALSE?
The mass of matter remains constant wherever it is located. With some exceptions, matter can be seen, smelled, and felt. Matter exists in solid, liquid, and gaseous states. The weight of matter... more
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Chemistry, Homework

05/11/18

the number of valence electrons found in an atom from the main group element is equal too
The answer is its group numver, but I wasn't sure why that is. Can someone explain that to me please.
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Chemistry, Homework

05/05/18

What mass of ammonia can be made from 20.0g of hydrogen?
3H2 + N2 = 2NH3
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Chemistry, Homework

05/01/18

combustion of coke is a combination reaction CO2 is not a pollutant. then why is combustion of coke harmful
chemistry question
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