08/27/18

Enthalpy of reaction, thermochemical equations
How much energy is released when 0.40 mol C6H6(g) completely reacts with oxygen? 2C6H6(g) + 15O2(g) => 12CO2(g) + 6H2O(g) the answer is -1268 but i need help getting there
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08/27/18

The wound is located in the left inferior ,posterior lumbar region it is 5cm superior to the cultural region and 3cm lateral to the vertebral region
Where is the wound  
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08/27/18

what is the structure of glutamic acid and lysine at pH 2 and pH 11?
what is the structure of glutamic acid and lysine at pH 2 and pH 11?
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08/27/18

How to make a buffer?
So I have to make a 0.02 M Sodium Phosphate buffer @ pH of 7, easy enough I use monosodium and disodium phosphate as the acid and base, I used the henderson hasselbach equation. But now I have to... more
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08/27/18

What is the Main Energy Processing System in PLANTS?
Basically a Bioenergetic Question. Choose one of the Ans. That you think is the right one. A. PHOTOSYNTHESIS B. RESPIRATION C. MITOCHONDRIA D. BOTH A&B   THANKS FOR THE HELP!
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08/27/18

What is the Role of NADP+ in Photosynthesis?
Some options are given below, if you can help me giving an answer (telling me which option is correct). A. Assist chlorophyll in capturing light. B. As Primary Electron Acceptor C.Part of... more
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08/26/18

Assume that 51.9 inches of rain had an equal height over 530 square mile area. what was the mass of the water in kilograms?
 I know that you have to use volume and do conversions but I can't figure this problem out
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08/26/18

Rounding Significant Figures in Factor Labeling
Do you wait to round to significant figures till the last moment in Factor labeling in chemistry? I thought you always had to round sig figs whenever you did any multiplication/division, but it... more
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08/26/18

Chemistry Solution Math Problem - HELP!
A chemist needs 80 milliliters of a 50% solution but she only has 20% and 60% solutions available. Calculate how many milliliters of each should be mixed to get the desired result. How many... more
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08/26/18

How many consonants are in market?
I got a question about consonants and im confuse how that work.
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08/26/18

Combustion reaction
40% of a liquified petroleum gas is composed of propane and the rest is butane. This mixture is put into a room which has a size of 2m x 3m x 4m. How many grams of this mixture can be burned with... more
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08/26/18

Micheal bought 0.65 kg of meat. If the meat cost $8.50 a kilo, how much did Micheal pay?
the meat cost $8.50 a kilo and micheal bought 0.65. You have to figure out how much he paid
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08/25/18

A chemist prepares a solution of magnesium fluoride by measuring out 0.69 mg of magnesium fluoride into a 100.mL volumetric flask.
Calculate the concentration in mol/L of the chemist's magnesium fluoride solution.  
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08/24/18

lead ii sulphate and zinc carbonate, describe how you can separate the two compounds using dilute sulphuric vi acid and sodium carbonate solution
How to separate the above salts is my question,  the lead ii sulphate and zinc carbonate using dilute sulphuric vi acid 
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08/23/18

what is the purpose of using multiple control groups in an experiment
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08/22/18

A sample of MgCO3•3H20 (magnesium carbonate trihydrate) is heated until 40.37 grams of water are released. How many grams did the original hydrate weigh?
MgCO3•3H2O
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08/22/18

Does mixing chemicals always lead to a chemical reaction
I need help for the writing part of my chemistry lab.
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08/22/18

can genetic engineering be considered as biological control?
can genetic engineering be considered as biological control?
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08/21/18

Help my fellow classmates with this question please
A sample of refrigeration gas has a volume of 405 mL at a pressure of 1.50 atm and a temperature of 28°C.The gas was compressed into a volume of 130 mL with a pressure of 3.8 atm. What temperature... more
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08/21/18

According to Boyle's law, which of the following will occur if the pressure on a gas is increased?
1. The volume of gas will increase   2. The volume of gas will decrease   3. The amount (in moles) of gas will increase   4. The temperature of the gas will increase   5. The temperature of... more
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08/21/18

According to Charles's law, which of the following will occur if the temperature of a gas is decreased?
1. The pressure of the gas will decrease   2. The pressure of the gas will increase   3. The mass of the gas will increase   4. The volume of the gas will increase    5. The volume of the... more
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08/21/18

Which of the following will increase when the temperature of a fixed amount of gas at a constant volume is increased?
I. Pressure of the gas II. Kinetic energy of molecules  III. Space between molecules    I only    II only    I and III   I and II    II and III   I think it's I and III 
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08/21/18

The mass of a fixed quantity of gas
1. Increases when the volume increases at constant temperature   2. Decreases when the absolute temperature decreases at constant pressure   3. Increases when the volume is decreased and the... more
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08/21/18

Acetylene (C2H2, molar mass 26g/mol) can be produced by the reaction of calcium carbide with water according to the following equation:
CaC2(s) + 2H2O(l) = C2H2(g) + Ca(OH)2 (aq). If 2.0g of calcium carbide is reacted at STP, what is the volume of acetylene produced?   a) 0.076 L b) 1.7 L c) 3.4 L d) 0.85 L e) 2.0L
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08/21/18

Use the combined gas law
The pressure of a gas is decreased from 400 kPa to 200 kPa &the temperature is raised from 200 K to 300 K. The volume of the gas will:a) Decrease by halfb) Remain the samec) Increase by two... more
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