03/14/17

If it takes 7.1 pounds of seed to plant one acre of grass, how many acres can be planted with 9.23 pounds of seed?
If it takes 7.1 pounds of seed to plant one acre of grass, how many acres can be planted with 9.23 pounds of seed?
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Lab

03/14/17

trying to get concentration
Use the dilution equation to calculate the molar concentration of sodium bsiulfite and potassium iodate after mixing for each th solutions.after mixing hso and after mixing io3
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03/13/17

Jasmine's dog weighs 15 kg. the dogs collar weighs 200g. How many grams does the dog weigh with its collar on?
I am confused on how to convert grams to kilograms in this problem and how it relates to the problem  
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03/12/17

should the effects of dilution on % dissociation for a weak acid be any different than % hydrolysis of a weak base undergoing dilution?
should the effects of dilution on % dissociation for a weak acid be any different than % hydrolysis of a weak base undergoing dilution?
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03/11/17

Calculate the molar mass of 10.23h of compound contains 0.2 moles.
Answer is 51.15g/mol    ps. Please show how to get the answer by using mole highway, thx!
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03/11/17

Calculate the volume of 42 kg of helium gas.
Answer is 235,200L.   ps. How do I get to the answer by using mole highway? Thx!
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03/11/17

5824 DIVIDE D BY .04%
Miles paid $5,824, including 4% sales tax, for an out-of-state purchase of a car. In order to calculate the amount of sales tax he owes in his state, he must first determine the price of the car... more
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03/11/17

The calculated and expected amount of product is the ?
the calculated and expex amount of product is the? A) actual yield , B) theoretical yield , C) excess reagent , D) limitining reagent 
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03/11/17

Define cleavage and cleavage plane
Define cleavage and cleavage plane
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03/11/17

If I contain 3.0 moles of gas in a container with a volume of 60.0 L and at a temperature of 400 K, what is the pressure inside the container?
Please help me answering this question. Show all work. Final answer must show units, and must be rounded to the correct number of significant digits.
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03/11/17

2. A student collects 625 mL of oxygen at a temperature of 24°C and a pressure of 0.899 atm. How many moles of oxygen did the student collect?
Please help me answering this question. Show all work. Final answer must show units, and must be rounded to the correct number of significant digits
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03/11/17

If I have 7.7 moles of gas at a pressure of 0.090 atm and at a temperature of 56°C, what is the volume of the container that the gas is in?
Please help me answering this question. Show all work. Final answer must show units, and must be rounded to the correct number of significant digits
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03/09/17

HARD PROBLEM
A 4.36 liter container holds a mixture of gases. The gases in the mixture are helium gas and argon gas. There are 0.27 moles of helium gas and 0.12 moles of argon gas in the gas sample and the... more
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03/08/17

Why would the reaction occur closer?
Two cotton plugs are placed simultaneously in each end of a glass tube, 12 cm in length. On one end the cotton is soaked with aqueous NH3 and on the other end the cotton is soaked with aqueous HCl.... more
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03/08/17

Which balloon would have the most volume?
If latex balloons are filled with the following gases and allowed to sit for two days, which balloon will have the most volume? Which would have the least volume? Rank them all in order of smallest... more
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03/07/17

what makes the difference in voltage output of a voltaic cell, if the chemical in the salt bridge is changed (KCl, KNO3, NaCl, NaNO3)?
The chemical is changed with KCl, KNO3, NaCl, NaNO3. So it has been found that the KCl has the most voltage output than the other chemicals. So why is that?
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02/21/17

two ebzye Xam1 and Xam2 have Kms of 34mM and 76mM repectively, which enzyme will have the higher Vmax?
A Xam1 since it has lower Km(higher affinity and higher Vmax) B Xam2 since it has higher Km(lowee affinity and higher Vmax) c we cannot tell,Vmax depends on activation energy, not Km d we cannot... more
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02/19/17

It is about chemistry
 (a) How much the weight of Na2CO3 was used to produced 50 ppm of carbonate?   (b) Why buffer 9 seldom used in analysis?
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02/18/17

Calculate the ratio of the rate of effusion of oxygen gas to that of H2 both at 27.0 Celsius
Mixtures of different gases can be separated by effusion, because the effusion rate of gases depends on the molecular mass of the gas. This process was implemented in Oak Ridge during World WarII... more
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02/16/17

Does a comma go before and
He was seen by a primary care physician who noticed he was anemic, and gave him red cell transfusions after a course of antibiotics did not improve.  
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02/16/17

Light absorbance vs absorbance confusion?
okay so on my paper i have unknown percentage light absorbance of 19, 20, and 23, and i have an equation of y=mx+b, where y is the absorbance and x is the concentration which i need to find by... more
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02/15/17

Coordination compounds related doubt
In which of the following compounds iron has lowest oxidation number? (1) FeSO4 · (NH4) 2SO4 · 6H2O (2) K4[Fe(CN)6] (3) Fe2O (4) Fe2O3
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02/15/17

If 200 grams of water is to be heated from 24 degrees to 100 degrees to make a cup of tea, how much heat must be added
If 200 grams of water is to be heated from 24 degrees to 100 degrees to make a cup of tea, how much heat must be added
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02/15/17

"Mg(s) + 2HCl(aq)=MgCl2(aq) +H2(g)
so theres like 2 parts to this question,   a. How many grams of HCl are consumed by the reaction of 5.13 moles of magnesium? b. Whatis the mass in grams of H2 gas when 1.62 moles of Hcl is added to... more
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02/15/17

What is the concentration of mercury in the aquarium water in parts per million?
The water in an aquarium was contaminated with 5 mg of mercury from a broken thermometer. The tank has a volume of 1250 L. What is the concentration of mercury in the aquarium water in parts per... more
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