08/05/20

The length of a rectangle is 4 yd longer than its width. If the perimeter of the rectangle is 60 yd, find its length and width.
Length : Width :
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06/29/20

What is the difference between there, their, and they're?
These are often used incorrectly. What is the correct use of each?
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06/28/20

The density of a piece of ebony wood is 1.30g/cm3. What is the volume of 8.60Kg of this wood?
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06/07/20

Which of the following errors could cause your percent yield to be falsely high, or even over 100%?
Heating the sample too vigorously. Handling the crucible directly with your hands. Failing to completely decompose the sodium bicarbonate sample. Taking the mass of the empty crucible without the... more
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06/06/20

It is best to have a _____ percent yield and a _____ percent error. The options are HIGH and LOW.
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05/18/20

Combined gas law problems
A car tire has 65 moles of nitrogen gas (N2) and a volume of 87 liters. If the container has 776 more grams of N2 added, what will be the new volume of the tire? Hint: you need to determine convert... more
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05/15/20

If you use 13.2 moles of C3H8, how many grams of water will be produced?
C3H8 + 5 O2 4 H2O + 3 CO2
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05/14/20

Acid Base PH, POH
The pH of an aqueous solution is measured as 1.98. Calculate the [H3O^+].Calculate the [OH−].
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05/14/20

If some neon gas at 121,000 Pa were allowed to expand from 37 mL to 60 mL without changing the temperature, what pressure would the neon gas exert under these new conditions?
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05/14/20

Calculate the pOH if the [OH–] concentration is 5.9 E–1 M?

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04/29/20

A substance requires 64 J of heat to raise its temperature by 6°C. If the mass of the substance is 3.03 g, what is the specific heat of the substance?
What is the specific heat of the substance?
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04/29/20

Copper has a specific heat of 0.387 J/g*°C. How much copper is present when 379 J of energy added increases the temperature from 29.6 °C to 63.0 °C?
How much copper is present when 379 of energy added increases the temperature from 29.6 C to 63.0 C?
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04/24/20

Gas Law Chemistry
1) 25 moles of gas are contained in a 500 L container at a temperature of 100◦C. What is the pressure for this gas?
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04/24/20

Gas Law Chemistry
A child receives a balloon filled with 34 L of helium from a vendor at an amusement park. The temperature outside is 314 K. What will the volume of the balloon be when the child brings it home to... more
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04/24/20

Chem Stoichiometry
Calculate the volume in mL of solution necessary to provide 0.500 moles of solute for 1.24 M K2SO4
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04/23/20

This is general chemistry

A solution is prepared by dissolving 318.6 g sucrose (C12H22O11) in 4905 g of water. Determine the molarity of the solution
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04/23/20

How many grams of NaCl (molarmass=58g/mol) are needed to prepare 100.mL of a 0.25M NaCl solution?
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04/14/20

To how much water should 50mL of 12M hydrochloric acid be added to produce a 4M solution?
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04/01/20

Draw a complete phase diagram for water. What is unique about water that makes it different from most other substances?
 How could I daw a complete phase diagram for water. What is unique about water that makes it different from most other substances?
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