02/13/19

2KClO3 —> 2KCl + 3O2
how many moles of O2 are produced from 19 moles of KClO3
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02/13/19

do crocodiles have rounded snouts
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02/13/19

Include all the quantities required, concisely describe how you would make 50mL of a 0.5% (w/v) solution of BSA (molecular weight: 66 400) using water as a diluent
Include all the quantities required, concisely describe how you would make 50mL of a 0.5% (w/v) solution of BSA (molecular weight: 66 400) using water as a diluent
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02/13/19

Predicting the concentration without doing any calculations

I’m very confused on this question.5 marksYou and Noel, your lab partner, had used the Beer-Lambert Law to calculate the concentration of light-absorbing solute, knowing its molar extinction... more
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02/13/19

how many milliliters of pure acid do I need to add to 15ml of 50% acid to make 85% acid solution
how many milliliters of pure acid so i need to add to 15ml of 50% acid to make 85% acid solution
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02/13/19

An ideal gas with an initial volume of 4.07 L is cooled at constant pressure to 25.0 °C where its final volume is 3.41 L. What was the temperature initially (in degrees Celsius)?

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02/13/19

A second-order reaction has a rate constant k of 0.004501(M s). If the initial concentration is 1.50 M, what is the concentration after 2.00 minutes?

A second-order reaction has a rate constant k of 0.004501(M s). If the initial concentration is 1.50 M, what is the concentration after 2.00 minutes? 
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02/13/19

Radioactivity Half-life Problem

If an original sample of ^91 Mo contains 2.97 x 10^22 atoms, how many atoms will remain after 62 minutes? The half life of ^91 Mo is 15.5 minutes.
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02/13/19

Radioactivity Half-life Problems

Selenium - 75 has a half life of 120.0 days. How much of an 8.00 g sample of ^75 Se will remain after.
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02/13/19

Radioactivity Half-life Problem
Cobalt - 60 has a half life of 5.26 years. If 1.00 g of ^60 Co was allowed to decay, how much would be left after.
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02/13/19

Chemistry conversion HELP please
Diesel fuel has a density if 0.839g/mL. What is the volume, in gallons, of 2.3kg of diesel? (1 gallon=3.79 L)
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02/12/19

why do you have to take that extra step and cant use the formula M1xV1=M2+V2?
Someone posted this but i still dont understand why you cant use the M1xV1=M2xV2 formula :(Question #1If 23.67 mL of a solution of Ba(OH)2 requires 15.05 mL of a 1.082 M solution of HNO3 for... more
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02/12/19

25 L of gas at 0.15 ATM and 50°C returns to standard conditions. What is the new volume
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02/12/19

College Chemistry question, I cant seem to work out the problem

Methylene chloride has a melting point of-94.8°C, a boiling point of 40.0°C, specific heat of 1.21 J/g*K for the solid and liquid, and 0.608 J/g*K for the gas. The heats of fushion and vaporization... more
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02/12/19

What are two elements that should exhibit properties of metalloids
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02/12/19

1.3 grams of h3po4 is reacted with 4.5 grams of bacl2. if 1.2 grams of ba3(po4)2 is formed, what is the perceng yield of this reaction
2H3PO4 + 3BaCl2 -> Ba3(PO4)2 + 6HCl
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02/12/19

“Any process used to ask and answer testable questions about observations of the natural world” defines which term?
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02/12/19

Determination of Reaction Rate for the Iodination of Acetone
If NaI is added to the reaction, what effect will this have on the reaction?
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02/12/19

is ther any phytochemical test to detect the presence of xanthone in my mango extract without using HPLC?
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02/12/19

How do i find the molar ratios for C4H10/O2
What is the molar ratio for C4H10/O2
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02/11/19

Find the Unknown Concentration of an Unknown Acid
A total of 25.0 mL of 0.150 M potassium hydroxide (KOH) was required to neutralize 15.0 mL of sulfuric acid (H2SO4) of unknown concentration. Balanced Equation as well please.
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02/11/19

Why don’t the Nobel gases on the periodic table form compounds?

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02/11/19

What are the products of the following reaction based on solubility rules?
LiI(aq) + Pb(NO3)2(aq) → ?
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02/11/19

Once the base (oh-) is added, why is it important to immediately start collecting data to determine the reaction order? What will happen if you let the solution sit around for a while in the cuvette?
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02/11/19

a rectangle has a length of 7 and a width of w. what is an expression for the perimeter
A) 14 + 4wB) 7 + wC) 14 + 2wD) 7 + 2w
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