01/04/21

Chemistry (mass)
The daily recommended intake of calcium for adolescent females is approximately 1.10 g.  b)  Each tablet of calcium citrate contains 4.57 X 10-3 mol calcium citrate. How many tablets would an... more
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01/04/21

C2H3OH -> C2H4 + H2O What mass of ethene will. be obtained from 10g of ethanol, if the yield from the reatcion is 50 %
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01/04/21

2Al + 3F -> 2AlF3 What will be present after the reaction and how much when 40g of aluminium and 57g of fluorine react?
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01/04/21

Fe2(SO4)3 (s) -> Fe2O3 (s) + 3SO3 (g) What volume of sulfur trioxide at r.t.p will be produced, when 25g of iron sulfate are heated.
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01/04/21

In the Haber process, 14g of Nitrogen gas reacts with Hydrogen gas to produce Ammonia, NH3. How many grams of Ammonia will be made?

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01/04/21

Decide whether each proposed multiplication or division of measurements is possible. If it is possible, write the result in the last column of the table.
is it possible? yes or no.if yes, please write the right measurement.1.0g * 7.0cm =?
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01/03/21

% composition of a mixture
A mixture of propane and methane occupied 122 mL at 25⁰C and 1.0 atm. This mixture was totally burned in excess O2 to produce CO2(g) and H2O(g). The mass of the CO2produced was... more
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01/03/21

Is the value of a mole 6.022*10^23 or 6.023*10^23?
I've come across both these values in different books but I'm not sure which is correct.
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01/03/21

Electrochemistry of corrosion

Co on Ag noble or sacrificial coating and why
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01/02/21

Physical or Chemical Change
Calcium chloride + water Sodium hydrogen carbonate + Hydrochloric acid I think # 2 is chemical change because carbon dioxide and water are form. Is that correct?But for #1 reaction, it produces... more
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01/02/21

Calculate heat of combustion of cell for the following reaction CH11.66N0.2O0.27+1.28O2->Co2+0.1N2+0.83H2o. If the heat of combustion of substrate is 104kJ/g, yH=56KJ/g cells

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01/02/21

Physical or Chemical Change
When Iron (III) chloride reacts with potassium thiocyanate, the color of the solution changed to red, but no new substance is formed?So is this a physical or chemical change?
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01/02/21

Physical or Chemical Change?
Dissolving ammonium chloride in water is a physical or chemical change?
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01/02/21

Setting up a unit reprefix conversion
A student sets up the following equation to convert a measurement.(The ? stands for a number the student is going to calculate.) Fill in the missing part of this equation.(52. mL) * = ? dL
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01/02/21

Setting up a unit reprefix conversion
(52. mL) * = ? dL
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01/01/21

Carbon makes up what percentage (by mass) of caffeine (C8H10N4O2)? Show your work.
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01/01/21

What kind of ion will nitrogen form? Type the symbol with the appropriate charge.
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01/01/21

What is one similarity and one difference between a binary ionic compound and a binary molecular compound?
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01/01/21

Looking at the name of an acid, how do you know if it only contains two elements or if it contains more than two?

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01/01/21

Identify the molecular compounds in the list below. (There can be more than one correct answer)
i. K2Oii. CO2iii. SO2iv. AlCl3
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01/01/21

When naming an acid, if it contains a polyatomic ion that ends in -ite, you should change the ending to
A. -icB. -ateC. -ideD. -ous
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01/01/21

What is the correct name for this ion: Cl⁻?
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12/31/20

How do you determine the chemical formula of an ionic compound from the name of the compound?
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12/31/20

Explain the relationship between pH, POH, hydronium concentration and hydroxide concentration and be prepared to complete a boxed equation

H+    ________x_______OH-   1x10^-11_________pH    3________________POH  _______y__________
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12/30/20

What is the difference between a single replacement reaction and a double replacement reaction?
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