Wednesday
December 11, 2013

# Posts by brett

Total # Posts: 118

Chemistry
A 28.4288 g sample of impure magnesium car- bonate was heated to complete decomposition according to the equation MgCO3(s) ! MgO(s) + CO2(g) . After the reaction was complete, the solid residue (consisting of MgO and the original impurities) had a mass of 16.0467 g. Assum- ing...

Chemistry
I have 3 I don't understand how to do. A 33.2 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 12.3 grams. What was the percent iron in the sample of ore? Answer in ...

Social Studies
The Grange (short form) or the National Grange of the Order of Patrons of Husbandry (long form).

writing
It would help if we knew why you had to reword the sentences. Are you trying to make them more concise? More specific? Reach a certain audience (grade level)?

physics
The answer is 3 but you need to know why! (Think about things like friction, wind, etc. which are forms of resistance and how fast a minute hand moves around the clock...does it ever change speed?)

chem
Figure out how much each compound weighs. Each side of the equation must have the same weight. So if you have 1.5x10^2 kg of aspirin, how much salicylic acid and acetic anhydride must you have to make that much PLUS have the required amount of HC2H3O2? For part B, multiple the...

geometry
Remember that similar polygons are ones that have the same ratio for all the sides. So in order to have an area 9 times as great the sides must be 3 times as long (area is linear x linear, or 3 x 3 = 9). (Check your answer--draw a picture if it helps!)

Economics
GDP = C + I + G + (X - M) Where: C = household consumption expenditures / personal consumption expenditures I = gross private domestic investment G = government consumption and gross investment expenditures X = gross exports of goods and services M = gross imports of goods and...

Geometry
Suppose J is between H and K. Use the Segment Addition Postulate to solve for x. Then find the length of each segment. HJ=2x+5 JK=3x-7 KH=18

Physics
Thanks a lot. For B the answer was 6.83x10^-4 deg.

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