lenpol7

How many atoms of copper are in an old penny made of pure copper and weighing 2.15 g?

Differentiate y=4x+1/x?

how we distinguish CH3CH2OH and CH3OCH3?

what is: +51 + (−50) + (+49) + (−48)?

Chemistry KCLO3 Question?

Solve the following trigonometric equation where 0° <= x <= 360°. 6cosxsin^2x + cos^2x - 5cosx = 0?

From 8:40pm to 12:40am is how many hours?

solve by splitting the term 4x^2+7x-2 cheers:)?

Lg 5= 0.7 then what will be lg 125?

If 12kg of hydrogen is passed through s fuel cell, how much oxygen would be needed to react with it and how much water would be produced?

7.)Write the third and fifth term of an arithmetic sequence whose fourth term is a and the common difference is 2.?

find the slope, if exists, of the line containing the pair of points. (5,1)(6,-8)?

Please Help me with a math problem!?

Styrene has the empirical formula CH. It has a molar mass of 104 g. What is the multiplier to get the molecular formula?

What is the inverse of the function f(x) log4 x?

1 math question???!! 10 pts! help!?

How much CaCl2 do you need to make 500 mL of 1 M of CaCl2?

Which of the following compounds is soluble in water?

Write a balanced ion-electron half equation for the reaction which each undergoes when acting as an oxidising agent?

log equations: 7(5)^x=94?

What is the remainder when 7221 is divided by 25?

Magnesium + ................ → Magnesium chloride + ...................?

Does (tanΘ)(cosΘ) always equal sinΘ?

What is NaCl?

How do you balance this equation?

Chemistry, help? Acid/Base solutions. Thanks!?

ALGEBRA HELP: How much dirt is there in a hole 3 feet deep, 6 ft long and 4 ft wide?

I try to do this problem just cant seem to get it. SQRT58+9x = x + 4 What is X?

If I work from 3:30 to 7:30 how many hours is that?

Simplify 8(x + 6) - 5(x + 8).?

I need help..! Chemistry?

Equilibrium constant help! Thanks?

Chemistry condensed structural formula of each of the following molecules?

which of the following compound would you expect to have covalent bond c2o6 Na2O CsH ZnF2?

Math Help needed?

What is The Alps because as I think, I think it of Animal. LOL?

(x+4)^3 find product?

Which of the following equations has only one solution?

Pleasee Help!! If a triangle with a = 10.9 m, c = 30.2 m, and C = 50° exists. If it does, determine A to the nearest degree.?

temperature?

what is the capital of belguim?

why are areas near water not as cold as areas further inland during the fall?

Balancing oxidation reduction problem (BASIC MEDIUM) PLz. give the balanced equation .. Reducing agent and oxidizing agent thx.?

what is 30 divided by half?

In ionic bonds, electrons are ______, and in covalent bonds, electrons are ______. PLEASE HELP !!!!!!!!?

what is the ~above the = in a triangle equation?

Which is the limiting reactant in the following chemical equation? Zn + 2HCl >> 2 ZnCl2 + H2 with 10 moles of Zn and 15 moles of HCl?

what volume is occupied by 25 g of oxygen gas at a pressure of 733 mmhg and a temperature of 30.5 degrees?

if element 17 in a halogen where you would expect to find element 18?

The area of the curved surface of an iron -sphere is equal to the area of the total surface of a cylinder having length and radius?