July 22, 2014

Posts by kairi

Total # Posts: 5


Grade 11 Chemistry!
10% (m/m) sodium hydroxide solution, NaOH, is used to break down wood fibre to make paper. a) What mass of solute is needed to make 250mL of 10% (m/m) solution? b) What mass of solvent is needed? c) What is the molare concentration?

the other one came out wrong. 8x^2y^-2 (4xy^2)^-1 ________ . ___________ x^-2y x^2y its a fraction and you have to multiply I assume you mean [(8x^2 y^-2)/(x^-2 y)] x [(4xy^2)^-1/(x^2 y)] which can be rewritten = 8 x^4 y^-3 x [1/(4x^3y^3)] = 2 x y^-6

need help again!!!!! Simplify the expression. Use only positive exponents. 8x^2 y^-2 . (4xy^2)^-1 __________ ____________ x^-2y x^2y i'm sorry i can't read your question that well. use "/" sign for fractions and "*" sign for multiplication please.

need help please!!!!! (fraction) _____1____ 9x^-2 y^-1 I'm not exactly sure what you want to do but i'm assuming you want your exponents positive? just put the varibles with the negative exponents in the numerator. whenever you have a negative exponent that you want to...

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