Chemistry, 02.07.2019 09:00 perezsamantha3oqr0za
How would you prepare 100 ml of 0.4 m mgso4 from a stock solution of 2 m mgso4? my attempt at answering this: using the formula (vi)(mi)=(vf)(mf) (vi)(2m)=(100)(0.4)=200-100(final volume)=100 ml i am assuming you would add 100 ml of water to the 2 m mgso4 200 ml to get the 0.4 m mgso4 100 ml
Answers: 1
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Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
Chemistry, 22.06.2019 17:10
Increasing the substrate concentration in an enzymatic reaction could overcome which of the following? a) the need for a coenzymeb) allosteric inhibitionc) competitive inhibitiond) insufficient cofactors
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Chemistry, 22.06.2019 20:30
Water undergoes a large change in density at 0 ∘ c as it freezes to form ice. calculate the percent change in density that occurs when liquid water freezes to ice at 0 ∘ c given that
Answers: 2
How would you prepare 100 ml of 0.4 m mgso4 from a stock solution of 2 m mgso4? my attempt at answe...
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