Chemistry, 21.09.2019 12:00 catdog5225
What is inside of a galactic center? (inner bulge/bar of a galaxy) what kind of gases does it contain?
Answers: 1
Chemistry, 21.06.2019 21:00, gilbert325
Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!
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Chemistry, 22.06.2019 07:20, letsbestupidcx2314
Which of these conditions most likely produces an unstable isotope?
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Chemistry, 22.06.2019 11:40, Wemaybewrong
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 14:30, Dreynolds1667
100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)
Answers: 1
What is inside of a galactic center? (inner bulge/bar of a galaxy) what kind of gases does it conta...
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