0.5927-g sample was dissolved, and the Ca2+ and Ba2+
ions present were precipitated as BaC2O4
.H2O and
CaC2O4
.H2O. The oxalates were then heated in a thermogravimetric apparatus leaving a residue that weighed
0.5127 g in the range of 320°Câ400°C and 0.4362 g in the range of 580°Câ620°C. Calculate the percentage Ca
and percentage Ba in the sample.â
Answers: 2
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Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.
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If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.
Answers: 1
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Which type of fossil does this image depict?
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0.5927-g sample was dissolved, and the Ca2+ and Ba2+
ions present were precipitated as BaC2O4
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