Chemistry, 08.07.2019 16:00 pamelperezz26
Δabc and δdef are similar. the lengths of and are 5 units each, and the length of is 6 units. if the length of is 3 units, then the length of is units. if is 53°, then is °.
Answers: 2
Chemistry, 22.06.2019 05:00
Type the letter that represents the correct location for each particle type below.
Answers: 1
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, 23.06.2019 02:00
Scientists are often interested in knowing the molar heat of combustion – the heat released during the combustion of one mole of a substance. use the periodic table to find molar masses. how many moles of ethanol are present in the sample?
Answers: 2
Δabc and δdef are similar. the lengths of and are 5 units each, and the length of is 6 units. if the...
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