Chemistry, 17.01.2020 02:31 khenalilovespandas
Suppose you wanted to heat a mug of water (178 ml) from room temperature 10 °c to 52 °c to make a cup of tea. how much energy (in units of joules) would you need from your microwave? (cwater=4.184 j/g˚c)
Answers: 3
Chemistry, 21.06.2019 21:00
Which statement describes evidence of a chemical reaction? a) ice melting eliminate b) water boiling c) lighting a match d) grape juice freezing
Answers: 3
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
Suppose you wanted to heat a mug of water (178 ml) from room temperature 10 °c to 52 °c to make a cu...
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