Chemistry, 16.06.2020 03:57 abdullahs4639
A student collected the data shown in the table below during an experiment.
Liquid Characteristics
LiquidCharacteristics
Boiling Point Freezing PointColorRate of Evaporation
Mercury357 °C−39 °Cshiny silver graynegligible
Alcohol78 °C−115 °Ccolorless rapid
Based on the data, which of the following conclusions can be made about the use of mercury and alcohol thermometers?
An alcohol thermometer can measure the freezing point of a liquid that freezes at −80 °C.
An alcohol thermometer can measure a wider range of temperatures in a laboratory.
An alcohol thermometer is more reliable to measure the temperature of a liquid in a beaker that is 80 °C.
An alcohol thermometer is better to measure the boiling points of colorless liquids.
Answers: 2
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 18:50, christhegreat1
Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g. what is the percent by mass of water in the hydrate? %
Answers: 1
A student collected the data shown in the table below during an experiment.
Liquid Characteristics<...
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