Chemistry, 26.09.2019 17:30 treavonknorton
This force is a pull between all objects. it is the force that gives us weight here on earth. and, if we throw a rock off of a cliff, it is the force that causes the rock to fall to earth. what is this force?
a)
gravity
b)
friction
c)
magnetism
d)
air resistenace
Answers: 1
Chemistry, 22.06.2019 09:00
Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?
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, 22.06.2019 12:30
Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)
Answers: 1
This force is a pull between all objects. it is the force that gives us weight here on earth. and, i...
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