Chemistry, 03.09.2020 01:01 mastershadow2018
Dmitri Mendeleev developed a chart-like arrangement of the elements called the . He stated that if the elements were listed in order of increasing , their properties repeated in a regular manner. He called this the of the elements. The arrangement used today differs from that of Mendeleev in that the elements are arranged in order of increasing . Each horizontal row of elements is called a(n) . Each vertical column is called a(n) , or , because of the resemblance between elements in the same column, a(n) .
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
Chemistry, 23.06.2019 02:00
As light moves from one material into the next, which of the following affects how much the light waves will refract, or bend? angle at which the ray strikes the medium color of the material density of the material temperature of the light wave
Answers: 2
Chemistry, 23.06.2019 10:30
An atom that gains or loses one or more electrons is called a(n)
Answers: 1
Dmitri Mendeleev developed a chart-like arrangement of the elements called the . He stated that if...
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