subject
Chemistry, 10.12.2021 21:30 yair7

Read the two paragraphs below from the section "A missed train and a dream".In 1867, when Mendeleev began writing "Principles of Chemistry," he set out to organize and explain the elements. He began with what he called the "typical" elements: hydrogen, oxygen, nitrogen, and carbon. Next he included the halogens. These had low atomic weights, reacted easily with other elements, and were readily available in nature. Chlorine — used to keep pools clean — is a halogen. Mendeleev begun using atomic weights as a principle of organization, but these alone did not present a clear system. At the time, elements were normally grouped in two ways: either by their atomic weight or by their common properties, such as whether they were metals or gases. Mendeleev’s breakthrough was to see that the two could be combined in a single framework. Which BEST explains how the two paragraphs help to develop the central idea of the article?AThey identify the elements that Mendeleev considered to be typical elements. BThey give background information about how Mendeleev first started creating a system to organize the elements. CThey provide information about how Mendeleev came to learn that he could combine the two grouping systems. DThey make a connection between Mendeleev's work in the 1800s and today by describing the modern use of chlorine.

ansver
Answers: 3

Another question on Chemistry

question
Chemistry, 21.06.2019 21:10
Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?
Answers: 2
question
Chemistry, 22.06.2019 07:00
Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane
Answers: 2
question
Chemistry, 22.06.2019 16:50
Answer asap need by wednesday morning calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 best answer will be brainliest
Answers: 3
question
Chemistry, 22.06.2019 18:50
At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver
Answers: 1
You know the right answer?
Read the two paragraphs below from the section "A missed train and a dream".In 1867, when Mendeleev...
Questions
question
Mathematics, 16.03.2020 20:06
question
Mathematics, 16.03.2020 20:06