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Alborosie
2 years ago
5

How was the periodic table developed?

English
1 answer:
Ulleksa [173]2 years ago
8 0

Answer: In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them

Explanation:

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Giving brainliest for CORRECT awnser.
Butoxors [25]

Answer:

B. Before you've written your essay.

Explanation:

Your outline will give you the "skeleton" of how your essay will look like. From there, you can add more information to help "fill that skeleton". This step is one that you do not have to do if you don't have enough time, but is a good step to take for a usually better essay.

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4 0
3 years ago
The word well is an ____________ so it is only used to modify a _____________ . A) adverb, noun or pronoun B) adverb, verb C) ad
Contact [7]

Answer:

The word well is an adverb so it is only used to modify a verb

B) adverb, verb C) adjective, noun or pronoun D) adjective, verb

Explanation:

Adverbs modify verbs, most of then ending in ly

example

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3 years ago
Solder is a silver metal used to hold pipes together when the solder is heated it melts and acts a type of metal glue Mrs Hanley
artcher [175]

Question

Solder is a silver metal used to hold pipes together when the solder is heated it melts and acts as a type of metal glue. Mrs. Hanley heats a piece of solder until it melts between two pipes what best identifies the point at which a physical change first takes place?

A) when the solder melts

B) when the solder cools down

C) when the solder is a soft metal

D) when the solder becomes solid again

Answer:

The correct answer is A)

Explanation:

The question is a good one. It asks to know when the PHYSICAL change first takes place. It means that it is possible to have changes to the Solder that is not immediately visible to the eye.

When any object is heated, its molecules vibrate even faster causing the bonds holding them to expand. This invariably leads to an expansion of the object. In the case of metals, metals when heated to a degree can actually become liquid.

The solder in this case has expanded before it melts. The melting is however easy to see more than the expansion of the molecules that make up the metal.

Metals when they melt do not assume the shape they were prior. When they cool off, they become as strong as they were before thus the binding quality of the solder in this case. However, they can only take the shape of the container they are poured into or the shape they were melted into if it was not containerized.

Cheers

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3 years ago
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plse dont report but i dont understand

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