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Ratling [72]
3 years ago
10

In the Gizmo, solid ice is gray, liquid water is blue, and water vapor gas is light blue. Heat or Chill the water as needed. Wha

t phase is the water in at -20 °C?
https://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=661&ClassID=3775683

(Copy and paste this URL and it will take you to the cite. If you don't have an account then sign up and after that the Phases of Water Gizmo should pop up.)

Question 1 options:

A.) solid

B.) liquid

C.) gas
Chemistry
1 answer:
Sauron [17]3 years ago
7 0

It would be a solid because at -20 °C it has turned to ice

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Which statements accurately describe Dmitri Mendeleev’s contributions to the development of the periodic table? Check all that a
Varvara68 [4.7K]

Answer:

  • <em><u>Mendeleev produced the first orderly arrangement of known elements.</u></em>

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Explanation:

  • <u>Mendeleev produced the first orderly arrangement of known elements and used patterns to predict the undiscovered elements.</u>

        Those two statments are true.

For the time being there were some 62 known elements. Before Medeleev some schemes to order part of the elements were proposed, but Medeleev showed the relationship between the atomic mass and the properties of the elements (supports second choice). This arrangement is known as the periodic table.

More importantly, Mendeleev predicted correctly the existance and properties of unknown elements, which is his major contribution: he left blanket spaces which where gradually filled when new elements where discovered (this supports the fourth choice).

The first modern chemistry book was written by Antoine Lavoisier (this discards first option).

Mendeleev ordered the elements by increasing mass number (this discards third choice), which was corrected later by the scientist Henry Moseley, who ordered the elements by increasing atomic number (number of protons).

Isotopes were not known by Mendeleev times, so this discards the last option.

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d.) granulated

Because the granulated sugar has a greater surface area.

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