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Tanzania [10]
3 years ago
11

How has the model of our solar system changed over time

Chemistry
1 answer:
vladimir2022 [97]3 years ago
4 0
People have thought that everything had went around the earth Our understanding of the universe has changed over time. Different civilizations have created different models to explain what the universe is and how the universe began. The Greek astronomer Ptolemy  used measurements of the sky to create his geocentric model. This had the earth at the center and all the planets and the sun orbiting around it.
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What element is found in group 5 period 3?
tatuchka [14]

Answer:

Phosphorus

Explanation:

A group is a vertical column on the periodic table.

A period is a horizontal row on the periodic table.

5 0
3 years ago
The melting point of H₂O(s) is 0 °C. Would you expect the melting point of H₂S(s) to be 85 °C, 0 °C or -85 °C.? Justify your cho
dimulka [17.4K]

Answer:

-85 °C

Explanation:

O and S are in the same group( Group 16). Since S is below O it's atomic mass is higher than O. So molar mass of H2S is higher than H2O. The strength of Vanderwaal Interactions ( London dispersion forces) increases when the molar mass increases. However, only H2O can form H bonds with each other. This is because electronegativity of O is higher than S and therefore H in H2O has a higher partial positive charge than H of H2S.

H bond dominate among these 2 types of forces so the strength of attractions between molecules is higher in H2O than H2S. Therefore more energy should be supplied for H2O to break inter

molecular forces and convert from solid to liquid state than H2S. So mpt of H2O must be higher than that of H2S.

5 0
3 years ago
The _____ is one of the way paces where North America and Pacific Plates meet.
Morgarella [4.7K]

Answer:

The ring of fire

Explanation:

The ring of fire is where they meet or at the fault lines

8 0
3 years ago
Read 2 more answers
When your muscle gets tired, it builds up the _______ and makes it more powerful.
Nataly [62]
The answer is “D Tissue”


Explanation:

when you workout you tear down your muscles (tissue) and after your done working out your body rebuilds tissue


hope this helps
5 0
2 years ago
The atoms of Group 7A elements gain electrons when they form ions.<br><br> True<br> False
artcher [175]
Answer: True.

Explanation.

The group 7A is actually named group 17.

That group is the halogens: F, Cl, Br, I, At, and Ts (Ts is one of the last elements discovered).

Those elements have 7 valence electrons (notice that it is the same number as the second digit in 17).

The atoms with 7 valence electrons will "easily" gain one electron to get the configuration of the next noble gas (8 valence electrons). That is why these elements gain electrons to form ions.

When atoms gain electrons form anions (negative ions). For example: F(-), Cl(-), Br(-), I(-).
6 0
3 years ago
Read 2 more answers
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