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NARA [144]
3 years ago
8

Please help me with this homework

Chemistry
1 answer:
Olin [163]3 years ago
8 0
Elements can be classified as metals, metalloids, and nonmetals,
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Physical Change because a new substance was not created and if it was a chemical change, a new substance would have to be created.
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reacts to form carbondioxide

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Which best illustrates the way in which radiation? Giving brainy.
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https://quizlet.com/283377931/radiation-flash-cards/

Explanation:

4 0
2 years ago
How many molecules of carbon dioxide, CO2, are present in 388.1 grams?
swat32

Answer:

53.11× 10²³ molecules

Explanation:

Given data:

Number of molecules of CO₂ = ?

Mass of CO₂ = 388.1 g

Solution:

Formula:

Number of moles = mass/ molar mass

Molar mass of CO₂ = 12× 1 + 16×2

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Now we will put the values in formula.

Number of moles = 388.1 g/ 44 g/mol

Number of moles = 8.82 moles

Now we will calculate the number of molecules by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

8.82 mol × 6.022 × 10²³ molecules / 1 mol

53.11× 10²³ molecules

6 0
3 years ago
Which feature is used to classify galaxies? age color shape size
kondor19780726 [428]

Answer:

C. Shape

Explanation:

Did the quiz! & galaxies are classified by shapes called "elliptical, spirial, &  irregular"

Good luck :)

8 0
3 years ago
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