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Juli2301 [7.4K]

3 years ago

5

Which of these elements are you least likely to find in nature as a pure element (that is, not combined with any other elements

in a compound)? Use the periodic table to answer the question. gold (Au) oxygen (O) argon (Ar) sodium (Na)

2 answers:

Delvig [45]3 years ago

7 0

The answer is sodium (Na)

<em>Let me know if u have anymore questions ☺</em>

Pani-rosa [81]3 years ago

7 0

Answer: sodium Na

Explanation:

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Describe how magnetic forces and electric forces are similar and different from each other

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<em>ANSWER:</em>

Objects that have the same charge, both positive or both negative, repel each other, and those with opposite charges attract each other. ... Similar to electric charges, opposite poles attract, and like poles repel. The stronger the magnets and the closer together they are, the stronger the magnetic force between them.

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3 years ago

A plane on the ground will weigh

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Answer:

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3 years ago

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The compound CaSO4 ionizes into a calcium ion and a sulfate ion (SO4). Calcium has two electrons in its outer shell. Upon ioniza

gtnhenbr [62]

Answer:

-2

Explanation:

Calcium is the element of second group and forth period. The electronic configuration of Calcium is - 2, 8, 8, 2 or $1s^22s^22p^63s^23p^64s^2$

There are 2 valence electrons of Calcium.

Thus, calcium loses two electrons to sulfate ion and sulfate ion accepts these electrons to form ionic bond.

Calcium sulfate, $CaSO_4$ is formed when 2 valence electrons of calcium are loosed and they are gained by sulfate ion.

$Ca^{2+}+SO_4^{2-}\rightarrow CaSO_4$

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3 years ago

Liquid nitrogen has a density of 0.808 g/mL and boils at 77 K. Researchers often purchase liquid nitrogen in insulated 185 L tan

Serga [27]

Answer:

37.14 %

Explanation:

Using the equation, mass, M = D1 * V1

= D2 * V2

Where,

D1 = density of the liquid Nitrogen

D2 = density of gaseous Nitrogen

V1 = volume of the liquid Nitrogen

V2 = volume of the gaseous Nitrogen

Calculating V2,

0.808 * 185 = 1.15 * V2

Volume of Nitrogen after expansion = 129.98 m3.

Volume = L * b * h

= 10 * 10 * 3.5

Volume of the room = 350 m3.

Fraction of air = volume of Nitrogen after expansion/volume of the room * 100

= 129.98/350 *100

= 37.14 %

5 0

2 years ago