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2 years ago

1. Which is not an example of matter? (6.P.2.1) * Water Mrs. Saliba Imagination Air

Chemistry

1 answer:

Alchen [17]2 years ago

3 0

Answer:

Imagination

Explanation:

This isnt a real object

Hope this helps

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Ca3(PO4)2 + H2SO4 → CaSO4 + H3PO4 Balance this reaction if necessary

devlian [24]

Ca3(PO4)2 + 3 H2SO4 = 3 CaSO4 + 2 H3PO4
Reaction type: double replacement

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2 years ago

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What process takes place before an article is published in a scientific journal/

Goshia [24]

Before an article is published in a scientific journal or in any "peer-reviewed" journal the article is reviewed thoroughly by scholars from the journal as well as peers or scholars of the articles author from the same field. This process occurs to provide credibility to the ideas being published and so that readers and other scholars can rely on the validity of the material being published.

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2 years ago

How much do 3.01 x 1023 atoms of Helium weigh?

liraira [26]

Answer:

4.0 grams

Explanation:

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2 years ago

A radioisotope decays to give an alpha particle andPb-208.

oee [108]

Answer: The original element is $_{84}^{212}\textrm{Po}$

Explanation:

Alpha decay is defined as the process in which alpha particle is emitted. In this process, a heavier nuclei decays into a lighter nuclei. The alpha particle released carries a charge of +2 units.

The released alpha particle is also known as helium nucleus.

$_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\alpha$

For the given alpha decay process of an isotope:

$^{Z}_{A}\textrm{X}\rightarrow ^{208}_{82}\textrm{Pb}+_2^4\alpha$

To calculate A:

Total mass on reactant side = total mass on product side

A = 208 + 4

A = 212

To calculate Z:

Total atomic number on reactant side = total atomic number on product side

Z = 82 + 2

Z = 84

The isotopic symbol of unknown element is $_{84}^{212}\textrm{Po}$

Hence, the original element is $_{84}^{212}\textrm{Po}$

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3 years ago

What is an element that has more valence electrons than fluorine and less energy levels than sodium?

Radda [10]

From the periodic chart the only element between F and Na is Neon. Neon has one more valence electron 8 than fluorine 7, and is one energy level shy of Na.

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2 years ago