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tino4ka555 [31]
4 years ago
10

An element's_________is it's row in the periodic tables.

Chemistry
2 answers:
liq [111]4 years ago
6 0
An element's period is it's row in the periodic tables.
trapecia [35]4 years ago
3 0
Atomic number and atomic mass
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Unlike the earth, the sun _____.
jek_recluse [69]

the sun has no surface

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When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced.
KatRina [158]

Answer : The mass of aluminium (Al) is 0.413 g

Solution : Given,

Volume of H_{2}(g) at STP = 513 ml = 0.513 L           ( 1 L = 1000 ml )

Molar mass of aluminium = 26.98 g/mole

First we have to calculate the moles of H_{2}(g).

At STP,    

1 mole occupies 22.4 L volume

now, 0.513 L gives \frac{1mole\times0.513L}{22.4L} moles of H_{2}(g)

The moles of H_{2}(g) = 0.0229 moles

The Net balanced chemical reaction is,

2Al(s)+6HCl(aq)\rightarrow 2AlCl_3(aq)+3H_2(g)

From the balanced chemical reaction, we conclude that

2 moles of Aluminium (Al) produces 3 moles of hydrogen gas

Now the number of moles of aluminium required in 0.0229 moles of hydrogen gas = \frac{2moles\times 0.0229moles}{3moles} = 0.0153 moles

Now we have to calculate the mass of aluminium.

Mass of aluminium = number of moles × Molar mass = 0.0153 moles × 26.98 g/mole = 0.413 g

The mass of aluminium required is 0.413 g.

7 0
3 years ago
Which subatomic particles have a positive charge and are located in the nucleus?
d1i1m1o1n [39]

Answer: Atomic Particles

Explanation:

toms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

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3 years ago
Please refer to photo...
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Unsaturated solution
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4 years ago
What is the mass of 1 mole of chlorine ion ​
rjkz [21]

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one mole of chlorine is 34.453 g

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