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nata0808 [166]
3 years ago
13

What’s the correct answer

Chemistry
1 answer:
butalik [34]3 years ago
3 0
He ^ 2+

Helium has two electrons the 2+ means that it has lost its two electrons leaving it with none.
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Define the "half-life" of a radioisotope
elena55 [62]
The amount of time it takes for 1/2 of it to decay or dissapear

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example

lets say half life of element x is 1 year
if yo has 32 grams, after  1 year, it decays to 16g
2 years decays to 8
3 years decays to 4
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8 0
3 years ago
Which of the following states of matter occurs at the highest temperature?
Aleks [24]
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7 0
3 years ago
Read 2 more answers
Na2CO3(aq) + CaCl2(aq) — 2 NaCl(aq) + CaCO3(s)
attashe74 [19]

Answer:

100 mL

Explanation:

Given data:

Mass of CaCO₃ produced = 2.00 g

Molarity of CaCl₂ = 0.200 M

Volume of CaCl₂ needed = ?

Solution:

Chemical equation:

Na₂CO₃  + CaCl₂    →      2NaCl + CaCO₃

First of all we will calculate the number of moles of CaCO₃.

Number of moles = mass/molar mass

Number of moles = 2.00 g / 100.09 g/mol

Number of moles = 0.02 mol

Now we will compare the moles of CaCO₃ and CaCl₂.

              CaCO₃          :            CaCl₂

                   1                :               1

                 0.02           :              0.02

Thus, 0.02 moles of CaCl₂ react,

Volume of CaCl₂ reacted:

Molarity = number of moles / volume in L

0.200 M = 0.02 mol / volume in L

Volume in L = 0.02 mol / 0.200 M

Volume in L = 0.1 L

Volume in mL:

0.1 L × 1000 mL/1L

100 mL

5 0
3 years ago
ANYONE PLEASE HELP BY THURSDAY!!
sladkih [1.3K]

Answer:

c

Explanation:

i dont have one

5 0
2 years ago
Protons are positively charged and repel other protons. Which order particle is found in the nucleus and separates protons so th
jenyasd209 [6]
A neutron, I'm technically not really guessing but I'm kind of guessing because there's only 3 particles in a atom, a proton, neutron and electron, for only protons and neutrons live in the nucleus so be deduction would be neutrons.
4 0
3 years ago
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