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xeze [42]
3 years ago
12

I need help with this please

Chemistry
1 answer:
Annette [7]3 years ago
8 0

Answer:

1=Rb, 2=O, 3=As, 4=Al and 5=Ca

Explanation:

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2 years ago
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Nastasia [14]

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3 years ago
When 38^88Sr decays to 34^84Kr, a(n) ______________ is emitted
navik [9.2K]

Answer:

The correct answer is - alpha particle and positron.

Explanation:

In this question, it is given that, 38^88Sr decays to 34^84Kr, which means there is an atomic number decrease by 4, 38 to 34, and atomic mass decreases by 4 as well 88 to 84.

A decrease in the atomic mass is possible only when there is an emission of the alpha particle as an alpha particle is made of 2 protons and 2 neutrons. If an atom emits an alpha particle, there is a change in atomic number as it decreases by two, and its mass number decreases by four.

So after the emission of an alpha particle, the new atom would be

38^88Sr=> 36^84X => 34^84Kr

so there is also two positron emission that leads to decrease in atomic number by one with each emission:

38^88Sr=> 2^4He+ 36^84X => 36^84X + 2(1^0β+) => 34^84Kr

Positron decay is the conversion of a proton into a neutron with the emission of a positron that causes the atomic number is decreased by one, which causes a change in the elemental identity of the daughter isotope.

3 0
3 years ago
If you have one mole of a gas at 3.00 atm in a 3.0 L container what is the temperature of the gas?
vaieri [72.5K]

Answer:

n = 3.0 moles

V = 60.0 L

T = 400 K

From PV = nRT, you can find P

P = nRT/V = (3.0 mol)(0.0821 L-atm/K-mol)(400 K)/60.0L

P = 1.642 atm = 1.6 atm (to 2 significant figures)

Explanation:

6 0
3 years ago
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Virty [35]

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false, true, false - In reality stirring increases the speed of dissolving.

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4 years ago
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