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4 years ago

14

Which of the following will result in a chemical change?

1 answer:

Zarrin [17]4 years ago

5 0

The answer would be C. because if you burn coal can you get the same piece of coal back?

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Test tube of ammonium chloride (NH4Cl) being heated over a bunsen burner flame. Ammonium chloride decomposes readily when heated, but condenses in the cooler area at the top of the test tube. This is a reversible reaction, where the ammonium chloride decomposes into the gases ammonia (NH3) and hydrogen chloride (HCl).

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How many grans of NaoH Are needed to neutralize grans of H2So4

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4 years ago

Calcium chloride has a melting point of 772°C, and water has a boiling point of 100°C. Which statement is true for calcium chlor

KonstantinChe [14]

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3 years ago

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If a neutral atom with 88 electrons undergoes 2 rounds of beta minus decay, what will be the new element?

Charra [1.4K]

Answer:

The new element will be thorium-226 (²²⁶Th).

Explanation:

The beta decay is given by:

$^{A}_{Z}X \rightarrow ^{A}_{Z+1}Y + \beta^{-} + \bar{\nu_{e}}$

Where:

A: is the mass number

Z: is the number of protons

β⁻: is a beta particle = electron

$\bar{\nu_{e}}$ : is an antineutrino

The neutral atom has 88 electrons, so:

$e^{-} = 88 = Z$

Hence the element is radium (Ra), it has A = 226.

If Ra undergoes 2 rounds of beta minus decay, we have:

$^{226}_{88}Ra \rightarrow ^{226}_{89}Ac + \beta^{-} + \bar{\nu_{e}}$

$^{226}_{89}Ac \rightarrow ^{226}_{90}Th + \beta^{-} + \bar{\nu_{e}}$

Therefore, if a neutral atom with 88 electrons undergoes 2 rounds of beta minus decay the new element will be thorium-226 (²²⁶Th).

I hope it helps you!

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3 years ago