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2 years ago

when a reactive metal is added to water, bubbles or fizzing can be observed. Explain the appearance of the bubbles

Chemistry

1 answer:

MakcuM [25]2 years ago

7 0

Answer:

This is because of the release of hydrogen gas in the reaction.

Explanation:

Metals react with water and produce a metal oxide and hydrogen gas. It also starts floating due to the bubbles of hydrogen gas sticking to its surface.

For eg:

2Mg. + 2H2O --------> 2MgOH + H2

Here,

Metal taken is magnesium(2Mg) which when reacts with water(2H2O) to form its oxide form (2MgOH) and hydrogen gas(H2) is released which comes outside water as bubbles.

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2 years ago

If 15.0 mL of phosphoric acid completely neutralizes 38.5 mL of 0.150 mol/L calcium hydroxide, what is the concentration of the

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Answer:

Let me give it a try.

H3PO4 + Ca(OH)2 = Ca3(PO4)2 + H2O

Balancing this reaction

2H3PO4 + 3Ca(OH)2 == Ca3(PO4)2 + 6H2O.

Moles= Molarity x Volume

Volume = 38.5ml = 0.0385L

Moles of Ca hydroxide = 0.150m/L x 0.0385L

(Notice the units canceling out...leaving moles).

=0.005775moles of Ca(OH)2.

From balanced reaction...

3moles of Ca(OH)2 completely reacts with 2moles of H3PO4

0.005775moles of Ca(OH)2 would completely react with....

= 0.005775 x 2/(3)

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Now we're looking for its Concentration in Mol/L

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2 years ago

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Answer:

Explanation:

Using Dalton's law of partial pressure

P total pressure = Pressure of helium + Pressure of neon + Vapor pressure of water

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3 years ago

What is the difference between an atom and an element? a An atom cannot be cut into smaller, but an element is a group of atoms

miss Akunina [59]

Answer:

Explanation:

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3 years ago

when a reactive metal is added to water, bubbles or fizzing can be observed. Explain the appearance of the bubbles​

when a reactive metal is added to water, bubbles or fizzing can be observed. Explain the appearance of the bubbles