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3 years ago

Which procedure would best allow a scientist to observe a chemical property of hydrochloric acid (HCI) solution?

Chemistry

2 answers:

makkiz [27]3 years ago

6 0

Effervescence of h2 gas will be produced which burns off a glowing split with a pop sound when hcl reacts with a base

ss7ja [257]3 years ago

4 0

Answer:

Adding a piece of Zn

Explanation:

Adding zinc (Zn) to a hydrochloric (HCl) solution will prove its acidity with a redox reaction:

$Zn(s) + 2H^+(aq) \longrightarrow Zn^{+2}(aq) + H_2(g)$

This reaction can be confirmed, by the observation of little bubbles in the surface of the metal: that bubbles are the hydrogen gas generated.

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Explanation:

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2 years ago

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3 years ago

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3 years ago

Read 2 more answers

Explain what is meant by the term "excited state" as it applies to an electron. Is an electron in an excited state higher or low

nikdorinn [45]

Answer:

Excited state of an electron is the state attained by an electron after it has absorbed energy and it moves further from the nucleus.

an electron is at higher energy when excited and at lower energy when at ground state.

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3 years ago

In an equimolar mixture of o2 and n2, are the mass fractions equal?

nika2105 [10]

Answer:

Explanation:

The mass fraction is defined as:

$w_{i}=\frac{m_{i} }{m_{t} }$

where:

wi: mass fraction of the substance i
mi: mass of the substance i
mt: total mass of the system

<u><em>The mass fraction of two substances (A and B), will be the same, ONLY if the mass of the substance A (mA) is the same as the mass of the substance B (mB).</em></u>

An equimolar mixutre of O2 and N2 has the same amount of moles of oxygen and nitrogen, just to give an example let's say that the system has 1 mole of O2 and 1 mole of N2. Then using the molecuar weigth of each of them we can calculate the mass:

mA= 1 mole of O2 * 16 g/1mol = 16 g

mB=1 mole of N2 *28 g/1mol=28 g

As mA≠mB then the mass fractions are not equal, so the answear is NO.

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3 years ago