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dsp73
3 years ago
8

Which piece of evidence would suggest an unknown substance is an ionic compound? it conducts electricity when dissolved in water

. it is a liquid at room temperature. it has a low melting point. it is a gas at room temperature.
Chemistry
2 answers:
Nikolay [14]3 years ago
7 0

It conducts electricity when dissolved in water

LekaFEV [45]3 years ago
3 0

The correct answer is the first option. The piece of evidence would suggest an unknown substance is an ionic compound is that <span>it conducts electricity when dissolved in water.</span><span>  A</span><span>n ionic compound dissociates into ions when in aqueous solution. These ions move freely in the solution and can allow the flow of electricity into the solution.</span>

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3 years ago
3. What determines the mass number of an element?<br> The mumhor of nrotons
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Pb(SO4)2 + 4 LiNO3 → Pb(NO3)4 + 2 Li2SO4
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Answer:

4.5 moles of lithium sulfate are produced.

Explanation:

Given data:

Number of moles of lead sulfate = 2.25 mol

Number of moles of lithium nitrate = 9.62 mol

Number of moles of lithium sulfate = ?

Solution:

Chemical equation:

Pb(SO₄)₂ + 4LiNO₃      →     Pb(NO₃)₄ + 2Li₂SO₄

Now we will compare the moles of lithium sulfate with lead sulfate and lithium nitrate.

                       Pb(SO₄)₂        :         Li₂SO₄

                            1                :             2

                          2.25           :          2/1×2.25 = 4.5 mol

                       LiNO₃            :             Li₂SO₄

                           4                :                2

                           9.62           :             2/4×9.62 = 4.81 mol

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2 years ago
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