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Alika [10]
3 years ago
7

When the oxidation number of an element decreases over the course of a reaction, that element has beenWhich of the following che

mical reactions is an oxidation-reduction reaction?
CuSO4 + BaCl2 yields BaSO4 + CuCl2

AgNO3 + NaCl yields AgCl + NaNO3

Pb(NO3)2 + 2NaCl yields PbCl2 + 2NaNO3

Zn + H2SO4 yields ZnSO4 + H2
Chemistry
1 answer:
NARA [144]3 years ago
4 0
AgNO3+NaCl yields AgCl+NaNo3 (reduction)
...that's the only one I know
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What are 3 ways animals help the rainforests plants survive
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Their waste feeds the plants, When animals die they decompose and become natural fertilizer plants. Plants depend on animals for nutrients, pollination and seed dispersal.

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Define: Trapping, Heading, Dribbling, and Throwing in<br><br> I’ll give brainless
Vladimir79 [104]

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Trapping-bring (the ball) under control with the feet or other part of the body on receiving it.

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7 0
3 years ago
) B5H9(l) is a colorless liquid that will explode when exposed to oxygen. How much heat is released when 0.211 mol of B5H9 react
Tom [10]

<u>Answer:</u> The amount of heat released when 0.211 moles of B_5H_9(l) reacts is 554.8 kJ

<u>Explanation:</u>

The chemical equation for the reaction of B_5H_9 with oxygen gas follows:

2B_5H_9(l)+12O_2(g)\rightarrow 5B_2O_3(s)+9H_2O(l)

The equation for the enthalpy change of the above reaction is:

\Delta H_{rxn}=[(5\times \Delta H_f_{(B_2O_3(s))})+(9\times \Delta H_f_{(H_2O(l))})]-[(2\times \Delta H_f_{(B_5H_9(l))})+(12\times \Delta H_f_{(O_2(g))})]

We are given:

\Delta H_f_{(H_2O(l))}=-285.4kJ/mol\\\Delta H_f_{(B_2O_3(s))}=-1272kJ/mol\\\Delta H_f_{(B_5H_9(l))}=73.2kJ/mol\\\Delta H_f_{(O_2(g))}=0kJ/mol

Putting values in above equation, we get:

\Delta H_{rxn}=[(2\times (-1272))+(9\times (-285.4))]-[(2\times (73.2))+(12\times (0))]\\\\\Delta H_{rxn}=-5259kJ

To calculate the amount of heat released for the given amount of B_5H_9(l), we use unitary method, we get:

When 2 moles of B_5H_9(l) reacts, the amount of heat released is 5259 kJ

So, when 0.211 moles of B_5H_9(l) will react, the amount of heat released will be = \frac{5259}{2}\times 0.211=554.8kJ

Hence, the amount of heat released when 0.211 moles of B_5H_9(l) reacts is 554.8 kJ

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3 years ago
What is a neutralisation reaction <br> Thanks you :)
Ronch [10]
Neutralization is a chemical reaction when an acid and a base react with each other in regards of the quantity of each.
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