2 years ago

Which of the following is most likely an indication of a chemical change?

Chemistry

2 answers:

givi [52]2 years ago

6 0

Answer:

B.) A loud sound when a starter's pistol is fired at a race.

faust18 [17]2 years ago

4 0

B. A loud sound when a starters pistol is fired at a race

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What is the empirical formula for a compound if a sample contains 3.72 g of P and 21.28 g of Cl?

Ainat [17]

Given 3.72 g of P and 21.28g of Cl, converting these to moles: ( 3.72 g P)(mol P/30.97 g P) = 0.12 mol P (21.28 g Cl)(mol Cl/35.45 g Cl) = 0.60 mol Cl P:Cl = 0.12/0.60, therefore P: Cl =1/5 Therefore, PCl5 hope it helps

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DIA [1.3K]

V_1=49.8mL
T_1=18°C=291K
T_2=83°C=356K

Using Charles law

$\\ \sf\longmapsto V_1T_2=V_2T_1$

$\\ \sf\longmapsto V_2=V_1T_2\div T_1$

$\\ \sf\longmapsto V_2=\dfrac{49.8(356)}{291}$

$\\ \sf\longmapsto V_2=\dfrac{17728.8}{291}$

$\\ \sf\longmapsto V_2=60.9mL$

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GrogVix [38]

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