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amid [387]
3 years ago
10

Which type of change creates a new substance, physical or chemical?

Chemistry
2 answers:
Fynjy0 [20]3 years ago
7 0
A chemical change creates a new substance. A physical change doesn't alter a substance while a chemical change does.

Hope this helps!
elena-14-01-66 [18.8K]3 years ago
4 0
A chemical change does
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In which main energy level does the 'd' sublevel first appear? K (first main energy level) L (second main energy level) M (third
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Answer:

M (third main energy level)

Explanation:

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The subshells in these main orbitals are represented by s,p,d and f. For the K shell, the principal quantum number is m and its sublevel notations are s,p and d. This is where the d-sublevel first appears.

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8 0
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What mass of f2 is needed to produce 120. g of pf3 if the reaction has a 78.1% yield?
lesya692 [45]

write the equation for the reaction

that is 6 F2 +P4 =4 PF3

find the theoretical mass that is

let the theoretical yield be represented by y

theoretical yield = 78.1/100 = 120/y

y= 153.6 grams

find the number of moles of  PF3

moles = mass/molar mass

= 153.6/87.97 =1.746 moles

by use of mole ratio between  F2 :PF3 which is 6:4 the moles of F2 is therefore= 1.746 x 6/4 = 2.62 moles

mass = moles x molar mass

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6 0
3 years ago
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