3 years ago

Compare and contrast Aufbau principle and the Pauli exclusion principle.

1 answer:

6 0

Answer: Pauli exclusion principle: only two electrons can occupy the same orbital and they must have opposite spin directions

Explanation:

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The Transition Elements can be divided into two types. List each type.

jenyasd209 [6]

Main group elements
transition metals
lanthanides
actindes.

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3 years ago

Consider the two electron arrangements for neutral atoms A and B. The outer electron of atom B has moved to a higher energy stat

romanna [79]

B I think the answer

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3 years ago

The combustion of propane may be described by the chemical equation C 3 H 8 ( g ) + 5 O 2 ( g ) ⟶ 3 CO 2 ( g ) + 4 H 2 O ( g ) C

Kipish [7]

Answer: 72 grams of $O_2(g)$ are needed to completely burn 19.7 g $C_3H_8(g)$

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Putting in the values we get:

$\text{Number of moles}=\frac{19.7g}{44g/mol}=0.45moles$

$C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(g)$

According to stoichiometry:

1 mole of $C_3H_8$ requires 5 moles of oxygen

0.45 moles of $C_3H_8$ require= $\frac{5}{1}\times 0.45=2.25$ moles of oxygen

Mass of $O_2=moles\times {\text {Molar mass}}=2.25\times 32=72g$

72 grams of $O_2(g)$ are needed to completely burn 19.7 g $C_3H_8(g)$

7 0

3 years ago

1) How many bonds can Sr atom form?<br>a) 5<br>c) 3<br>b) 4<br>d) 2

VashaNatasha [74]

Answer:

the answer is C

Explanation:

it can form 3 bonds

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3 years ago

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Which term describes rocks that absorb water?

KIM [24]

Answer:

C. porous

hope it helps!!!

please mark as the brainliest if it is correct!

8 0

2 years ago