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Genrish500 [490]
4 years ago
9

Which element has exactly five electrons in the highest principal energy level (the outer shell)?

Chemistry
1 answer:
kap26 [50]4 years ago
4 0
Boron (B) has 3 electrons in the outer shell.
Barium (Ba) has 2 electrons.
Phosphorus (P) has 5 electrons.
Manganese (Mn) has 2 electrons.

The answer is C) P (phosphorus).
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HELP Which of the following fractions can be used in the conversion of 32 m3 to the unit mm3?
poizon [28]
We know that each millimeter contains 10⁻³ meters. Writing this as a ratio:
1 mm : 10⁻³ m

We require a conversion from m³ to mm³, so we must take the cube of the ratio we have made:
1 mm³ = (10⁻³)³ m³

Therefore, the conversion used will be:
(1 mm / 10⁻³ m)³

When we multiply by this conversion, we will get:
32 m³ = 32 x 10⁹ mm³
7 0
3 years ago
7. How many moles are there in 4.6 gms of Sodium(Na)?
Marizza181 [45]

Answer:

0.2mol

Explanation:

mol = mass/mr

mass = 4.6g

mr = 23

mol = 4.6/23

= 0.2mol

7 0
3 years ago
Which of these is an example of a physical change?
vladimir2022 [97]

Answer:

Their isn't your examples but I will give you mine

Freezing, Evaporation and so on.

6 0
3 years ago
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Anastasy [175]
<span>2<span>N2</span>+3<span>H2</span>→2N<span>H3

That's the balanced equation. As shown, 4 molecules of N2 would react with 12 molecules of H2. Since not that much H2 molecules exist, then it would serve as the limiting reactant. Therefore:

9 mol H2 * (2NH3 / 3H2) = 6 molecules of ammonia
</span></span>
5 0
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Sheila is on the track team and can run 500 yards in 40 seconds. How many meters can she run in 40 seconds?​
tamaranim1 [39]
She can run 457.2 meters in 40 seconds
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