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4 years ago

Which of the following atoms has six valence electrons? (2 points)

Chemistry

1 answer:

irakobra [83]4 years ago

4 0

The correct answer is Sulfur (S).

Sulfur has 6 valence electrons because it is located in Group 16 (or the sixth group over if you don’t count the transition metals). This means that one atom of sulfur has 6 electrons in its outermost shell out of 8 total “spots”, which you can count by counting the group numbers (excluding the transition metals) from Group 1 (with one valence electron) to Group 18 (the noble gases with full valence or outer shells).

By this same logic, Carbon (C) has 4 valence electrons and Cesium (Cs) has 1 valence electron, so neither of these is the correct answer.

Hope this helps!

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What is the wavelength of radio waves? Which statement is true for a cooling curve? A. It shows how the temperature of the subst

ladessa [460]

Answer:

Most radio waves have wavelengths between 1 mm and 100 km.

A cooling curve shows A. how the temperature of a substance falls as heat is removed.

Explanation:

Radio waves are the longest of all the waves in the electromagnetic spectrum.

Most have wavelengths between 1 mm and 100 km, although there is no upper limit.

Some radio waves have wavelengths of 10 000 km.

A cooling curve (see image below) shows how the temperature of a substance falls as it is cooled.

In Option E., a decrease in temperature would cause an energy loss.

Options B., C., and D. involve the addition of heat.

5 0

4 years ago

ASAP WILL GIVE BRAINLIEST!!

Nataly_w [17]

Answer:

The answer to your question is a) N₂ b) 3.04 g of NH₃

Explanation:

Data

mass of H₂ = 2.5 g

mass of N₂ = 2.5 g

molar mass H₂ = 2.02 g

molar mass of N₂ = 28.02 g

molar mass of NH₃ = 17.04 g

Balanced chemical reaction

3H₂ + 1 N₂ ⇒ 2NH₃

Calculate the theoretical yield 3H₂ / N₂ = 3(2.02) / 28.02 = 0.22

Calculate the experimental yield H₂/N₂ = 2.5/2.5 = 1

Conclusion

The limiting reactant is N₂ (nitrogen) because the experimental proportion was higher than the theoretical proportion.

28.02 g of N₂ -------------------- (2 x 17.04) g of NH₃

2.5 g of N₂ -------------------- x

x = (2.5 x 2 x 17.04) / 28.02

x = 85.2 / 28.02

x = 3.04 g of NH₃

6 0

3 years ago

Is heat conductivity a physical or chemical property?

Lena [83]

Chemical property because heat is not electrical.

8 0

3 years ago

Help pleaseeeeeeeeeee

hichkok12 [17]

Answer:

D 1 and 3 only I am not sure

Explanation:

6 0

3 years ago

The osmotic pressure of a saturated solution of strontium sulfate at 25 ∘C∘C is 21 torrtorr. Part A What is the solubility produ

USPshnik [31]

Answer

solubility product = 3.18x 10^-7

Explanation:

We were given the pressure in torr then we need to convert to atm for consistency, ten we have

21torr/760= 0.0276315789 atm

21 Torr = .0276315789 atm

P = i M S T

M = P / iRT

Where p is osmotic pressure

T= temperature= 25C+ 273= 298K

for XY vanthoff factor i = 2

S = 0.0821 L-atm / mol K

M = .0276315789 atm / (2)(0.0821 L atm / K mole)(298 K)

M = 0.000564698046 mol/liters

solubility= 0.000564698046 mol/liters

Ksp = [X+][Y-]

Ksp = X^2

Ksp = [Sr^+2] * [SO4^-2]

Ksp = X^2

Ksp = (0.000564698046)^2

Ksp = 3.18883883 × 10-7

Ksp = 3.18x 10^-7

solubility product = 3.18x 10^-7

Therefore, the solubility product of this salt at 25 ∘C∘C is 3.18x 10^-7

7 0

3 years ago