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jek_recluse [69]
3 years ago
7

Helppppp plzzzzz ot due in an hour

Chemistry
2 answers:
Elenna [48]3 years ago
6 0

I hope this helps
Good luck
Anton [14]3 years ago
5 0

Answer:

3 for the first blank

4 for the second

0 for third

4 for the fourth

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Write the symbol for the ion with 68 electrons, 72 protons, and 106 neutrons.​
galina1969 [7]

Answer:

I think it should be Hafnium which is Hf.

8 0
3 years ago
What does the coefficient in a balanced chemical equation represent
murzikaleks [220]

First: the coefficients give the number of molecules (or atoms) involved in the reaction. In the example reaction, two molecules of hydrogen react with one molecule of oxygen and produce two molecules of water. Second: the coefficients give the number of moles of each substance involved in the reaction.

4 0
4 years ago
A 975 L balloon contains helium. On the ground the temperature is 30 0C and the pressure is 743 torr. What will be the balloon's
Archy [21]

Answer:

V₂ = 1518L

Explanation:

-Using combined gas law:

\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}

<em>Where P is pressure, V is volume and T is absolute temperature of 1, initial state and 2, final state of the gas.</em>

<em />

<em>Initial states:</em>

P₁ = 743 torr

V₁ = 975L

T₁ = 30°C + 273.15K = 303.15K

P₂ = 375 mmHg = torr

V₂ = Our incognite

T₂ = -35°C + 273.15K = 238.15K

Replacing:

\frac{743torr*975L}{303.15K} =\frac{375torrV_2}{238.15K}

<h3>V₂ = 1518L</h3>
6 0
3 years ago
What type of motion is illustrated in the diagram below?
Bezzdna [24]
You didn’t show the diagram
8 0
3 years ago
Read 2 more answers
The dipole moment of hf is 1.91d. what is the dipole moment of hf in c⋅m? express your answer in coulomb-meters to three signifi
Drupady [299]
<span>6.37x10^-30 coulomb-meters The unit for dipole moments is the Debye which is 1x10^-21 C*m^2/s divided by the speed of light (299792458 m/s). So the conversion factor is 1x10^-21 C*m^2/s / 299792458 m/s = 3.33564095E-30 C*m And converting 1.91 d to Cm gives 1.91 * 3.33564095E-30 C*m = 6.37x10^-30 coulomb-meters</span>
3 0
3 years ago
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