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2 years ago

Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below.

Chemistry

1 answer:

Harman [31]2 years ago

5 0

Can you please add a picture of the case??

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What is 25 °C in °F?

kifflom [539]

Answer:

77°F

Explanation:

(25°C × 9/5) + 32 = 77°F

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3 years ago

When balance the following chemical equations N2+O2= NO2 the coefficient for O2 is

Papessa [141]

Answer:

Explanation:

N₂ + O₂ ---> NO₂

balance

N₂ + 2O₂ ---> 2NO₂

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2 years ago

Describe the direction of the wind movement around the center of high air pressure

Artemon [7]

The coriolis force caused by the Earth's rotation is what gives winds within high-pressure systems their clockwise circulation in the northern hemisphere (as the wind moves outward and is deflected right from the center of high pressure) and counterclockwise circulation in the southern hemisphere (as the wind moves ...

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3 years ago

Calculate the amount of heat needed to boil 64.7 g of benzene (C6H6), beginning from a temperature of 41.9 C . Round your answer

JulsSmile [24]

Answer: The amount of heat needed is = 4.3kJ

Explanation:

Amount of heat H = M × C × ΔT

M= mass of benzene = 64.7g

C= specific heat capacity = 1.74J/gK

ΔT = T2-T1

Where T1 is initai temperature = 41.9C

T2 is the final temperature( boiling point of benzene) = 80.1C

H= 64.7×1.74×80.7

H= 4300J

H=4.3kJ

Therefore, the amount of heat needed is 4.3kJ

8 0

3 years ago

A gas has a pressure of 810 kPa at 227°C. What will its pressure be at 27°C?

NeX [460]

486 kPa will be the pressure of gas at 27 degrees.

Explanation:

Data given :

Initial pressure of the gas P1 = 810 kPa

initial temperature of the gas T1 = 227 degrees OR 500.15 K

final pressure of the gas =?

final temperature of the gas = 27 degrees OR 300.15 K

Gay Lussac's law is used to calculate the pressure of the gas at 27 degrees or 300.15 K

$\frac{P1}{T1}$ = $\frac{P2}{T2}$

P2 = $\frac{P1T2}{T1}$

Putting the values in the equation:

P2 = $\frac{810 X 300.15}{500.15}$

P2 = 486 KPa

486 Kpa is the pressure of the gas when temperature was reduced to 27 degrees.

5 0

3 years ago