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3 years ago

How does the electric force vary with distance

Chemistry

1 answer:

Yanka [14]3 years ago

5 0

Answer:

increasing the separation distance between objects decreases the force of attraction

Explanation:

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Which statement about fusion reactors is true? a Enriched uranium isotopes are used as fuel in fusion reactors. b Fuel for fusio

trapecia [35]

Answer:

b Fuel for fusion reactors can be extracted from ocean water.

Explanation:

The fuel is deuterium, which makes up 0.02% of the hydrogen atoms in water. The oceans contain more than a billion cubic kilometres of water, so that's a lot of deuterium.

a is wrong. The fuel for fusion reactors is deuterium.

c is wrong. There is much research, but there are no large-scale fusion reactors in operation.

d is wrong. Fusion reactors do not produce radioactive waste as spent fuel. Most of the radioactive waste would be the reactor core itself.

6 0

3 years ago

CAN ANYONE PLEASE HELP MY BOOKS ARENT HELPING!!!! THIS IS FOR FIRE TECH

Mazyrski [523]

Answer:

The answer to the question is;

The occupant load of the store having a floor area of 100,000 ft² is 3,317.86 persons.

Explanation:

Based on NFPA guidelines we have for sales on street floor, the allowable occupant load factor per person is 30 ft²

That is where the floor area is 100,000 square feet we have the number of allowable occupant given by

(100,000 ft²)/(30 ft²/Person) = $\frac{10000}{3} Persons$ or 3,333 persons

That is the occupant load of the store if the floor area is 100,000 square feet = 3,333 persons

Based on m² we have 9,290 m² will require 2.8 m²/person

which gives;

(9,290 m²)/(2.8 m²/person) = $\frac{9290}{2.8} Persons$ = 23225/7 or 3,317.86 persons

Therefore applying safety, we go with the lesser number and we have

The occupant load of the store having a floor area of 9,290 m² = 3,317.86 persons.

5 0

3 years ago

The temperature at which the vapor pressure of a liquid is equal to normal atmospheric pressure is the _______. A. boiling point

timurjin [86]

Answer:

A. boiling point

Explanation:

The correct answer is;

A. boiling point

The boiling point of a liquid is the temperature at which the vapour pressure is equal to the atmospheric pressure.

B. melting point

This option is wrong because the melting point is the temperature at which a solid undergoes a phase change to a liquid.

C. freezing point

This option is wrong because the freezing point is the temperature at which a liquid undergoes a phase change to a solid.

8 0

3 years ago

A container initially holds 1.24mol of hydrogen gas and has a volume of 27.8L. Hydrogen gas was added to the container, and the

Fantom [35]

Answer:

After increasing the volume, we have 1.81 moles of hydrogen gas in the container

Explanation:

Step 1: Data given

Number of moles hydrogen gas (H2) = 1.24 moles

Volume of hydrogen gas (H2° = 27.8 L

The final volume is increas to 40.6 L

Step 2: Calculate the new number of moles

V1/n1 = V2/n2

⇒with V1 = the initial volume = 27.8 L

⇒with n1 = the initial number of moles H2 = 1.24 moles

⇒with V2 = the final volume = 40.6 L

⇒with n2 = the new number of moles = TO BE DETERMINED

27.8L / 1.24 moles = 40.6 L / n2

n2 = 40.6 / (27.8/1.24)

n2= 1.81 moles

After increasing the volume, we have 1.81 moles of hydrogen gas in the container

3 0

3 years ago

Describe how you might prepare disodium phosphate given a solution of phosphoric acid, 0.500 molar and a solution of sodium hydr

PilotLPTM [1.2K]

Explanation:

When 2 moles of sodium hydroxide (NaOH) reacts with 1 mole of phosphoric acid (H3PO4) it gives 1 moles disodium phosphate Na2HPO4 and 2 moles of water.

0.5 molar solution indicates half moles of molecules are present in per ltr solution.

to prepare disodium phosphate you need to dilute phosphoric acid solution to 0.25 molar and add equal quantity of 0.5 molar solution.

$2 NaOH + H_3PO_4 \: \rightarrow \: Na_2HPO_4 + 2 H_2O$

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8 0

2 years ago