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2 years ago

An electrical company charges 15 p per unit of energy (kWh).

Chemistry

1 answer:

Alja [10]2 years ago

4 0

Answer:

180 p

Explanation:

Energy refers to the capacity of doing work.

Amount charged by an electrical company = 15 p per unit of energy (kWh)

As 1 W = 1000 kW,

$500W=\frac{500}{1000}kW=0.5\,kW$

Also, 1 day = 24 hours.

Cost of running a 500 W freezer = 0.5 kW freezer for 1 hour = $15\times 0.5=7.5\,p$

Therefore,

cost of running a 0.5 kW freezer for a day ( 24 hours ) = $7.5\times 24=180\,p$

Amount charged by an electrical company = 15 p per unit of energy (kWh)

As 1 W = 1000 kW,

$500W=\frac{500}{1000}kW=0.5\,kW$

Also, 1 day = 24 hours.

Cost of running a 500 W freezer = 0.5 kW freezer for 1 hour = $15\times 0.5=7.5\,p$

Therefore,

cost of running a 0.5 kW freezer for a day ( 24 hours ) = $7.5\times 24=180\,p$

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Elemnt name, atomic number, atomic mass, protons, neutrons, elsctrons 1-10

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<h2><em>Answer:</em></h2><h2><em>Hydrogen </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 1 </em></h2><h2><em> </em></h2><h2><em>Symbol: H </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 1 </em></h2><h2><em> </em></h2><h2><em>Protons: 1 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 0 </em></h2><h2><em> </em></h2><h2><em>Electrons: 1 </em></h2><h2><em> </em></h2><h2><em>Helium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 2 </em></h2><h2><em> </em></h2><h2><em>Symbol: He </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 4 </em></h2><h2><em> </em></h2><h2><em>Protons: 2 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 2 </em></h2><h2><em> </em></h2><h2><em>Electrons: 2 </em></h2><h2><em> </em></h2><h2><em>Lithium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 3 </em></h2><h2><em> </em></h2><h2><em>Symbol: Li </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 7 </em></h2><h2><em> </em></h2><h2><em>Protons: 3 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 4 </em></h2><h2><em> </em></h2><h2><em>Electrons: 3 </em></h2><h2><em> </em></h2><h2><em>Beryllium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 4 </em></h2><h2><em> </em></h2><h2><em>Symbol: Be </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 9 </em></h2><h2><em> </em></h2><h2><em>Protons: 4 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 5 </em></h2><h2><em> </em></h2><h2><em>Electrons: 4 </em></h2><h2><em> </em></h2><h2><em>Boron </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 5 </em></h2><h2><em> </em></h2><h2><em>Symbol: B </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 11 </em></h2><h2><em> </em></h2><h2><em>Protons: 5 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 6 </em></h2><h2><em> </em></h2><h2><em>Electrons: 5 </em></h2><h2><em> </em></h2><h2><em>Carbon </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 6 </em></h2><h2><em> </em></h2><h2><em>Symbol: C </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 12 </em></h2><h2><em> </em></h2><h2><em>Protons: 6 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 6 </em></h2><h2><em> </em></h2><h2><em>Electrons: 6 </em></h2><h2><em> </em></h2><h2><em>Nitrogen </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 7 </em></h2><h2><em> </em></h2><h2><em>Symbol: N </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 14 </em></h2><h2><em> </em></h2><h2><em>Protons: 7 </em></h2><h2><em> </em></h2><h2><em>Neutrons:7 </em></h2><h2><em> </em></h2><h2><em>Electrons: 7 </em></h2><h2><em> </em></h2><h2><em>Oxygen </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 8 </em></h2><h2><em> </em></h2><h2><em>Symbol: O </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 16 </em></h2><h2><em> </em></h2><h2><em>Protons: 8 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 8 </em></h2><h2><em> </em></h2><h2><em>Electrons: 8 </em></h2><h2><em> </em></h2><h2><em>Fluorine </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 9 </em></h2><h2><em> </em></h2><h2><em>Symbol: F </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 19 </em></h2><h2><em> </em></h2><h2><em>Protons: 9 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 10 </em></h2><h2><em> </em></h2><h2><em>Electrons: 9 </em></h2><h2><em> </em></h2><h2><em>Neon </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 10 </em></h2><h2><em> </em></h2><h2><em>Symbol: Ne </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 20 </em></h2><h2><em> </em></h2><h2><em>Protons: 10 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 10 </em></h2><h2><em> </em></h2><h2><em>Electrons: 10 </em></h2><h2><em> </em></h2><h2><em>Sodium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 11 </em></h2><h2><em> </em></h2><h2><em>Symbol: Na </em></h2><h2><em> </em></h2><h2><em>Atomic Mass: 23 </em></h2><h2><em> </em></h2><h2><em>Protons: 11 </em></h2><h2><em> </em></h2><h2><em>Neutrons: 12 </em></h2><h2><em> </em></h2><h2><em>Electrons: 11 </em></h2><h2><em> </em></h2><h2><em>Magnesium </em></h2><h2><em> </em></h2><h2><em>Atomic Number: 12 </em></h2><h2><em> </em></h2><h2><em>Symbol: Mg 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How many moles of nitrogen are in 2.0×10−2mole of quinine?

galben [10]

Answer: 4 x 10 ∧-2 moles of nitrogen.

Explanation:

The chemical formular for quinine is ; C20 H24 N2 O2

As can be seen from the chemical formular;

1 mole of quinine contains 2 moles of Nitrogen

Thus; 2.0 x 10 ∧-2 moles of quinine would contain

2.0 x 10 ∧-2 x 2 = 4 x 10 ∧-2 moles of nitrogen.

Therefore 4 x 10 ∧-2 moles of nitrogen are in 2.0×10−2mole of quinine

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True or False: The moon's gravity affects the oceans nearest the moon because the moon's gravity pulls water into a tidal bulge.

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Explanation:

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I need help wit this can someone pls explain???

Crazy boy [7]

Based on the nature of the sub-atomic particles, the correct answers are:

5. No Charge

6. Negative

7. Neutrons and Protons

8. 35 electrons

9. atomic number is 5

10. atomic mass is 11

11. number of protons is 15

12. number of electrons is 20

13. number of neutrons is 30 (55 -25)

14. mass number is 7

15. number of neutrons is 11 (36 - 25)

<h3>What are the sub-atomic particles?</h3>

The sub-atomic particles are the electrons, protons, and neutrons.

The electron is negatively-charged, the proton is positively-charged, whereas, the neutron is neutral and has no charge.

The number of electrons in a neutral atom is equal to the number of protons.

The sum of protons and neutrons gives the mass number of the atom.

Considering the given questions:

5. What type of charge does a neutron have?

Answer = No Charge

6. What type of charge does an electron have?

Answer = Negative

7. Which two subatomic particles are located in the nucleus of an

Answer = Neutrons and Protons

8. If an atom has 35 protons in the nucleus, how many electrons will it have orbiting the nucleus?

Answer = 35 electrons

9. What is the atomic number of the atom in the diagram above?

Answer = atomic number is 5

10. What is the atomic mass/mass number of the atom in the diagram above?

Answer = atomic mass is 11

11. How many protons are in the nucleus of an atom with an atomic number of 15?

Answer = number of protons is 15

12. How many electrons are in the nucleus of an atom with an atomic number of 20?

Answer = number of electrons is 20

13. How many neutrons are in the nucleus of an atom with an atomic number of 25?

Answer = number of neutrons is 30 (55 -25)

14. What is the mass number of an atom with 3 protons, 4 neutrons, and 3 electrons?

Answer = mass number is 7

15. How many neutrons are in the nucleus of an atom that has an atomic mass of 36 and an atomic number of 25?

Answer = number of neutrons is 11 (36 - 25)

In conclusion, the mass number of an atom is the number of protons and neutrons in the nucleus of the an atom.

Learn more about atomic number and mass number at: brainly.com/question/487717

#SPJ1

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Aleks04 [339]

Convection currents are caused by the movement of the magma in the mantle.

Hope This Helps You!
Good Luck Studying :)

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3 years ago