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Tcecarenko [31]
3 years ago
8

15. A food sample contains 25 g carbohydrate, 8 g fat and 5 g protein. The energy content is:

Chemistry
1 answer:
Musya8 [376]3 years ago
6 0

Answer:

C) 170 Cal

Explanation:

We are given the composition of a food sample as;

Carbohydrate = 25 g

fat = 8 g

Protein = 5 g

We are needed to determine the energy content of the food;

We need to know the amount energy yielded by each food substance.

That is; carbohydrates and proteins generate 4 calories per gram while fats generates 9 calories per gram.

Therefore;

Amount of energy will be;

= (25 × 4 cal/g) + (8g × 9 cal/g) + (5 g × 4 cal/g)

= 172 cal

Approximately , 170 calories

Therefore, the energy content will be 170 calories

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The bulk of the methane released into the atmosphere are as a result of various human activities.

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What is the relative mass of the electron?
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Answer:

The relative mass of electron is 0.0005

Explanation:

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Subatomic particles       Relative charge       Relative mass

Proton                                 +1                              1

Neutron                                0                             1

Electron                                -1                           0.0005

Electron:

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.

Symbol = e⁻

Mass= 9.10938356×10⁻³¹ Kg

electrical charge on electron= -1.6022 × 10⁻¹⁹ C

It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.

Proton and Neutron:

An atom consist of positively charged central core (nucleus) that is made up of Proton and neutron.  Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.

Symbol of proton= P⁺  

electrical charge on proton= +1.6022 × 10⁻¹⁹ C

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Symbol of neutron= n⁰

Mass of neutron=1.674929×10⁻²⁷ Kg

electrical charge on neutron= 0

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