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Vlad [161]
3 years ago
7

Grade 7 science What is the important of a cell?​

Chemistry
2 answers:
Lapatulllka [165]3 years ago
8 0
Cells are the basic building blocks of all living things
masya89 [10]3 years ago
6 0

Answer:

Hope it will help you!!

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Which of these is found in the energy levels of an atom?
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Answer:

Electrons

Explanation:

Because the nucleas is In the middle and the Electrons surround it

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The strongest energy waves that the Sun emits are _____. gamma rays ultraviolet rays microwaves infrared rays
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Gamma rays

gamma rays has shortest wavelength which emits from the sun so it has highest energy because energy and wavelength are inversely proportional to each other.

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Which statement about astrology is not true? the positions of the planets at the time of birth have influence on a persons life
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The positions of the planets at the time of birth have influence on a person's life

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Directions: Convert the following word equations into formula equations then balance
UkoKoshka [18]

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8 0
2 years ago
I wanted known how many of the reaction below is energy released
Tema [17]

Answer:

2

Explanation:

In two reactions energy is released.

1) C₆H₁₂O₆ + 6O₂    →    6H₂O + 6CO₂ + heat

It is cellular respiration reaction.It involves the breakdown of glucose molecule in the presence of oxygen to yield large amount of energy. Water and carbon dioxide are also produced as a byproduct.

Glucose + oxygen → carbon dioxide + water + 38ATP

2) 2H₂ + O₂   →    2H₂O  ΔH = -486 kj/mol

The given reaction is formation of water. In this reaction oxygen and hydrogen react to form water and 486 kj/mol is also released.

The reaction in which heat is released is called exothermic reaction.

Exothermic reaction:

The type of reactions in which energy is released are called exothermic reactions.

In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.

For example:

Chemical equation:

C + O₂   →  CO₂

ΔH = -393 Kj/mol

it can be written as,

C + O₂   →  CO₂ + 393 Kj/mol

Endothermic reactions:

The type of reactions in which energy is absorbed are called endothermic reactions.

In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.

For example:

C + H₂O   →  CO  + H₂

ΔH = +131 kj/mol

it can be written as,

C +  H₂O  + 131 kj/mol  →  CO  + H₂

5 0
3 years ago
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