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luda_lava [24]
3 years ago
15

A thin sheet of aluminum can block _____.

Chemistry
1 answer:
BartSMP [9]3 years ago
6 0
It can block light.  Please mark Brainliest!!!
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In a step-down transformer, which side has more wire loops?
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B. The Secondary side of the step down transformer.
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An airplane flies at a constant speed of 920 km/h. How long will it take the plane to travel a distance of 1150 km?
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1.25 hours or 75 minutes or 1 hour and 15 minutes

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Complete the following sentences:
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Explanation:

a) In an exothermic reaction, the energy transferred to the surroundings from forming new bonds is ___more____ than the energy needed to break existing bonds.  

b) In an endothermic reaction, the energy transferred to the surroundings from forming new bonds is ___less____ than the energy needed to break existing bonds.  

c) The energy change of an exothermic reaction has a _____negative_______ sign.  

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The energy changes occur during the bonds formation and bonds breaking.

There are two types of reaction endothermic and exothermic reaction.

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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

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

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C + O₂   →  CO₂ + 393 Kj/mol

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3 years ago
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Answer in explanation

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Manganese Mn , Rhenium Re and Bohrium Bh

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Who is the father of phycis<br>​
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Galileo Galilei

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