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Andru [333]
3 years ago
12

CHECK MY ANSWER

Chemistry
2 answers:
kramer3 years ago
7 0

Answer: 1) squat down low and cover your head.

2) 1 gallon per person per day

3) dark skies, flying debris, and a freight train noise

Explanation:

Virty [35]3 years ago
5 0

Answer:

1.seek shelter.

2. i think the first one, one gallon per person per day.

3.the second one, dark sky, flying debris, train sound.

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Which statements are true?
schepotkina [342]

Explanation:

  • Evaporation is defined as a process in which liquid state of water is changing into vapor state.

So, we need to break the bonds of liquid substance in order to convert it into vapor state. And, energy is absorbed for breaking of bonds which means that evaporation is an endothermic process.

Hence, the statement evaporation of water is an exothermic process is false.

  • When a hydrocarbon reacts with oxygen and leads to the formation of carbon dioxide and water then this type of reaction is known as combustion reaction.

A combustion reaction will always release heat energy. Hence, combustion reaction is exothermic in nature.

  • When energy is transferred as heat from the surroundings to the system then it means energy is being absorbed by the system. And, absorption of heat is an endothermic process for which \Delta H is positive.
  • Whereas when energy is transferred from system to the surrounding then it means energy is released by the system which is an exothermic process.

Hence, for an exothermic process value of \Delta H is negative.

Thus, we can conclude that statements which are true are as follows.

  • A combustion reaction is exothermic.
  • When energy is transferred as heat from the system to the surroundings, \Delta H is negative.
  • For an endothermic reaction Deta H is positive.
5 0
3 years ago
How much heat is required to increase the temperature of 100.0 grams of iron from 15.0oC to 40.2oC? (The specific heat of iron i
Ksenya-84 [330]
Answer is: 1160 J of heat Is required to increase the temperature.
m(Fe) = 100 g.
∆T = 40,2 - 15 = 25,2°C.
C(Fe) = 0,46 J/g•°C.
Q = m(Fe) • C • ∆T.
Q = 100 g • 0,46 J/g•°C • 25,2°C
Q = 1160 J.
C - specific heat.

3 0
3 years ago
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ale4655 [162]

Answer:

MARK AS THE BRAINLIEST ANSWER

Explanation:

BRAINLIEST

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snow_tiger [21]

The correct answer on edgenuit.y is

<h2><u>C) Matter changes to a plasma state.</u> </h2>

Hope This Helps

5 0
3 years ago
Read 2 more answers
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