Which of the following process is exothermic?

Dry ice (solid carbon dioxide) subliming to form gaseous carbon dioxide

A lizard egg needs a temperature of 26-30 ° C to hatch properly. You place it next to a pouch of water which is 22 °C. What type of chemical do you need for the egg?

Calcium chloride because it will be exothermic.

Calcium chloride because it will be endothermic.

Citric acid because it will be exothermic.

Citric acid because it will be endothermic.

What is the activation energy?

The minimum energy needed by the reactants to form the products.

The energy lost in the reaction

Energy is released ; ΔH is negative; Going from Gas to Liquid, Liquid to Solid

Energy is absorbed ; ΔH is positive; Going from Gas to Liquid, Liquid to Solid

Energy is released ; ΔH is positive; Going from Solid to Liquid, Liquid to Gas

Energy is absorbed ; ΔH is negative; Going from Gas to Liquid, Liquid to Solid

Energy is absorbed ; ΔH is positive; Going from Solid to Liquid, and Liquid to Gas

Energy is absorbed ; ΔH is negative; Going from Liquid to Gas, and Gas to Liquid

Energy is released ; ΔH is negative; Going from Solid to Liquid, and Liquid to Gas

Energy is released ; ΔH is positive; Going from Solid to Liquid, and Liquid to Gas

Is the reaction exothermic or endothermic? H 2 + S + O 2 -> H 2 SO 4 ΔH = -811.13kJ

ΔH is negative so it is exothermic

ΔH is positive so it is exothermic

ΔH is positive so it is endothermic

ΔH is negative so it is endothermic

EXOTHERMIC AND ENDOTHERMIC REACTIONS

Authored by Navdeep Rajput

Chemistry

12th Grade

NGSS covered

Used 78+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In an exothermic reaction, heat is ...

taken in or absorbed

given out or released

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In an endothermic reaction, heat is ...

taken in or absorbed

given out or released

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of reaction occurs in a hand warmer

exothermic

endothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Exothermic reactions...

Absorb energy

Release energy

Release Color

Absorb Color

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is photosynthesis an exothermic or endothermic reaction?

Endothermic

Exothermic

Neither

Tags

NGSS.HS-PS1-4

NGSS.HS-LS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Baking bread and cooking an egg are examples of....?

Endothermic processes

Exothermic processess

None of these

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If a chemical reaction is EXOTHERMIC, the temperature would....

Stay the same

Increase

Decrease

Tags

NGSS.HS-PS1-4

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EXOTHERMIC AND ENDOTHERMIC REACTIONS

In an exothermic reaction, heat is ...

In an endothermic reaction, heat is ...

What type of reaction occurs in a hand warmer

Exothermic reactions...

Is photosynthesis an exothermic or endothermic reaction?

Baking bread and cooking an egg are examples of....?

If a chemical reaction is EXOTHERMIC, the temperature would....

Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?

Alka-seltzer in water is an example of a

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

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