Thermochemistry Lesson 1 - Enthalpy changes

A reaction that gives out energy to the surroundings causes the

• temperature to drop

• temperature to rise

• temperature to remain constant

• temperature to vary

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NGSS.HS-PS1-4

A reaction that causes the temperature of the surrounding to drop is

• endothermic

• exothermic

• displacement

• oxidation

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The enthalpy change when reactants in their standard state are converted to products in their standard state, the whole process taking place under standard conditions.

Identify the correct enthalpy.

• Combustion

• Formation

• Standard

• Ionisation

Bond making and bond breaking. Which of following is TRUE?

• During bond breaking, heat is absorbed
• During bond making, heat is absorbed
• During bond breaking, heat is released
• None of the above

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NGSS.HS-PS1-4

The SI unit of heat and energy is the __________.

• calorie
• heat
• joule
• watt

When iron nails get rusty, heat is released.  What process is this?

• Exothermic
• Endothermic

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NGSS.HS-PS1-4

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

• It is an exothermic reaction
• It is an endothermic reaction
• It is made of ice
• It is dissolving your mouth

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NGSS.HS-PS1-4

NGSS.HS-PS3-4

Standard conditions are;

• 273 K 1 atm

• 20 ^oC 1 atm

• 25 ^oC 2 atm

• 298 K 1 atm

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NGSS.HS-PS3-4

ΔH value in an endothermic reaction is a positive number.

• True
• False

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NGSS.HS-PS1-4

What type of reaction is shown in the reaction pathway?

• endothermic reaction
• exothermic reaction

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NGSS.HS-PS1-4