How do you calculate Enthalpy of a reaction?

ΔH = ΔH products - ΔH reactants

Which statement is FALSE for an exothermic reaction?

Reactants have stronger bonds than products

Reactants higher in energy and less stable

Product lower in energy and more stable

Products have stronger bonds than reactants

Standard enthalpy of precipitation

Which of the following represents a correct thermochemical equation?

N 2 H 4(g) + H 2(g) --> 2NH 3(g) ∆H = -188 kJ

CH 4 + O 2 --> CO 2 + H 2 O ∆H = -891 kJ

What is a thermochemical equation?

A balanced chemical equation that includes the physical states of all reactants and products and the energy change, usually expressed as the change in the enthalpy.

A chemical equation where the temperature is shown

A balanced chemical equation showing the moles of reactants and products

An equation showing the difference between the work of the products and reactants

An equation that shows the number of molecules of products and reactants

Which of the following is INCORRECT?

The enthalpy of H 2 O(l) is not the same as the enthalpy of H 2 O(s)

What is the enthalpy for the following equation: H 2 O (s) + 6.01 kJ/mol --> H 2 O (l)

ΔH is 0 for all reactions because energy is not created nor destroyed

It is impossible to know the enthalpy with the information given.

Which represents a decrease in entropy?

condensation of steam on cold glass

Which has a +ΔS (system) ?

C 2 H 2 O 2 (g) → 2CO(g) + H 2 (g)

AgNO 3 (aq) + NaCl(aq) → AgCl(s) + NaNO 3 (aq)

H 2 O(g) + CO 2 (g) → H 2 CO 3 (aq)

Systems in nature tend to undergo changes toward

higher energy and less disorder

higher energy and more disorder

Heat and energy

Authored by Suzanne Monir

Chemistry

10th - 12th Grade

NGSS covered

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39 questions

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which material will heat travel through the fastest?

Plastic

Wood

Metal

Tags

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

When Water Turns into gas it is called?

Water Vapor

Darth Vapor

Melts

Tags

NGSS.MS-PS1-4

NGSS.MS-ESS2-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A device used to measure temperature

Thermometer

Barometer

Blabometer

hamamamometer

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The SI unit of heat and energy is the __________.

calorie

heat

joule

watt

Tags

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Temperature is a measure of average [blank] energy of individual atoms.

heat

potential

mechanical

kinetic

Tags

NGSS.HS-PS3-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

ΔH value in an endothermic reaction is a positive number.

True

False

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Temperature is a measure of average [blank] energy of individual atoms.

heat

potential

mechanical

kinetic

Tags

NGSS.HS-PS3-2

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Heat and energy

Which material will heat travel through the fastest?

When Water Turns into gas it is called?

A device used to measure temperature

The SI unit of heat and energy is the __________.

Temperature is a measure of average [blank] energy of individual atoms.

ΔH value in an endothermic reaction is a positive number.

Temperature is a measure of average [blank] energy of individual atoms.

True/False: The rate of a chemical reaction is unrelated to the spontaneity of the reaction.

What type of reaction is shown in the reaction pathway?

_?_ is the amount of energy (joules) required to raise the temperature of 1 mole of a substance by 1 K. Units are J/mol-K.

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