DE_Chem_1.1

DE_Chem_1.1.1_What Is Heat?

Thermal energy (as heat) moves from areas of high temperature to areas of lower temperature.

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​Hot to cold

​Temperature

Poll

A house needs insulation to keep the cold out: True or False?

• True

• False

applies to isolated systems; Objects within the system may gain or lose thermal energy, but the system’s total energy is constant. energy can neither be created nor destroyed, but it can be transformed to a different form of energy or transported somewhere else.

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​Law of Conservation

Applies to isolated systems

​

Conservation of Energy

Chem_1.1.2_What Is the Difference between Thermal Energy and Temperature?

Heat is the thermal energy that transfers from a hot body to a cool body until an equilibrium is reached.

​Heat

the sum of all the kinetic energy of its moleculesd like.

​

​Thermal Energy

Which has more thermal energy?

​Seawater in bucket

​Ocean

Multiple Select

Which scale is used to measure temperature?

• Kelvin

• absolute

• Fahrenheit

• Celsius

Thermal Energy Units

the energy required to raise the temperature of 1 gram of water by 1 °C

​calorie (cal)

an amount of energy equal to the work done by a force of 1 newton (N) acting through a distance of 1 meter (m)

​Joules (J)

The prefix "kilo-" means 1,000

1000 calories

​kilocalorie (kcal)

1,000 joules

​kilojoule (kJ)

Open Ended

Convert 516 calories (cal) into joules (J) and kilojoules (kJ).

DE_Chem_1.1.4

Multiple Choice

the state of matter that has a defined shape and volume with molecules that are closely packed and vibrate in place

• solid

• liquid

• gas

• plasma

Multiple Choice

A gas-like state of matter in which most of the particles are charged ions.

• solid

• liquid

• gas

• plasma

Multiple Choice

a state of matter with a defined volume but no defined shape and whose molecules roll past each other

• solid

• liquid

• gas

• plasma

Multiple Choice

a state of matter without any defined volume or shape in which atoms or molecules move about freely

• solid

• liquid

• gas

• plasma

the energy required to melt a unit of mass of a substance when its temperature is already at the melting point

Latent Heat of Fusion

​the energy required to change a liquid to vapor when its temperature is already at the melting point

Latent Heat of Vaporization

DE_Chem_1.1.5
How Can Two Objects of Different Masses Have the Same Temperature But Different Amounts of Thermal Energy?

Salt water has more particles in the same amount of sample, so it has MORE thermal energy

​

​Temp. vs. Thermal Energy

​​aluminum

​​steel

​​copper

​Specific Heat

The amount of energy required to change the temperature of 1 g of a given substance by 1 ºC (or 1 K) is its specific heat

​If a substance has a low specific heat, it takes relatively little energy to change its temperature. If it has a high specific heat, it takes a lot of energy to change its temperature. A substance with high specific heat resists changes in its temperature.

Multiple Choice

Which has a higher specific heat?

DE_Chem_1.1.6_What Are Some Examples That Show How Thermal Energy Is Transferred By Means of Conduction, Convection, and Radiation?

​

the transfer of heat energy within an object, or between objects that are directly touching each other, due to collisions between the particles in the objects

Conduction

the transfer of heat from one place to another caused by movement of molecules

Convection

a process by which energetic electromagnetic waves move from one place to another

Radiation

​Insulators: a material tt does not readily conduct electricity or heat

Word Cloud

Which type of heat transfer is demonstrated?

Word Cloud

This exemplifies what type of heat transfer?

Word Cloud

What form of heat transfer allows you to feel the heat when you stand next to this engine?

Dropdown

In conduction, thermal energy travels from areas of​

Select answer

to areas of ​

Select answer

temperature.

Fill in the Blanks

Multiple Select

Which is an example of an insulator?

DE_Chem_1.1.7_How Can Applying the Law of Conservation of Energy Help Solve Calorimetry Problems?

​The heat energy transferred by an object or substance going through a temperature change is expressed by this equation: Q=mcΔT , where Q is the amount of heat, m is the mass of the substance, c is its specific heat, and ΔT is the temperature change.

Open Ended

Consider 2.50 kg of hot copper at 98.0 °C, which is dropped into a tank containing 10.0 kg of water at 15.0 °C. As thermal energy transfers from copper to water, the metal’s temperature decreases while the water’s temperature increases. Because energy is conserved, the thermal energy removed by heat from the copper will equal the heat transfer to the water. Both copper and water will arrive at the same final temperature—the temperature of thermal equilibrium: T_eq. Find T_eq.