7th Grade B1L5 Changes at the Molecular Level

B1L5: Changes in Energy at the

Molecular Level

QOD

Which of the following groups is mostly used in
building materials?
a.) Transition metals
b.) Halogens
c.) Noble gases
d.) Alkali metals

New vocabulary

Add these vocabulary words to your glossary:
◉

Collide (Colisión) -- To strike or hit something with any amount of
force

◉

Kinetic Energy (Energía cinética) -- Energy of motion

◉

Molecule (Molécula)-- The simplest unit of a chemical compound
that can exist, formed when two or more atoms join together
chemically

◉

Pressure (Presión)-- Force exerted on matter through contact with
other matter; affects melting and boiling points

New vocabulary

Add these vocabulary words to your glossary:
◉

Temperature (Temperatura)-- Average kinetic energy of all the
particles in a material; measured by a thermometer in degree

◉

Thermal Energy (Energía Térmica)-- The total kinetic (motion)
energy of the tiny particles that make up matter; the faster the
particles move, the warmer the matter becomes

◉

Vibrate (Vibrar) -- To move rhythmically and steadily; oscillate

New vocabulary

Add these vocabulary words to your glossary:
◉

Inert (Inerte) -- Not chemically reactive; used to describe a
substance

◉

States of matter (Estados de la materia) -- Distinct forms of matter
known in everyday experience: solid, liquid, and gas; also referred
to as phases

Graphic Organizer

Temperature Rises

Melting

Freezing

Evaporation

Condensation

Temperature Decreases

In a solid, particles
are attracted to each
other, close and
vibrate

Particles are close
together, always
moving and can slide
past each other

Particles are always in
motion, colliding with
each other, far apart
and freely moving

​Alkali Earth Metal Experiment

Match

Match the following

• definite shape and volume, particles only vibrate, low energy

• Definite volume indefinite shape

  Particles move and glide, moderate energy

• indefinite shape and volume

  particles move fast

  high energy

• Ionized gas

  Extemely high energy

  indefinite shape and volume, particles move fast

Solid

Liquid

Gas

Plasma

• Solid

• Liquid

• Gas

• Plasma

QOD

Explore 1: Changes in State

PhET simulation:

Directions:
1.

Complete the
handout.
(30-45 minutes)

2.

Once done
write a CER
and turn it in
for credit.
(15-20 minutes)

3.

The handout
becomes a
reference tool.

QOD

Fill in the Blank

As temperature increases the particles in a state of matter move ______.

​Content Connections Video

​Phase Change Notes

Phase Change Notes

There are two points in a phase change graph that we need to pay attention to:
●Melting point -- for all substances this is the temperature where a solid becomes
a liquid

●Boiling point -- for all substances this is the temperature where a liquid becomes
a gas

The most common ones that you will need to know are the following:
●Water (H2O) -
○Melting point: 0 ℃ (32℉)

○Boiling point: 100℃ (212℉)

●Gold (Au) -
○Melting point: 1064 ℃ (1948℉)

○Boiling point: 2060℃ (4892℉)

●Methane (CH4) -
○Melting point: - 161.5℃ (-258.9℉)

○Boiling point: -182 ℃ (-295.6℉)

Math Connections

QOD

Explore 2: Kinetic Energy and Temperature

Part 1:

Part 2:

Drag and Drop

Kinetic energy of a state matter increases when​ ​ ​

Placeholder

When temperature decreases kinetic energy ​

Placeholder

The relationship between kinetic energy and temperature is ​

Placeholder

Drag these tiles and drop them in the correct blank above

temperature increases

decreases

direct

Blooket Vocab Game

QOD

States of Matter and Kinetic Energy

States of Matter and Kinetic Energy
Phases table:

Phase

Particle Motion

Volume

Average Kinetic Energy

Solid

Vibrate in place, close
together

Defitinte

Slow

Liquid

Particles move around
and have more space
between them

Definite

Medium

Gas

Particles are moving
around a lot, colliding
with each other, have
lots of space between
them

Not Definite

High

Explore 3: Changes with Pressure

PhET: States of Matter: Basics

Directions:
1.

Complete
the
handout.
(30-45
minutes)

QOD

Fill in the Blank

How does pressure affect temperature in a closed system?

Reading Science B and Tweet All About It!

1.

Read the Reading Science B article on
stemscopes.

2.

Complete the Tweet all about it handout.

3.

Answer the comprehension questions.

4.

Complete the vocab quiz assigned on
Quizziz.

QOD

CER

Scenario: In the Phenomena video shown at the beginning of of this scope,
boiling water turned to “snow” when thrown in the -29 air. This is an
example of extreme weather conditions quickly cooling down boiling hot
water. It is not actually forming snow, but the water is quickly changing into
a vapor that then condenses into a cloud. For this to happen, you must use
very hot water and the air around the water has to be very dry and extremely
cold. Remember, you should not try this at home! Not all of the water will
cool quickly, what is left can still be very hot.

Prompt: Write a scientific explanation that states what happened to the
water molecules as the boiling water was thrown into the air.

After Test: Work on the Flocabulary assignment: States of Matter.

Additional QOD questions if needed:

QOD

QOD

QOD

CER

QOD 11/19