CA 1 Review

Unit 1

Investigating Elements and Compounds

Unit 1 Vocabulary

● Element: a pure substance made of only one type of

atom

● Atom: the smallest particle of an element
● Molecule: two or more atoms combined chemically
● Compound: two or more different elements that are

chemically combined

Match

Match the picture to the vocabulary word

Atom

Molecule

Compound

• Atom

• Molecule

• Compound

● Chemical

Symbol: one
or two letters
representing
a chemical
element

● Periodic

Table

Match

Use your periodic table to match the chemical symbol to the name of the element.

• O

• C

• Na

• Cl

• H

Oxygen

Carbon

Sodium

Chlorine

Hydrogen

• Oxygen

• Carbon

• Sodium

• Chlorine

• Hydrogen

Chemical Formulas

● Atoms: add up ALL subscripts
● Elements: Count CAPITAL letters

H₂O

A: 2 + 1 = 3

E: 1 (H) + 1 (O) = 2

Chemical Formulas

● Atoms: add up ALL subscripts
● Elements: Count CAPITAL letters

CO₂

A: 1 + 2 = 3

E: 1 (C) + 1 (O) = 2

Multiple Choice

How many atoms are present in the compound CH4?

• 2
• 1
• 4
• 5

Multiple Choice

How many elements are present is the compound CH4?

• 1
• 5

• 2
• 4

Multiple Choice

How many carbon atoms are present in the compound CH4?

• 4
• 5

• 2
• 1

Unit 2

Investigating Changes in Matter and Solutions

Unit 2 Vocabulary

● Physical change: only alters the physical properties of

a substance

● Chemical change: a change in matter that produces a

new substance

Multiple Select

Select all examples of physical change below

• Cooking an egg

• Boiling water

• Ripping paper

• Burning a log

• Crushing a can

What are the 6 chemical evidences?

1. Precipitate
2. Energy Change
3. Unexpected Color Change
4. Gas Production and Bubbles
5. Unexpected Smell Changes
6. New Substance

P
E
C
B
S
S

Multiple Choice

Mixing baking soda and vinegar together causes fizzing. What evidence of chemical change is this?

• Unexpected color change

• Gas formation/

  bubbles

• Precipitate

• Energy change

Multiple Choice

Miking milk and vinegar causes a white solid to form. What evidence of chemical change is this?

• Unexpected color change

• Gas formation/

  bubbles

• Precipitate

• Energy change

What ONE question can we ask to determine if a
change is chemical or physical?

New Substance?

No

Yes

Chemical Change

Physical Change

Unit 2 Vocabulary Cont.

● Solution: a mixture of two

or more substances

● Solute: substance that is

dissolved into another
substance

● Solvent: substance

which another substance
is dissolved in

Solution Example

Saltwater

Multiple Choice

Identify the solute in the following solution:

Coffee powder + Milk = Coffee

• Coffee

• Milk

• Coffee powder

Unit 2 Vocabulary Cont.

● Aqueous solution:

a solution with
water as the
solvent

● Solubility: the

ability to be
dissolved (form a
solution)

Unit 2 Vocabulary Cont.

● Concentration: the amount of solute dissolved in an

amount of solvent

● Dilution: reducing the concentration of a solution by

adding solvent

Dilute → Concentrated

Multiple Choice

Read the descriptions of the two solutions below:

A - 100 mL of water with 50 g of salt.

B - 50 mL of water with 50 g of salt.

Which is more concentrated?

• Solution A

• Solution B

• They have the same concentration.

• The concentrations cannot be determined.

Multiple Choice

Read the descriptions of the two solutions below:

A - 50 mL of water with 25 g of salt.

B - 50 mL of water with 50 g of salt.

Which is more concentrated?

• Solution B is more concentrated.
• The concentrations cannot be determined.

• Both solutions have the same concentration.
• Solution A is more concentrated.

Unit 2 Vocabulary Cont.

● Rate of dissolution: the length of time it takes for a

certain amount of solute to dissolve in a solution

● What affects rate of dissolution?

○ Temperature
○ Stirring
○ Surface area

Factor

Image

Effect

Temperature
of solvent

Stirring

Surface area
of solute

↑ Temp ↑ Dissolving
↓ Temp ↓ Dissolving

↑ Stir ↑ Dissolving
↓ Stir ↓ Dissolving

↑ SA ↑ Dissolving
↓ SA ↓ Dissolving

Multiple Choice

Which chocolate powder will dissolve faster?

A - powder dissolved in hot milk

B - powder dissolved in cold milk

• A

• B

• They will dissolve at the same rate

• Sometimes A will dissolve faster, sometimes B will dissolve faster

Multiple Choice

Choose the sugar that will dissolve the fastest

• Whole sugar cube with stirring

• Whole sugar cube without stirring

• Crushed sugar cube with stirring

• Crushed sugar cube without stirring

Unit 3

Investigating Motion

Unit 3 Vocabulary Cont.

● Motion: the process of

changing position.

● Distance: the entire length of

an object’s path.

● Time: the measurable period

during which an action,
process, or change occurs.

Unit 3 Vocabulary Cont.

● Speed: the distance an

object moves per unit of
time. Ex: miles per hour

● Speed = distance/time

Multiple Choice

Which object has the highest average speed?

• A dog running 10 miles in 2 hours.

• A bicyclist riding 24 miles in 4 hours.

• A runner running 4 miles in 1 hour.

• A mouse scrambling 2 miles in 2 hours.

Math Response

What is the average speed of a train that travels 500 kilometers in 12 hours. Answer to the nearest tenth.

Type answer here

Correct Answer: 41.7

Deg^°

Rad

Add this to your glossary

3 steps to calculating average speed:

Step 1: Find the total distance

Step 2: Find the total time

Step 3: Using s=d/t, calculate the average speed

Average Speed

Multiple Choice

What is the average speed of a trip to Houston if your family drives the first 150 miles in 3 hours and the last 100 miles in 1 hour?

• 62.5 mi/h

• 70.2 mi/h

• 55.5 mi/h

• 68.7 mi/h

Rate

● the speed with which

something moves,
happens, or changes.
○ Ex: heart rate

● Speed = rate

Unit 3 Vocabulary
Cont.

● Velocity: speed in

a direction

What direction words could we use to describe the
cars’ velocities?

Multiple Choice

A cat is chasing a toy mouse as seen below. The cat and the toy are running at the same rate in the same direction. Compare their speeds and velocities.

• They have the same speed and the same velocity.

• They have the same speed but different velocities.

• They have different speeds and different velocities.

• They have different speeds and different velocities.

Multiple Choice

Which two objects below have the same velocity?

• A ball rolling 1 m/s left and a ball rolling 1 m/s right.

• A car driving 20 mi/h west and a truck driving 20 mi/h west.

• A child running 1 mi/h north and a dog running 2 mi/h north.

• A fish swimming 5 m/s east and a fish swimming 5 m/s south.

Unit 3 Vocabulary Cont.

● Displacement: the

change in an object's
position, measured as
the straight-line distance
between its starting and
ending points.

Unit 3 Vocabulary Cont.

● Distance-time graph:

shows the distance an
object travels over a
given period of time, with
the distance measured
on the y-axis and time
on the x-axis

Unit 3 Vocabulary Cont.

● Constant speed: an

object moving at a
speed that does not
change over time.

● Stationary: not moving,

having a speed of zero.

Match

Match the graph to the correct description.

Stationary

Constant speed away

Constant speed towards

• Stationary

• Constant speed away

• Constant speed towards

Slope: the steepness of a line

Higher slope (steeper) = faster

Stationary

Constant speed

Slower (less
steep) &
towards

Faster (more steep)
& away

Multiple Choice

Which section of the graph has the highest constant speed?

• 0-5 minutes

• 5-10 minutes

• 10-15 minutes

• 15-10 minutes

Match

Juan rides his bike to his friend's house and then home. Match the descriptions of his journey to the matching part of the graph.

• Juan rides his bike at a constant speed from home to his friend's house.

• Juan is at his friend's house.

• Juan rides his bike at a constant speed from his friends house back home.

• Juan starts at home.

• Juan is back home.

8:00-9:30

9:30-13:30

13:30-15:30

8:00

15:30

• 8:00-9:30

• 9:30-13:30

• 13:30-15:30

• 8:00

• 15:30

Unit 4

Investigating Balanced and Unbalanced Forces

Unit 4 Vocabulary

● Force: a push or pull

upon an object.

● Net Force: The

combination of all forces
acting on an object.

Multiple Choice

What direction is the net force going in this diagram?

• Up

• Down

• Left

• Right

Unit 4 Vocabulary Cont.

● Balanced Forces: equal

and opposite forces
acting on an object (net
force = 0). Cause no
change in position or
motion.

Unit 4 Vocabulary Cont.

● Unbalanced forces:

unequal forces acting on
an object (net force
＞0). Cause change in
position or motion.

Multiple Choice

Are the forces in the diagram balanced or unbalanced?

• Balanced

• Unbalanced

• Forces cannot be determined

Multiple Select

Select all diagrams that show unbalanced forces.

Unit 4 Vocabulary Cont.

● Gravity: a force that

pulls objects towards the
earth.

● Friction: a force that

opposes motion.

Multiple Choice

Which of the following has the lowest friction?

• Carpet

• Grass

• Wood

• Ice