Unit 2 Review

Determine the Precision of the Instrument

Each line is called an increment.
The value given to the distance between the two line.
The smaller that value the more precise the instrument is.

​

What is the value of each line?

The larger number (1.5cm) - the smaller number (1.0 cm) ÷ the number of lines between those two numbers (5)
.5/5=
0.1 cm= each line equals

​

​Calculate the value of the increment

Draw

Calculate the value of each line, using the graduated cyliner.

Reorder

You are given a chunk of metal that is said to be pure gold. You know the density of gold is 19.3 g/ml. You measure the mass of the metal and it has a mass of 176.8 g. Put the steps in order that would you need to take to determine if the sample is gold.

• Fill a graduated cylinder with water and record the initial volume.

• Put the sample in the graduated cylinder.

• Record the finial volume with the sample and the the water.

• Subtract the 2 values. The final value from the initial value

• Calculate the density of the sample and compare it with gold's density.

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Drag and Drop

The ​

Placeholder

precise an instrument is, the ​

Placeholder

incremental value (the distance between the two lines).

Drag these tiles and drop them in the correct blank above

more

smaller

Closer

Further

DENSITY

​Water displacement method

Fill in the Blanks

Draw

A cube is 5.0 cm on each edge. What is its density, if the mass is 257.3 g?

Answer in to the tenth. Your answer must have units. Show your work

Draw

Calculate the value of each line, using the graduated cyliner.

Estimating Numbers
24.5 ml

Numbers that come from your measurements must include:
1. the number you are 100% certain of
2. the estimated number
3. units

The estimated number is ALWAYS your last number.

Your estimated number is always one place value less than your known number (one less than your incremental value).

​Each line = 100-50/5 =10 ml
Your estimated number can only go to the ones place.
I'm Sure there is 80ml, however, I'm am estimating to the ones. 85mL

Measurement is close to the "actual value"

Accurate

Measurements are close to each other.

Precise

How close is your measurement?

How much error in your measurement?

​Experimental value can be called: Known, accepted, theoretical.

Multiple Choice

How close a measurement is to the accepted value is called:

• Accuracy

• Precision

• Error

Multiple Choice

Which student had the MOST ACCURATE results?

• Ash

• Casey

• Blake

Math Response

What is the average of for Casey?

Type answer here

Correct Answer: \left(6.89+10.89+5.89\right)\div3=7.89

Deg^°

Rad

Math Response

What is Casey's Percent error?

Type answer here

Correct Answer: \frac{7.89-7.89}{7.89}\times100=0

Deg^°

Rad

Multiple Choice

Which student's data is the MOST ACCURATE?

• Student A
• Student B
• Student C

Open Ended

What is student B percent error? Round to the 100th.

Multiple Choice

Which best describes the target?

• Precise, but not accurate

• Accurate but not precise

• Precise and accurate

Dropdown

The measurement of the blue line:

for ruler 1 is ​

Select answer

the estimated value is to the ​

Select answer

.

ruler 2 is​

Select answer

The estimated value is to the ​

Select answer

rule 3 is ​

Select answer

the estimated value is to the tenths.

Multiple Choice

Which ruler would be considered the most precise ruler?

• 1

• 2

• 3

• 4

Dropdown

Ruler 2 measures the paper clip at​

Select answer

the estimate value is ​at the

Select answer

Ruler 4 measures the paper clip at ​

Select answer

the estimated value is at the ​

Select answer

.

Draw

What is the volume of the battery?

Show your work on the board.

Include: Known value, estimated value and units.

Multiple Choice

How much liquid is the graduated cylinder?

• 30.5 mL

• 35.5 mL

• 36.5 mL

• 36.0 mL

Categorize

Options (8)

Made of atoms

Makes up matter

Made of 2 or more atoms

Makes things move

Organize these options into the right categories

Matter

Atoms

Molecules/Compound

Energy

Physical or Chemical Change?

​Physical Changes

These changes do not involve changing the substances chemical composition.
At the conclusion of a physical change you still have the same substance it only looks different.

Melting
Dissolving
Mixing
Ripping
Tearing
Cutting

​

Key Words to look for when determining if its a physical change.

Gas forms or bubbles

Chang in temperature without adding/removing heat
Change in color or odor
Formation of a precipitate: solid

Indicators of Chemical change.

Multiple Choice

• physical change

• chemical change

Multiple Choice

• physical change

• chemical change

Multiple Choice

• physical change

• chemical change

Multiple Choice

Is bleaching your hair a physical or chemical change?

• physical change

• chemical change

Multiple Choice

Is corroding metal a chemical or physical change?

• physical change

• chemical change

Multiple Choice

Are fireworks exploding a physical or chemical change?

• physical change

• chemical change

Multiple Choice

Is cream being whipped a physical or chemical change?

• physical change
• chemical change

Multiple Choice

Is toasting a piece of bread a chemical or physical change?

• physical change

• chemical change

Multiple Choice

Is moldy cheese a chemical or physical change?

• physical change

• chemical change

Multiple Choice

Is glass breaking a chemical or physical change?

• physical change
• chemical change

Review Questions

Categorize

Options (10)

Shiny

pH above 7

Alkaline

Conducts electricity

Dull

Brittle

Insulator

pH below 7

Acidic

Reacts with acid

Categorize the following Physical and Chemical properties as belonging to Metals or Nonmetals

Metals

Nonmetals

Multiple Choice

Between what two points is the most energy being added to cause a phase change?

• A -B
• B-C
• C-D
• D-E

Multiple Choice

Thermal Energy, also known as heat, flows from …

• Hot objects to hotter objects.

• Cooler objects to warmer objects.

• Warmer objects to hotter objects.

• Warmer objects to cooler objects

Multiple Choice

Which best describes the target?

• Precise, but not accurate

• Accurate but not precise

• Precise and accurate

Match

Match the parts of the graph with the correct label

• Title

• Independent variable

• Dependent variable

• 1 Chirp/Degree F

Cricket Chirps vs. Temperature

Number of Chirps

Temperature

Slope

• Cricket Chirps vs. Temperature

• Number of Chirps

• Temperature

• Slope

Multiple Select

What type of physical property is being shown in the picture?

What type of elements exhibit this property?

• Ductile

• Brittle

• Sulfur

• Copper

Open Ended

1. A. What is the slope of the line? Your answer needs to include the units of measurement.

$$\left(y_2-y_1\right)\div\left(x_2-x_1\right)$$

Multiple Choice

Which prediction would prove this model correct?

• If energy is removed then the gas will condense to a liquid

• If energy is added the solid will melt to a liquid.

• If energy is added the chemical properties of the atom will change.