Intro to the Mole Gizmo

Gizmo: Intro to the Mole

You will click on this link to go to the gizmo. Then click "Have a class code?" Enter the class code (choose the correct code to the right) and then login. ONLY click "create new account" if you tried to login and it didn't work. THEN click "launch" Mole

If you don't remember your login, click on your class period to the right. All logins are linked.

​Period 2:

Period 4

Period 5:

Period 6:

This is what you should see after logging in

Answer the questions on the next three slides

Open Ended

In the image there are a dozen donuts, a dozen eggs, and a dozen roses. How many of each item do you have?

Open Ended

Would a dozen of each object have the same mass?                 

Open Ended

For example, let’s say you have 12 carbon atoms, 12 gold atoms, and 12 iron atoms. Even though you have the same number of each, do you think they Would all have the same mass (weight)? Explain.

​Read the two short paragraphs below. The paragraph with the arrow pointing to it is the directions for what to do in gizmo. DO WHAT IT TELLS YOU TO.

Open Ended

Put the copper atom on the scale. What is the average mass of a copper atom?

Open Ended

Now we will try to see how many atoms are in a gram of copper. Use the larger balance on the right. Press “Add atoms” to put a scoop of atoms in the weighing dish. Keep adding until the balance shows a number between 1 and 2 grams. You can make the scoop size bigger by changing the exponent using the slider.  I RECOMMEND CHANGING THE EXPONENT TO 23

—> LOOK ABOVE THE SCALE WHERE IT SAYS TOTAL ATOMS. How many atoms did you add?

Open Ended

Now click "add atoms" until the two balances show the same number. How many atoms did you need to add until the two balances showed the same number?

Open Ended

How many atoms are in one mole?

Open Ended

What do you notice about the number of atoms in one mole compared to the number of atoms it took for the two balances to say the same number?

​Now change the element to "sulfur". Put the sulfur atom on the little scale. Then, put atoms on the larger scale (on the left) until they both show the same number

Open Ended

How many atoms of SULFUR did you need to add until the two balances showed the same number?

​READ THE PARAGRAPH BELOW

Open Ended

What is the exact value of the Avogadro constant?

(We will call it “avogadro’s number” in our class)

Draw

Avogadro’s number is below. Write it out in standard form. (You will need to move the decimal place to the right 23 times, so you will need to add a lot of zeros!)

​Read the paragraph below. Then answer the questions on the following slides

Fill in the Blank

Put a SULFUR atom on the scale. The number on the scale is the atomic mass. IT IS THE SAME AS THE MOLAR MASS

The atomic mass of sulfur is _____

The molar mass of sulfur is _____

Fill in the Blank

Put an ALUMINUM atom on the scale. The number on the scale is the atomic mass. IT IS THE SAME AS THE MOLAR MASS

The atomic mass of aluminum is _____

The molar mass of aluminum is _____

​Experiment: Select Copper(I) oxide, Cu₂O. Note that Cu₂O is a compound composed two copper atoms and one oxygen atom bonded together. Place the Cu₂O molecule on the nano-balance.

​STOP HERE FOR TODAY

Fill in the Blank

The molecular mass of Cu₂O is ____

Fill in the Blank

Add molecules to the larger balance until its reading matches that of the nano-balance exactly. How many molecules did you need to add?

Fill in the Blank

Repeat the above procedure with another molecule of your choice. How many molecules did you need to add?

Match

Complete the following statements:

• 1 mole of any ELEMENT contains 6.0221 × 10²³ ____

• 1 mole of any COMPOUND contains 6.0221 × 10²³ _____

• Compounds are atoms that are ____ together

atoms

molecules

bonded

• atoms

• molecules

• bonded

​ For compounds, it is sometimes necessary to calculate the number of atoms of each element within a molecule. Select Iron(II) chloride. Note the image of the molecule.

Fill in the Blank

How many Fe ATOMS are in an FeCl₂ molecule?

Fill in the Blank

How many Cl ATOMS are in an FeCl₂ molecule?

Fill in the Blank

Use the nano-balance to find the mass of each of these atoms

The mass of an Fe atom is ____

The mass of a Cl atom is ____

Fill in the Blank

Add together the mass of ONE Fe atom (55.845u) and TWO Cl atoms (remember EACH Cl atom weighs 35.453u)

Fill in the Blank

Place the FeCl₂ molecule on the balance. Is the number on the scale the same as what you got when you added the masses together on the previous slide?