PhET Activity for MS-PS1-1: Build a molecule

DIRECTIONS:
1. You should be on the simulation's starting screen, which presents three modes.
2. Click on the 'Single' mode button on the left side of the screen to begin.
3. Observe the layout. You will see atom bins at the bottom, a workspace in the middle, and a 'Your Molecules' panel on the right.
Spend 2-3 minutes exploring the simulation. Drag different atoms from the bins into the workspace. Try snapping them together and pulling them apart. Don't worry about building anything specific yet, just get a feel for the controls.

QUESTION: Are you acquainted with the tools in this simulation?

DIRECTIONS:
1. Ensure you are in 'Single' mode, Collection 1.
2. Drag two Hydrogen (H) atoms from the bin at the bottom into the workspace.
3. Snap the two Hydrogen atoms together until they form a molecule and it appears in the 'Your Molecules' panel on the right.

QUESTION: A molecule of hydrogen (H₂) is made of:

DIRECTIONS:
1. Click orange reset button.

2. In the workspace, drag two Hydrogen (H) atoms and one Oxygen (O) atom from the bins.
3. Arrange and snap the atoms together to form a water molecule. Then move it to the 'Your Molecules' panel when correct.

QUESTION: The chemical formula for water is H₂O. This means it is made of ___ hydrogen atom(s) and ___ oxygen atom(s).

(a)  

DIRECTIONS:
1. Locate the water molecule (H₂O) in your collection panel on the right.
2. Click the '3D' button that appears next to its name.
3. In the pop-up window, click and drag the molecule to rotate it.

QUESTION: Describe the shape of the water molecule you are observing in the 3D view. Is it a straight line or is it bent? Why do you think it has this shape?

DIRECTIONS:
1. Click the 'X' in the top right of the 3D view window to close it.
2. Drag two Oxygen (O) atoms into the workspace and snap them together to form a molecule of oxygen (O₂).

QUESTION: Both hydrogen (H₂) and oxygen (O₂) molecules are composed of (a)   .

DIRECTIONS:
1. In the atom bins at the bottom, click the right arrow to find the Carbon (C) atom bin.
2. Drag one Carbon (C) atom and two Oxygen (O) atoms into the workspace.
3. Snap the atoms together to form a carbon dioxide molecule (CO₂).

QUESTION: How many total atoms are in one molecule of carbon dioxide (CO₂)?

DIRECTIONS:
1. In your collection panel, click the '3D' button next to carbon dioxide (CO₂).
2. Rotate the model and observe its shape.

QUESTION: How is the shape of the carbon dioxide (CO₂) molecule different from the water (H₂O) molecule? Describe the arrangement of atoms in CO₂.

DIRECTIONS:
1. While the 3D view for CO₂ is open, locate the two model toggle buttons at the bottom of the pop-up window.
2. Click the 'space-filling' model button (the one on the right).
3. Switch back and forth between the 'ball-and-stick' and 'space-filling' models.

QUESTION: The ___ model shows bonds as sticks and is good for seeing angles, while the ___ model represents the space atoms take up and is closer to how a molecule might 'look'.

(a)  

DIRECTIONS:
1. Close the 3D view window.
2. Click the right arrow in the atom bins to find the Nitrogen (N) bin.
3. Drag two Nitrogen (N) atoms into the workspace and snap them together to form N₂.
4. A pop-up should appear saying you completed the collection.

QUESTION: Match the molecule name to its correct chemical formula.

DIRECTIONS:
1. Click the orange reset button.

2. 2. Drag two Hydrogen (H) atoms and two Oxygen (O) atoms into the workspace.
   3. Connect them to form a hydrogen peroxide molecule (H₂O₂).
   
   QUESTION: Both water (H₂O) and hydrogen peroxide (H₂O₂) are made of hydrogen and oxygen, but they are different substances because they have a different (a)   .