## How does cube size affect the rate of diffusion?

As the cube size increases, the surface-area-to-volume ratio decreases (click to enlarge the table below). The vinegar can only enter the cube through its surface, so as that ratio decreases, the time it takes for diffusion to occur throughout the whole volume increases significantly.

## How do you find the rate of diffusion of a cube?

Calculating % diffusion in each cube: (That is, calculate total volume of the small portion of the cube that did not turn pink – use the same formula L x W x H) Calculate volume diffused = total volume – volume not pink. Calculate % diffusion = Volume diffused /total volume x 100.

**What do the agar cubes represent in this lab?**

The agar cubes represent biological cells. The volume of the cube correlates to the cytoplasm and the surface area of each cube to the cell membrane. All living cells are dependent on diffusion processes for survival. These processes transport materials across the cell membrane into and out of the cell.

**What size cube is best for diffusion?**

The most effective will be the 4:1 ratio, cube C, because, as stated above, the larger ratios are the ones that with hold the most maximization for diffusion. The smaller the cell (bigger the ration) the more adequate it is to have substances moving in and out of it. 5.

### Which of the cubes is the most effective at maximizing diffusion?

The 4:1 cube is going to be the most effective at maximizing diffusion because it has the highest ratio, similarly to the 1cm cube in our lab.

### Which cube has the fastest diffusion rate?

13. Circle the cube that has the faster rate of diffusion – circle both if the rates are the same: a big cube or a small cube – both dropped into the same temp / concentration of vinegar….

Surface Area : Volume ratio | Length of side of a cube (cm) |
---|---|

6 | 1 |

3 | 2 |

2 | 3 |

1.5 | 4 |

**How do you calculate the rate of diffusion biology?**

Diffusion Rate Calculator

- Formula. R2 = R1 / [Sqrt(M2/M1)]
- Diffusion Rate of Gas 1.
- Molar Mass of Gas 1.
- Molar Mass of Gas 2.

**How do you make an agar cube for diffusion lab?**

Agar Cubes (Preparation)

- Prepare a 2% solution of agar. Mix 20 g of agar with 1 L of distilled water.
- Heat almost to a boil. Stir frequently until solution is clear.
- Remove from heat and add 10 mL of 1% phenolphthalein solution.
- Pour agar into a shallow tray to a depth of 3 cm and allow it to set (over night).

## What substance was diffusing out of the agar cubes?

There is evidence that something diffused out of the agar since the clear sodium hydroxide solution into which the agar cubes were placed turned purple from the phenolphthalein diffusing out of the agar cube.

## What size cube would make a more efficient cell?

The cube that will be most effective at maximizing diffusion will be the cube that has a surface to volume ratio of 4:1 because it has a higher surface area to volume ratio so it is more efficient.

**Why does sodium hydroxide diffuse into the cube?**

We know the sodium hydroxide diffuses into the agar cube because the cube turned purple as it entered the cube containing the phenolphthalein, an indicator of base.

**Which shape has the fastest diffusion time?**

Explanation: The sphere is the fastest because it has the highest surface area. The cylinder has the second highest, and the cube has the lowest. The greater the surface area, the faster the rate of diffusion.