Видео 113
Просмотров 675 583

1:58

Potometer Setup Demo

2:30

Transpiration Time-Lapse

0:26

The Effect of Temperature on Enzyme Activity

5:27

Electrophilic Addition

1:33

Elimination Reaction Summary

0:33

Demonstrating the Evolution of Carbon Dioxide by Living Organisims

This video presents an experiment demonstrating the evolution of carbon dioxide by living organisms. Sodium hydrogen carbonate indicator is used to show that carbon dioxide is released by living morio worms.
Sodium hydrogen carbonate, also known as hydrogencarbonate indicator, is a pH indicator that detects changes in carbon dioxide concentration. It is commonly used in experiments studying photosynthesis and respiration. The indicator appears red under normal carbon dioxide levels, turns yellow when carbon dioxide levels increase, and becomes purple when they decrease.

Видео

1:58

Potometer Run

Просмотров 82 месяца назад

This video demonstrates how to use a potometer to measure the rate of transpiration in a leaf.

2:30

Potometer Setup Demo

Просмотров 52 месяца назад

This video demonstrates how to set up a potometer, a device used to measure the rate of water uptake by a leaf, which is nearly equal to the water lost through transpiration.

0:26

Transpiration Time-Lapse

Просмотров 122 месяца назад

This video presents 18 hours of time-lapse footage demonstrating transpiration through plant tissues.

The Effect of Temperature on Enzyme Activity

5:27

The Effect of Temperature on Enzyme Activity

Просмотров 222 месяца назад

An experiment demonstrating how temperature affects the rate at which trypsin catalyses the breakdown of casein in milk.

1:33

Electrophilic Addition

Просмотров 122 месяца назад

This video features a stop-motion animation illustrating the mechanism of the electrophilic addition reaction between bromine (Br₂) and an alkene.

0:33

Elimination Reaction Summary

Просмотров 434 месяца назад

A stop-motion animation that explains the elimination mechanism. This is part of the AQA A-level Chemistry course. This typically occurs for primary or secondary haloalkanes in the presence of a strong base. Technically, this is called an 'E2 elimination' because the rate-determining step involves two molecules: a haloalkane and a hydroxide ion. Tertiary haloalkanes often undergo an alternative...

3:12

The effect of pH on enzyme activity

Просмотров 214 месяца назад

A demonstration to show the effect of pH on enzyme activity.

1:51

Cadet Field Gun Run

Просмотров 1206 месяцев назад

A useful animation showing the sequence of events during a cadet field gun competition.

15:08

VSEPR Theory: 12 Shapes to Remember

Просмотров 587 месяцев назад

VSEPR stands for 'valence shell electron pair repulsion theory.' This video goes through the 12 key examples that students should remember for A-level Chemistry. 2 electron pairs: 2 bp 0 lp : 00:13 3 electron pairs: 3 bp 0 lp : 00:47 4 electron pairs: 4 bp 0 lp : 01:15 3 bp 1 lp : 02:05 2 bp 2 lp : 03:51 5 electron pairs: 5 bp 0 lp : 06:15 4 bp 1 lp : 07:26 3 bp 2 lp : 08:37 2 bp 3 lp : 10:05 6...

12:45

Uncertainty Calculations

Просмотров 689 месяцев назад

This video explains the following: 1. The difference between absolute and percentage uncertainty. 2. How to calculate absolute uncertainties. 3. How to combine (propagate) absolute uncertainties using percentage uncertainties. 4. How to calculate the absolute uncertainty in the final answer. 5. How to discuss the error in the final answer.

15:31

Arrhenius Question

Просмотров 90Год назад

A video walk-through of a classic A-level Chemistry question about the Arrhenius equation. Students have to plot a graph of ln k against 1/T to calculate the value of the activation energy. The activation energy is always a positive number and often lies between 50-250 kJ/mol.

4:54

Maxwell Boltzmann Simulation

Просмотров 282Год назад

In this video, we showcase a Maxwell-Boltzmann distribution simulation that demonstrates the probability distribution of the kinetic energies of identical particles in a gas. Through the use of advanced algorithms and graphical representations, we visually represent the behavior of gas particles and how it changes with temperature.

15:53

Multi-step Moles Calculation

Просмотров 1,7 тыс.Год назад

A video walk-through of a challenging 7 mark AQA A-level Chemistry question from paper 1 (June 2018). A student added 627 mg of hydrated sodium carbonate (Na2CO3.xH2O) to 200 cm3 of 0.250 mol/dm3 hydrochloric acid in a beaker and stirred the mixture. After the reaction was complete, the resulting solution was transferred to a volumetric flask, made up to 250 cm3 with deionised water and mixed t...