Why not try writing up one the experiments below as a proper science report?
How to write up a science experiment
Aim - what do you want to learn from this experiment?
Hypothesis - what do you think will happen?
Safety - how are you going to ensure everyone (not just you!) stays safe?
Method - what are you going to do? Write a step-by-step 'recipe'
Results - what happened? (Usually drawn in a table)
Conclusion - what did you learn from your experiment?
Evaluation - if you were to do this again, how would you do it better?
Sugar Yeast experiment
What was the one thing that was different in each of the bottles?
How did you measure to check the different results?
What do you need to make sure you keep the same? (this makes the test fair!)
What happened?
Find out why!
Bubble in a bubble experiment
Did you make it work first time?
If you didn't, what kind of things did you try to make it work better the next time?
This is called evaluating!
Sugar rainbow
Why do the different colours sit in layers?
See if you can find out!
Lava lamp
You don't strictly need the torch to do this (or to use quite as much oil!) Why not try on a much smaller scale to save resources? Don't forget never to pour oil down the sink as it will clog it!
How do you think this works? Try to find out!
Red Cabbage indicator
You don't need a blender for this, you could just cook the cabbage for a few minutes (for dinner!) and use the liquid as your indicator.
What colour does the indicator go with acidic things (like vinegar?) What about alkaline things like baking soda? What else could you test?
Rocket
Try to find out why this works!
Fire-resistant water balloon
Why doesn't the balloon burst when there's water inside? Try to find out!
Chain reaction
Why do the sticks seem to explode everywhere when you let go?
Coke and mentos
Do outside!
What causes the cola to become a geyser?
Inseparable books
Why won't the books separate?
The science to all of these experiments is in the video description!