ok i did those questions COMPLETELY different.
for the colloid one i said to actually complete the experiment - when it turns from a smooth consistency to one of oil on the top (from colloid to suspension) you have gone too far.. basically i said it was a guess and check thing... i felt so smart when i did the test now i feel like an idiot.
for the timeline one i did RADIO and INTERNET
radio impacted society because it was a new form of communication
two way radio led to the discovery of the telephone
used in wars etc
internet is an impact
ppl can work from home
form of communication
site of information
also problems with hacking and exercise levels dropping
the colloid prac HAPPENINGCHICK described sounded ok but it would be hard to shine light through a colloid of mayonnaise because it is so thick. i doubt the light would penetrate muchat all.. wen we did the experiment we did a colloid of chemicals - not food products.. dont know whats goin on really lol