These two words are often confused by students. Here is the main difference:
- something rises (e.g. the price rose)
- somebody raises something (e.g. the company raised the price)
"Rise" (rose, risen) can be a verb or a noun. I often use it for IELTS writing task 1:
- The price of cigarettes rises every year. (verb, present)
- In 2008, the number of customers rose from 100 to 200. (verb, past)
- There has been a dramatic rise in Internet usage in the UK. (noun)
- In 2008, the UK saw a rise in the divorce rate. (noun)
"Raise" (raised) is almost always a verb. You probably won't use it for task 1:
- The Government raises the price of cigarettes every year.
- Charities work to raise the standard of living in developing countries.