Choose all the answers that apply. Check the statements that are true.

- A hypothesis must be proven true in order for an experiment to be valid.
- Electrons and protons are examples of cycles.
- A valid experiment must have results that can be repeated.
- Observations are the final stage of an experiment.
- Science is based on fact

Select all that apply

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.

What is the equation for calculating rf values