Emma is doing a laboratory experiment to separate components of crude oil. She decides to use a technique that will separate the components based on their boiling points. Which technique uses this principle?
A filtration
B. distillation
OC centrifugation
OD. chromatography
E.
titration

The discovery that the universe appears to be expanding led to a widely accepted theory called a.) the big bang theory b.) the doppler effect c.) hubble’s law d.) solar nebular theory e.) the seyfert theory

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic