The difference between a scientific theory and other theories is that a scientific theory is supported by evidence and widely accepted. Which of the statements below is the best example of a scientific theory? Group of answer choices

A theory states if lightning strikes, then thunder will follow within 2 minutes

A group of many astronomers show support to the theory that the universe is expanding.

Dr. Leslie has a theory that it will rain tomorrow.

The theory that all animals are unhappy in the zoo, led to a study

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices

Some molecular compounds, such as hcl, ionize completely in solution. for molecular compounds such as h2co3, most molecules do not ionize in solution. which describes the properties of these two solutes? a. hcl and h2co3 have the same effect on the properties of the solution. b. hcl raises the freezing point of water more than h2co3 does. c. hcl raises the boiling point of water more than h2co3 does.

What is the mass in grams of 12.26 ml of acetone