Which if the following is true about scientific theory? a. a theory is a proposed explanation for a hypothesisb. a theory can be formed after a single experimentc. a theory can be changed to explain new observations or experimental resultsd. a theory can never be changed

How do the energy differences between the higher energy levels of an atom compare with the energy difference between the lower energy level of the atom

A+b→2c when the reaction begins, the researcher records that the rate of reaction is such that 1 mole of a is consumed per minute. after making changes to the reaction, the researcher notes that 2 moles of a are consumed per minute. what change could the researcher have made to effect this change?

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons