Two unknown household items are being tested with litmus paper. Substance A turns red litmus paper blue and Substance B turns blue litmus paper red. Which of the following best explains the results of the experiment?
a. Substance A is an acid and Substance B is a base.
b. Substance A is a base and Substance B is an acid.
c. Both Substances A and B are acids.
d. Both Substances A and B are bases.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory

Which of the following would not diffuse through the plasma membrane by means of simple diffusion? 1 oxygen 2 glucose 3 a steroid hormone 4 a lipid soluble vitamin