Jojo and Barbara put a beaker of water into the freezer and take it out 24 hours later to find a solid. What is this an example of?

A. chemical change

B. transmutated inverse reaction

C. physical change

D. sublimation

Which of the following trends is indirectly proportional to effective nuclear charge, Zeff -ionization energy -electron affinity -atomic size -all answers are correct

Which of these correctly defines the pOH of a solution? a. pOH=log[H3O ] b. pOH=-log[H30 ] c. pOH=log[OH-] d. pOH=-log[OH-]

Which of the following is the most wasteful use of water? taking a shower rather than a bath watering the garden with recycled water running dishwashers before they are completely full replacing high-flow showerheads with low-flow showerheads

When preparing the diazonium salt, the solution is tested with potassium iodide-starch paper. a positive test is the immediate formation of a blue color. what is the ki-starch paper testing for? explain?

Which of the following bonds is most popular? C-C, C-N, C-O, C-H

Henry Moseley used X-ray experiments to determine the atomic number of elements. How did his discovery contribute to the development of the periodic table? A. It confirmed that elements should be arranged in strict order of increasing atomic mass. B.

Does pollution stay in the city where it originates

Cao (s) + h2o (l) = ca (oh) 2 (s) what mass of slaked lime can be produced from a mixture of 28.4 g of cao and 13.3g of h20

Which best describes the purpose of a controlled experiment describes the purpose of a controlled experiment?

What's the name for the phase change from solid to gas