Which element is a metalloid?
a. argon (ar)
b. silicon (si)
c. potassium (k)
d. magnesium (mg)?

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

One does not belong why? ice, gold ,wood ,diamond and table salt