Scientific knowledge is based on A. observations and inferences. B. hypotheses and doubt. C. political and social views. D. bias and opinions.

Which metal will produce h2 gas when added to a solution containing a strong acid?

What carries more information low frequency radio waves or high frequency waves

A student intended to make a salt solution with a concentration of 10.0grams of solute per liter of solution. When the student's solution wasanalyzed, it was found to contain 8.90 grams of solute per liter of solution.

What mineral is the hardest known substance in nature?

Elements are classified by their?

Ionic compounds are formed by the ... of electrons? by the what?

What is it called when energy is created without oxygen?

If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 Kelvin and 1.40 atmospheres? Show all of the work used to solve this problem. 2Li (s) + 2H2O (l) - > 2LiOH (aq) + H2 (g)

How did coroners handle their responsibilities in the early 1900s? Why was there a need for significant change in the job?

Which of the following is the best indication that a chemical change has taken place? a. The matter changes color. b. A mixture separates into layers. c. The change is reversible. d. The shape of the substance changes.