Explain in your own words what empirical evidence is.

Why sodium is called active metal

For the reaction, calculate how many moles of the product form when 0.032 mol of K completely reacts. Assume that there is more than enough of the other reactant. 4K (s) + O2 (g) →2K2O (s) Express your answer using two significant figures.

If the coal is burned in a power plant that uses 2000 tons of coal per day, what mass of calcium oxide is required daily to eliminate the sulfur dioxide? How many grams of calcium sulfite are produced daily by this power plant?

Which is given as an example for how the paleozic supercontinent ice cap melted?

You wish to prepare an hc2h3o2 buffer with a ph of 4.34. if the pka of is 4.74, what ratio of c2h3o2/hc2h3o2 must you use?

How many milliliters of 1.50 M magnesium sulfate soulution is required to supply 2.50 mole of this salt?

What side does heat go on in an endothermic reaction?

Consider the chemical reaction represented below. CH4 + 2O2 CO2 + 2H2O + Heat Which of the following statements about this reaction is true? A. The reaction releases heat. B. Heat is absorbed by the reaction. C. The reaction releases oxygen. D.

Which phrase is a result of a scientific law? Daryl is a scientist at a research institute. He reviews articles written by other scientists. He conducts experiments after creating a hypothesis.

What are two elements that produce background radiation on earth and what do their decay equations look like?