Approximately for which year did Aristotle mention the theory of the 4 elements?

A blood pressure of 145 mm Hg is considered to be high and is generally a sign of hypertension. Determine what this pressure is in kilopascals.

What is the molecular formula for an oligosaccharide containing eight glucose monomers linked together by dehydration reactions?

Is it necessary to conserve energy if we are using biofuel? instead of diesal

Many substances are soluble in water. Which property of water makes this possible? A. water can dissolve a wide variety of substances B. water has the ability to cleanse itself through the water cycle C.

The carbon atoms in graphite and the carbon atoms in Diamond have different

12) _Na + _H2O → ___ NaOH + __H2

Match the mineral categories to their best descriptions. a. sulfide mineralsminerals that have a sulfur atom surrounded by four oxygen atomsb. sulfate mineralstable salt is an example of this type of mineralc.

A covalent bond is best described as Question 1 options: the sharing of electrons between atoms. the transfer of electrons. a bond between a metal and a nonmetal. a bond between a metal and a polyatomic ion.

If you have 100 grams of H2, how many moles of H2 is that?

Consider four elements from Group 7A: fluorine in the second period, chlorine in the third period, bromine in the fourth period, and iodine in the fifth period. Which element has the largest first ionization energy?