Which of the following is not a pure substance an element, molecule, compound, or mixture?

Phenylalanine hydroxylase is an enzyme that participates in the reaction to form tyrosine from phenylalanine. What problem would people have if they do not have this enzyme?

Which phrase best matches the definition of the term constellation? A. a group of stars that are nearby B. a group of stars that has a name C. a group of stars that are unknown D. a group of stars invisible to the naked eye

Which element does not combine with sulfur? A. F B. G C. H D. K E. All can combine?

An example of a chemical change is burning a wood log to give a pile of ashes. O True O False

When a wave encounters a large gapless barrier which of the following describes what will happen

In Flask A, you reacted 7.23 g Mg with 1.05 mol HCl. In Flask B, you reacted 1.22 g Mg with 1.35 mol HCl. Which balloon will inflate the most?

I have 2 electrons is the first shell, 8 in the second, and 6 in the third

The production of plastics makes life, so it benefits society. On the other hand, the production of plastics causes air and water, so it also harms society.

The total number of moles represented by 20 grams of CaCO3 is

Particles of matter how have both potential and kinetic energy is that true or false?