Asigna el nombre tradicional a los siguientes hidróxidos a. Au(OH)3
b. Ba(OH)2
c. Hg(OH)2
d. V(OH)3
e. Nb(OH)5

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Chromosome 17 is made of over million base pairs.