Which scenario best describes a chemical change?

A. water conducting electricity

B. copper pipe being cut into pieces

C. copper corroding in the presence of oxygen

D. water freezing into ice

How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP?

Carbon dating advisable for measuring materials ages for a few years, thousands of years, millions of years

The sentence, "He won't never go to practice," is an example of what error? a. double comparison b. double negative c. double meaning

What do experts agree is the best nutrition for a newborn baby?

Which of the following would increase the dissolution rate of most solids in a liquid?

Since the early 2000s, careers in the field of genetics have grown at a rapid pace. Which of these is a probable cause for this explosion of available and expanding jobs?

How many litres of 0.215 m NaCl contains 4.30 mol of this salt? Assume this solvent is H2O I'm confused on this question because little m is molality but when I looked this up on google, someone solved the problem assuming it was molarity

How can a neutral atom become a positively-charged particle?

The last column of the periodic table contains the noble gases, elements that do not easily form chemical bonds.

When pollution is removed from the air by a natural process, it