Which of the following is required to change the state of matter?

addition or removal of heat

decrease in temperature

increase in temperature

addition or removal of energy

What numbers indicate an acid?

What is the purpose of a salt bridge in a voltaic cell consisting of separate breakers? Why is a salt bridge unnecessary in a single-breaker voltaic cell in which the compartments are separated by a porous divider?

The density of Fe is 7.87 g/cm^3. how many atoms present per cubic centimeter of Fe

In which orbital (s) are all the inner-shell electrons located in an atom of magnesium that is in the ground state?

How does the labrador current affect the climate of canada and greenland

Mixture's and solutions

What is half-life? a.) the time it takes for a radioactive atom to lose half its electrons b.) the time it takes for half of any number of radioactive atoms to decay c.) the average time it takes for any element to disappear completely d.

Water molecules are made of slightly positively charged hydrogen atoms and slightly negatively charged oxygen atoms. which force keeps water molecules stuck to one another?

Which can be used to prevent initial entry of bacteria into the body

Which statememt describes gravity? Select three options