What happens during all chemical changes?

Select one:

A. Matter changes to a different phase.

B. Atoms rearrange to form new substances.

C. Protons turn into electrons.

D. Molecules split apart.

What is the smallest unit of an elemwntthat still has properties of that elemwnt

Spring scales are used to measure the weight of large or awkward items in what SI unit? A) centimeters B) degrees Celsius C) grams D) Newtons

Which statement is true about word equations with regards to chemical reactions? A. they provide the most accurate way of describing reactions B. they are recognizable by speakers of all languages C.

What change would occur in the kinetic energy of vapor if a container of vapor is placed at 0 Kelvin?

For this ionic compound, what would be the name of the anion? a. nitrite b. nitrate c. calcite d. sulfate

What is the mass of 4.6 moles of helium gas?

In the process of ionization, what is the relationship between the second ionization energy and the third ionization energy?

What are examples of convection?

Find the mass of 1 mole of cuprous oxide, or cu2o. assume the atomic mass of copper is 64 and oxygen is 16.

Ice (H2O) melting at 273 K and 1 atm has = 6.01 kJ/mol and = 6.01 kJ/mol while water vaporizing under the same conditions has = 37.6 kJ/mol and = 40.7 kJ/mol. Why is there such a large difference between and, but not for and?