2. When do chemical reactions happen?

O

When matter changes states

O

When water freezes into ice

O

When atoms gain, lose, or share electrons

O

When water boils

Which term names a metamorphic change in rocks over a wide area from tectonic forces in Earth's crust and mantle? A. local metamorphism B. regional metamorphism C. contact metamorphism D. thermal metamorphism

Estion 1 Most hypotheses of experiments are not accepted until other scientists verify the results. Which process occurs when one scientist carries out the same procedures used by another in order to verify the results? O A. repetition O B.

A gas has a volume of 750 mL at a pressure of 2.15 atm. What will the pressure be if the volume becomes 1.25 L?

At constant temperature and volume, a sample of oxygen gas is added to a sample of nitrogen gas. The pressure of the mixture is found by adding the pressures of the two individual gases.

What is the formula to sulfurous acid? H2S. HSO4. H2SO4. H2SO3.

Atoms - 1 2 3 4 Protons - 8 10 9 8 Neutrons - 10 9 9 11 Electrons - 8 10 9 8 Which two are isotopes of one another?

A radioactive isotope has the same number of protons as its stable parent atom, but differs in its number of what?

A student experimentally obtained the density of osmium the densest element as 22.57g/cm3 the density of osmium is reported to be 22.48 g/cm3 determine the student percent error

Great white sharks live in the waters around California and feed on seals. Changes in his ecosystem have caused the seal population to decrease. Which result is an adaptation by sharks when there are fewer seals to eat? A.

Which of the following changes occurs with the greatest increase in entropy?