As a reaction proceeds, one mole of reactant equals:

a) three units of a balanced chemical equation

b) two units of a balanced chemical equation

c) four units of a balanced chemical equation

d) one unit of a balanced chemical equation

Energy is released during which phase changes? check all that apply. boiling condensing depositing freezing melting subliming

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils