All of the following show a periodic pattern except

a. the dog ate everyone of his play toys
b. the lawn is mowed every thursday
c. their are 12 months in ayear
d. their are 60 seconds in a minuite

Reaction rate depends on how many molecules are coming into contact with each other with enough energy to react. increasing the temperature of the reactants will increase -

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

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons