Classify the following elements as halogens alkali metals alkaline earth metals, transition elements or inner transitional elements calcium, gold, iron, magnesium, plutonium, potassium, sodium and uranium

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o