Which two reactions are faster than the others? O A. Black powder in fireworks burns explosively to produce gases and
white light.
O B. Iron metal reacts with oxygen in air to form rust.
O C. Silver tarnishes in air that contains hydrogen sulfide.
D. Lead nitrate and potassium iodide react to form a yellow
precipitate.

25pts the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

While preforming an experiment involving a reaction between two chemicals the scientist observes that the reaction container has become warm the observation is an example of