C) A voltaic cell consists of Zn/Zn2+ half-cell and a Ni2+/Ni half-cell at 25°C. i. What is the initial concentration if the initial concentration of Ni2+ and Zn2+ are
1.75 M and 0.15 M, respectively?
ii. What is the cell potential when the concentration of Ni2+ has fallen to 0.45 M?
ii.
What is the number mole of Zn2+ in 500 ml solution if Ecell is 0.6 V and [Ni2+]
is 2.8 M

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

•what conclusions can you make about the relationship between the volume of a gas and its temperature? • what conclusions can you make about the relationship between the volume of a gas and its pressure? • what possible variables have you not accounted for? as you did the procedures, is it possible that the atmospheric pressure may have changed? if it did change over the course of your experiment, then how would your results have been affected?

Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.