An unknown sample was tested and found to have a unique melting point, colour,
hardness, and boiling point. It was then discovered that the sample could be broken down into
two simpler substances through a series of chemical reactions. What can you categorize this
sample as?
a) Element
b) Compound
c) Pure substance
d) Mixture

Earth's axis of rotation is tilted at an angle of 23.5 degrees. what is one change you would see on earth if its axis was not tilted?

In a ni-cd battery, a fully charged cell is composed of nickelic hydroxide. nickel is an element that has multiple oxidation states. assume the following proportions of the states: nickel charge proportions found 0 0.17 +2 0.3 +3 0.33 +4 0.5 (a) determine the mean of the nickel charge. enter the answer to 2 decimal places.(b) determine the cumulative distribution function of nickel charge.

How many moles of cu are needed to react with 5.8 moles of agno3? cu + 2 agno3 → cu(no3)2 + 2 ag