Levi is conducting a comparative experiment where he is comparing the average temperature in cities and nearby rural areas. he finds that cities are on average one degree warmer than rural areas. what is a major limitation of his experiment? a) large amounts of information can be gathered. b) it is repeatable. c) he can not definitively show what causes the difference. d) there is an independent variable and a dependent variable.

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

Why do oxygen have a strong attractive force for electrons

Idid a lab for chemistry where we put nails in a copper (ii) chloride solution. 1. why did the reaction stop? which reactant was used up? how do you know? 2. describe what was happening to the atoms of iron and copper during the reaction. what is this type of reaction called? 3. what would happen to the ratio of copper to iron if you had placed more nails in the beaker? if you had let the reaction go for less time? 4. what is the accepted ratio of copper atoms to iron atoms in this reaction? account for differences between your experimental value and the accepted value. write the balanced equation for the reaction.