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Write the name for the elements that fit the following descriptions. 79 protons in the nucleus of each atom  [red1] 24 electrons in each uncharged atom  [red2] 80 electrons in each +3 cation   [red3] 10 electrons in each -2 anion [red4]

Balance the following equation. Don’t leave any blocks blank – enter a 1 where appropriate.   [dog1] MgCl2   + [dog2]K  –> [dog3] KCl + [dog4] Mg

Write the name of the element that fits the following descriptions. The noble gas in the fourth period [answ1] The alkaline earth metal in the third period [answ2] The representative element in group 3A and the third period [answ3] The metalloid in the second period  [answ4]

Write the chemical formula for a compound made from one carbon atom and one oxygen atom. Name the compound. Formula  [blue7] Name [blue8] Is it an ionic or molecular compound?  [blue9]

For the following equation determine the oxidation number for each atom in the equation and identify whether the reaction is a redox reaction or not (yes or no). Remember to a + before positive charges and a – before negative charges. If the reaction is redox, identify what is oxidized, what is reduced, the oxidizing agent, and the reducing agent. If it is not a redox reaction put NA in the remaining answers. HCl + NH3 –> NH4Cl Reactants Oxidation Numbers: N  [blue1] H  [blue2] Cl  [blue3] Product Oxidation Numbers N  [blue4] H  [blue5] Cl   [blue6] Is this a redox reaction?  [blue7] If it is, what is element is oxidized? [blue8] What element is reduced? [blue9] What element is the oxidizing agent?  [blue10] What is the reducing agent?   [blue11]

For the following equation determine the oxidation number for each atom in the equation and identify whether the reaction is a redox reaction or not (yes or no). Remember to a + before positive charges and a – before negative charges. If the reaction is redox, identify what is oxidized, what is reduced, the oxidizing agent, and the reducing agent. If it is not a redox reaction put NA in the remaining answers. 2Cr + 3CuSO4 –> Cr2(SO4)3 + 3Cu Reactants Oxidation Numbers: Cr  [fay1] Cu  [fay2] S    [fay3] O   [fay4] Product Oxidation Numbers Cr   [fay5] Cu  [fay6] S    [fay7] O   [fay8] Is this a redox reaction?   [fay9] If it is, what is element is oxidized?  [fay10] What element is reduced?  [fay11] What element is the oxidizing agent?   [fay12] What is the reducing agent?  [fay13]

The centromeres split during

The tundra, boreal forest and tropical savanna are all _______.

Osteoporosis results from a __________ deficiency.

Decomposers _______________________________.