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

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

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

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  H  Cl  Product Oxidation Numbers N  H  Cl    Is this a redox reaction?  If it is, what is element is oxidized? What element is reduced? What element is the oxidizing agent?  What is the reducing agent?   

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

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  Cu  S    O    Product Oxidation Numbers Cr    Cu  S    O    Is this a redox reaction?    If it is, what is element is oxidized?  What element is reduced?  What element is the oxidizing agent?    What is the reducing agent? 

The centromeres split during

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

Osteoporosis results from a __________ deficiency.

Decomposers _______________________________.