Chemistry Cheat Sheet

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Why do ionic bonds form between metals and nonmetals? --> metals form positive ions and nonmetals form negative ions. The positive ion is a cation and the negative is the anion. Nonpolar covalent bond vs polar covalent bond? due to electro negativities that affect how the atoms will share electrons. A non polar covalent bond has an electro negativity of .4 or less. A polar covalent has greater then .4 less 2 How many electrons must a calcium atom gain or lose? Calcium has to lose 2. It originally is at Ca2+ Why do some substances undergo chemical reactions and some do not? Bc of their electron configuration. If one substance has an unbalanced set of valance e- and so does another substance, then they will bond and each will have a complete set. The valance e- in the e- configuration determines if they will undergo chemical reactions. How can you tell whether a chemical equation is balanced? What principle is reflected in the balanced equation? If they have the same number of atoms on each side of the equation. Example: the equation couldn’t be balanced if there were 2 hydrogen atoms on 1 side and 4 on the other. The scientific principle that reflects the balanced equation is the law of conservation of matter. Matter cannot be created nor destroyed just like atoms cannot be either. You cant create an unbalanced number of atoms on one side or destroy one atom to make it balanced. Balanced equation for reaction where calcium nitride is formed from calcium and nitrogen? 3Ca+N2Ca3N2 Aluminum reacts with fluorine to produce aluminum fluoride. 2Al + 3F2 2AlF3 There are 2 Al’s and 6 F’s. 3Cl2+N22NCl3 ….Chlorine + nitrogen yields to nitrogen tri chloride. Name the compound with the formula (NH4)3PO4 Ammonium Phosphate Max number of Hydrogens = 8 picture

Carbon tetrachloride- 160 amu…sulfuric acid-98 amu…phosphorus pentoxide- 142 amu State the relationship between volume and number of moles of a gas? At the same temperature & pressure, equal volumes of gases...
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