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Chemistry

QuestionAnswer
the atomic number is equal to what? the protons and electrons
why do the elements Na and K have the same chemical properties? because they are in the same chemical family (alkali)
how many periods does the periodic table have? 7
what does the atomic mass represent? the neutrons and protons
what are the 3 ways that an atom can acquire a valence shell like the valence shell of its closest noble gas? give take or share electrons
define anion negitive ion
define cation positive ion
which elements are found around the staircase of the periodic table and why are the special they are metaloids and they are special because they have properties that ore metal and non-metal
what is the difference between Ca and Ca2+ Ca is neutral while Ca2+ needs to give away to electrons
define ionic compounds when a non metal and a metal form a5235 bond
give 3 examples of ionic bonding KCl, NaCl, NaF
what are the written forms of; MgO, K2O, BeCl2, Al2S3, AlCl3, Cu2O, CuO Magnesium oxide, Potassium oxide, Beriliyum chloride, Aluminum sulphide, aluminum chloride, copper (II) oxide, Copper (I) oxide
what is the correct written formula of Fe2O3, Iron (III) oxide
what is the correct formula for chromium (III) oxide Cr2O3
what is the formula for mercury (I) chloride HgCl
define endothermic and exothermic endothermic reactions are reactions that take in or require energy and exothermicis when are reactions that give off energy
what does 7 on the Ph scale mean the substance is neutral
what does 0-6 on the Ph scale mean the substance is an acid
what does 8-14 mean on the Ph scale mean it mean that that substances is a base
Created by: RyMo
 

 



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