hem 107 PRACTICE EXAM II (10 pts) Give the formula or name as indicated below: c

Question

hem 107 PRACTICE EXAM II (10 pts) Give the formula or name as indicated below: carefully about which ones require Roman numerals! nk Formula NAME (Watch your spelling!) Formula h londe magnesium aceta ammonium nitrit calcium Cucio, "-Copper-IL. Chlarde N2Br Li S ypochlorite FeSO HPO sodium perchlorate hypochlorous acid (9 pts) Complete the table below: Remember that the nuclear symbol MUST show 4 pieces of information Atomic Number Mass Number Number ofNumber of Number of Neutrons Nuclear Symbol 32 15 Charge Protons Electrons 50 60 32 (2 pts) Consider S. How many protons does it have? Ans. How many electrons does it have? Ans. (2 pts) Which subatomic particles are found in the nucleus? Ans. (5 pts) Matching: Write the appropriate LETTER (from the list on the right) on the blanks provided: Note: Not all letters will be chosen Evidence that protons and neutrons are concentrated in a very small region of the atom. Two elements may combine to form different compounds A. Law of Conservation of Mass B. Proposal from Democritus&Leucippus; C. Discovery of Radioactivity D. Chadwick's Discovery of Neutrons Evidence that Dalton was incorrect in stating that E. Thomson's Cathode Ray Tube Experime all atoms of an element are identical. F. Rutherford's Gold Foil Experiment G. Law of Definite Proportion Evidence that all atoms contain the same identical, negatively charged particles. H. Law of Multiple Proportions

Explanation / Answer

Names of formula:

N2Br4 --> two nitrogen = dinitrogen, 4 bromine = tetrabormide --> Dinitrogen tetrabromide

Li2S --> Lithium + Sulf-ide --> Lithium sulfide

FeSO3 --> Fe+2 ion and SO3-2

Fe+2 = Iron (II) ; SO3-2 = Sulfite

Iron (II) Sulfite

H3PO4 --> H implies acidic, PO4-3 = phosphate

so

Phosphoric acid

Given name...

Magnesium acetate = Mg+2 and CH3COO-1 --> Mg(CH3COO)2

Ammonium nitrite -> NH4+ and NO2- --> NH4NO2

calcium --> Ca(s)

Sodium perchlorate --> sodium, Na+, per+ -ate suffix/prefix implies most oxidized state of Chlor- --> chlorine

Na+ + ClO4-

NaClO4

hypochlorous acid --> acid implies H+, hypo requires least oxidized state of Cl and Oxygen

then

HClO

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