Elements, Compounds, and Mixtures Classify each of the pictures below by placing the correct label in the blanks below: A= Element B= Compound C= Mixture of elements D= Mixture of compounds E= Mixture of elements and compounds Each circle represents an atom and each different color represents a different kind of atom. If two atoms are touching then they are bonded together. 8. 1) 3) 5) 6). 8 8) 9) 10) 11) 12) 13) 14) 15)

What would you multiply "atoms of oxygen" by to get the units "grams of oxygen"? atoms O (number) (number) (unit) (unit) )( (number) (number) (unit) (unit) = 90

Question 1 options: A. The Mole We will use the analogy of an elephant and its body parts to explore the concept of moles of compounds or elements. The elephant and the carbon tetrachloride, CCl4 molecule are the test cases. One elephant has one trunk and four legs One carbon tetrachloride molecule, CCl4, contains one carbon atom and four chlorine atoms 1 amu = 1.6606 x 10-24 g 1 dozen = 12 items 1 mole = 6.022 x 1023 items = Avogadro's Number Critical Thinking Questions: (Give your answers in terms of a number such as 17 or 3.25 x 1015 trunks)   1. How many trunks are found in one dozen elephants?

decide which element probably forms a compound with chlorine that has a chemical formula most and least similar to the chemical formula of the compound formed by chlorine and potassium

Number 63

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Mercury has an atomic number of 80 and an atomic mass of 200. Mercury has number of protons, number of electrons and number of neutrons. Mercury200, Mercury201 and Mercury202 , are isotopes, which means they contain the same number of , but different number of . If mercury loses two electrons, it will gain two charges.

Question 1 CLOZE 1 A chemical formula is a way of expressing information about the number of that are present in a chemical When these atoms combine, they form a ,the smallest unit of a compound. There are a number of elemental which represent the atoms in a chemical formula. The number of atoms of a particular element in a molecule is represented by a that is located to the of the element's symbol.

A cream contains 4.0% (by mass) lidocaine to relieve back pain. If a patient uses 17 grams of cream, how many milligrams of lidocaine are used? Your Answer: Answer units 18 Group 8A Group 1A 13 15 Group Group Group Group Group He SA 14 16 17 1 H Group 2A ЗА 4A 6A 7A 4.003 10 Ne 1.008 6 8 Li Be Transition elements 10.81 13 6.941 9.012 12 12.01 14.01 16.00 19.00 17 CI 20.18 18 Ar 11 14 15 16 Na Mg 3. 4 7 9. 10 11 12 Al Si 3 3B 4B 5B 6B 7B -8B 1B 2B 32.07 34 Se 39.95 26.98 31 Ga Ge As 28.09 32 35.45 35 Br 22.99 30.97 24.31 20 Ca 33 21 SC 19 22 23 24 25 26 27 28 29 30 Ti Cr Mn Fe Co Ni Cu Zn Kr 4 78.96 52 79.90 53 83.80 54 Хе 54.94 39.10 37 58.93 45 63.55 47 65.41 48 69.72 49 72.64 50 74.92 40.08 44.96 47.87 40 50.94 41 Zr Nb Mo 52.00 42 55.85 44 58.69 46 38 Rb Sr Tc Ru Rh Pd Ag Cd In Sn Sb Te 131.3 86 Rn 126.9 95.94 74 (99) 75 102.9 77 106.4 78 107.9 79 112.4 80 114.8 81 TI 121.8 83 127.6 84 Po 118.7 82 Pb 207 2 114 FI 85.47 55 87.62 56 Ba 88.91 57 La 91.22 72 Hf 92.91 73 101.1 76 85 6.…

The molecular mass of a compound containing 75.0 % carbon, 10.5 % hydrogen, and 14.6 % nitrogen is 384.6. Determine the molecular formula of this compound. a) How many carbon atoms are in the molecule? b) How many hydrogen atoms are in the molecule? c) How many nitrogen atoms are in the molecule?