How many moles are in 8.73 times 10^25 atoms of boron, B? a) 3.84 times 10^27 mo

Question

How many moles are in 8.73 times 10^25 atoms of boron, B? a) 3.84 times 10^27 moles b) 5.04 times 10^-25 moles c) 1.45 moles d) 6.90 times 10^-3 moles e) 145 moles Which of these pairs of elements would be most likely to form an ionic compound? C and S Al and K Cl and Mg Cl and I Al and Mg Which of these elements exhibits chemical behavior similar to that of potassium? Chlorine sodium iron sulfur magnesium What is the coefficient of H_2O when the following equation is properly balanced with the smallest set of whole numbers? __ Al_4C_3 + ___ H_2O rightarrow ___ Al(OH)_3 + ___ CH_4 4 3 24 12 6 A piece of copper with a mass of 218 g has a heat capacity of 83.9 J/degree C. What is the specific heat of copper? 24.5 J/g middot degree C 0.385 J/g middot degree C 1.83 times 10^4 J/g middot degree C 2.60 J/g middot degree C 1.32 J/g middot degree C Which of these is an example of a physical property? A) Corrosiveness of sulfuric acid b) Neutralization of stomach acid with an antacid c) Lead becomes a liquid when heated to 601 degree C d) Toxicity of cyanide e) Flammability of gasoline

Explanation / Answer

30) answer is C

31) answer is C

32) answer is b (sodium and pottassium are in same group)

35) C is the answer

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