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Q1. Chemistry is both a molecular science and a materials science that has direct relevance in our daily lives. Q2. What are the differences between compounds and ions? Q3. A three color liquid, used as a solvent were placed in a tube liquid Density (in g/mL) was 1- 2- 3- n-butyl alcohol 0.810 ethylene glycol 1.114 isopropyl alcohol 0.785 ldentify which of the liquid is at the top, the middle, and the bottom?
04 Substance Density (in g/mL) n-butyl alcohol 0.810 ethylene glycol 1.114 isopropyl alcohol 0.785 toluene 0.866 To identify the substance, a chemist determined its density. By pouring a sample of the liquid into a graduated cylinder, she found that the volume was 35.1 ml She also found that the sample weighed 30.5 g. What was the density of the liquid? What was the substance? Q5. This is a copper penny floats on mercury, give an explanation?
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Q9. A 75.0-g sample of a pure liquid, liquid A, with a density of 3.00 g/mL is mixed with a s0.0-mL sample of a pure liquid, liquid B, with a density of 2.00 g/mti What is the total volume of the mixture? (Assume there is no reaction upon the mixing of A and B.) a. 275 mL b. 175 ml c. 125 mL d. 100. mL e. 75 mL Q10. Which of the following are physical changes and which are chemical changes? a. melting of sodium chloride b. pulverizing of rock salt c. burning of sulfur d. dissolving of salt in water
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2. 2 compoumds are neutrat speies or iomi bonds ay caoydimate vovalent bonds between fomed y covatent but ivns are charged speeies tome bay eleutron donating or aucepting frum other atous oy moleules 82 Ans Golden Isopropyl al cohol Th e aloove sequence is because, Etughene o as more densithy than the otner turo iquid densihy will be at tue bottom and which hawe les dansits will be at tne top. Thats why and n-buty alcohol has imtermedicte densi that whtsauys at middde R.4 Ans mass e know, density volume 35 m 30-5 r- o . 8689 g/m) 25 m) with the den, t Densi lue ot duns İty match e of Tolene tence, the compomd s To tuene

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