Unit 1 Chemistry
Quiz by Jimmy Lin
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15 questions
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- Q1An atom A has one electron in its outer shell and an atom B has six electrons in its outer shell. When they react, the most likely formula for the compound isAB2ABA2BAB630s
- Q2In the molten state, an ionic compound conducts electricity becausethe electrons are free to movethe molecules are free to movethe ions are free to movethe atoms are free to move30s
- Q3In dry ice (solid carbon dioxide) the carbon dioxide molecules are held together bycovalent bondsdispersion forcesdipole-dipole forceshydrogen bonds30s
- Q4Polyethene can be produced in branched or unbranched form. Compared to the branched form, the unbranched form showslower density and higher melting temperaturehigher density and higher melting temperaturelower density and lower melting temperaturehigher density and lower melting temperature30s
- Q5The number of lone pairs of electrons in the nitrogen molecule is426830s
- Q6Ionic compounds are often brittle, so that the crystal shatters when hit. This is becauseforces between the ions are wekathe positive and negative ions neutralise each otherlayers of ions move and repulsion between ions of the same charge occursthe delocalised electrons are unable to hold the positive ions30s
- Q7Allotropes arecompounds with the same molecular formula but a different structural formuladifferent physical forms of the same elementatoms of the same elements with different numbers of neutronselements in the same group in the periodic table30s
- Q8A doubly negatively charged ion has either protons. The number of electrons in the ion is1062830s
- Q9Which one of the following has a different electron configuration from the others?Na+F-K+Ne30s
- Q10Which one of the following pairs of elements is most likely to combine to from a compound with properties similar to those of sodium chloride?phosphorus and chlorinecarbon and oxygencalcium and brominecopper and nickel30s
- Q11Isotopes of an element contain:the same atomic number and a different mass numbera different atomic number an a different mass numberthe same atomic number and the same mass numbera different atomic number and the same mass number30s
- Q12The relative atomic mass of magnesium is 24.31. The most important reason why it is not a whole number is thatthe mass of the magnesium atom is compared to the mass of the 12-C isotopethe relative atomic mass given is only an approximationmagnesium atoms lose electrons when they reactnot all atoms of magnesium have the same number of neutrons30s
- Q13The boiling temperature of alkanes increases as the number of carbon atoms increases becausethe forces within the molecules get strongerthe hydrogen bonding increases with the extra hydrogen atoms presentthe number of structural isomers increases with the extra atoms presentthe dispersion forces get stronger with the extra atoms present30s
- Q14Which one of the following groups of substances shows only covalent compounds?HCl, H2O, H2S, H2SO4CO2, N2, O2, KNO3NH3, H2O, Na2S, CO2NaCl, CH4, CO2, N2O30s
- Q15Metals are malleable and ductile because when a metal is hitsome of the atoms move but are held in a new position by the covalent bondssome of the delocalised electrons move the positive ions stay in positionsome of the ions move but are held in a new position by the delocalised electronssome of the protons move but are held in a new position by the neutrons30s