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Name __________________________ Score __________ IBChemistry 1 Sample Exam Semester 1 Part 1: Free Response (to be given Dec 14) 1.

Can someone figure out the answers to these questions....this document is a sample test. I have the answers already, but I really want to check my answers to make sure what I'm doing is right. Someone please help please?

Name __________________________ Score __________ IBChemistry 1 Sample Exam Semester 1 Part 1: Free Response (to be given Dec 14) 1. (a) Define the term isotope . .............................................................................................................................. ....... .............................................................................................................................. ....... .............................................................................................................................. ....... (2) (b) A sample of argon exists as a mixture of three isotopes. mass number 36, relative abundance 0.337% mass number 38, relative abundance 0.0630% mass number 40, relative abundance 99.6% Calculate the relative atomic mass of argon. .............................................................................................................................. ....... .............................................................................................................................. ....... .............................................................................................................................. ....... .............................................................................................................................. ....... (2) (c) State the number of electrons, protons and neutrons in the ion 56 Fe 3+ . electrons: . ............................ protons: . ............................ neutrons: . .......................... (2) (Total 6 marks) 2. The element bromine exists as the isotopes 79 Br and 81 Br, and has a relative atomic mass of 79.90. (a) Complete the following table to show the numbers of sub-atomic particles in the species shown. an atom of 79 Br an ion of 81 Br protons neutrons electrons (3) (b) State and explain which of the two isotopes 79 Br and 81 Br is more common in
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the element bromine. .............................................................................................................................. ..... .............................................................................................................................. ..... (1) (c) The element calcium is in the same period of the Periodic Table as bromine. (i) Write the electron arrangement for an atom of calcium. ................................................................................................................... ...... (1) (ii) Deduce the formula of the compound calcium bromide. ................................................................................................................... ...... (1) (Total 6 marks) 3. The following table shows values that appear in the Data Booklet. Table 1 Covalent (atomic) radii /10 –12 m N 0 F 70 66 58 Na Mg Al Si P S Cl 186 160 143 117 110 104 99 Table 2 Ionic radii/10 –12 m N 3– O 2– F 171 146 133 Na + Mg 2+ Al 3+ Si 4+ P 3– S 2– Cl 98 65 45 42 212 190 181 Explain why (i) the magnesium ion is much smaller than the magnesium atom. ………………………………………………………………………………… ………. . ………………………………………………………………………………… ………. . ………………………………………………………………………………… ………. . ………………………………………………………………………………… ………. . (2) (ii) there is a large increase in ionic radius from silicon to phosphorus. ………………………………………………………………………………… ………. . ………………………………………………………………………………… ………. .
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