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Name: ________________________ Class: ___________________ Date: __________ ID: A Physical Science Chapter 4 Test Completion Complete each sentence or statement. 1. When elements combine to form a(n) ____________________, the resulting properties may be very different from those of the elements that make it. 2. Unlike a mixture, a compound has a(n) ____________________ that is always the same. 3. The arrangement of ____________________ or ____________________ within a substance is its chemical structure. 4. The chemical formula H2O means a water molecule contains one ____________________ for every two ____________________. 5. Formula units of salt, NaCl, contain equal numbers of ____________________ and ____________________. 6. The distance between the nuclei of two bonded atoms is referred to as ____________________. 7. The structural formula for a water molecule is ____________________. 8. The melting and boiling points of quartz are very high because of the compound's ____________________. 9. Networks can be made of bonded ____________________ or ____________________. 10. Atoms bond in compounds when their ____________________ interact. 11. In ionic compounds, the positively charged ions are formed from ____________________ elements. 12. When atoms form bonds and fill their outermost energy levels, they have an electronic arrangement similar to that of a(n) ____________________. 13. The structure of silicon dioxide consists of a ____________________ of atoms. 14. When two chlorine atoms bond, they ____________________ a pair of electrons. 15. A(n) ____________________ bond is formed by the attraction between positively charged metal ions and the ____________________ around them. 16. A(n) ____________________ bond is formed when atoms share ____________________ of electrons. 17. Most covalent compounds have relatively ____________________ melting points. 18. Because polyatomic ions are made of covalently bonded atoms that have either gained or lost electrons, they behave like simple ____________________. 19. A compound whose molecules contain one boron atom and three fluorine atoms would be named ____________________. 20. A compound consisting of Br– and Cd2+ ions would be named ____________________. 21. A compound consisting of Cr3+ ions and OH– ions would be named ____________________. 22. The charge of each titanium ion in the ionic compound TiO2 is ____________________. 23. The charge of each iron ion in the ionic compound FeS is ____________________. 1 Name: ________________________ ID: A 24. The chemical formula for the ionic compound consisting of oxide ions and nickel(III) ions is ____________________. 25. The chemical formula for the ionic compound consisting of nitride ions and titanium(III) ions is ____________________. 26. The simplest formula for a covalent compound is its ____________________ formula. 27. A compound's ____________________ formula tells you how many atoms of each type are in one molecule. 28. Each carbon atom can form a total of ____________________ bonds. 29. In addition to carbon, organic compounds almost always contain ____________________. 30. When a compound is made of only carbon and hydrogen atoms it is called a(n) ____________________. 31. Simple organic compounds that contain a hydroxyl group, –OH, are called ____________________. 32. ____________________ are compounds that have repeating subunits. 33. Organic compounds with carbon-carbon double bonds are referred to as ____________________. 34. Both starches and sugars are made of the elements ____________________, ____________________, and ____________________. 35. A(n) ____________________ is a polymer made of bonded amino acids. 36. DNA can ____________________ itself because it is made of two strands that can be separated. 2 ID: A Physical Science Chapter 4 Test Answer Section COMPLETION 1. 2. 3. 4. 5. 6. compound chemical formula atoms; ions oxygen atom; hydrogen atoms sodium ions; chloride ions bond length 7. 8. network structure structure 9. atoms; ions 10. valence electrons 11. metal 12. noble gas 13. network 14. share 15. metallic; electrons 16. covalent; pairs 17. low 18. ions 19. boron trifluoride 20. cadmium(II) bromide 21. chromium(III) hydroxide 22. Ti4+ 23. Fe2+ 24. Ni2O3 25. TiN 26. empirical 27. molecular 28. four 29. hydrogen 30. hydrocarbon 31. alcohols 32. Polymers 33. alkenes 34. carbon, hydrogen, oxygen 1 ID: A 35. protein 36. copy replicate 2