1. Xia is learning about binary ionic compounds. She wants to write the formula for calcium fluoride. What is the correct formula?
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Chapter 5: Chemical Bonding + Chapter 6: Stoichiometery
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2. Which formula represents glucose?
3. Which bond is formed by transfer of electrons?
4. The reactant that limits the amount of product formed is called:
5. Ming is studying empirical and molecular formulas. He knows that the empirical formula is the simplest ratio of atoms, while the molecular formula is the actual number. For a compound with empirical formula CH and molecular mass 78, what is the molecular formula? (C=12, H=1)
6. Bilal is studying the duplet rule. He learns that it applies to certain elements. For which element does the duplet rule apply for stability?
7. Aisha is comparing the properties of ionic and covalent compounds. She knows that ionic compounds are usually soluble in water, while covalent compounds may not be. Why are ionic compounds soluble in water?
8. Carlos is learning about the structure of graphite and diamond. He knows that both are allotropes of carbon. What is the key difference in the bonding of graphite and diamond?
9. Nora is calculating the number of atoms in 2 moles of helium. How many atoms are there?
10. Which bond results in formation of ions?
11. Rachel is studying molecular and structural formulas. She knows that the molecular formula gives the actual number of atoms, but not the arrangement. Which formula shows the arrangement of atoms in a molecule?
12. Yara is studying the nature of bonding and properties. She learns that the type of bonding affects the properties of substances. Which type of bonding leads to the formation of a lattice of ions?
13. Patricia is balancing the equation: Al + O2 → Al2O3. What is the correct balanced equation?
14. Ahmed is analyzing a compound and finds that it contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. He wants to find the simplest whole-number ratio of atoms in the compound. What is this ratio called?
15. Khalid is learning about hydrogen bonding. He understands that it is a special type of dipole-dipole force. Which of the following elements is necessary for hydrogen bonding?
16. To convert mass into moles, we divide by:
17. Samir is studying the arrangement of particles in different types of bonding. He knows that in covalent bonding, atoms share electrons. What is the arrangement of particles in a molecular covalent substance?
18. Why do atoms form chemical bonds?
19. The study of chemical bonding helps in understanding:
20. Patricia is exploring ionic equations. She writes the complete ionic equation for a reaction. What is the difference between a molecular equation and an ionic equation?
21. Electron dot structure shows:
22. Which molecule contains a triple bond?
23. Avogadro’s number is:
24. Lara is calculating the number of molecules in 0.5 moles of CO2. How many molecules?
25. Khalid is calculating the mass of 2 moles of oxygen gas (O2). The molar mass of O2 is 32 g/mol. What is the mass?
26. Nora is calculating the formula mass of CaCO3. She knows Ca=40, C=12, O=16. What is the formula mass?
27. Rania is studying the structure of diamond. She learns that diamond has a rigid three-dimensional structure. What type of bonding is present in diamond?
28. Waleed is studying the structure and properties of graphite. He learns that graphite is used in pencils. Why does graphite leave a mark on paper?
29. Yusuf is calculating the formula mass of Al2O3. He knows Al=27 and O=16. What is the formula mass?
30. The property of solubility in water is common for: