Ions and Formula Units Worksheet
Explore the fundamental concepts of ions, polyatomic ions, and the formation of ionic compounds and formula units in this Grade 11 Chemistry worksheet.
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Ions and Formula Units
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Read each question carefully and provide your best answer. Show all work for calculations.
1. Which of the following best describes an ion?
An atom that has gained neutrons.
An atom that has lost or gained electrons.
An atom that has lost or gained protons.
A neutral atom with an equal number of protons and electrons.
2. What is the charge of a sulfate ion?
+1
-1
+2
-2
3. A positively charged ion is called a , while a negatively charged ion is called an .
4. Ionic compounds are formed between a and a .
5. The smallest whole-number ratio of ions in an ionic compound is referred to as a .
6. Explain the difference between a monatomic ion and a polyatomic ion. Provide an example of each.
7. Write the chemical formula for the ionic compound formed between Calcium (Ca) and Phosphate (PO₄³⁻). Explain your reasoning.
8. All ionic compounds are soluble in water.
True
False
9. A formula unit represents a single molecule of an ionic compound.
True
False
Match the ion with its correct charge.
10. Sodium ion
a. -2
11. Chloride ion
b. +2
12. Oxide ion
c. -1
13. Magnesium ion
d. +1
14. Discuss the octet rule and how it relates to the formation of ions and the stability of ionic compounds. Provide examples of elements that typically form cations and anions based on this rule.
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