Αποτελέσματα Αναζήτησης
Recognize ionic compound, molecular compounds, and acids. Give the names and formulas for ionic compounds; Give the names and formulas for molecular compound s; Give the name and formula for acidic compound
When an ionic compound is formed from magnesium and oxygen, the magnesium ion has a 2+ charge, and the oxygen atom has a 2− charge. Although both of these ions have higher charges than the ions in lithium bromide, they still balance each other in a one-to-one ratio.
Thus the formula is CaCl 2. Similarly, calcium phosphate must be Ca 3 (PO 4) 2 because the cation and the anion have charges of +2 and −3, respectively. The best way to learn how to name ionic compounds is to work through a few examples, referring to Figure 2.10, Table 2.2, Table 2.4, and Table 2.5 as needed.
Magnesium and nitrogen react to form an ionic compound. Predict which forms an anion, which forms a cation, and the charges of each ion. Write the symbol for each ion and name them.
Only one ion of each is needed to balance these charges. The formula for lithium bromide is LiBr. When an ionic compound is formed from magnesium and oxygen, the magnesium ion has a 2+ charge, and the oxygen atom has a 2− charge.
Roman numeral notation indicates charge of ion when element commonly forms more than one ion. For example, iron( II ) has a 2+ charge; iron( III ) a 3+ charge.
The charge of the metal ion is determined from the formula of the compound and the charge of the anion. For example, consider binary ionic compounds of iron and chlorine. Iron typically exhibits a charge of either 2+ or 3+ (see Figure 2.29), and the two corresponding compound formulas are FeCl 2 and FeCl 3.
