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15. Write the chemical formulas or names of the following ionic compounds. (8pts) \( \begin{array}{ll}\text { a. barium fluoride } & \text { c. } \mathrm{Cu}_{2} \mathrm{O} \\ \text { b. mercury(II) phosphate } & \text { d. } \mathrm{Na}_{2} \mathrm{SO}_{4}\end{array} \) 16. Write the chemical formulas or names of the following molecular compounds. (8pts) \( \begin{array}{ll}\text { a. dichlorine heptoxide } & \text { c. } \mathrm{SF}_{6} \\ \text { b.chlorine dioxide } & \text { d. } \mathrm{N}_{2} \mathrm{O}\end{array} \)

Ten grams ( 10 g ) of an impure sample of sodium carbonate is added to \( 100 \mathrm{~cm}^{3} \) of a 0,2 mol \( \mathrm{dm}^{3} \) solution of hydrochloric acid. The acid is in excess. The equation for the reaction is: \( \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{HCl} \rightarrow \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \) \( 8.3 .1 \quad \) Balance the equation above. \( 8.3 .2 \quad \) Calculate the number of moles of hydrochloric acid. The excess acid neutralises \( 20 \mathrm{~cm}^{3} \) of a solution of 0,1 mol.dm of magnesium hydroxide. \( 2 \mathrm{HCl}(\mathrm{aq})+\mathrm{Mg}(\mathrm{OH})_{2}(\mathrm{aq}) \rightarrow \mathrm{MgCl}_{2} \) (aq) \( +\mathrm{H}_{2} \mathrm{O}(t) \)

Calcula la y en mol NaOH .61

8.2 Consider the following acid-base reaction: \[ \mathrm{H}_{2} \mathrm{PO}_{4}+\mathrm{NH}_{3} \rightarrow \mathrm{HPO}_{4}^{2}+\mathrm{NH}_{4}^{+} \] 8.2.1 Identify the conjugate acid-base pairs in the above reaction. 8.2.2 Define the term ampholyte. 8.2.3 Choose an ampholyte in the above reaction.

The atomic number of silver is 47 . How many neutrons are in a silver-108 atom? 155 47 61 108

he course Mg(NO total ionic equation: net ionic equation: spectator ions: \( \longrightarrow \)

An ionic bond is a chemical bond that holds

An ionic bond is a chemical bond that holds:

This French scientist, \( \square \) is the Father of Modern Chemistry.

Match the following terms with their definitions: elements that are good conductors and malleable elements that are poor conductors and tend to be brittle elements that are moderate conductors