Question

1. complete the electron dot structures below to show how beryllium fluoride (bef₂) is formed. use the diagram on page 203 as a model.

be + f f → be f f

1. most ionic compounds are solid at room temperature.
2. is the following sentence true or false? ionic compounds generally have low melting points. false
3. circle the letter of each statement that is true about ionic compounds.

a. when dissolved in water, ionic compounds can conduct electricity.
b. when melted, ionic compounds do not conduct electricity.
c. ionic compounds have very unstable structures.
d. ionic compounds are electrically neutral.

Explanation:

Step1: Analyze ionic compound properties

Ionic compounds have strong electrostatic - forces between ions.

Step2: Evaluate conductivity

When dissolved in water, ions are free to move and conduct electricity. So a is true.

Step3: Consider melting state conductivity

When melted, ions are mobile and can conduct electricity, so b is false.

Step4: Assess stability

Ionic compounds have stable structures due to strong ionic bonds, so c is false.

Step5: Check electrical neutrality

Ionic compounds are electrically neutral as the sum of positive and negative charges is zero, so d is true.

Answer:

a. When dissolved in water, ionic compounds can conduct electricity.
d. Ionic compounds are electrically neutral.