Physical Science - Ionic Bonds

K (potassium) belongs to group IA of the periodic table, and has 1 valence electron. Br (bromine) belongs to VIIA, and has ______ 7 valence electrons

7 (Seven)

Peter performed an experiment to test which of the three compounds his teacher gave him was an ionic compound. The table shows his results. Which compound (A, B, or C) is most likely an ionic compound?

B

Which is an example of a polyatomic ion?

CO3

Which of these ionic compounds have polyatomic ions? Check all that apply.

CaCO3 and NaOH

Which products rely on the ability of ionic compounds to conduct electricity? Check all that apply.

Cell phones, remote control toys

Which shows the correct order of steps during the formation of an ionic bond?

Electrons are transferred → Ions form → Ions are attracted to each other

Put the steps in order to show how crystals are formed.

Formation of ions: 1 Formation of crystals: 4 Formation of ionic bonds: 2 Formation of cubes: 3

Which of these pairs would form an ionic bond?

K and Br

Suppose you want to test if a sample compound is ionic. You have these materials: the solid compound, a glass container, a spoon, and a conductivity apparatus. What material is missing from your list, and why is it necessary?

One material I may need to use is water because it can be dissolved in water. Ionic compounds will break into ions and allow the solution to conduct an electric current, whereas covatently bonded substances will not.

Explain the process of ionic bond formation between K (potassium, a metal) and Br (bromine, a nonmetal).

Potassium loses its valence electrons to bromine. This means that K and Br are now stable with 8 electrons. K becomes a positive ion and Br becomes a negative ion. The positive K ion and the negative Br Ion attract each other to form an ionic bond

Sulfur is an element that can be seen on the periodic table. What will most likely occur if sulfur forms an ionic bond with another element?

Sulfur will accept electrons

David observed properties of four different compounds, only one of which is an ionic compound. His observations are shown in the chart. Which is most likely the ionic compound?

Z

Mason compared the properties of two compounds. Magnesium oxide is an ionic compound, and hydrogen peroxide is not an ionic compound. Therefore, both compounds most likely

can dissolve in water

Polyatomic ions bond with other ions to form ionic ____

compounds

Chalk is an ionic compound. Which is a property of all ionic compounds that makes chalk particularly useful for writing on a chalkboard?

hardness and brittleness

Which ionic compound is used as a building material?

limestone

The periodic table shows metals, nonmetals, and noble gases. Which two elements will most likely form an ionic bond?

magnesium and silicon