Question

all compounds containing group 1a alkali metals are soluble in water.
true
false
2 multiple choice 1 point
which of the following ions forms compounds that are always soluble in water?
sulfides
carbonates
nitrates
sulfates
3 true or false 1 point
spectator ions are shown in net ionic equations.
true
false

Explanation:

Question 1 (True/False)

Group 1A alkali metal compounds (like Li⁺, Na⁺, K⁺ salts) are generally soluble in water due to their ionic nature and hydration energy. No common insoluble group 1A compounds exist, so the statement is true.

• Sulfides: Many sulfides (e.g., PbS, CuS) are insoluble.
• Carbonates: Most carbonates (e.g., CaCO₃, BaCO₃) are insoluble.
• Nitrates: All nitrate compounds (e.g., NaNO₃, KNO₃) are soluble in water (solubility rule: nitrates are always soluble).
• Sulfates: Some sulfates (e.g., BaSO₄, PbSO₄) are insoluble.

So nitrates form always - soluble compounds.

Spectator ions are ions that do not participate in the chemical reaction (they appear the same on both sides of the full ionic equation). Net ionic equations exclude spectator ions, showing only the ions involved in the reaction. So the statement is false.

Answer:

True

Question 2 (Multiple Choice)