Practice Questions
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Which of the following statements is true regarding rubidium (Rb), an alkali metal?
Rubidium reacts violently with water. Other options are incorrect because Some think heavier metals are less reactive, but reactivity actually rises d...
Which chemical property of potassium (K) distinguishes it from other alkali metals?
When potassium vapor is heated, it emits a light purple color in a flame test. Other options are incorrect because Density is not a distinguishing fea...
Which of the following statements correctly describes the properties of potassium (K), an alkali metal in Group 1 of the periodic table?
Potassium is a soft, silver‑grey metal that reacts very fast when it touches water. Other options are incorrect because Many people think metals can b...
Which statement correctly describes the electron configuration of cesium (Cs) and highlights its industrial uses, particularly in relation to its reactivity as an alkali metal?
Cesium’s electron layout is [Xe] 6s1, meaning it has one electron in the outermost shell. Other options are incorrect because The idea that cesium’s c...
Which of the following statements is true regarding lithium (Li) in relation to its electron configuration and flame test color?
Lithium’s atoms have two electrons in the 1s orbital and one in the 2s orbital. Other options are incorrect because The belief that lithium produces g...
Alkali metals are known for their high reactivity, particularly with ______, resulting in the formation of hydroxides and the release of hydrogen gas.
Alkali metals give up one electron very easily. Other options are incorrect because Many people think alkali metals mainly burn in air, but that is a ...
When alkali metals react with water, they produce hydrogen gas and a hydroxide. What is the primary reason for the high reactivity of alkali metals with water?
Alkali metals have one electron in their outermost shell. Other options are incorrect because People sometimes think heavier metals react faster just ...
Which property of alkali metals primarily explains their vigorous reaction with water?
Alkali metals have very low ionization energy, which means it is easy to remove their outermost electron. Other options are incorrect because Many thi...
Sodium:Water :: Lithium:?
When lithium touches water, it fizzes and releases a gas. Other options are incorrect because Some people think lithium reacts with air because many m...
Order the following reactions of alkali metals with water, halogens, and hydrogen from the least reactive to the most reactive: A) Reaction with halogens B) Reaction with hydrogen C) Reaction with water D) Reaction with oxygen
Reaction with hydrogen produces solid metal hydrides and is the slowest reaction. Other options are incorrect because Some think oxygen is the most re...
If sodium is placed in water, it reacts vigorously, producing hydrogen gas and hydroxide. What property of alkali metals explains this reactivity?
Alkali metals have a low ionization energy, meaning their outermost electron is easy to remove. Other options are incorrect because The misconception ...
Which of the following metals is classified as an alkali metal, and why does it exhibit the highest reactivity with water compared to others in this group?
Sodium has one electron in its outer shell, and it is very easy to lose this electron. Other options are incorrect because A common idea is that heavi...
During a science demonstration, a teacher decides to show students the reaction of sodium (an alkali metal) with water. What do you expect to happen during this reaction, and why is it significant in understanding the properties of alkali metals?
Sodium floats because it is lighter than water. Other options are incorrect because The idea that sodium just dissolves ignores its reactivity; Sodium...
Which of the following statements accurately describe the properties and behaviors of alkali metals? Select all that apply.
Alkali metals have one electron in the outer shell. Other options are incorrect because Some people think alkali metals are inert, but they are actual...
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