Chemistry: Alkali Metals Overview

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Questions and Answers

What happens to the reactivity of alkali metals as you move down the group?

  • Reactivity remains constant
  • Reactivity increases because the outer electron is further from the nucleus (correct)
  • Reactivity decreases due to increased nuclear charge
  • Reactivity fluctuates between increasing and decreasing

Why are alkali metals stored in oil?

  • To preserve their low melting and boiling points
  • To prevent them from oxidizing when exposed to air
  • To enhance their lustrous appearance
  • To stop them from reacting with water and oxygen vapor in the air (correct)

What is produced when alkali metals react with water?

  • Hydrogen gas and a metal hydroxide (correct)
  • Oxygen gas and metal oxide
  • Carbon dioxide and a metal sulfate
  • Steam and a metal chloride

Which alkali metal is hardest to cut?

<p>Lithium (C)</p> Signup and view all the answers

Why are alkali metals categorized as 'alkali'?

<p>They form an alkali solution when dissolved in water (B)</p> Signup and view all the answers

What characteristic is NOT true for group 1 metals?

<p>High melting points (D)</p> Signup and view all the answers

What does the reactivity of alkali metals increase with?

<p>Increased atomic radius (D)</p> Signup and view all the answers

Why is the reactivity of alkali metals described as vigorous when reacting with water?

<p>They produce hydrogen gas and a hydroxide. (C)</p> Signup and view all the answers

What effect does the oxidation have on the surface of alkali metals?

<p>It dulls their shiny surface. (C)</p> Signup and view all the answers

What is a characteristic feature of the melting and boiling points of alkali metals?

<p>Low melting and boiling points (D)</p> Signup and view all the answers

Which of the following statements regarding the reactivity of alkali metals is true?

<p>Reactivity increases as you go down the group. (A)</p> Signup and view all the answers

Why do alkali metals also appear shiny when freshly cut?

<p>Fresh cutting removes the oxidized layer. (C)</p> Signup and view all the answers

What is primarily produced when alkali metals react vigorously with water?

<p>Hydrogen gas and metal hydroxide (B)</p> Signup and view all the answers

What phenomenon leads to the increased reactivity of alkali metals as one moves down the group?

<p>Increase in atomic size and weaker attraction to the nucleus (C)</p> Signup and view all the answers

Flashcards

Reactivity of alkali metals

Alkali metals, like lithium, sodium, and potassium, react more vigorously with water as you move down the group due to increasing atomic size and weaker attraction between the nucleus and outer electron.

Group 1 metal storage

Group 1 metals (lithium, sodium, potassium) are stored in oil to prevent them from reacting with oxygen and water in the air.

Alkali metal reaction product

When alkali metals (like lithium, sodium, or potassium) react with water, hydrogen gas bubbles off, and a metal hydroxide (a strong alkali) is formed.

Alkali metal properties

Group 1 metals are silvery-coloured, soft, easily cut, and shiny; their reactivity and density increase going down the group and they have low melting and boiling points.

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Alkali metal name origin

Alkali metals are named because they form an alkaline (basic) solution when reacted with water.

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Group 1 Reactivity Trend

The reactivity of alkali metals increases as you go down Group 1, because the outermost electron is farther from the nucleus and easier to lose.

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Alkali Metal Reaction with Water

Alkali metals like lithium, sodium, and potassium react vigorously with water, producing hydrogen gas and a metal hydroxide (a strong alkali).

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Why are Group 1 metals stored in oil?

Group 1 metals are stored in oil to prevent them from reacting with oxygen and water vapor in the air because they are very reactive.

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What makes Group 1 metals 'alkali'?

They form an alkaline (basic) solution when reacted with water.

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What are some properties of Group 1 metals?

Group 1 metals are silvery-coloured, soft, easily cut, shiny, have low melting and boiling points, and become less dense going down the group.

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Alkali Metals

Group 1 elements in the periodic table. They're highly reactive, soft, silvery, and form alkaline solutions when reacting with water.

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Reactivity Trend in Group 1

Reactivity increases as you go down Group 1. This is because the outer electron is farther from the nucleus, making it easier to lose.

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What is a Metal Hydroxide?

A compound formed when a metal reacts with water. It's a strong base or alkali.

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How do Group 1 Metals React with Water?

Group 1 metals react vigorously with water, releasing hydrogen gas and forming a metal hydroxide.

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Study Notes

Alkali Metals Summary

  • Alkali metals are a group of chemical elements in the periodic table.
  • Lithium (Li), Sodium (Na), and Potassium (K) are examples.
  • These metals are hard to cut, and are typically silvery-gray, becoming shiny when cut.
  • Lithium is the hardest to cut, followed by sodium, and potassium is the easiest to cut.
  • The metals are soft.
  • The surface of the metal dulls when exposed to air or oxygen.
  • Alkali metals are highly reactive elements.
  • Reactivity increases as you move down the group.
  • The elements in the alkali metal group are similar to each other.
  • They all have low melting points and boiling points.
  • They all have low densities.

Reaction with Water

  • Lithium, sodium, and potassium all react vigorously with water.
  • The reaction produces hydrogen gas and a metal hydroxide (which is an alkali).
  • Alkali metals are stored in oil to prevent them from reacting with oxygen and water vapor in the air.
  • Reactivity increases as you move down the group.
  • The added electron shells decrease the force of attraction between the nucleus and the outer electrons, easily lost.

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