Metals and Non-metals: Conductivity and Properties

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Questions and Answers

Which property primarily distinguishes metals from non-metals in the context of electrical applications?

  • Luster
  • Conductivity (correct)
  • Ductility
  • Malleability

Which of the following non-metals is an exception to the general rule that non-metals do not conduct electricity?

  • Nitrogen
  • Graphite (correct)
  • Sulfur
  • Oxygen

Which of the following metals is most commonly used in electrical wiring due to its high conductivity and relatively low cost?

  • Silver
  • Copper (correct)
  • Gold
  • Aluminum

What two gases constitute approximately 99% of atmospheric air?

<p>Nitrogen and Oxygen (A)</p> Signup and view all the answers

Which of the following is a characteristic property of metals related to their appearance?

<p>Metallic Luster (A)</p> Signup and view all the answers

What term describes the ability of metals to be hammered into thin sheets?

<p>Malleability (A)</p> Signup and view all the answers

Which of the following describes the role of a metal in a chemical reaction when it donates electrons?

<p>Reducing Agent (A)</p> Signup and view all the answers

What type of ion is formed when a metal atom loses electrons?

<p>Cation (D)</p> Signup and view all the answers

Which of the following best describes the typical melting and boiling points of metals compared to non-metals?

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

What term is used to describe the property of metals that allows them to be drawn into wires?

<p>Ductility (B)</p> Signup and view all the answers

Which of the following elements is an example of a metal that can be easily cut with a knife?

<p>Sodium (A)</p> Signup and view all the answers

Which of the following gases acts as an oxidizing agent by readily accepting electrons?

<p>Oxygen (B)</p> Signup and view all the answers

Which of the following non-metals has a relatively high melting point compared to other non-metals, but still lower than most metals?

<p>Iodine (D)</p> Signup and view all the answers

Which metal is known for its very high melting point and is commonly used in high-temperature applications?

<p>Tungsten (B)</p> Signup and view all the answers

What type of solid is graphite, which contributes to its high melting point and unique properties?

<p>Network Covalent Solid (C)</p> Signup and view all the answers

Which of the following metals is a liquid at room temperature?

<p>Mercury (B)</p> Signup and view all the answers

If aluminum (Al) loses three electrons, what ion does it form?

<p>Al+3 (D)</p> Signup and view all the answers

Which of the following non-metals typically acts as an oxidizing agent?

<p>Chlorine (D)</p> Signup and view all the answers

How does the melting point of molecular solids typically compare to that of network covalent solids?

<p>Molecular solids have lower melting points. (B)</p> Signup and view all the answers

Diamond is an excellent conductor of heat but not electricity. How does this property contrast with most other non-metals?

<p>Most non-metals do not conduct heat or electricity. (C)</p> Signup and view all the answers

Given that iron (Fe) typically forms Fe2+ ions, how many electrons does an iron atom lose when it acts as a reducing agent?

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

Which of the following best illustrates how the properties of malleability and ductility are utilized in the manufacturing of common household items?

<p>Aluminum is used to create packaging foil due to its malleability. (B)</p> Signup and view all the answers

Consider two elements: Element A has a melting point of 1500°C and is known to form cations easily, while Element B has a melting point of -100°C and forms anions. What can be inferred about their classification?

<p>A is likely a metal, and B is likely a non-metal. (C)</p> Signup and view all the answers

If a substance is described as being a good reducing agent, what is its primary characteristic regarding electron transfer?

<p>It readily donates electrons to other substances. (B)</p> Signup and view all the answers

Gallium (Ga) has a notably low melting point but a very high boiling point. How does this behavior differ from typical metals and non-metals, and what does it suggest about its intermolecular forces in liquid form?

<p>Atypical metal; strong intermolecular forces. (B)</p> Signup and view all the answers

Consider a scenario where a new element, 'X', is discovered. It is shiny, malleable, conducts electricity, and reacts with chlorine to form XCl2. Is element 'X' more likely a metal or a nonmetal, and what charge would its ion likely carry?

<p>Metal, +2 (A)</p> Signup and view all the answers

While both graphite and diamond are allotropes of carbon, they exhibit vastly different electrical conductivities. What structural difference primarily accounts for graphite's ability to conduct electricity while diamond cannot?

<p>Graphite has a layered structure with delocalized electrons, while diamond has a tetrahedral structure with localized electrons. (B)</p> Signup and view all the answers

Imagine two newly synthesized materials: Material A, composed of element 'M', is an excellent reducing agent with a high melting point; Material B, of element 'N', is a potent oxidizing agent with a low melting point. If compounds MN, MN2 and M2N can form, which compound is least likely to exist, considering typical oxidation states?

<p>MN2 (A)</p> Signup and view all the answers

A researcher discovers a new element 'Q' that has a melting point similar to Calcium, conducts electricity similarly to Graphite and can be hammered into sheets like Aluminum. Which classification is most likely for element 'Q'?

<p>A metalloid with properties that defy standard classification. (B)</p> Signup and view all the answers

You are tasked with selecting a material for a high-voltage power line that must function in extreme cold. Which combination of properties is most crucial for ensuring both safety and efficiency?

<p>High electrical conductivity and high tensile strength. (B)</p> Signup and view all the answers

In the context of ionic compound formation, how does the electronegativity difference between a metal and a non-metal influence the likelihood of forming a stable compound?

<p>A large electronegativity difference promotes ionic bonding by facilitating electron transfer. (B)</p> Signup and view all the answers

The boiling point of sulfur is significantly lower than that of calcium. Assuming equal molar masses, what explains this disparity?

<p>Sulfur is a molecular solid with weak intermolecular forces. (B)</p> Signup and view all the answers

When chlorine gas (Cl2) gains two electrons, what ion is formed and what is its role in a chemical reaction?

<p>Cl-, reduction (A)</p> Signup and view all the answers

Which statement accurately compares electrical conductivity in metals and nonmetals based on electron behavior?

<p>Metals have delocalized electrons, enabling conductivity, while nonmetals have localized electrons, inhibiting it. (A)</p> Signup and view all the answers

To optimize a long-distance power transmission line for efficiency and durability across varying temperatures, which combination of metal properties would be most suitable?

<p>High electrical conductivity, low thermal expansion, high tensile strength. (D)</p> Signup and view all the answers

An unknown substance is found to be brittle and is found to form an anion in ionic compounds. Which of the following can be concluded about it?

<p>It is likely a non-metal. (B)</p> Signup and view all the answers

Compare sulfur to calcium with respect to their characteristics as oxidizing or reducing agents. Which is most accurate?

<p>Sulfur is an oxidizing agent, while calcium is a reducing agent. (C)</p> Signup and view all the answers

Which region of the periodic table primarily houses elements that readily form positive ions?

<p>Bottom left (B)</p> Signup and view all the answers

What is a characteristic behavior of non-metals when forming ions?

<p>They form negative ions. (B)</p> Signup and view all the answers

Why do elements like chlorine not form positive ions?

<p>They require too much energy to lose electrons. (B)</p> Signup and view all the answers

What is the relationship between the number of electron shells and the reactivity of a metal?

<p>Reactivity increases with more electron shells. (D)</p> Signup and view all the answers

How does weaker nuclear attraction affect the ability of a metal to form positive ions?

<p>It makes it easier to lose electrons. (C)</p> Signup and view all the answers

What type of bonding is responsible for many of the characteristic physical properties of metals?

<p>Metallic bonding (A)</p> Signup and view all the answers

Which property of metals allows them to be shaped without breaking?

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

Why are metals used in electrical wires?

<p>They are excellent heat and electricity conductors. (D)</p> Signup and view all the answers

What is a typical melting and boiling point range for metals compared to non-metals?

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

Which term describes the sound that metals produce when struck?

<p>Sonorous (B)</p> Signup and view all the answers

What is a typical appearance of non-metals?

<p>Dull (D)</p> Signup and view all the answers

Which of the following is generally true of the boiling points of non-metals?

<p>Many are gases at room temperature. (A)</p> Signup and view all the answers

Density is a physical property. How do the densities of non-metals compare to those of metals?

<p>Non-metals are less dense. (B)</p> Signup and view all the answers

What is a characteristic property of non-metals pertaining to their reaction to stress?

<p>Brittle (D)</p> Signup and view all the answers

Where are transition metals located on the periodic table?

<p>Central block (D)</p> Signup and view all the answers

What is a distinctive property of transition metals regarding ion formation?

<p>They can form multiple ions. (C)</p> Signup and view all the answers

What visual characteristic is commonly associated with solutions containing transition metal ions?

<p>Colored (A)</p> Signup and view all the answers

How do transition metals affect chemical reactions?

<p>They accelerate reactions as catalysts. (D)</p> Signup and view all the answers

Which process does iron catalyze in the industrial production of ammonia?

<p>Haber process (A)</p> Signup and view all the answers

In the production of margarine, which metal is used to catalyze the hydrogenation of alkenes?

<p>Nickel (D)</p> Signup and view all the answers

Why do elements lower on the periodic table exhibit greater metallic reactivity?

<p>Their outer electrons are less tightly held. (B)</p> Signup and view all the answers

What accounts for the high melting points observed in most metals?

<p>Strong metallic bonds (A)</p> Signup and view all the answers

Compared to metals, what is a distinctive characteristic of non-metals regarding electrical conductivity?

<p>Poor conductors (A)</p> Signup and view all the answers

Which property of metals allows them to be drawn into wires?

<p>Ductility (D)</p> Signup and view all the answers

How does the electronic configuration of elements in Group 2 influence their reactivity?

<p>They easily lose two electrons. (B)</p> Signup and view all the answers

Which of the following properties makes metals suitable for use in construction?

<p>Malleability and high tensile strength (C)</p> Signup and view all the answers

Considering elements found lower on the periodic table, what happens to the attraction between the nucleus and outer electrons?

<p>The attraction decreases. (D)</p> Signup and view all the answers

Which characteristic is most affected by the presence of delocalized electrons in metallic bonding?

<p>Electrical conductivity (A)</p> Signup and view all the answers

How does the ability of transition metals to form multiple ions influence their role in biological systems?

<p>It allows them to participate in complex redox reactions. (C)</p> Signup and view all the answers

What is the impact of metallic bonding on the physical state of metals at room temperature?

<p>Metals are typically solids due to strong bonds. (B)</p> Signup and view all the answers

Why are non-metals generally poor conductors of heat and electricity?

<p>They lack delocalized electrons. (B)</p> Signup and view all the answers

In what way does the number of electron shells affect the reducing ability of a metal?

<p>More shells increase reducing ability. (D)</p> Signup and view all the answers

How does the electron configuration of transition metals enable them to act as catalysts?

<p>They have variable oxidation states. (D)</p> Signup and view all the answers

Consider two unknown elements 'X' and 'Y'. 'X' readily forms $X^{2+}$ ions and conducts electricity, while 'Y' exists as a diatomic gas at room temperature and is an insulator. If they form a compound, what is the most likely formula and bond type?

<p>XY₂, ionic (B)</p> Signup and view all the answers

Suppose element 'G' is a newly discovered metal located far down the periodic table. It is observed to react violently with water, producing hydrogen gas and heat. Compared to sodium (Na), which is higher up in Group 1, how would you expect 'G' to behave regarding electron loss and why?

<p>'G' will lose electrons more easily than Na because its outer electrons are more shielded from the nucleus. (C)</p> Signup and view all the answers

Imagine an industrial process requires a catalyst that must withstand extreme temperatures. Given your knowledge of transition metals, which catalytic strategy would be LEAST effective?

<p>Utilizing a transition metal salt with high vapor pressure at lower temperatures to ensure efficient dispersion from the catalyst bed at elevated operation temperatures. (D)</p> Signup and view all the answers

A research team synthesizes a novel element, tentatively named 'Adamantium' (Ad). Initial studies suggest it is extremely hard, has an exceptionally high melting point, and forms a compound with chlorine with the formula AdCl4. Assuming Adamantium behaves predictably based on its properties, what is MOST likely true about its electron behavior?

<p>Adamantium loses four electrons to form a +4 cation. (D)</p> Signup and view all the answers

If a new element “Elara” (Er) is discovered and found to readily form Er³⁺ ions, conducts electricity but is also observed to shatter into fragments under strong impact, what combination of properties could explain its behavior?

<p>The electron sea is somewhat localized, resulting in conductivity but also directional weaknesses. (B)</p> Signup and view all the answers

Flashcards

Conductors

Substances that allow heat and electricity to flow through them easily.

Insulators

Materials that do not conduct heat and electricity well.

Graphite

A non-metal exception that conducts electricity.

Metals

Elements that are good conductors of heat and electricity, are shiny, hard, malleable, and ductile.

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Non-metals

Elements that are generally poor conductors of heat and electricity, dull, and brittle.

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Malleability

The ability of a metal to be hammered into flat sheets.

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Ductility

The ability of a metal to be drawn into wires.

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Reducing agent

A substance that donates electrons in a chemical reaction.

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Oxidizing agent

A substance that accepts electrons in a chemical reaction.

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Cations

Positively charged ions formed by metals when they lose electrons.

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Anions

Negatively charged ions formed by non-metals when they gain electrons.

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Melting Point

The temperature at which a substance changes from solid to liquid.

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Boiling Point

The temperature at which a substance changes from liquid to gas.

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Network Covalent Solids

Solids where atoms are linked by covalent bonds into a continuous network.

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Metallic luster

Shiny appearance characteristic of metals.

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Metal Ion Formation

Metals typically form positive ions when reacting due to their tendency to lose electrons.

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Non-metal Ion Formation

Non-metals may not form ions or can form negative ions when reacting; they tend to gain electrons.

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Metal Reactivity Trend

Metals become more reactive as you move down the periodic table.

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Metallic Bonding

A strong type of bonding unique to metals, responsible for their malleability and conductivity.

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Malleability in Metals

The ability to be shaped without breaking, a characteristic of metals.

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Metal Conductivity

Metals conduct heat and electricity very well due to their metallic bonding.

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Typical Non-metal Properties

Tend to have a dull appearance, are brittle, and are poor conductors of electricity.

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Transition Metals

Located in the center of the periodic table, they exhibit typical metallic properties and can form multiple ions.

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Variable Ion Formation

Capable of forming multiple ions with various positive charges.

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Colored Ions

Frequently colored when in aqueous form.

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Catalytic Property

Speed up chemical reactions without being consumed in the process.

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Study Notes

Properties of Metals and Non-metals: Conductivity

  • Metals are conductors of heat and electricity.
  • Non-metals are generally insulators, meaning they do not conduct heat and electricity.
  • Graphite, a form of carbon, is an exception among non-metals as it can conduct electricity.
  • Diamond, another form of carbon, is an excellent conductor of heat but not electricity.
  • Copper and silver are commonly used as wires in electrical devices due to being very good conductors of electricity.
  • Gold is also a good conductor of electricity but is expensive.

Examples of Metals and Non-metals

  • Common examples of metals include aluminum, iron, copper, silver, and gold.
  • Examples of non-metals include oxygen gas, nitrogen gas, chlorine, helium gas and sulfur.
  • Atmospheric air is composed of approximately 79% nitrogen and 20% oxygen.

Appearance and Hardness

  • Metals tend to be shiny and have a metallic luster.
  • Non-metals are usually dull and lack a metallic luster.
  • Most metals are hard and do not break easily.
  • Non-metals are usually brittle in their solid form.
  • Alkali metals like sodium and potassium are exceptions, as they are soft and can be cut with a knife.

Malleability and Ductility

  • Metals are malleable, meaning they can be hammered into flat sheets.
  • Metals are ductile, meaning they can be pulled or drawn into wires.

Reducing and Oxidizing Agents

  • Most metals are reducing agents, meaning they like to give away electrons.
  • Non-metals tend to be oxidizing agents, meaning they like to take electrons.
  • Aluminum (Al) is a reducing agent that gives away three valence electrons to form a Al3+ ion.
  • Iron (Fe) is a reducing agent that gives away two electrons to form the Fe2+ ion.
  • Metals form positively charged ions called cations when they give away electrons.
  • Chlorine gas (Cl2) is an oxidizing agent that takes two electrons to form an ion with a negative charge.
  • Oxygen (O2) is an oxidizing agent that forms ions with a -2 charge when it takes electrons.
  • Non-metals form negatively charged ions called anions when they take electrons.

Melting and Boiling Points

  • Metals tend to have relatively high melting points and boiling points.
  • Non-metals tend to have low melting and boiling points compared to metals.
  • Calcium (Ca) has a melting point of 842°C and a boiling point of 1484°C.
  • Oxygen (O2) has a melting point of -219°C and a boiling point of -183°C.
  • Sodium (Na) has a relatively low melting point of 98°C but a high boiling point of 883°C.
  • Sulfur (S) has a melting point of 115°C and a boiling point of 445°C, which is low relative to calcium.
  • Tungsten has an extremely high melting point of 3422°C and a boiling point of 5930°C.
  • Iodine is a non-metal that is solid at room temperature with a melting point of 114°C and boiling point of 184°C.
  • Graphitic carbon has a very high melting point above 3000°C.

Molecular vs Network Covalent Solids

  • Non-metals that are molecular solids tend to have low melting points and boiling points.
  • Non-metals that are network covalent solids, like graphite and diamond, have extremely high melting points.
  • Gallium (Ga) is a metal with a low melting point of 30°C and can melt in your hand, but it has a very high boiling point.
  • Mercury (Hg) is a liquid metal.
  • Most metals have high melting points and boiling points.

Metals vs. Non-metals: Ion Formation

  • Metals, found predominantly on the periodic table's bottom left, readily form positive ions upon reaction, like calcium forming Ca2+.
  • Non-metals either do not form ions, like carbon or form negative ions, like chloride forming Cl-.
  • Elements on the periodic table's left side have few outermost shell electrons.
  • Group 2 elements such as calcium, with two outer electrons, easily lose them to form positive ions.
  • Elements like chlorine, needing to lose seven electrons to become positive ions, do not due to high energy requirements.
  • Metals' reactivity increases down the periodic table.
  • Elements lower down have more electron shells (e.g., lead with six shells).
  • Outer electrons in elements far down the table are less tightly held by the nucleus.
  • Weaker nuclear attraction leads to easier electron loss and positive ion formation, increasing reactivity.

Metallic Bonding and Properties

  • Metals exhibit metallic bonding, a strong bond type unique to metals.
  • Metallic bonds are responsible for metals' physical properties.
  • Metals are malleable, capable of being bent or hammered into shape without breaking.
  • Metals are excellent heat and electricity conductors.
  • Metals are often used in electric wires.
  • Metals typically have high melting and boiling points, some remaining solid even at 2,000°C.
  • Metals are shiny and sonorous, creating a ringing sound when struck.

Properties of Non-metals

  • Non-metals are typically dull in color and brittle (e.g., carbon in pencils).
  • Non-metals generally have low melting and boiling points, with many being gaseous at room temperature.
  • Non-metals are poor electricity conductors.
  • Non-metals have lower densities than metals, weighing less for a given volume.

Transition Metals: Properties and Uses

  • Transition metals, located centrally in the periodic table, possess typical metallic properties.
  • Transition metals can form multiple ions (e.g., chromium forming Cr2+, Cr3+, and Cr6+ ions).
  • Transition metal ions are often colored; aqueous forms can be blue, green, or orange.
  • Transition metals serve as effective catalysts, accelerating chemical reactions without being consumed.
  • Iron catalyzes the Haber process for ammonia production.
  • Nickel catalyzes the hydrogenation of alkenes in margarine production.

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