What is the process of converting waste materials into new usable substances known as?
Digestion
Recycling
Reprocessing
Composting
Which property of metals is directly influenced by metallic bonds?
Low density
High melting points
Electrical insulation
Solubility in water
Which of the following properties is typically found in metals but not in nonmetals?
Ductility
Formability
Malleability
All of the above
Nonmetals are usually brittle and lack the malleability and ductility of metals
Flase
True
Which of the following metals is known for its metallic luster and ductility?
Graphite
Sulfur
Sodium
Carbon
Which of the following is the correct arrangement of the hardness of sodium 11Na, magnesium 12Mg, and aluminum 13Al?
Al > Na > Mg
Mg > Na > Al
Na > Mg > Al
Al > Mg > Na
Which property is most likely to be observed in a metallic element compared to a nonmetallic element?
Non-conductive nature
Brittle texture
Metallic luster
Which of the following best describes the appearance of most metals compared to nonmetals?
Opaque with no luster
Shiny with metallic luster
Transparent
Always liquid at room temperature
What property of metals allows them to be drawn into wires?
Brittleness
Poor thermal conductivity
Opacity
How are alloys typically expressed in terms of composition?
As homogeneous mixtures without fixed ratios
Using molecular formulas
Through their crystalline structures
As mixtures, usually not expressed in molecular formulas
All the following are properties of the sodium element, except ................
bad electrical conductor
formable
a metal
has metallic luster
Why are metals like copper, aluminum, and iron commonly recycled?
They are abundant in the earth’s crust
Their percentage in the earth’s crust decreases, and recycling is cheaper than extracting from ores
It is easy to extract them from their ores
Recycling is often more expensive than extraction
Which of the following is a reason for recycling metals rather than extracting them from ores?
Extracted metals are purer
It is difficult and costly to extract them from their ores
Metals are unlimited in ores
Recycling requires more energy
In metallic bonds, the metal atoms are:
Neutral.
Not present as individual entities
Charged as cations.
Charged as anions.
Which property is characteristic of metals that helps in their usage in wiring and cookware?
Thermal conductivity
Insulation properties
What is a characteristic feature of bronze compared to pure copper?
Bronze has a lower melting point than copper
Bronze rusts more easily than copper
Bronze is softer than copper
Bronze is harder than copper and does not rust.
What is the common property of both sodium and copper?
Melting point
Density
Physical state
Colour
Which of the following is an exception among nonmetals due to its use in dry cells and ability to conduct electricity?
Copper
Carbon in the form of graphite
Among the following, which is not a characteristic feature of metals?
Ability to form alloys
High electrical resistance
Which metals primarily compose bronze, an alloy used in jewelry and statues?
Copper and nickel
Copper and zinc
Copper and silver
Copper (95%) and tin (5%)
Which of the following questions helps in the classification of some elements to metals and nonmetals?
Is it brittle?
Is it liquid?
Is it solid?
Is it colored?
Element (X) its boiling point is 2807°C and its melting point is 1064°C. Which of the following is a property of element (X)?
Ductile
Brittle
Bad electrical conductor
Opaque
What term describes the force of attraction in a metallic bond?
The ionic bond between lattice structures
The attraction between positive metal ions and a cloud of free-moving valence electrons
The repulsive force between negative ions.
The attraction between neutral atoms.
Metals are typically malleable, meaning they can be hammered or rolled into thin sheets without breaking
False
Which of the following is a characteristic electron configuration of the last energy level in most metals?
1, 2, or 3 electrons
5, 6, or 7 electrons
4 electrons
8 electrons
In the structure of a metallic crystal lattice, what role do the valence electrons play?
They move freely within the lattice.
They form covalent bonds between metal ions
They are tightly bound to individual atoms.
They are completely absent.
How do metals typically differ from nonmetals in terms of physical properties?
Nonmetals have high melting points.
Metals are good electrical and thermal conductors.
Nonmetals are ductile and malleable.
Metals are brittle and non-lustrous.
What is the arrangement of atoms in solid metals known as?
Ionic lattice
Covalent lattice
Metallic crystal lattice
Molecular lattice
What is a common characteristic of nonmetals like carbon and sulfur?
High thermal conductivity
Brittleness and opacity
High electrical conductivity
Why are pure metals often combined to form alloys for industrial use?
Pure metals are too hard
Pure metals are soft and unsuitable for most industrial applications.
Pure metals are non-conductive
Pure metals are too expensive.
What is responsible for the high melting points and hardness of metals?
Hydrogen bonds
Covalent bonds
Metallic bonds
Ionic bonds
Which of the following statements is true regarding the physical state of metals and nonmetals?
Nonmetals are only gases.
Nonmetals are either solids or liquid , except bromine, which is a gas.
All metals are solids except mercury, which is a liquid.
All metals are liquids except mercury, which is a solid.
What is an alloy?
A compound of a metal and a nonmetal
A pure metallic element
A mixture of two or more metals or metals with nonmetals, which does not have a molecular formula
A synthetic metal
What is the primary application of bronze alloy ?
Jewelry, medals, and statues
Electrical wiring
Automotive parts
Aerospace components
How does the number of valence electrons affect the hardness of metals?
Hardness is only affected by atomic mass.
The number of valence electrons has no effect on hardness.
Hardness increases with an increase in valence electrons.
Hardness decreases with an increase in valence electrons.