Chemical Bonds Comprehension Questions 1

What do a lump of coal, diamond, and pencil lead have in common?

• They are all used for cooking
• They are all transparent
• They are all used for writing
• They are all made of carbon.

What is chemical bonding?

• Chemical bonding is the process of separating atoms in a compound
• Chemical bonding is the process of joining atoms together.

• Chemical bonding is the repulsive force between atoms in a compound
• Chemical bonding is the process of converting atoms into ions

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How are chemical bonds formed?

• By repelling electrons to fill their outer energy levels

• By sharing or exchanging electrons to fill their outer energy levels

• By losing electrons to empty their outer energy levels

• By absorbing electrons to increase their outer energy levels

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What happens when a chemical bond is formed?

• The atoms become unstable and break apart
• Atoms are held together by attractive forces.

• The atoms lose their electrons and become positively charged
• The atoms repel each other due to the opposite charges

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What are some properties of ionic compounds compared to covalent compounds?

• High solubility in water and low melting points

• Crystalline lattice structure and high flexibility

• High melting and boiling points and brittleness

• Low boiling points and high solubility in water

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NGSS.HS-PS1-3

What rule says that elements tend to form compounds that give each atom eight valence electrons?

• Octet rule
• Dodecet rule
• Eight is great rule

• Hexadecet rule

Why do covalent compounds generally have lower melting and boiling points than ionic compounds?

• Because it takes less energy to pull individual molecules apart.

• They have metallic bonding compared to ionic compounds.

• They have higher melting and boiling points compared to ionic compounds.

• They have stronger intermolecular forces compared to ionic compounds.

What is a property of ionic compounds?

• They are generally gases at room temperature.

• They are brittle and can shatter under pressure.

• 
  They have low melting points

• 
  They are very soluble in water.

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What type of bond is formed by the sharing of electrons between atoms?

• Covalent bond
• Metallic bond
• Hydrogen bond
• Ionic bond

What type of bond is formed when atoms transfer electrons?

• Ionic bond
• Metallic bond
• Covalent bond
• Hydrogen bond