Chemistry Questions

How did the oxygen atom and the hydrogen atoms become chemically stable?

• By sharing electrons to form a covalent bond

• By transferring electrons to form an ionic bond

• By gaining electrons to become negatively charged

• By losing electrons to become positively charged

What is the electron arrangement of a noble gas?

• 1s2 2s2 2p6

• 1s2 2s2 2p6 3s2 3p6

• 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

• 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6

Underline 4 common properties of covalent compounds.

• They have high melting and boiling points.

• They are usually gases or liquids at room temperature.

• They conduct electricity in molten state.

• They are soluble in non-polar solvents.

• They have low melting and boiling points.

Water (H₂O) is a polar molecule because:

• It has a symmetrical shape.

• The oxygen atom is more electronegative than the hydrogen atoms.

• It has an equal distribution of charge.

• The hydrogen atoms are more electronegative than the oxygen atom.

Imagine that you mix table salt with water, and the salt dissolves. Are the molecules of table salt polar or nonpolar?

• Polar

• Nonpolar

What does each symbol and number mean in the chemical formula for water?

• H represents hydrogen, O represents oxygen, and the number 2 indicates two hydrogen atoms.

• H represents helium, O represents oxygen, and the number 2 indicates two oxygen atoms.

• H represents hydrogen, O represents oxygen, and the number 2 indicates two oxygen molecules.

• H represents hydrogen, O represents oxygen, and the number 2 indicates two oxygen atoms.

Review the terms and their definitions in the Mini Glossary. What does the chemical formula of glucose, C₆H₁₂O₆, mean?

• It represents a molecule with 6 carbon, 12 hydrogen, and 6 oxygen atoms.

• It represents a molecule with 6 carbon, 6 hydrogen, and 12 oxygen atoms.

• It represents a molecule with 12 carbon, 6 hydrogen, and 6 oxygen atoms.

• It represents a molecule with 6 carbon, 12 hydrogen, and 12 oxygen atoms.

Which type of covalent bond involves the sharing of two pairs of electrons?

• Single bond

• Double bond

• Triple bond

• Quadruple bond

Making an outline of the lesson helps organize information about compounds, covalent bonds, and chemical formulas by:

• Providing a clear structure

• Increasing confusion

• Reducing the need for study

• Eliminating the need for notes