Chem 161 Homework Chapter 4

What is the name of this compound? CO

carbon monoxide

What is the name of the compound P₄O₁₀

tetraphosphorus decoxide

When bonds are formed, energy is released. In a water molecule, the two hydrogens are both bonded by single bonds to the central oxygen atom. The bond energy associated with an O-H bond is 463 kJ/mol. Again, using the balanced chemical equation shown above, how much energy is released in forming the O-H bonds?

1850 kJ

In an oxygen molecule, the two oxygen atoms are held together by a double bond with a bond energy of 495 kJ/mol. Using the balanced chemical equation (shown above), how much energy must be expended in breaking the O=O bonds?

496 kJ

In a hydrogen molecule, the two hydrogen atoms are held together by a single bond with a bond energy of 436 kJ/mol of hydrogen. In other words, to break the H-H bonds in one mole of molecular hydrogen requires the expenditure of 436 kJ of energy. Using the balanced chemical equation for the formation of water from oxygen and hydrogen (shown above), and interpreting the stoichiometric coefficients as mole amounts, how much energy must be expended in breaking the H-H bonds?

872 kJ

Chemical bonds hold atoms together in molecules. To break apart the atoms in a molecule requires energy sufficient to overcome the attractive force holding the atoms together. Based on this statement, when we break a chemical bond energy is _______.

Absorbed

Which of the following molecules contain an atom with an expanded octet? Choose one or more: A. ONF₃ B. SeO₂F₂ C. XeF₂ D. GeCl₃

B, C

What is the molecular formula for acetic acid?

CH3COOH

Give the formula for Covellite, copper(II) sulfide

CuS

Give the formula of Cuprite, copper(i) oxide

Cu₂O

Give the formula for Chalcocite, copper(I) sulfide

Cu₂S

What is the chemical formula for lithium bicarbonate?

LiHCO₃

What is the name of this compound? NCl₃

Nitrogen trichloride

What is the chemical formula for Strontium nitrate

Sr(NO₃)₂