chem unit 4
Which diatomic molecule has the largest dipole moment?
A dipole moment is a separation of charge within a molecule. A dipole moment occurs due to difference in electronegativity between the bonded atoms. Greater differences in electronegativity lead to a larger dipole moment. In this case, the differences in electronegativity values between hydrogen and fluorine is the greatest. Therefore, HF will have the largest dipole moment.
A neutral atom of Al has _ valence electrons.
A neutral atom of Al has 3 valence electrons.
Ca ion
A neutral atom of Ca has two valence electrons. In order to be isoelectronic with a noble gas, calcium will lose two valence electrons.
nitride ion
A neutral atom of N has 5 valence electrons. A nitride ion has a -3 charge, meaning it has 8 valence electrons.
Calcium sulfite
CaSO₃ Consider the charge of the ions to make sure the charges are balanced. For example, calcium forms ions with a +2 charge. Sulfite is a polyatomic ion that has a -2 charge. This yields the formula CaSO₃.
chemical formula for hydrobromic acid
HBr
chemical formula for the ammonium ion
NH₄⁺
chemical formula for the hydroxide ion
OH⁻
Write the chemical formula for sulfur dioxide
SO₂
chemical formula for the sulfate ion
SO₄²⁻
What is the correct IUPAC name for WO₂?
Tungsten(IV) oxide
What is the correct IUPAC name for Cr(BrO₃)₃?
chromium (III) bromate
What is the correct IUPAC name for NI₃?
nitrogen triiodide two nonmetals bonding end in -ide
What is the correct IUPAC name for HNO₂(aq)?
nitrous acid
What is the correct IUPAC name for HClO₄(aq)?
perchloric acid
What is the correct IUPAC name for H₃PO₄(aq)?
phosphoric acid
chemical formula for hypobromous acid
HBrO
chemical formula for chloric acid
HClO₃
Write the formula for sulfurous acid
H₂SO₃
formula for hydrophosphoric acid
H₃P
What is the correct IUPAC name for Fe(OH)₃?
Iron(III) Hydroxide
Which has the incorrect name-formula combination?
Iron(III) hydroxide - Fe₃OH Consider the charge of the ions to make sure the charges are balanced. For the transition metals, the charge is indicated in the name with a Roman numeral in parentheses. For example, iron(III) hydroxide indicates that the iron ion has a +3 charge. Hydroxide is a polyatomic ion that has a -1 charge. Three hydroxide ions would be needed to balance the charge on one iron ion. This yields the formula Fe(OH)₃.
chemical formula for krypton dichloride
KrCl₂
Write the chemical formula for tetraphosphorus hexasulfide
P4S6
chemical formula for phosphorus trihydride
PH₃
What is the correct IUPAC name for CaCO₃?
calcium carbonate
What is the correct IUPAC name for Cl₂O₇?
dichlorine heptoxide both nonmetals so greek prefixes
What is the correct IUPAC name for S₂Cl₈?
disulfur octachloride
Which of the following bonds is a nonpolar covalent bond?
fluorine-fluorine In order to be nonpolar, the two atoms in the chemical bond need to have the same electronegativity.
Which of the following bonds is a polar covalent bond?
hydrogen-chlorine Polar bonds occur between two nonmetals and have a difference in electronegativities of the atoms.
What is the correct IUPAC name for HIO₃(aq)?
iodic acid
What is the correct IUPAC name for Mn(CN)₂?
manganese (II) cyanide
What is the correct IUPAC name for PBr₃?
phosphorus tribromide
What is the correct IUPAC name for SeF₂?
selenium difluoride
What is the correct IUPAC name for Sn(ClO)₄?
tin (IV) hypochlorite
Water is a polar molecule because...
water is a bent molecule and oxygen is more electronegative than hydrogen
What is the correct IUPAC name for Y₂(CrO₄)₃?
yttrium (III) chromate
What is the correct IUPAC name for CuClO₃?
copper (I) chlorate
chemical formula for the chlorite ion
ClO₂⁻
What is the correct IUPAC name for Ca(IO₂)₂?
calcium iodite calcium is in alkaline earth metals so no roman numeral needed
Based on their positions in the periodic table, which of the following bonds is the most polar?
carbon-fluorine Polar bonds occur between two nonmetals and have a difference in electronegativities of the atoms. The further apart two atoms are in the same period, the greater the polarity of the bond.
