chem unit 4

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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.


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