Unit 4 Flashcards
Which gases are unreactive (inert)?
Noble gases, group 18
What is an ion?
an atom or group of atoms with a charge
What takes place in an ionic bond?
oppositely-charged ions attract, metal + nonmental
What takes place in a covalent bond?
electrons are shared between nonmetals
How many electrons are shared between two atoms in a double covalent bond?
4
How many electron pairs are ion Nitrogen on in NH₃?
3 bond pairs and 1 lone pair, 4 total
What type of bonding is found in a carbon dioxide molecule?
Covalent, 2 nonmetals bonding
What shape does a water molecule have?
bent
What molecular shape is SO₃⁻²?
trigonal pyramidal
In the Lewis dot structure, what do the dots represent?
valence electrons
What is the correct ionic symbol for strontium?
Sr²⁺ , all group 2 on the periodic table have a charge of ²⁺
What charge does group 1 ions have?
+1
Will group 1 atoms lose or gain an electron when forming an ion?
lose an electron
Will nonmetals, like sulfur, gain or lose electrons when forming an ion?
gain electrons
What type of bond does NaCl have?
Ionic, because it is between a metal and nonmetal
What type of bond does O₂ have?
nonpolar covalent, because the electrons are shared equally
What type of bond does HF have?
polar covalent, because the electrons are not shared equally
What is the correct name and formula formed between Sodium and Sulfur?
Sodium Sulfide, Na₂S (using the binary ionic bond rules Na⁺ and S⁻²)
Name 3 characteristics of a covalent bond.
1)electrons are shared, 2) poor conductors of electricity, 3)low melting and boiling points
Where are nonmetals located on the periodic table?
right side
Carbon dioxide has how many double bonds?
2
How many pairs of unshared electrons does H₂S have?
2
What geometric shape does BH₃ have?
trigonal planar
What geometric shape does CH₄ have?
tetrahedral
What is the name of the compound NiN?
Nickel (III) nitride, using the binary ionic rules for multivalence metals Ni⁺³ N⁻³
What is the name of the compound Fe₂S₃
What is the name of the compound Fe₂S₃ Iron (III) sulfide, using the binary ionic rules for multivalence metals Fe⁺³ S⁻²
What is the name of the chemical formula NH₄Br?
Ammonium bromide, using the polyatomic ionic rules for NH₄⁺ Br⁻
What is the name of the chemical formula for K₂CrO₄?
Potassium chromate, using the polyatomic ionic rules for K⁺ CrO₄²⁻
What is the name of the chemical formula for KCN?
Potassium cyanide, using the polyatomic ionic rules for K⁺ CN⁻
What is the name of the compound with a chemical formula P₄O₁₀?
tetraphosphorus decoxide, using the covalent rules
What is the chemical formula for carbon dioxide?
CO₂, using the covalent rules
What is the chemical formula for magnesium hydroxide?
Mg(OH)₂ , using the polyatomic ionic rules for Mg²⁺ OH⁻
If a compound has the ability to conduct electricity, is soluble and has a high melting point, the compound is most likely ____
ionic
What is the structure for CBr₄?
4 single bonds,
What type of bond would happen between an element from group 2 and group 17?
ionic, group 2 loses an electron, group 17 gains an electron
What is the correct Lewis structure for NH₃?
*
