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level: Level 1

Questions and Answers List

level questions: Level 1

Question	Answer
Of the elements below. _____________ is the most metallic	d. K
Electronegativity _______________ from left to right within a period and ________ from top to bottom within a group	increases, decreases
Which one of the following pairs atoms is most likely to form an Ionic bond?	Na and F
This group is not able to conduct electricity or heat very well; are very brittle; Do not reflect light	Non-metals
Atomic radius generally increases as we move _______________	down a group and from right to left across a period
The order in which elements are arranged in a period of the periodic table depends upon	their increasing atomic number
Group where many elements are man-made and named after scientist	Rare Earth Metals (Lanthanides and Actinides)
Who created the periodic table and how it is organized?	Dmitri Mendeleev; atomic weight
What is group or family?	columns in the periodic table, stand for the # of valence electrons in the atomic structure
How many elements groups are there?	8
For which of the following pairs or elements would the compound formed between them most likely be a molecular compound?	N and S
This group contains salts and exist in all three states of matter (solid, liquid, gas) hint; almost completely stable atoms	Halogens
Electronegativity is a concept that is useful along with other concepts in	predicting the polarity of a bond
The ability of an atom in a molecule to attract electrons is best quantified by the ______________	electronegativity
What is period?	rows in the periodic table; stand for the # of electron shells in the atomic structure
SeCl6 + O2	SeO2 + 3Cl2
Which of the following has the greatest covalent character	SiCl4
What type of chemical bonding will be characterized by the N and Cl?	polar covalent bond
P4 + 3 O2	2P2O3
MgCl2 + Li2(CO3)	MgCO3 + O2
What is the correct formula for barium chlorate?	Ba(ClO3)2
In which of the following molecular compounds are all bonds single bonds	NH3
2 NO2 + O2	2O2 t N2
Fe + Cl2 -- FeCl3, what coefficient would balance the equation?	2,3,2
The chemicals that are created in a chemical reaction	products
What kind of reaction is it? 2KClO3 -- 2KCl + 3O2	Decomposition
When the following equation balanced, what is the coefficient for HCl? Mg(s) + HCl(aq) --- MgCl (aq) + H2(g)	2
What is the correct name for the compound CoCl2 ?	cobalt(II) chloride
The elements in group 1 have similar properties because	they all have a single electron in their outer shell
Molecular compounds are usually _________	composed of two or more nonmetallic elements
What is the correct formula for calcium dihydrogen phosphate?	Ca(H2PO4)2
Which of the following compounds contains the lead(II) ion?	PbO
Which of the following does not contain ionic bonds?	Sulfur dioxide
What is the correct name for Sn3 (PO4)2 ?	tin(II) phosphate
What is the correct formula for potassium sulfite?	K2SO3
If you rewrite the following word equation as a balanced chemical equation, what will be the coefficient and symbol for fluorine be? nitrogen trifluoride --- nitrogen + fluoride	3F2
When naming a transition metal ion that can have more than one common ionic charge, the numerical value of the charge is indicated by a __________	Roman numeral following the name
Based on the electronegativities K= 0.8, H= 2.8, which of the following statement is true	H2 is a nonpolar covalent molecule and HBr is a polar covalent molecule
Chemical equations must be balanced to satisfy the __________	law of conservation of mass
If the electronegativity difference between two atoms X and and Z is 1.0 the bond between the two atoms would be	polar covalent