Measurements & Units
Atoms & Molecules
Atom & Molecular Structure
Describing Matter
Chemical Reactions
100
A strip of paper has a length of 14 cm. What is the length of the strip of paper in mm?
140 mm
100
What will you find inside the nucleus of an atom?
protons & neutrons
100
What is an isotope?
A version of an element with a different number of neutrons.
100
Name a physical and a chemical property of a substance.
Physical include: color, states of matter, density, odor, texture, boiling/melting points...
Chemical include: flammability, reactivity, types of bonds formed, toxicity, etc.
100
Name 2 indicators of a chemical reaction.
Light or sound given off; temperature change, color change, gas or solid formed; change is difficult to reverse.
200
Express 0.0000360 in scientific notation.
3.60 x 10-5
200
What is a cation?
a positively charged ion
atom that is missing electron(s)
200
Draw a Bohr model for an oxygen atom.
200
Name the state of matter that has atomic spacing that is close together with an indefinite shape.
liquid
200
How many molecules are in 0.360 moles of water?
2.17 x 1023 molecules
= 0.360 moles * (6.02 x 1023 molecules/1 mole)
300
How many significant figures are in 10,020?
4
300
What is the name of the molecular compound, N2O4?
dinitrogen tetraoxide
300
How many sublevels exist on energy level 3, what are they called and how many electrons can each hold?
3 sublevels (s, p, & d)
s holds 1, p holds 6 & d holds 10 electrons.
300
What is the volume of aluminum if it's mass is 25.0 g?
(Al density = 2.70 g/cm³)
67.5 cm3
v = m/d = (25.0 g) / (2.70 g/cm3)
300
Sn (s) + 2 HF (g) → SnF2 (s) + H2 (g)
How many moles of tin are needed to react with 3.6 moles of hydrogen fluoride?
1.8 moles
= 3.6 moles HF * (1 mol Sn/2 mol HF)
400
Convert 98.6o F to Celsius.
37 oC
98.6 oF = 9/5 * oC + 32 rearranges to oC = 5/9(98.6 - 32)
400
Name two techniques used to separate mixtures.
Any 2 of the following: filtration, magnetism, distillation, crystallization, chromatography, centrifugation, decanting.
400
Draw a Lewis dot diagram for PCl3 & name its geometric shape.
trigonal pyramidal
400
How many nitrogen atoms are in Mg(NO3)2 and what type of molecule is this?
6 N atoms
ionic compound (Mg is a 2+ metal cation & NO3- a polyatomic ion)
400
Write the balanced equation for the formation of C2H4O gas.
4 C (s) + 4 H2 (g) + O2 (g) --> 2 C2H4O (g)
500
A box measures 25 cm x 31 cm x 46 cm. What is its volume in cubic meters?
0.36 m3
= 0.25 m * 0.31 m * 46 m
500
What is the formula for iron (III) oxide?
Fe2O3
500
What is electronegativity & what is the trend for it in the periodic table rows & columns?
An element's ability to attract electrons.
Larger to the right & top of the periodic table.
500
Name 4 of the diatomic elements.
Br I N Cl H O F & As
bromine, iodine, nitrogen, chlorine, hydrogen, oxygen, fluorine (& astatine)
500
Write out the equation for the reaction between octane gasoline (C8H18) and oxygen that produces carbon monoxide and water. What type of reaction is this?
2 C8H18 (l) + 17 O2 (g) ->16 CO (g) + 18 H2O (g)
incomplete combustion