Where are the transition metals on the periodic table? Be specific (give the group numbers)
In the middle (groups 3 - 12)
100
What does helium (He) bond with?
Nothing - it's a noble gas!
100
What is the difference between the structural formula and the molecular formula?
Molecular formula only shows what atoms are present and how many there are. The structural formula also shows how the atoms are bonded together.
100
What is the LD50?
The amount of a substance required to kill half of the subjects.
100
Which way does energy transfer?
From higher temperature to lower temperature
200
What is the formula for atomic mass?
protons + neutrons (p+ + n0)
200
What type of bonds are valence electrons able to move freely?
Metallic Bonds
200
What is the difference between polar and nonpolar molecules?
The electrons are shared equally in a nonpolar bond and unequally in a polar bond.
200
Which is more toxic, a substance with a high (large) lethal dose or a low (small) lethal dose? Why?
small lethal dose - it takes less of it to kill you.
200
What is the most dangerous type of radiation?
Gamma radiation
300
What are the numbers in an isotope symbol?
top number = atomic mass
botton number = atomic number
300
What is the difference between ionic bonds and covalent bonds?
Electrons are transferred in ionic bonds and electrons are shared in covalent bonds.
300
What do the dots in the Lewis Dot structure represent? Be specific.
Valence electrons
300
What is the molar mass of NaOH? Include units.
40 g/mol
300
What type of radioactive decay is represented by the following decay scheme: U-238 --> Th-234 + He-4
Alpha decay
400
Balance the following equation: ___Au2S3 + ___H2 --> ___Au + ___H2S
What is Au2S3 + 3H2 --> 2Au + 3H2S
400
What is the chemical formula for the ionic compound with Aluminum and Oxygen
Al2O3 (Al3+ and O2-)
400
Which element has a higher electronegativity value - Carbon or Nitrogen?
Nitrogen
400
How many moles are in 12 g of NaCl? Show your work.
0.52 mol NaCl
400
If you hand is 90 degrees F and your cup of coffee is 80 degrees F, will the coffee feel hot or cold? Why?
The coffee will feel cold because the energy is moving away from your hand to the coffee.
500
What is the difference between an intensive and an extensive property?
Intensive property does not depend on how much (color) and an extensive property does depend on how much (mass)
500
What is the chemical formula for calcium hydroxide?
Ca(OH)2
500
What is electronegativity?
The ability of an atom to attract bonded pairs of electrons.
500
If you have 10 g of H2, how many grams of H20 would be produced? Show your work. Use the following balanced equation: SnO2(s) + 2 H2(g) → Sn(s) + 2 H2O(g)
90g H2O
500
What is the relationship between pressure and volume? If volume goes up what happens to the pressure?
Inverse relationship - if volume goes up, pressure goes down.