Unit 1: Atoms
Unit 2: Chemical Compounds
Unit 3: Chemical Reactions
Unit 4: Nuclear Chemistry
Unit 5: States of Matter
100
Which letter represents an electron?
W
100
What is the difference between ionic and covalent bonds?
Ionic bonds require + and - charges (transfer e-), while covalent bonds require the sharing of electrons
100
Is the following reaction balanced or unbalanced? How do you know?
4Al + 3O2→ 2Al2O3
It is balanced because the mass of the reactants is equal to the mass of the products
100
What is the difference between fission and fusion
Fusion combines small nuclei, while fission splits large nuclei
100
Which model is plasma? How do you know?
Model 1 because it has electrically charged particles
200
Boron is what type of element: metal, metalloid, or nonmetal?
Metalloid
200
What is the name of the compound with the formula CaI2?
Calcium iodide
200
Balance the equation
_H2 + _O2 → _H2O
2H2 + 1O2 → 2H2O
200
What is the half-life process
The time it takes for half the atoms of a radioactive substance to decay
200
Which state of matter has the most molecular motion?
A gas
300
An atom’s reactivity is determined by the number of _________
Electrons in its outer shell
300
What is the formula for the reaction between Lithium and Oxygen?
Li2O
300
A chemical equation is balanced when….
The same number of each kind of atom appears in the reactants and in the products
300
How many half-lives does it take for a radioactive substance to decay until only one quarter (1/4) of the original substance remains
Two half-lives
300
How is the volume of gas related to temperature?
They are in direct proportion to eachother
400
Which element reacts most similarly to Chlorine: Sulfur or Fluorine?
Fluorine, because they have the same # of valence electrons
400
Unknown element W has 2 valence electrons. Unknown element X has 7 valence electrons. What is outcome when elements W and X react?
WX2
400
Meredith mixes together 5 grams of baking soda and 5 grams of vinegar in a test tube that is not sealed. She then weighs the product and finds that it weighs 9 grams. Matthew conducts the same experiment, except in a sealed bag. He finds that 5 grams of baking soda and 5 grams of vinegar will result in 10 grams of product. What might account for their different findings?
Some of the mass escaped from the test tube as a gas before it was massed
400
What is the biggest risk associated with using radioisotopes in nuclear reactors?
If the radiation were to leak out of the reactors, it could cause significant damage to living organisms
400
What occurs when air is subjected to less pressure?
It expands
500
How many protons, electrons, and neutrons are in the element below
11 protons, 11 electrons, 12 neutrons
500
Unknown elements W and X formed the compound W3X during a reaction. If element W has one valence electron, element X MOST LIKELY has how many valence electrons?
5
500
Balance the following equation
__MnO2 + __HCl → __MnCl2 + __H2O + __Cl2
1MnO2 + 4HCl → 1MnCl2 + 2H2O +1Cl2
500
If Bismuth-212 has a half-life of 60.5 seconds, how many grams of the sample will be left after 121 seconds?
14.75 g
500
When a sample of a gas is heated at a constant pressure, the average kinetic energy of its molecules (increases or decreases) and the volume of the gas (increases or decreases)
kinetic energy increases and volume of the gas increases