Who was the first person to think up the possible existance of the atom
Democritus
100
Please give me a physical property of the white board
answers will vary
100
Please give an example of a non-metal
Answers will vary
100
In an ionic bond, electrons are ________________.
Gained and lost
100
Which part of the atom does nuclear chemistry involve?
The nucleus
200
Which scientist stated that electrons move in orbits around the nucleus
Niels Bohr
200
What is a heterogeneous mixture?
A mixture where the substances are easily distinguished (able to be told apart)
200
How many energy levels does an atom of Molybdenum (Mo) have?
Five (5)
200
A ___________________ reaction releases energy.
Exothermic
200
One of the major differences between chemical reactions and nuclear reactions is what?
Nuclear reactions involve the nucleus (protons and neutrons) and chemical reactions involve electrons.
300
What is the center of the atom called and which subatomic particle(s) are found in it? (must get it all correct for the points)
Nucleus- protons and neutrons
300
Which of the following is an example of a pure substance?
a. kool-aid
b. cup of dirt
c. glass of water
d. glass of lemonade
c. glass of water
300
Iodine would have chemical properties MOST like:
a. Manganese (Mn)
b. Tellurium (Te)
c. Chlorine (Cl)
d. Xenon (Xe)
c. Chlorine (Cl)
300
What subatomic particle is responsible for atoms forming bonds?
Electrons
300
The most common place to see nuclear fusion is where?
In the stars like in our Sun
400
What is the currently accepted atomic model?
Electron Cloud model
400
Define what a compound is.
Two or more elements chemically combined in a fixed ratio
400
The group of the most reactive metals is the...
Alkali Metals (group 1)
400
Most elements want to have how many valence electrons to be considered stable?
Eight (8)
400
True or False? Nuclear reactions involve a large amount of energy either being used or released.
True
500
Calculate the number of protons, neutrons and electrons in vanadium-52.
Protons- 23
Neutrons- 29
Electrons- 23
500
According to Charles' Law, volume and temperature are directly related. This means that if a gas sees an increase in temperature, it should see an _______________ in volume.
increase
500
Element X reacts with oxygen (O) to produce compound X2O. Which element is most likely X?
a. Sodium (Na)
b. Calcium (Ca)
c. Aluminum (Al)
d. Sulfur (S)
a. Sodium (Na)
500
Which of the following is not evidence of a chemical reaction?
a. Energy
b. A precipitate (solid)
c. A color change
d. A change in state (example solid to liquid)
d. A change in state
500
A rock sample contains 80g of potassium-40 isotope with a half-life of 1.25 billion years. How much potassium-40 isotopes will remain after 2.5 billion years?