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WorksheetsScience Test 1 (Semester 2) - Review
Total questions: 30
Worksheet time: 16mins
Our sun is made up of mostly:
Cesium
Hydrogen
Helium
Energon
Our sun is:
a tennis prodigy.
a yellow dwarf star.
a red giant star.
a white dwarf star.
The core temperature of our sun is approximately:
15 million K.
200 million K.
5 million K.
About a gillion degrees, give or take.
The surface temperature of our sun is about:
10 million K
5700 K
200 degrees Shmelvin
Room temperature
Plasma is unique, because:
It's gooey.
It's close to absolute zero (very cold).
It has the properties of solids, but at very hot temperatures.
The electrons actually exist outside the atom.
As opposed to nuclear fusion, fission involves:
Extremely fast moving particles.
Energy being released.
People in lab coats who yell at you if you misidentify a DC character as Marvel.
Separation of an atom into two.
Helium is made when:
Two hydrogen atoms collide.
When a hydrogen atom collides with a helium isotope.
When a tritium atom collides with a deuterium atom (emitting a neutron).
When two tritium atoms collide.
Heavy water is called such, because:
As opposed to H20, D20 involves deuterium.
As opposed to H20, D20 involves protium.
As opposed to H20, D20 involves tritium.
How many neutrons does tritium have?
1
2
3
4
These Fe atoms are:
ions
allotropes
Isotopes
This diagram shows the number of _________ __________ in sulfur.
total electrons
valence electrons
free protons
bonded protons
Silicon has how many valence electrons?
2
3
4
5
Magnesium (Mg) has how many valence electrons?
1
2
3
4
Elements in period 3 have how many energy levels (electron orbitals)?
1
2
3
4
Aluminum (Al), by itself, has an oxidation number of:
0
1
2
3
Mg2+ has an oxidation number of:
0
1
2
3
Cl- has an oxidation number of:
-1
0
1
2
O2 has an oxidation number of
0
1
2
3
In a compound, O (usually) has an oxidation number of:
-2
-1
0
2
In water (H20), the hydrogens have what oxidation number?
-1
1
0
1
For neutral compounds, the oxidation number should equal:
-1
0
1
2
The oxidation number of sodium (Na) in NaCl is:
-1
0
1
2
Oxidation numbers describe:
Why protons are only in the nucleus.
How many electrons are lost or gained in a reaction.
How many electrons are created in a reaction.
The minimum amount of activation energy needed.
An anion has:
More protons than electrons.
More electrons than protons.
A neutral charge.
A positive charge.
A chlorine (Cl) atom has 18 electrons. This atom has a charge of?
-1
0
1
2
A sodium (Na) atom has 10 electrons. Its charge is:
-1
0
1
2
An easy way to figure out the charge of an ion is to:
Subtract the number of electrons from protons (protons - electrons)
Subtract the number of protons from electrons (electrons - protons)
Divide the atomic mass in half.
Divide the number of neutrons in half.
If an atom is reduced, it has:
Lost electrons
Gained electrons
Acquired more protons.
Acquired more neutrons.
To find the number of moles of an atom, simply (not a test question, but maybe extra credit):
Add the word "grams" to the atomic mass of an atom.
Add the word "grams" to the atomic number of an atom.
Divide the atomic mass by 1 L of water.
Multiply the atomic mass by 1 L of water.
Molarity =
Number of moles/1 L of water
Atomic number/1 L of water
Valence Electrons/1 L of water
Neutrons/1 L of water.
