Molecules & Atoms
Electron, proton, and neutron.
When a bond is formed, does it take energy or release energy? (Flori)
Release energy.
Which is more dense: A brick or a feather?
A brick is more dense. The density of brick is a little over 2000 kg m-3; the density of feathers is something around 2.5 kg m-3, nearly a thousand times lower than the brick. (if you're thinking of the riddle, that means 1 lb of feathers has a volume of about 1/5 of a cubic metre.)
Convert 3.87 x 10^3
3,870
What is freezing?
The changing of a substance from liquid to solid
If an atom has two electrons and three protons, what is the net charge of the atom? (Flori)
+1
How does a polar molecule molecule bond with another polar molecule? (Brayden)
A polar molecule bonds with another polar molecule because the positive and negative parts of a molecule bond.
How do you calculate the volume of an object?
Multiply length, width, and height.
Convert 6.78 x 10^8 to its full form.
678,000,000
What is it called when a substance changes from gas to liquid?
Evaporation.
Which atom in a water molecule is slightly more negative?
Oxygen
Why does salt dissolve better in water than in Isopropyl Alcohol? (Natasha)
Because water is more polar than the alcohol it is able to attract to the positive and negative ions of the salt better than the alcohol. This pulls the salt ions apart dissolving the salt.
How do you calculate the density of an object?
Divide the mass by volume.
Convert 8.98 x 10^12
8,980,000,000,000
What is evaporation?
The changing of a substance from liquid to gas.
What are isotopes? (Fatima)
Isotopes are the same type of molecule with same protons and electrons but a different number of neutrons.
If a molecule has two positive and two negative sides, is it polar? (Flori)
No
How do you calculate the mass of an object?
Multiply the density and volume.
Convert 35,000 to scientific notation
3.5 x 10^4
What is sublimation?
The changing of a substance from solid to gas.
Neutrons affect the ____ and ____ of an atom
Mass and stability
What is the charge of a chlorine ion?
-1
What is the atomic mass of water? (Bear)
The atomic mass of water is around 18g/mol
Convert 25,300,000,000,000 to scientific notation.
2.53 x 10^13
What is deposition?
The changing of a substance from gas to solid