Atomic Structure
What are the 3 subatomic particles and their charges?
Protons - positive
Neutrons - neutral/no charge
Electrons - negative
What are the bonds called that hold oxygen and hydrogen together within a water molecule?
Polar Covalent bonds
What is a real life example of surface tension (come up with an example other than what we've done in lab).
A bug being able to walk on water.
Which property of water did the "Stop on a Dime" model demonstrate? (ONE answer)
Cohesion; the bubble that formed on the penny did not spill over because the water molecules held onto one another.
Who in class is a twin?
Melissa
Which subatomic particles determines the way that the atom interacts with other atoms?
Answer: electrons
The number of electrons in an atom's valence shell will determine how it interacts with other atoms; if an atom has 8 electrons in its valence, it will NOT interact with other atoms. If it has less than 8, it will interact to try to reach stability.
Which type of bond involves the transfer of electrons?
Ionic bonds
Why do water droplets stick to the leaves of plants after a rain storm?
Adhesion; water's ability to stick to other surfaces because of the hydrogen bonds and polarity.
Which property of water did the Strong (Wo)man model demonstrate (ONE ANSWER):
Adhesion; the two slides resisted being pulled apart because of strong hydrogen bonds in the water drop between the slides AND because the water was sticking to the sides of the slides.
Who works at Spirit Halloween?
Ezra and Ava
How do we determine the mass number of an atom?
Mass = Protons + neutrons
Why do hydrogen bonds form?
Due to the differing electronegativity of Hydrogen and Oxygen, electrons are shared unequally, and as a result, there are opposite charges present in H2O.
Hydrogen bonds form because the negative charge of Oxygen is drawn to the positive charge of Hydrogen.
Without this property of water, trees would be unable to maintain leaves.
Capillary action
Capillary action; the filter paper was touching the water. The water traveled up the filter paper and dragged the ink with it, spreading the color upwards.
What is Max's favorite ice cream flavor?
Strawberry
In a NEUTRAL atom, if you know the atomic number, what TWO other things do you know about the atom?
Answer: The number of protons AND the number of electrons.
An atom NEVER loses protons. Its electrons can change, and when they do, the atom becomes charged; no longer neutral.
What does a non-polar bond tell you about the electronegativity of the atoms involved?
If a bond between two atoms is non-polar, then they have the SAME electronegativity.
What causes cohesion of water molecules?
What TWO reactions did you observe in the Looney Balloony experiment (Ms. C's demonstration with the balloon)?
After rubbing the balloon on her hair, the charged balloon attracted Ms. C's hair and made it float toward the balloon.
After rubbing the balloon on her hair, the charged balloon attracted the stream of water from the faucet towards it.
^This is because the charged balloon had a negative charge and it attracted the positive charges present in the water.
What's Ms. C's dog's name?
Zoey
What has a higher electronegativity: Barium (Ba) or Chlorine (Cl)?
*You must use your periodic table to answer*
Chlorine! Electronegativity increases from left side of the periodic table to the right AND from the bottom to the top.
Give an example of a MOLECULE and an example of a COMPOUND. What is the difference between the two (hint - has to do with the type of bond).
Molecule - H2O (water); two or more atoms joined with a polar covalent bond.
Compound - NaCl (salt); atoms joined with an ionic bond.
Which property of water explains the reason why water can climb up the inside of a straw without any external forces applied?
EXPLAIN how this property works!
CAPILLARY ACTION;
The water molecules stick to the sides of the straw (adhesion) and also to each other (cohesion).
What is one way to know if you're looking at a model of a POLAR molecule?
If you see charges.
Who has a fear of Disney mascots (the big life sized characters with people inside)?
Nimah