Unit1
A question developed from an anchoring event that is investigated in order to develop an underlying explanatory model is called A) Claim B) Explanatory model or C) Neither
B) Explanatory Model
An electron located in the outermost shell of an atom is called A) Shell B) Valence electrons C) Nucleus
B) Valence Electrons
The smallest particle of an element is called?
A) Atom B) Valence Electrons C) Neither
A) Atom
Simplified model of an atom in the form of a diagram that represents the valence electrons of an atom in an element or compound particle is called, A) Molecular Geometry B) Lewis Dot Structures C) Electron Geometry
B) Lewis Dot Structures
Theoretical gas in which the molecules experience no attractive forces between themselves, have zero volume, and always undergo perfectly elastic collisions is called? A) Ideal Gas Law B) Charles Law C) Both D)None
A) Ideal Gas Law
Which element has the atomic mass (molar mass) of 12.011?
Carbon (C)
May able to ask for 1 hint.
18 (Argon)
Closest noble gas that doesn't pass your element.
What is the molar mass of this element C6H12O6. Must show/explain your work.
180.18 g/mol
Write down the bonding rules for these elements when it comes to drawing the Lewis structures. C, N, O, H.
Carbon = 4 bonds
Nitrogen = 3 bonds
Oxygen = 2 bonds
Hydrogen = 1 bonds
What is the formula of Density?
Density = Mass/Volume
Group 16, 6 valence electrons.
Which of the following is isoelectronic with a neutral nitrogen atom (NNN)?
(A) O+
(B) C−
(C) F+
A & B
what is the percent composition of Carbon (C) in CHO?
Must show/explain your work.
37.5% or 38%.
12/32 * 100
Draw the Lewis Structures of Water (H2O)? Must explain your steps and show your work.
Answer on the board.
can you write down the formula for combined gas law?
Answer on the board.
What is the electron configuration of Nickel (Ni)?
Long & short version.
1s22s22p63s23p64s23d8
[Ar]4s23d8
True or False: Answer both questions.
The number of protons changes.
The number of core electrons changes.
Both false, ONLY valence electrons can change.
On the board, I want you to draw the structural isomer of this element.
Answer on board.
Rank the following substances in order of increasing boiling point and explain the reasoning based on the types of intermolecular forces present:
CH4 < NH3 < H2O.
Weakest have lowest boiling point. Strongest have highest boiling point.
A 5.00 L container holds 0.200 mole of oxygen gas at a temperature of 298K.
What is the pressure of the gas in the container?
Use: 0.0821 for the R constant.
The pressure of the oxygen gas in the container is 0.978atm.
If there is 2.05 grams of Hydrogen, how many molecules does this element have? Must explain how you got the answer.
6.11×1023 molecules of H2.
Which element has a larger atomic radius: sodium (Na) or chlorine (Cl)? Explain your reasoning.
Sodium (Na) has a larger atomic radius because it has fewer protons and, therefore, a weaker attraction between its nucleus and outer electrons compared to chlorine.
What is the difference between an Ionic Bonding and Covalent Bonding?
Also write down what elements are being involved.
Electron Interaction
Transfer of electrons (Ionic Bonding)
Sharing of electrons (Covalent Bonding)
Elements Involved Metal + Nonmetal (Ionic)
Nonmetal + Nonmetal (Nonmetals)
SH2, (hint: must draw the Lewis structures)
what is the molecular geometry?
What is the electron geometry?
Is it polar?
Bent
Tetrahedral
yes
A sample of argon gas (Ar) contains 1.00 mole.
What is the volume of the gas in liters at standard temperature and pressure (STP)?
R constant is 0.0821.
22.41L is the volume.
Remember STP contains 1 atm, 1 mole, 273K.