Bellwork for Thursday, 11/16
What are the hazards of dihydrogen monoxide?
Bellwork for Wednesday, 11/15
What types of bonding are present in the room around us?
Bellwork for Tuesday, 11/14
Why do electronegativity differences between 0.3 and 1.7 result in "polar" bonds?
Bellwork for Monday, 11/13
Given cation: NH4+ and anion: O22-
Write the formula and the name of this ionic compound.
Bellwork for Friday, 11/10
Why do citric acid and sucrose melt at a lower temperature than sodium chloride and potassium chloride?
Bellwork for Thursday, 11/9
Name 3 pieces of lab safety equipment, their locations, and when they should be used.
Bellwork for Wednesday, 11/8
Where do the cation's missing electrons go?
What holds ionic compounds together?
Bellwork for Tuesday, 11/7
Find the error:
Sodium (I) fluoride
Bellwork for Monday 11/6
Name the following:
Bellwork for Friday 11/3
Name the following:
Write the formula for aluminum oxide.
Bellwork for Thursday, 11/2
What charges can Ti ions have?
Write 1-4 in Roman numerals.
Bellwork for Wednesday, 11/1
Will Li form an anion or a cation? F? Ti?
Bellwork for Tuesday, 10/31
What's the best Halloween candy?
Bellwork for Monday, 10/30
What are the following equations used for?
c = [lambda] x f
E = h x f
Bellwork for Friday, 10/27
Define a mixture.
What makes a mixture heterogenous?
Bellwork for Thursday, 10/26
Determine the number of significant figures in the following:
Bellwork for Wednesday, 10/25
How do we dilute acids?
How many mm in a km?
Bellwork for Tuesday, 10/24
Which subshells can hold valence electrons?
Bellwork for Monday, 10/23
What is the force between the nucleus and the electrons?
Between the electrons themselves?
Bellwork for Friday, 10/20
What changes about atoms as we move from left to right on the periodic table?
From top to bottom?
Bellwork for Thursday, 10/19
What groups of elements on the period table have similar outer electrons?
Bellwork for Wednesday, 10/18
Why do we use Math in Chemistry?
What is the job of a mathematical formula?
Bellwork for Tuesday, 10/17
Why do we use the letter c to represent the speed of light?
What does a wavelength measure?
Bellwork for Monday, 10/16
Why did the color of the flame change in our lab?
What does the environment of the flame do to electrons?
Bellwork for Friday, 10/13
What is an electron doing when it emits light?
What makes different colors of light different from one another?
Bellwork for Thursday, 10/12
What principle limits the number of electrons in an orbital?
Why do we draw up and down arrows to represent electrons sharing an orbital?
Bellwork for Wednesday, 10/11
No Bellwork was given (PSAT testing)
Bellwork for Tuesday, 10/10
1) How many electrons can fit in a single orbital?
2) Write the electron configuration for Si.
We had a quiz on Atomic Theory, Atomic Structure, Average Atomic Mass, and Nuclear Decay on Tuesday, 10/3!
Bellwork for Friday, 9/29
If your birthday element were to undergo a beta decay, what element would it become?
Bellwork for Thursday, 9/28
What percent of an isotope remains after 5 half lives have elapsed?
Bellwork for Wednesday, 9/27
Write an equation for the alpha decay of Uranium-238.
Write an equation for the beta decay of Dysprosium-165.
Bellwork for Tuesday, 9/26
The sun gets its energy from the _____ of _____ into _____.
Bellwork for Monday, 9/25
Given Carbon-12 with an atomic mass of 12.000 amu and an abundance of 98.89%, and Carbon-13 with an atomic mass of 13.003 amu and an abundance of 1.11%, what is the average atomic mass for Carbon?
This week we learned about atomic structure and isotopes. We performed a lab activity to learn how to calculate the average atomic mass.
As of this point in time, you should be able to identify the parts of atoms, know how to identify elements given the number and type of subatomic particles, calculate the charge of an atom, write the isotopic symbol for an atom, and calculate the average atomic mass when given the atomic masses and relative abundances of naturally occurring isotopes.
We had a test over Matter on Friday, 9/15/17!
On Friday 9/15, the review packet (with evidence of use) was due.
Also on Tuesday the "Atom Foldable". Link in sidebar to .ppt file.
Friday, 9/22 Bellwork:
What would be the isotopic symbol for an atom with three protons and four neutrons in its nucleus?
What is the charge of the subatomic particles found outside the nucleus?
Thursday, 9/21 Bellwork:
Draw a representation of the following atoms: Lithium-7, Helium-4, Hydrogen-2
Wednesday, 9/20 Bellwork:
- Where in/among the atom are the three subatomic particles located?
- Write an equation for mass number.
- What changes about an atom when we change the number of protons? When we change the number of neutrons? When we change the number of electrons?
Tuesday, 9/19 Bellwork:
For your Birthday Element find the:
- average atomic mass (consult periodic table)
- estimate a mass number
- provide the number of protons, neutrons, and electron of a neutral atom of your birthday element with your estimate mass number.
Monday, 9/18 Bellwork:
Take the digits of your birthday
(e.g., March 12th = 12) and look up the corresponding element by atomic number (e.g., 12 = Mg). This is your "birthday element". Write down all the info provided on periodic table.
Friday, 9/8, the following items were due:
- Week 5 Bellwork
Bellwork for Friday 9/8:
- What are the parts of an atom?
- If we could enlarge a baseball (and all its parts) to be the size of the earth, how big would its atoms become?
Bellwork for Thursday 9/7:
Given the following substance properties, find the densities and determine the order in which they would float on one another:
A) 4.0 g 2.5 ml
B) 2.5 g 1.2 ml
C) 3.2 g 4.1 cm3
D) 6.3 g 3.4 cm3
Bellwork for Wednesday 9/6:
Given molecule H2SO4
1) Determine molecular mass
2) Determine percent composition by mass of hydrogen
3) Determine percent composition by mass of sulphur
Bellwork for Tuesday 9/5:
1) What is the rule for multiplication and division with significant figures?
2) What is the rule for addition and subtraction with significant figures?