Atomic Struct and PT
What term means the attraction for an electron in a chemical bond?
electronegativity
Which nuclear particle (alpha, beta, or gamma) would be attracted to a negative plate in an electric field?
alpha
Draw the lewis dot for CH4. Is this a polar or nonpolar molecule?
nonpolar (symmetrical)
Which of the following is a mixture?
A. NaCl(s)
B. Br (l)
C. KCl(aq)
D. NaNO3 (g)
KCl (aq)
Given the following equation:
2H2 + O2 --> 2H2O
How many moles of water can be produced from 4 moles of O2?
8 moles
2-7-5
2-8-3-1
1-8-5
What are the conditions for temperature and pressure for an ideal gas?
high temperature and low pressure
Based on the equation below fill in the blanks:
F2 --> F + F
Bonds are being _________ and energy is _______
Bonds are being broken and energy is absorbed
Which of the following is most soluble?
A. PbCl2
B. Na2CO3
C. Sc(OH)3
D. Hg3PO4
B. Na2CO3
What happens to the atomic radius as you go down group 2?
increaes
When an electron goes from the excited state to the ground state energy is _____________
released
Fill in the missing species in this nuclear equation and indicate if it is natural or artificial transmutation
___ --> 23292U + 0-1e
23291Pa and natural transmutation
Draw a lewis dot structure for water
show me
How many grams of KNO3 can dissolve in 100 grams of water at 50 degrees celsius
83 g
Draw the structure for 3-hexanone
show me
How many neutrons are in the isotope 7232Ge
40 neutrons
Which releases the most energy?
A. synthesis
B. fusion
C. single replacement
D. double replacement
B. fusion
In what type of chemical bonding is there a sharing of electrons?
covalent
How many moles are in 3.5 L of a 2 M solution?
7 moles
Given the following equation:
2H2 + O2 --> 2H2O
How many grams of of oxygen is needed to produced 12.5 grams of water using 1.4 grams of hydrogen?
11.1 g
Show a numerical set up for calculating the average atomic mass of carbon given the following isotope data:
C-12 percent abundance 95%
C-13 percent abundance 5%
12.05 amu
A gas at a volume of 5 L is at a temperature of 275 K. What will the new volume be if the temperature is changed to 200 K at a constant pressure? (to the 10ths)
3.6 L
Which of the following will have the highest boiling points?
A. HI B.HF C. HCl D. HBr
B: HF (greatest electronegativity difference)
Calculate the concentration in ppm if 20 grams of NaCl in 300 grams of water
62500 ppm
What happens to the potential and kinetic energy during boiling?
PE increases KE stays the same