Sig Figs and Measurements
Write is 2.9x10-4 in standard form with 5 sig figs
0.00029000
Write an equality for days and hours
1 day = 24 hours
24 hours = 1 day
Identify each as an element compound or mixture
A) chlorine
b) salt
c) water (H2O)
d) salt water
A) element
B) compound
C) compound
D) mixture
What alkaline earth metal is in period 2
Be
Rank the following types of EM radiation from most to least energy
Blue light, yellow light, UV, infrared, microwave, gamma
Gamma, UB, Blue, Yellow, Infrared, Microwave
How many sig figs do each of the following have?
a) 4.50
b) 90080
c) 50.
d) 0.000780
a) 3 b) 4 c) 2 d) 3
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They take 400 of your points
List
a) 2 physical properties
b) 2 chemical changes
a) color, luster, shape, length, mass, volume, conductivity etc
b) rusting, burning, cooking, rotting, reacting, etc.
The Lewis structure is an element found in period 3.
a) What element is it?
b) what is the name of the group/family it is in?
a) Cl b) halogens
A substance has a half life of 14 minutes. How long will it take for the substance to decay to 12.5% of the original substance?
42 minutes
Give the correct reading for each instrument.
2.3 cm
35.5 mL
6.60 mL
If you go to school for 180. days each year and each day is 7.0 hours long, how many minutes do you spend at school each year?
76000 minutes
What does A and D represent on the graph
A) Soldi(ice) D) Evaporation
For Magnesium-25 how many
a) protons
b) neutrons
c) valence electrons
a) 12 b) 13 c) 2
a)Write the alpha decay of 233Th
b) Write the beta decay of Magnesium-24
a) 233Th --> 42He + 229Ra
b) 24Mg --> 0-1e + 24Al
Calculate the following with correct sig figs
a) 54.4 x 0.80
b) 52.0 + 3.37 + 4.8
a) 44 b) 60.2
You’re traveling from Washington to Cedar Point in Sandusky, Ohio. The trip is 412 miles and you travel an average of 85 km per hour. How long will it take you to finish your trip?
7.8 hours
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Play RPS, best out of 3, for 400 points.
What element has the electron configuration of 2,8,1 ?
Na
You obtain 30.0 grams of a radioactive substance and within 24 hours only 1.875 grams remain. What is the half life?
6 hours
Determine the density, with correct sig figs and units, of the substance.
19 g/mL (2 sig figs due to subtracting volumes)
You are riding the Millenium Force at Cedar Point which has a top speed of 93 miles per hour. Convert this to meters per second.
41m/s or 42 m/s (depends on which set of conversion factors you use)
You’re getting ready to make a cup of tea (because you are now an old lady) so you put 50.0 mL of water on the stove at 72F. You end up forgetting about it in your dementia-riddled state and all of the water boiled away. How much energy did this take in kJ?
The heat of fusion of water is 334 J/g and the heat of vaporization is 2260 J/g. Density of water is 1g/mL. Specific heat = 4.184 J/gC
72F = 22.2C
To heat the water = 16200 J
Evaporate = 113000 J
Total = 129000 J = 129 kJ
What is the trend for increasing
a) ionization energy,
b) atomic radius,
c) metallic character
a) Up and right
b) Down and left
c) Down and left
What is the missing piece in the following fission reaction:
1n + 235U → 133In + ? + 31n + energy
100Tc