Math Review
14x + 37 = 7x + 89
x = 7.43
How many mL are in a Liter?
1000 (or 103)
Name three examples of a physical property. (Do not list physical changes)
Shape, color, melting point, boiling point, physical state of matter
What is the name of the element abbreviated "K" on the periodic table?
Potassium
If 56 calories in a Kit Kat come from fat, how many grams of fat are in the Kit Kat?
6.2 g
a) What is the basic equation of a line?
b) How would we calculate the slope of a line?
a) y = mx + b
b) rise/run ((y2 - y1)/(x2 - x1))
How many nanometers are in 32 meters?
32,000,000,000 or 3.2 x 1010
Define heat.
Energy associated with the movement of atoms.
True or False: Isotopes can be found in nature.
True
At 0 C, a liquid freezes and loses 320 J of heat. What is the mass of the sample?
0.96g
73 + 32 = ?
352
What is the volume of a bouncy ball that weighs 0.30kg? (density = 3.5 g/ml)
86 ml
Define Sublimation
Solid particles change directly into a gas
The alkaline earth metals are found in which period of the periodic table?
This is a trick question, or the answer is 2-6. Periods are rows across the periodic table; alkaline earth metals are a group up and down (group 2).
If a 0.90kg piece of gold is heated from 45.2 to 50.2F, and this produces 60. J of heat, what is the specific heat of gold using grams in the denominator?
.013 J/g*K
A Cheeto's exact measurement is 2.3467. However, we measure this Cheeto using a ruler with markings every 1 cm. What should we report the length of the Cheeto as, given the limitations of our ruler?
2.3 cm
475 Kelvin is equivalent to how many degrees Fahrenheit?
395 F
What is the charge of the nucleus of an atom?
Positive charge (protons have a positive charge and neutrons have a negative charge)
Name 3 elements found in group 17 of the periodic table, and identify the name of the group.
F, Cl, Br, I, At, Ts
Halogens
A 36g silver ring is heated to 85 C, generating 78 J of energy. If the specific heat of silver is 0.345 J/g*K, what was the starting temperature of the ring?
78 C
Rubber has three components - silicon, which makes up 42%, latex, which makes up 25%, and the remainder is made up of isoprene. How much does the isoprene in a 56g sample of rubber weigh?
18g
You decide that for your New Year's Resolution, you will run 3.00 km every day. If you keep this up for an entire year, how many miles have you run at the end of the year? (1 mile = 1.609 km)
681 miles
Define mass number.
Represents the number of particles found in the nucleus of an atom
Can you have an odd mass number? Why or why not?
Yes; because you can have unequal amounts of protons and neutrons.
Lithium has an elemental atomic mass of 6.941 u and has two naturally occurring isotopes, 6Li and 7Li. Their masses are 6.0151 u and 7.0160 u respectively. What are the natural abundances (to 2 decimal places in percentage) of the isotopes of Lithium?
6Li: 7.49%
7Li: 92.51%