Conversions/Sig Figs
What is the metric unit for weight, length, and volume?
gram, meter, liter
Define density and state it's equation
measure of how tightly packed a substance is. D = mass/volume
Which element is a nonmetal?
A. Sodium
B. Berillium
C. Bromine
D. Zinc
D. Zinc
What is the atomic number of tungsten?
74
Which of these have 3 sig figs? Select all that apply.
A. 4.2 x 10^3
B. 0.001
C. 245
D. 300
E. 1.02
C and E
How many milliliters are in 2.5 liters?
2500 mL
True or False: solids have a definite shape but not a definite volume
False. Solids have a definite shape and volume.
True/False: Atomic number is the number of protons in one atom of an element
True
How many valence electrons are in an atom of Boron?
3
2
How many centimeters are in 17.5 inches?
43.2 cm
True or false: gasses fill the volume of a container, spread far apart, and move fast
true
How many protons, neutrons, and electrons are in one atom of potassium?
protons = 19
electrons = 19
neutrons = 20
True or False: Ionization energy increases as one moves down a group on the periodic table
False.
How many kilojoules are in 70. Calories?
290 Joules
One 12.5 g serving of chips has 4.01 g of fat. Write a conversion factor for the percent of fat in chips.
(4.01g fat/ 17.7 g serving) x 100% = 22.7g fat/ 100 g food
A zinc piece weighs 80.82g. When placed in a graduated cylinder, the water level rises from 20.5 mL to 32.8 mL. What is the density of the piece of zinc?
6.57 g/ml
24.32
Define ionization energy
Energy required to remove one electron from an atom
True/false: copper pennies submerged in water is a homogenous mixture.
False
Convert 87.5 degrees Fahrenheit to Kelvin
304K
A patient needs a 4.05g dose of tylenol. How many mL will you administer? 1 dose of med = 1.55g/mL
3.02 mL
Calculate the number of neutrons with an atomic number of 25 and mass number of 83.
58 neutrons
Which element would have the most metallic character?
A. Potassium
B. Nitrogen
C. Barium
D. Aluminum
C. Barium
How many neutrons are in the isotope iodine 127?
74