Significant Figures
How many significant figure in 01020?
3 sig fig
What is the symbol for Silver?
Ag
Determine the atomic mass of one chlorine atom.
35.45 amu
What is the number value and symbol of micro?
Number value: 10^-6
Symbol: µ
Select the uncertainty (a.k.a. the error) associated with the measurement of 20.60 kg.
±0.01 kg
2.1 + 45.15 - 11.31 = ?
35.9
The following show the element symbols and their name. Select all correct labels
V - Valium
Pb - Platinum
Cu - Copper
Cu - Copper
Determine the identification of a Period-3 element that belongs to the Chalcogen group.
S; Sulfur
Identify the exact number:
1 g = 1000 (10^3) kg
Both are exact
Identify the exact number:
1 kg = 2.205 Ib
1 kg is exact
2.205 Ib have 4 sig fig
12.50/ (1.31*5.201) = ?
1.83
Select all the correct statements:
I) The number of neutrons in an atom is always equal to the number of protons in the atom
II) An atom is an electrically neutral object
III) The mass of one electron is approximately equal to the mass of one neutron
II) An atom is an electrically neutral object
Arrange from smallest to largest:
Rb Ge Br
Br < Ge < Rb
Express 21.5 cg in scientific notation without using the metric prefix
2.15 x 10^-1 g
Determine the physical state of a particular substance, X, at -42.0 C by using the following data. Assume that pressure is 1 atm.
The melting point of X = -35.1 C
The boiling point of X = 19.1 C
Solid
Convert 27.7 C into F
81.9 F
Determine the number of valence electrons and valance shell # for an iodine atom.
Valence electron: 7
Valence shell (n): 5
Select one correct statement:
A) Na belongs to the alkali metal group, and F belongs to the halogen group
B) Elements in the same period in the periodic table tend to have similar chemical properties
C) The # of valence electron is the period #, and the # of shell is the group number
A) Na belongs to the alkali metal group, and F belongs to the halogen group
Convert 150.5 ng into mg
1.505 x 10^-4 mg
Convert 135.7 F to C
57.61 C
An empty container weighs 37.188 g. When the container is filled with water, it weighs 61.567 g, including the weight of the container. When the same container is filled with an unknown liquid instead of water, it weighs 66.910 g, including the weight of the container. What is the density (in g/mL) of the unknown liquid?
Assume that the density of water is 0.997 g/mL.
Round your answer to 3 sig fig
1.22 g/mL
The natural abundance of iron-58 (58^Fe) is 0.28%. How many iron-58 isotopes are present in 10000 iron atoms? Assume that you have exactly 10000 iron atoms
28
Determine the number of protons, the number of electrons, and the number of neutrons in one 56^Ca atom.
Protons: 20
Electrons: 20
Neutrons: 36
A 15.0-mL solution contains 0.65 mg of drug per mL of solution. The recommended dosage of this drug is 0.10 mg per kg of body weight. How many milliliters of this solution do you need to administer to a 176.5-lb patient.
Useful Info
1 kg = 2.205 lb
12 mL
One tablet contains 28 mg of a drug. The maximum daily dosage of the drug is 1.2 mg per kilogram of body weight for an adult. Determine the maximum number of tablets that a 137 -Ib patient can take in one day without overdosing. Assume that you cannot break the tablet into pieces
2 tablets