Chem review
The number 200,000 expressed in scientific notation is
2.0 x 10^6
How many neutrons are present in a 234/91 Pa nucleus?
234-91=143 neutrons
How many electrons are present in a bromine atom with a mass number of 87?
35
How many significant figures are in the number 6.022 × 10^32?
4
The number 4.89 rounded to two significant figures is
4.9
Express 506100 in scientific notation
5.06100 x 10^5
The number 0.005802 expressed in scientific notation is
5.802 x 10^-3
How many protons are in the atom 14/6 C ?
6
Express 6930 in scientific notation.
6.930 x 10^3
The number of neutrons in 7/3 Li is
7-3=4 neutrons
The number 0.0000074 expressed in scientific notation is
7.4 x 10^6
Using the rules of significant figures, calculate the following: 6.167 + 70 =
76
The product of 0.1400 × (6.02 × 10^23) will have how many significant figures?
8.43 x 10^22
The number of protons in 200/80 Hg is
80
How many electrons are present in a fluorine, F, atom?
9 electrons
An atom with 46 protons has a mass number of 102. The atom is
A. U B. Pd C. Ba D. No E. None of the above
The correct name for the Al3+ species is
Aluminum ion
The compound BF3 is named
Boron triflouride
The formula for calcium hydrogen sulfate is
Ca(OH)2
Burning of toast is a physical or chemical change?
Chemical change
Fermenting of orange juice is a physical or chemical change?
Chemical change
Is cooking an egg a physical or chemical change?
Chemical change
Define a liquid
Definite volume but no definite shape
The correct name for P2O5 is
Diphosphorous pentaoxide (type 3 naming)
Define a solid
Has a definite shape and definite volume
The correct name for FeO is
Iron 1 oxide
The SI prefix that corresponds to a factor of 10^3 is
Kilo
The fundamental unit of mass in the metric system is the
Kilogram
The name of the compound Pb(NO3)2 is
Lead 2 nitrate
The name for Li2O is
Lithium oxide
The name for Hg2^ 2+ is
Mercury ion
Define a gas
No definite shape or volume
Melting of snow is a physical or chemical change?
Physical change
Separating water from sand is a physical or chemical change?
Physical change
The correct name for Na2O is
Sodium oxide (type 1 naming)
What is the formula for Titanium(IV) oxide
Ti2O4
What is the formula for xenon tetrafluoride?
XeF4
Define matter
a. "Stuff" b. Object that contains a mass c. Composed of atoms
Define a physical change
a. A change that only changes the appearance of a substance b. Can return to its original state A. Ex: Melting of ice
Define a chemical change
a. A reaction which changes the chemical structure of a compound b. Typically the substance cannot return to its physical state. A. Ex: Explosion of fireworks
Metal:
● Brittle ● Metallic luster ● Can be easily shaped ● Good conductor of electricity and heat ● Positive charge
Transition metal: (metal)
● Good conductors of electricity and heat ● Varied in charges ● Good conductor of heat and electricity ● Type II Naming
Alkali: (metal)
● Highly reactive metals ● +1 charge ● Good conductors of heat and electricity ● Type I naming
Halogens (non-metal)
● Highly reactive nonmetals ● Poor conductors of heat and electricity ● -1 charge
Electron:
● Negatively charge subatomic particle
Neutron:
● Neutrally charged subatomic particle
Noble gas (non-metal)
● Non-reactive nonmetals ● Charge of 0
Non-metal
● Poor conductor of electricity and heat ● Negative charge
Proton:
● Positively charge subatomic particle ● Defines atomic number
Alkali Earth: (metal)
● Reactive metals but not as reactive as alkali ● +2 charge ● Good conductor of heat and electricity ● Type I Naming
Metalloid
● Semi-conductor ● Can have positive or negative charge
What is the result of the following multiplication expressed in scientific notation to the correct number of significant figures? (2.08 × 10^5)(7.0 × 10^-5)
14.6
The number 14.809 rounded to three significant figures is
14.8
An atom with 45 protons has a mass number of 100. It must contain how many neutrons?
100-45=55 neutrons
How many protons are in the nucleus of a Mg atom?
12
Using the rules of significant figures, calculate the following: 14.8903 - 2.14 =
12.75
The number 0.001 expressed in scientific notation is
1.0 x 10^-3
