Matter
Is sugar dissolving in water a physical or chemical change?
Physical change
How many significant figures is in the following number?
102.0
4 sig figs
Which subatomic particles are located in the nucleus?
Protons and neutrons
Noble gases are in column _____ on the periodic table
18
What is the formula for trinitrogen dioxide?
N3O2
Is tea an element, compound, homogeneous mixture, or heterogeneous mixture?
Homogeneous mixture
Write the following number in scientific notation:
0.00342
3.42 x 10-3
An atom emits energy in the form of light when an electron __________________________________.
Falls from a higher energy level to a lower energy level
The alkaline earth metal with the smallest atomic radius is __________
Beryllium (Be)
What is the name of Li2S?
lithium sulfide
Is density a physical property or a chemical property?
Physical property
How many significant figures would your final answer have after the following calculation:
32.1 x 2.0 x 1.500
Round to 2 sig figs
The electron configuration for helium is 1s2.
What does the 1 represent?
What does the s represent?
What does the 2 represent?
1 = energy level, s = sublevel, 2 = # of electrons
How many valence electrons do elements in column 15 (5A) have?
5 valence electrons
What is the name for SBr5?
Is an ice cube melting an endothermic or exothermic process?
endothermic
The density equation is D = m / V.
You perform water displacement with a 20.0 gram object, the water is originally at 10.0 mL and rises to 15.0 mL after placing the object in the cylinder.
What is the density of the object? (sig figs & unit required)
4.0 g / mL
What is the electron configuration for oxygen (O)?
1s22s22p4
The energy required to remove a valence electron is called ____________________________
Ionization energy
What is the formula for iron (IV) oxide?
FeO2
What process can you use to separate a solid from a liquid?
Filtration
You perform three trials of an experiment and you get the same measurement each time. This is an indication of high ____________________.
precision
List two ions that are isoelectronic with argon (Ar).
P-3, S-2, Cl-1, K+1, Ca+2
Why do noble gases not have electronegativity values?
They do not typically form bonds with other elements
What is the structure of an ionic compound called?
Crystal lattice structure