Isotopes and Ions
Elements with the same number of protons but different number of neutrons
Isotope
With significant figures: 8.75 g + 56.2 g - 9.0 g
56.0 g
What are three major types of chemical bonds
ionic, covalent, metallic
The sum of protons and neutrons in the nucleus of an atom is known as the _________
Mass number
What is the name of KF?
Potassium Fluoride
How are ions formed?
By losing or gaining valence electrons
with significant figures and units
12.2 cm x 5.0 cm x 452.3 cm
28,000 cm^3
A substance is observed to have a low melting point and is not conductive in its solid form. We can assume this substance contains what type of bond?
Covalent
How many electrons are in the 3rd energy level?
18
What is the formula for Calcium Chloride
CaCl2
Elements in Group 2A form ions with a charge of ___
+ 2
What is the molar mass of NaCl?
~58g/mol
What bond will form between barium and sulfur?
Ionic
State the electron configuration of Ca
1s2 2s2 2p6 3s2 3p6 4s2
What is the name of P2O5
Diphosphorus pentoxide
The Oxide ion has _____e-
10 e-
1 mole of Li has a mass of 7 grams. How many moles are in 21 grams?
3 moles
What type of bond involves two non-metals?
covalent
As you move right within a period, which periodic trend decreases and why?
Atomic radius; increased protons
What is the formula for Dichlorine octoxide?
Cl2O8
C-14 has how many neutrons?
8
A strange cubic object has a density of 120.5 g/mL
It's height is 3.00 cm, width 4.00 cm, and depth 5.00 cm
What is the mass in kg? sig figs needed
daily double!
7.23 kg
This bond occurs when electrons are transferred. State the bond type and 2 additional facts about these types of bonds
ionic; conducts in water, high melting point, crystal lattices, difficult to crush, etc.
What is the main explanation for periodic trends as they change within a group?
Different numbers of electron shells/electron distance from nucleus
What is the name of CuSO4
daily double!
Copper (II) Sulfate
protons = 16
neutrons = 15
electrons = 18
state the element, mass, and charge
Sulfur/sulfide; mass 31; charge 2-
A student measures the mass of an object as 42 g
It's volume is 15 mL
The accepted density for the object is 3.0 g/mL
What is the % error of the measurements
6.7%
What part of the atom is involved in chemical bonds (be specific)
valence electrons
What is the trend that describes the energy released when an electron is gained and in what directions does it increase?
electron affinity, up and right
What is the formula for Tin (IV) sulfide?
SnS2
Iron-56
charge is 4+
protons, neutrons, electrons?
p = 26
n = 30
e = 22
What is the percent composition of H2O?
%-H = 11.11%
%-O = 88.89%
Why do metals and nonmetals form ionic bonds?
Difference in electronegativity values is high
1s2 2s2 2p6
charge is 1-
(consider nomenclature in your answer)
Fluoride
What is the formula for Calcium Silicate (silicate is SiO4 4-)
Ca2SiO4