Unit 1
All matter consists of particles called
Atoms!
True or False?
Covalent bonds typically have a very high melting point.
FALSE
A ____________ is a pure substance containing two or more elements that are ___________ combined.
A compound is a pure substance containing two or more elements that are chemically combined.
The molar mass of O2 is 32 gram per mole. How many moles are there in 10 grams of oxygen?
0.3125 moles
Which 2 elements are exceptions to the octet rule?
Hydrogen and Helium
What is the name of this polyatomic ion?: NH4+
Is SO4 polar or non-polar? Explain!
Nonpolar. There is an equal share of electrons, equal distribution or charge and the same element surrounding the central element.
What is the type of chemical reaction represented?
2 NaBr + 1 Ca(OH)2 → 1CaBr2 + 2NaOH
Double Replacement
Calculate the number of moles in 42 grams of NaHCO3
0.5 moles
The element Cerium (Ce) has an atomic number of 58. How many orbitals and valence electrons does Ce have?
6 orbitals
4 valence electrons
Polar or Non-polar:
BaCl2
Non-Polar
In Cobalt(II) Oxide (CoO), the charge of the cobalt is what?
2-
Calculate the molar mass of Ca(NO3)2. Round answer to the nearest hundredths place.
164.09 g/mol
Calculate the number of moles of zinc in 23.3g
.
0.36 moles
For the Chlorine atom, calculate the following:
-protons, neutrons, electrons, valence electrons, mass
Protons=17
Neutrons=18
Mass= 35
Valence Electrons= 7
Electrons= 17
Which element on the periodic table has the highest ionization energy?
Helium
Write the chemical formula for Sodium Sulfate
Na2SO4
Below is the chemical equation for rust. Use this equation to answer the following question.
4Fe + 3O2 → 2Fe2O3
How many moles of Fe will react with 3 moles of O2?
4 moles of Fe
Write the chemical formula for potassium carbonate
K2CO3
XH2 + O2 → 2H2O. Find 'X'.
X= 2
Explain in terms of stability, why Fluorine has the highest electronegativity.
Since Fluorine is so close to ideal electron configuration, the electrons are held very tightly to the nucleus.
Is NaCl an ionic compound or covalent compound? Explain
Ionic bond. Sodium is a metal and chlorine is a nonmetal. The sodium will transfer its valence electron to chlorine to make the compound stable.
Below is the chemical equation for rust. Use this equation to answer the following question.
4Fe + 3O2 → 2Fe2O3
You collect 0.36 moles of rust from your bike. How many moles of iron did it take to form that amount of rust?
0.72 moles of Fe
What are the number of moles of Hydrogen in 158 grams of Ammonium Bicarbonate?
10 moles
4Al + 3O2 → XAl2O3. Find 'X'.
X= 2