Unit 1- Combustion, Heat, & Energy
Define combustion.
A chemical reaction, usually forming heat or light using oxygen.
Write a Noble Gas configuration for Ca (Calcium).
[Ar] 1s^2
How many valence electrons does nitrogen have?
5
Define Octet Rule
Rule that states that atoms will form bonds until it has 8e- in the valence layer of each atom
What is the chemical formula for the compound lithium chloride
LiCl
What is an endothermic reaction? How does the temperature change?
Absorption of heat, object feels cold to the touch.
Orbitals are 3D, Orbits are 2D.
Name the second group on a periodic table.
Alkali earth metals
Contrast Cation and Anion
Cations are positively charged, Anions are negatively charged.
What type of compound uses prefixes?
Molecular/covalent
What are the 3 mechanisms of heat flow?
Convection, Conduction, Radiation.
Define Isotope.
Atoms that have the same #of protons but different #s of neutrons.
Create a lewis dot diagram for oxygen
..
. O .
..
Correct this statement:
Ionic bonds have a high melting point, are soluble in water, and do not conduct electricity
Ionic bonds conduct electricty
Write the chemical name for N2O4
Dinitrogen tetroxide
What state of matter has the highest energy level?
Gas.
What is the atomic emission spectra?
Name 3 elements in the metalloid line.
B, Si, Ge, As, Sb, Te, At
What does the difference of electronegativity between atoms have to be to make a polar covalent bond?
0.4 - 2.0
Write the name chemical of Fe2O3
Iron(III) oxide
What are the layers of the upper mantle? In which layer does convection occur?
Lithosphere, Asthenosphere.
Asthenosphere.
Contrast ground state and excited state of electrons.
Ground state is when an electron is in the lowest possible energy level, excited state is when it's at the highest.
What direction does electron affinity increase on the periodic table? (Same as Ionization energy)
Up, left to right
How many double bonds does hydrogen have w/ Fluorine?
0
Explain when parentheses are required when writing a chemical formula for an ionic compound.