Bonding
This is the type of bonding where one or more pairs of electrons is shared between atoms.
Covalent bonding
True/False: After a chemical reaction, the products are the same compounds as the reactants.
False! The atoms are the same, but they rearrange to form new compounds.
a negatively charged subatomic particle
an electron
107.87 g/mol
Write the formula for Lithium Bromide (Br).
LiBr
When calcium (Ca) is bonding with another atom, does it want to gain or lose electrons?
Lose. (Ca has 2 valence electrons, so to get to 8 electrons it is easier to lose 2 than to gain 8)
True or False: Oxygen is always a reactant in combustion reactions
True
Unit of measurement that shows how much of a substance you have
What is the molecular mass of Bohrium? (Bh)
264 g/mol
Write the chemical formula for Sodium Chloride.
NaCl
Which leads to a more stable state, bonds being broken or bonds being formed?
Bonds being formed
A type of reaction where energy is absorbed
endothermic reaction
A salt dissolved in water that can conduct electricity.
An electrolyte.
What is the molecular mass of water? (H2O)
18.02 g/mol
Write the Chemical Formula for Magnesium (Mg) Sulfide.
MgS
Why are water molecules so attracted to each other? (Think about what kind of bond it is)
Polar covalent bonds mean that water has a slightly positive end (H) and a slightly negative end (O) so there is an attraction between water molecules.
If there is more energy released from bonds being formed than energy required to break bonds, what kind of reaction is taking place?
An exothermic reaction
An electron on the outer energy shell of an atom
valence electron
What is the molecular mass of octane? (C8H18)
114.26 g/mol
Write the chemical formula for Beryllium (Be) Nitride.
Be3N2
Explain the relationship between bond length and bond energy.
Bond energy increases as bond length decreases. The larger the atom or larger the bond, the farther the nuclei of the atoms are from the other atom's electrons. That causes the bond energy to be lower.
Explain why hydrogen fuel produces more energy per gram than octane, even though octane produces more energy per mole.
1 gram of hydrogen is about 1 mole of hydrogen, but 1 gram of octane is about .0088 mole of octane. There are more bonds being broken and formed in the combustion per gram of hydrogen than octane, even though 1 mole of octane contains more bonds than 1 mole of hydrogen.
What are the 6 elements necessary for life on Earth?
Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Sulfur (CHONPS)
What is the molecular mass of table salt?
58.44 g/mol
Write the chemical formula for Hydrogen Phopshide.
PH3 (H3P)