Chemical Equations
Is the equation an ionic bond or covalent bond
H2O
Covalent
Name the element with an atomic number of 10
Ne or Neon
What is the valency of ionic compound 'Ammonium'
1+
What is Dalton's Atomic Theory (name one of them)
all substances are made of atoms, all atoms of the same element are the same, atoms join together to make compounds
What is the most common element
Hydrogen
Identify the name of a material that will increate the rate of reaction
Catalyst
Name the element with an atomic number of 47
Ag or Silver
What is the valency of group 16
2-
Name the person who was first to theorize that matter is made from small particles that he called atoms
Democritus
What is the chemical composition of stomach acid or gastric acid
HCl
Identify whether or not the equation is endothermic or exothermic, balance, and include states.
Cl2 + H2 → HCl
Exothermic
Cl2(g) + H2(g) → 2HCl(aq)
Name a reactive non-metal in group 16
O, Oxygen, S, Sulfur, Se, or Selenium
What is covalency?
Covalency is the maximum number of covalent bonds an atom forms using empty orbitals. It depends on the number of valence electrons of an element.
Who discovered the electron and give a rough explanation of the experiment
JJ Thomson
Used a ray tube with a magnet and saw the beam bent away from the negatively charged metal plate and towards the positive charged plate
What is the covalency of xenon
6
Balance with states
C2H3Br + O2 → CO2 + H2O + HBr
2C2H3Br(g) + 5O2(g) → 4CO2(g) + 2H2O(g) + 2HBr(g)
Name an element that is a metalloid in group 14
Si, Silicon, Ge, or Germanium
Which block do elements not show variable valency?
s block elements
What is the most recent model of the atom, when was it devised, and who devised this model
The current model of the atom is the “quantum mechanical model” or the “electron cloud model”
Developed in the 1920s and early 1930s
Erwin Schrödinger and Werner Heisenberg
What is the 'Absolute Zero' temperature in Celsius, Fahrenheit, and Kelvin
Celsius: -273
Fahrenheit: -460
Kelvin: 0
Name the type (Combination, Decomposition, Double displacement, or Single displacement) of the chemical reaction, mention compound states for all, and balance
SeO2 + NaOH → Na2SeO3 +H2O
Double displacement
SeO2(s) + 2NaOH(aq) → Na2SeO3(aq) +H2O(l)
Name the element in group 6 and period 6
W or Tungsten
How many Selenium atoms are needed to make a homomonocyclic compound and what is the name (like the di in dioxide is used)
8
Cyclooctaselenium is an elemental selenium and a homomonocyclic compound.
What was the gold foil experiment, who conducted it, what happened, and what was the discovery made from it.
Rutherford and his students fired positively charged alpha particles at a thin sheet of gold foil.
Ernest Rutherford
Most of the alpha particles passed through the foil, but some were scattered backward or bent at large angles
The atom is mostly empty space with a small, dense, positively charged nucleus
What is the melting and boiling point of Au in Celsius (margin of error of +/- 10C allowed)
Melting: 1064C
Boiling: 2856C