History of Chemistry
Who told the elements where to go?
Mendeleev
True or False: Ionic solids are conductive in liquids and solutions
True
What is an atom mostly composed of?
empty space
What are the 4 phases of matter?
solid, liquid, gas plasma
What is the mole ratio that properly balances the following equation:
H + Cl → HCl
1:1:1
J.J. Thomson used what piece of equipment to discover electrons?
Cathode Ray Tube
What is the only gas law that has inverse properties?
Boyle's Law
What is the most abundant element in the universe?
hydrogen
Metal reacts with oxygen and water producing this substance
rust
What is the mole ratio that properly balances the following equation:
O2 → O3
3:2
Name one element that Marie Curie discovered when researching pitchblende.
radium or polonium
At what temperature is there no particle movement?
absolute zero
Diamond and graphite are composed of which element(s)?
Dry ice turning into a gas in warm water is known as what?
sublimation
What is the mole ratio that properly balances the following equation:
H2 + O2 → H2O
2:1:2
Who discovered alpha radiation and beta radiation?
Ernest Rutherford
What is it called for the amount of energy needed to change a liquid to a gas?
heat of vaporization
What elements are liquid at room temperature?
bromine and mercury
True or False: Covalent bonds are stronger than ionic bonds.
true
What is the mole ratio that properly balances the following equation:
C3H8 + O2 → CO2 + H2O
1:5:3:4
Name 3 different models of the atom proposed in history.
any combo of: nuclear model, solid sphere model, proton model, plum pudding (thomson’s) model, solar system model, quantum cloud model
What is the state of matter found in our sun?
plasma
What are protons and neutrons made of?
quarks
This occurs when silver reacts with sulfur in the air, producing a grayish-brown film.
tarnish
Balance the following redox reaction with respect to number of electrons:
PbO + NH3 → N2 + H2O + Pb
3PbO +2NH3 → N2 + 3H2O + 3Pb