chemistry - kips practice Flashcards
the mass of one mole of electrons is
0.55 mg
which pair of mixture is called ideal solution
water – ether
what can affect the magnitude of equilibrium constant Kp, of a reversible gaseous reaction?
temperature
what is an ether?
class of compounds that contain an ether group—an oxygen atom connected to two alkyl or aryl groups
general formula: R–O–R’
- easily flammable liquid used to dissolve other substances such as oils, fats, etc.
catalysis
acceleration of chemical reaction by catalyst
contact process
catalytic method for producing sulfuric acid (H2SO4) from sulfur dioxide (SO2) and oxygen (O2)
- heterogeneous catalysis
- homogenous catalysis
- autocatalysis
- enzyme catalysis
- heterogeneous catalysis: catalysis where the phase of catalysts differs from that of the reactants or products
- homogeneous catalysis: catalysis where the phase of catalysts is the same as that of the reactants or products
- autocatalysis: one of the reaction products is also a catalyst for the same reaction
- enzyme catalysis: increase in the rate of a process by a biological molecule (enzyme)
a safe and more reliable method for drying the crystal is through
vacuum desiccator
pseudo solid + examples
solid that possesses properties of a liquid
examples: glass and pitch (resin)
the order of reactivity of halogens with alkane is
F2 > Cl2 > Br2 > I2
x-ray diffraction
determines atomic radius and molecular structure of a crystal
optical microscope & electron microscope
optical - magnified image of an object specimen
electron - uses electron beams as a source of illumination, has higher resolution (see more smaller things)
spectrophotometer
measures absorbance of light
stronger the oxidizing agent, greater the _____________
reduction potential
which of the following can be used in laptops
nickel cadmium cell
nickel cadmium cell
type of rechargeable battery used in aviation, rail and mass transit, backup power for power lines, etc.
lead accumulator
secondary cell b/c electrical energy is not generated within it but stored from an external source
silver oxide battery
primary cell battery used in watches, calculators, hearing aids, etc.
primary vs. secondary battery
primary is not rechargeable, secondary is
fuel cell
an electrochemical cell that converts the chemical energy of a fuel (often hydrogen) and an oxidizing agent (often oxygen) into electricity through a pair of redox reactions
- do not run down or need charging, produce heat or electricity as long as fuel is present
used in transportation (cars), industrial stuff
Van Der Waal’s equation
- a more accurate representation of properties of non-ideal gases because factors in attraction b/w molecules and volume of molecules
PV = RT/(V - b) - a/V^2
a real gas obeying van der waal’s equation will resemble ideal gas if ‘a’ and ‘b’ are ______________
small
plasma + what used in
superheated matter – so hot that the electrons are ripped away from the atoms forming an ionized gas
- comprises 99% of the universe
- glows
used in: fluorescent bulb, neon sign, lasers
- ionic crystal
- metallic crystal
- covalent crystal
- molecular crystal
ionic crystal: composed of alternating positive and negative ions
metallic crystal: metal cations surrounded by a “sea” of mobile valence electrons
covalent crystal: composed of atoms covalently (shared electrons) bonded to one another
molecular crystal: held together by weak intermolecular forces
