Classification of matter
what is the difference between a compound and a mixture?
Compounds are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances.
Chemical property
Is any of a material's properties that becomes evident during, or after, a chemical reaction
What is kinetic energy (chemistry)
is the energy of motion, observable as the movement of an object or subatomic particle.
difference between diffusion and effusion?
Diffusion occurs when gas molecules disperse throughout a container. Effusion occurs when a gas passes through an opening that is smaller than the mean free path of the particles.
Who was the ancient Greek philosopher that first proposed the concept of atoms?
Democritus
what method should be used to separate two liquids?
Distillation
Physical property
Is any property that is measurable, involved in the physical system, intensity on the object's state and behavior.
how do kinetic energy and temperature correlate?
When the temperature of an object increases, the average kinetic energy of its particles increases.
The rate of effusion of a gas is inversely proportional to the square root of its molar mass.
Grahams law
Which scientist proposed the law of conservation of mass?
Antoine Lavoisier
A geologist finds a material that she thinks may be gold. What test would reveal that the material is not gold and not an element?
Its density is different that of gold.
During which of the following processes will the chemical composition of a substance change?
Decomposition
List the states in decreasing order of kinetic energy.
Gas, liquid, solid
Standard pressure is equal to __________ kPa
101.3
Which scientist discovered electrons using the cathode ray tube experiment?
J.J. Thomson
A student is given a 250-gram sample of seawater. She is asked to determine the percentage of dissolved solids in the sample. Which should she do first?
Dissolve the liquid
Evaporating water produces gaseous water. What has occurred during this process?
A physical change has not resulted in a new substance.
what relationship is produced by the close packing of molecules in a solid
decreased compressibility
This law says that the volume and pressure of a gas are indirectly proportional to each other.
The scientist who formulated the plum pudding model of the atom was?
J.J. Thomson
Difference between a colloid and suspension?
Unlike those in a suspension, particles in a colloid do not separate when sitting still. The particles in a suspension may be separated by filtration unlike those in a colloid.
During which of the following processes will the chemical composition of a substance remain unchanged?
Sublimation
pressure, volume, number of particles (chemists group them by moles) and temperature.
Under the same temperature, pressure and volume all gasses contain the same number of molecules (but not the same mass). What law?
Ideal gas law
The atomic theory states atoms are?
Composed of protons, neutrons and electrons.