Quiz 2

Question 1

What is the law of conservation of mass?

Answer 1

In a chemical reaction mass is neither created or destroyed

Question 2

What is the law of definite properties?

Answer 2

All samples of a compound have the same proportion of given elements

Question 3

What is the law of multiple proportions?

Answer 3

• Two or more compounds
• Two elements (A+B) form 2 different compounds
• Masses of element B that combine w/1g A can be expressed as a ratio of small whole numbers (whole atoms)

Question 4

Daltons Atomic Theory (1808)

Answer 4

• Each element- tiny indestructible particles - atoms
• All atoms of an element have the same mass + other properties
• Atoms form compounds by combining in simple whole number ratios
• Atoms of one element can change to another

Question 5

JJ Thomson

Answer 5

• Experimented with a cathode ray tube
• Applied a high electrical voltage between two electrodes and found that a beam of particles called cathode rays travelled from negative to positive
• Measured mass to change ratio of particles
• Discovered the electron within atoms

Question 6

Millikan’s Oil Drop Experiment

Answer 6

• Found the smallest unit of charge
• Charged oil droplets were suspended in an electric field
• Charge on the oil drop always multiple of -1.60x10^(-19)
• After the charge was deduced mass could be solved for