Ch 1 2 3 Flashcards
1
Q
Accuracy vs precision
A
Accuracy: how close is the measured value to the actual value
Precision: how close together are the measurements
2
Q
Law of definite proportion and how to solve problems
A
A compound is always composed of the same elements in the same proportion of mass
- Find ratio by mass of 1st element to 2nd in both compounds
2: divide by smallest to see if law applies
3
Q
Law of multiple proportions ratio of ratios and how to solve
A
If elements form more than one compound, the mass % composition in both will have whole number ratio
- Find mass % of each element in each compound
- Find ratio of 1st % : 2nd % for each compound
- Divide both ratios by the smallest number to see if law applies
4
Q
Coulomb’s law
A
Energy of attraction/repulsion between two particles is…
- directly proportional to product of charges
- inversely proportionate to distance
