Ch 1 2 3

Question 1

Accuracy vs precision

Answer 1

Accuracy: how close is the measured value to the actual value

Precision: how close together are the measurements

Question 2

Law of definite proportion and how to solve problems

Answer 2

A compound is always composed of the same elements in the same proportion of mass

1. Find ratio by mass of 1st element to 2nd in both compounds
   2: divide by smallest to see if law applies

Question 3

Law of multiple proportions ratio of ratios and how to solve

Answer 3

If elements form more than one compound, the mass % composition in both will have whole number ratio

1. Find mass % of each element in each compound
2. Find ratio of 1st % : 2nd % for each compound
3. Divide both ratios by the smallest number to see if law applies

Question 4

Coulomb’s law

Answer 4

Energy of attraction/repulsion between two particles is…
- directly proportional to product of charges
- inversely proportionate to distance