| A | B |
|---|
| How many sig figs in 1.00? | 3 |
| How many sig figs in 10? | 1 |
| How many sig figs in 0.010? | 2 |
| How many sig figs in 0.00001? | 1 |
| What is the standard unit of measurment for length? | meter |
| What is the standard unit of measurment for time? | second |
| What is the standard unit of measurement for mass? | kg (gram for conversions) |
| What are the prefixes used in this class and what do they measure? | kilo (1000) centi (1/100) milli (1/1,000) micro (1/1,000,000) |
| What is the standard unit of measurement for number of molecules? | mole |
| What is an "observation"? | An objective measurement. |
| What is an "inference"? | A judgement based on observation. |
| When solid ice (H2O) melts into water, is it a physical or chemical property? | Physical- (because the chemical stays the same) |
| When hydrogen and oxygen gas combust to form water, is it a physical or chemical property? | Chemical- (because new chemicals are made) |
| When iron forms rust in water, is it a physical or chemical property? | Chemical- (Rust is a different chemical than iron) |
| When table salt dissolves in water, is it a physical or chemical property? | Physical- (the salt can be recovered unchanged) |
| Each element has at least two different masses found in nature. These variations are called what? | Isotopes |
| An atom gains two electrons. What is the charge on the atom? | -2 (two extra negative charges) |
| The atomic number of an atom equals the number of what in the nucleus? | Protons |
| The atomic mass equals the number of what in the nucleus? | Protons and Neutrons |
| A charged atom that has given or taken electrons is called a what? | Ion |
| What is meant in the periodic table when an element has a clear or green symbol? | The element is not found in nature. |
