# Chapter 2 Chemistry

### Notes & Vocabulary

## Notes

## Vocab

**Base Unit-**is a defined unit in a system of measurement that is based on an object or evet in the physical world.

**Second- **The base unit for time.

**Meter- **The base unit for length.

**Kilogram-** Base unit for mass.

**Derived Unit- **A unit that is defined by a combination of base units.

**Liter- **The metric unit for volume equal to one cubic decimeter.

**Density- **is a ratio that compares the mass of an object to its volume.

**Kelvin- **is the SI base unit for temperature.

**Scientific notation- **expresses numbers as a multiple of two factors: a number between 1 and 10; and ten raised to a power, or exponent.

**Conversion factor-** is a ratio of equivalent values used to express the same quantity in different units.

**Dimensional analysis- **is a method of problem-solving that focuses on the units used to describe matter.

**Accuracy- **refers to how close a measured value is to an accepted value.