# Yhgdyehgeyugfih

Páginas: 4 (943 palabras) Publicado: 12 de septiembre de 2012
OXFORD SCHOOL OF ENGLISH
CHEMISTRY

LAB PRACTICE 3 pg 18

OBTAINING DENSITY OF SOLIDS AND LIQUIDS

TEAM MEMBERS: 10 B2

- María José Ramonet
- Ximena Ruiz
- Laura Malo
- PrisillaCarrillo
Friday November 18th 2011

OBTAINING DENSITY OF SOLIDS AND LIQUIDS
INTRODUCTION:
Density is physical property of matter that indicates the relationship between mass and volume of an specificsubstance or material: mass is expressed in grams and volume using cubic centimeters. millimeters, or liters. This property can be used along with other characteristics properties to describe amaterial and it can be calculated experimentally by measuring the mass and the volume of a sample.
You can also fine tables with the density of the most common elements and materials.
Once the mass andthe volume of a substance are measured, we can place them in a relationship called the density expression:
Density= mass / volume or p= m/v
PROBLEM:
Using only a graduated cylinder and a balance.Can you distinguish which of the following materials has the higher density?

- iron
- Aluminum
- copper
- water
- kitchen oil
- glycerol

PRELAB:
Search and compare thefollowing:
1. Density and relative density.
Density: is a physical property of matter, as each element and compound has a unique density associated with it. Density defined in a qualitative manneras the measure of the relative "heaviness" of objects with a constant volume.
Relative density: is the ratio of the density (mass of a unit volume) of a substance to the density of a given referencematerial. Specific gravity usually means relative density with respect to water.
2. To iron, aluminum and copper: symbol, boiling point, melting point and density.

-IRON:
symbol: Fe
boilingpoint: 2750ºC
melting point: 1535ºC
density: 7878 kg/m3

-ALUMINUM:
symbol: Al
boiling point: 2467ºC
melting point: 660.37ºC
density: 2.70 g/mL

-COPPER:
symbol: Cu
boiling point: 2567ºC...

Regístrate para leer el documento completo.