Lab 1 Density of Solids and Liquids

Questions and Answers

A cube of copper weighing 63.54 g and the same sized cube of gold weighing 63.5 g have different densities.

True

What is the actual density of pure water at 25 degrees Celsius?

1.0 g/mL

How can you tell if a liquid is more or less dense than water?

If the density is over 1.0 g/mL, the substance is more dense than water and will sink. If under 1.0 g/mL, it will float.

What is the objective of this lab?

To learn the proper use of the balance and to calculate the density of various materials using various methods. Signup and view all the answers

How is density defined?

Material's mass per unit of volume. Signup and view all the answers

What is water's density at 25 degrees Celsius and room temperature?

1.0 and 0.9970 Signup and view all the answers

How can mass and volume be found?

Balance (grams) and graduated cylinder. Signup and view all the answers

What are the steps to determine the mass of a metal slug?

Obtain metal slug, record number, determine mass in grams using the balance. Signup and view all the answers

How can you determine the density of a liquid?

Mass of 10 mL graduated cylinder in grams, record mass with the unknown liquid, determine exact volume, and find average density. Signup and view all the answers

What is the process for determining the density of a solid?

Determine mass with balance, measure water volume before and after adding the metal, find the volume of water displaced, and calculate density. Signup and view all the answers

What formula do you use to solve density problems?

D = m/v Signup and view all the answers

Study Notes

Density Overview

Different materials, like copper and gold, can have the same weight but differing densities.
The density of pure water at 25 degrees Celsius is 1.0 g/mL.

Density Comparison with Water

Substances with density greater than 1.0 g/mL sink in water.
Substances with density less than 1.0 g/mL float in water.

Experiment Objectives

Learn to properly use a balance scale.
Practice calculating the density of various materials through different methods.

Definition of Density

Density is the mass of a material divided by its volume.

Water Density Values

Water's density at 25 degrees Celsius is 1.0 g/mL.
Water's density at room temperature is approximately 0.9970 g/mL.

Measuring Mass and Volume

Mass is measured using a balance in grams.
Volume is measured using a graduated cylinder.

Measuring Metal Slug Mass

Use a balance to determine the mass of a metal slug after recording its identification number.

Liquid Density Determination

Measure the mass of a graduated cylinder when empty and when containing an unknown liquid.
Calculate the mass and volume of the liquid to find its density.

Solid Density Determination

Record the mass of the unknown metal using a tared weigh boat.
Measure the change in water volume after adding the metal to find the volume displaced and calculate density.

Density Calculation Formula

Density can be calculated using the formula: D = m/v (Density = mass/volume).

Description

Test your knowledge on the density of solids and liquids with these flashcards. This quiz covers the differences in density between substances and provides definitions essential for understanding this foundational concept in science.