• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3

# Determination of a metal

Extracts from this document...

Introduction

Name: Sarah Barendswaard Abubakr                                                Date: 20/10/08

Teacher:  Mr. Briffa                                                                   Subject: Physics

Determination of a metal

Introduction

In class we were given an instruction sheet where the aim and apparatus where given, from that we had to think of an experiment, obtain results and process them.

Aim

The aim of this experiment is to determine the material of a couple of objects.

Apparatus

The following where used for this experiment

• Electronic balance
• Vernier callipers
• 6 different objects that appear to be of the same material but different masses and volumes

Diagram

Method

The experiment was done through the following steps:

• The object ‘x’ was weighed on an electronic balance
• The diameter and height of the object was measure if the object is a cylinder and the length width and height of the object was measured if the object is rectangular.
• The lengths where measured with a Vernier callipers

Middle

A

45.02

5.38 +-0.05

8.4 +-0.1

B

22.58

2.70 +-0.03

8.4 +-0.2

C

11.45

1.37 +-0.03

8.4 +-0.3

D

22.60

2.70 +-0.04

8.4 +-0.2

E

67.98

8.00 +-0.1

8.5 +-0.2

F

107.20

13.9 +-0.2

7.7 +-0.2

The relationship between Mass and Volume is proportional as we can see from the formula stated below:

D = M/V

Where D is the density

M is the mass

V is the volume

We can rearrange the formula to enable us to draw a direct proportionality graph like this

M = DV

y = mx

where Mass is on the y axes and volume on the x axes and the gradient would be the density.

The gradient on graph 1 is 8.4, this means that the density of the material is 8.4gcm-3.

In this graph there are two outliers; object E and F.

Conclusion

Evaluation

From this experiment I can evaluate the following

• The volume of object E was not measured accurately which could clearly be seen on the graph
• The density alone does not give us a certain answer to identifying the metal since a couple of metals have the same density as brass.
• The volume of the objects measured could have been measured with a higher precision

To improve these weaknesses we could

• Measure the volume of the hook on object E using a string for the height and a Vernier callipers for the diameter
• Measure the melting point of the metal which will give us a more certain answer to which metal the objects are.
• Measure the dimensions of the object with a screw gauge which has a much lower uncertainty, this will obtain more precise results

This student written piece of work is one of many that can be found in our International Baccalaureate Physics section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related International Baccalaureate Physics essays

1. ## Energy density experiment - Aim: To determine the energy density of ethanol

Average energy of ethanol transferred (J) Uncertainty of average energy transferred (J) 0.0005 7147.54 �1200 0.001 14016.84 �1500 0.0015 22446.14 �980 0.002 27783.23 �2500 0.0025 38818.73 �500 Graphing: Graph 1. Average slope of energy transferred to the water vs. amount of ethanol burnt By plotting a graph of energy transferred vs.

2. ## RESISTIVITY OF A MATERIAL

Record the current and potential difference across the wire. 6. Record the values for current and voltage in the table. 7. Repeat step number 4 and 6 until finish with all wires. Data processing and conduction: Form the formula I=, we can know R=, so when we calculate the

1. ## In this extended essay, I will be investigating projectile motion via studying the movement ...

It is difficult to measure the compressed spring length using the whole cylinder and hence the cylidrical container is cut into half with the base remains entired. (See Diagram 2)However, the measuring error of the projection range using this method is large due to the uncertainty of the position of the centre of the crater.

2. ## Energy Density of Ethanol

The uncertainty of gained data is �0.7MJ/kg. As the theoretical value is 26.8MJ/kg, it does not lie in between the uncertainty range. This is because of random error carried out throughout the whole experiment. As there are heat loss during the process of heating the water, there are a lot

1. ## Movement - modelling the height jumped by horses in the Olympics

Results/Calculations: Velocity2 (m/s) Height (cm) 1.96 3.9 1.8 3.2 1.65 2.7 1.5 2.2 1.2 1.5 1.06 1.1 0.6 0.36 0.5 0.3 The curve type I will choose to prove that the height is proportional to velocity squared is y = ax + b.

2. ## Unknown Metal Lab

c: is the specific heat. Units: J/(kg*K) Q: is the heat. Units: J (change)T: is the Change in temperature.

1. ## HL Physics Revision Notes

Velocity=displacement / time, and since there is no displacement, the wave has no velocity. As well, we say that no energy is propagated Nodes are points that are always at rest Antinodes are the places where maximum movement takes place Formation of standing waves: When two waves of the same

2. ## Measuring the density of cubes of Aluminium and Brass

Aluminium: 58.6g ± 0.05g Brass: 53.7g ± 0.05g Density: Using density function: p= mass/volume Since both the volume from measuring the sides of the cube and the volume calculated from the displacement, we can use the same equation. Percentage uncertainty for Aluminium = 25%+8.53x10^-4=25.0008% Aluminium: density= 58.6/ 8 = 7.2500±25.0008%=

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to