Yr8 Mod9 Investigating trends in the periodic table

Investigating Trends in the Periodic table

Brief:

Part 1:Investigate how melting temperature of elements changesas you increase the period number in group 1 of the periodic table.

Part 2:Use your results to form a hypothesis for the relationship between period number and melting temperatures of group VII then investigate your hypothesis.

Part 3: Use the result of this investigation to predict the melting temperature of element 117 Ununseptium.

Variables:

The Variables that will affect my investigation are:

  • Period the element is in.
  • Melting point of the element.
  • Group the elements is in.
  • Data source

My Independent variable will be: The Period the element is in.

My Dependent variable will be:The melting point of the element.

The Range of my independent variable will be Period 2 to 6

The Values of my independent variable will be; Period 2,3,4,5,6

My controlled variable will be; to use the same data source for finding the melting points of the elements.

Success Criteria:

To be successful I will need to:

Find an accurate and reliable data source for my research

So that I can:

Produce valid tables of melting temperatures.

To be successful I will need to:

Produce a valid table of melting temperatures for group I,

So that I can:

Plot an accurate graph of melting temperatures of group I to find the relationship between my independent and dependent variable.

To be successful I will need to:

Find detailed scientific evidence to explain the findings of my research,

So that I can:

Form a hypothesis about the relationship between period number and melting temperature of the elements in group VII.

To be successful I will need to:

Research the melting temperatures of group VII

So that I can:

Plot a graph of the melting temperatures of group VII

To be successful I will need to:

Extrapolate the graph of melting temperatures

So that I can:

estimate the melting temperature of Element 117.

Evidence

  • What is the difference between a group and a period in the periodic table?
  • Find a suitable data source for your research
  • Find out how big each of the atoms are in group 1.
  • Find out how many electrons group I atoms give to the ‘electron sea’ that sticks that atoms together.
  • Find out what causes elements in group 1 to change from a solid to a liquid state.

Method Part 1:

1/ Using a suitable data source that you have identified make a table of the melting points of the group 1 elements against the period it is in.

2/ Plot a scatter graph of the data.

3/ Try to identify a trend in the data.

Results Part 1:

Element / Period / Melting point oC
Li
Na
K
Rb
Cs
Fr

Graph:

  • Choose the correct type of graph to analyse your results.
  • Take care to make sure your scales are regular.
  • If you can draw a line of best fit.
  • Try to find the equation of the line

Conclusion

State what is the trend between period and melting temperature for group I ______

Using your evidence try to explain with as much scientific detail as you can why you think these trends exist. (Diagrams to model your ideas can be very useful)

Hypothesis Part 2:

Using your results from part 1 write a hypothesis about the melting temperatures of the group VII elements

______

Method Part 2:

1/ Using a suitable data source that you have identified make a table of the melting points of the group VII elements against the period it is in.

2/ Plot a scatter graph of the data.

3/ Try to identify a trend in the data

Results Part 2:

Element / Period / Melting point oC
F
Cl
Br
I
At

Conclusion Part 2

State what is the trend between period and melting temperature for group VII ______

Using your evidence try to explain with as much scientific detail as you can why you think these trends exist. (Diagrams to model your ideas can be very useful)

Hypothesis Part 3:

The discovery of ‘the last missing element’ Ununseptium 117 was announced on 5th April 2010. Extrapolate the graph of melting temperatures of group VII elements to predict the melting point of element 117.

If you can use the equation of the line of best fit to find the melting point of element 117.

Melting temperature of element 117 =

Explain how you predicted this value ______

ALN Sample graphs and extra information