Newlands table was disregarded by other scientist because after Calcium the properties did not match very well?
Mendeleev's table is what the modern Periodic Table is based on?
When did scientists discover Protons and Electrons?
Beginning of the 18th Century
End of the 18th Century
Beginning of the 19th Century
End of the 19th Century
Beginning of the 20th Century
End of the 20th Century
Which group is unreactive?
When you go down the groups of elements what happens to the level of attraction?
It gets stronger
It stays the same
it gets weaker
What are Group 1 Elements called?
What bonds do Alkali Metals form?
Transition metals are found between groups 2&3?
Select the correct statements about transition metals:
They all have higher melting and boiling points than the alkali metals
They all have higher melting and boiling points than the alkali metals, except for Mecury
They all have higher melting and boiling points than the alkali metals, except for Chronium
They conduct heat and electricity well
They don't conduct heat and electricity at all
Most are used as alloys
They react slowly or not at all
They don't react
They form positive ions
They form negative ions
Group 7 are know as Halogens?
Halogens are non-metallic
Halogens have :
Low boiling point and a high melting point
Low boiling point and a low melting point
High boiling point and a high melting point
High boiling point and a low melting point
A more reactive halogen will displace a less reactive one?
Contains Magnesium and Calcium ions
The benefits of Hard Water are:
The calcium is good for our bones and teeth
Reduces the risk of heart disease
Increases chance of cancer
How do we remove Hard Water?
Ion Exchange column
Add washing soda
A modern water filter uses Carbon as its main material?
Using Washing Soda to soften water means that your precipitate out all calcium and magnesium ions along with any other insoluble carbonates.