Past paper corrections Flashcards
Why are instrumental methods used?
To produce more accurate results
What safety precaution should a student take with a bunsen burner?
Wear safety glasses
What two things happen when a metal and an acid react?
- Fizzing
- Metal dissolves
Compounds formed from only non-metals contain particles called what?
Molecules
Elements with similar properties are put in columns called?
Groups
What are nanoparticles?
Very small particles
Why did Mendeleev leave gaps in his periodic table?
To make patterns fit
Why should hydrogen not be in group/column 1?
It is a non-metal
Why was Newlands’ periodic table not accepted by other scientists? [3]
- In some places two elements were put together
- Groups contained elements with different properties
- Newlands was not well-known
State and explain how Mendeleev improved Newlands’ periodic table [2]
- Left gaps
- So elements fitted with the pattern of properties
Describe** and** explain how the reactivity changes as you go down group 1 [4]
- Reactivity increases as you go down group 1
- Outer electron is further from the nucleus
- Less attraction between outer electron and nucleus
- Outer electron is lost more easily
Explain how electricity is conducted in a metal [4]
- A metal is a giant lattice structure
- Contains positive ions
- With delocalised electrons
- These electrons can move and carry charge
Why can metals be shaped? [2]
- They are made of layers
- Which can slide over each other
Describe what happens when two atoms of potassium react with one atom of sulfur [5]
- Electrons are transferred from potassium to sulfur
- Two potassium atoms each lose one electron
- This forms K⁺ ions
- Sulfur atom gains two electrons
- This forms S²⁻ ions
What type of bonding do metals and non-metals do?
Ionic bonding (transferring)
