Additional Science Chemistry C4 Revision Summary - OCR 21st Century


Flashcards on Additional Science Chemistry C4 Revision Summary - OCR 21st Century, created by mariannakeating on 06/08/2015.
Flashcards by mariannakeating, updated more than 1 year ago
Created by mariannakeating over 7 years ago

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Question Answer
What does the nucleus of an atom contain? Protons and Neutrons
What is the relative mass and charge of a neutron? Relative mass: 1 Charge: 0
Write the state symbols for each physical state Solid - s Gas - g Liquid - l Dissolved in water - aq
Describe how heating a metal can help identify it By heating up a metal can help identify it as Lithium (Li) turns into a red flame, Sodium (Na) turns into a yellow/orange flame and finally Potassium turns into a lilac/purple flame
Why does each element produce a different line spectrum? Each element produces a different line spectrum as different elements emits different wavelengths of light, which is due to each element having different electron arrangements. This means that each element has different pattern of wavelengths as well as different line spectrum
What can line spectrums be used for? Line spectrums can be used to discover new elements, for example caesium and rubidium were both discovered by their line spectrum
What size did Dobereiner organise the elements into? What were these groups called? They were organised into 3 elements and they were called 'triads'
Give two reasons why Newlands' Octaves were criticised His groups contained elements that didn't have similar properties, he also mixed up metals and non-metals e.g. oxygen and iron
Why did Mendeleev leave gaps in his Table of Elements? Mendeleev left gaps in his Table of Elements for undiscovered elements
What feature of atoms determines the order of the periodic table? The elements are laid out in order of increasing proton number
What is significant about the properties of elements in the same group? In each group they all have the same amount of electrons on the outer shell, for example all of the elements in Group 1 all have 1 electron on the outer shell
What are the rows in the periodic table known as? Rows are also known as periods
How many electrons can the first shell of any atom hold? 2
What is Ionic Bonding? Ionic bonding is when atoms lose or gain electrons they form charged particles called ions
What kind of structures do ionic compounds form? Ionic compounds form a regular lattice
Which group are the alkali metals? Group 1
As you go down the group of alkali metals, do they become more or less reactive? They become more reactive as you go down
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