GCSE chemistry C1

questions from C1 chemistry OCR GCSE Answers are quite specific

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Last updated: December 11, 2022

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Hint	Answer
What are the three states in the particle model?	Solid liquid gas
Physical changes are...	reversible
What element has the smallest atoms?	Helium
What are the forces between particles?	electrostatic
In which state are these forces the weakest?	Gas
What 3 things does the particle model not take into account?	Forces, size, or spaces between particles
What is is called when something is made from two or more atoms joined together?	molecule
What attractive forces are these joined together by?	chemical bonds
What is the nucleus surrounded by?	electrons
How are these^ arranged?	in shells
what is the relative mass of an electron?	0.0005
What is a bond length?	the distance between the centres of two joined atoms
How do you calculate the mass number?	Number of protons + number of neutrons
What can you calculate using the mass number and the atomic number?	Number of neutrons
What do you call atoms with the same number of protons and electrons but different numbers of neutrons?	Isotopes

Hint	Answer
What do you call charged particles?	Ions
How do you form ions?	losing or gaining electrons
Who suggested all matter is made from atoms?	Dalton
When was this^?	1803
What 2 things did he^ also suggest?	all atoms of an element are identical and different elements contain different types of atom
Who discovered the first subatomic particle in 1897?	Thomson
What did he^ also discover about the structure and charge or atoms?	That they had electrons and were neutral overall
What model did he^ use to show this?	The plum pudding model
Who pointed beams of alpha particles at thin gold foil in 1909?	Rutherford
What did he^ find out about the nucleus?	it was positively charged
Where did he^ find most of the mass was?	the nucleus
What did he^ also suggest the electrons did?	orbit the nucleus
Who did Bohr disprove?	Rutherford
How did he^ say the electrons were arranged instead?	in shells
When was this^?	1913

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