C5 Chemical Changes Flashcards
What is the reactivity series
A list of metals in order of their reactivity
Most reactive at the top eg potassium (K)
Least reactive at the bottom eg platinum (Pt)
Atoms can be made and destroyed in chemical reactions? T or F
False
Burning Is a chemical reaction T or F
True
Melting and dissolving are chemical reactions T or F
False
Cooking food causes it to undergo chemical reactions T or F
True
Hydrogen gas reacts with oxygen gas to make water T or F
True
The total number of atoms in reactants is always the same as totals number of atoms in the products T or F
True
What is the order of reactivity with water and dilute acid
Potassium Sodium Lithium Calcium Magnesium Aluminium Zinc Iron Tin Lead Copper Mercury Silver gold Platinum
How do potassium, sodium, lithium, calcium react with water
Fizz, giving off hydrogen gas leaving alkaline solution of metal hydroxide
How do magnesium aluminium zinc and iron combine with water
Very slow reaction
Magnesium takes several days to collect enough gas to test with a lighted splint making a pop of hydrogen gas
How do tin and lead react with water
Slight reaction but only with steam
How do copper silver and go,d react with water
No reaction even with steam
How do potassium sodium lithium and calcium react with dilute acid
Explode
How do calcium magnesium aluminium zinc and iron react with dilute acid
Fizz
Give off hydrogen gas
Form a salt
How do tin and lead react with dilute acid
React slowly with warm acid
