Answer: B. a chemical change
Explanation:
Answer:
you can see the answer at the pic
The human body contains many salts, of which sodium chloride NaCl is the major one, making up around 0.4 per cent of the body's weight. So a 50kg person would contain around 200g of sodium chloride - around 40 teaspoons. Since we lose salt whenever we sweat, it has to be continually replaced.
Answer: 0.4% of body weight.
//Not sure, but hope it helps.
Property:
-Reactivity
Alkali metals:
-very reactive
Transition metals:
-less reactive
Property:
-Density
Alkali metals:
-Can float on water
Transition metals:
-sink in water
Property:
-melting and boiling point:
Alkali metals:
-Low
Transition metals:
-high
Property:
-colour of salts
Alkali metals:
-Colourless
Transition metals:
-often coloured
I’m pretty sure it’s sulphur dioxide