Hard to get back the original chemicals.
might be....., a colour change, heat or light given out, a gas produced, a new smell
Can easily ge tback the original substance e.g. cool the water down to get back the ice.
Add marble chips and hydrochloric acid together to make it., Turns limewater milky., Heavier than air., Doesn't let things burn so good for putting out fires., Made during respiration and also during burning.
Add hydrochloric acid and magnesium together to make it., Puts a flame out with a pop, lighter than air
Relights a glowing taper.
Needed for respiration.
Litmus goes red in acids and blue in bases and won't change colour if something is neutral.
pH is a scale of how acidic or basic something is, The scale goes from 1 to 14. 7 is neutral e.g. water, above 7 is basic and below 7 is acidic., Universal indicator has a whole range of colours that help tell is the pH.
HCl is the acid in the stomach.
Car batteries have sulfuric acid in them.
Some cleaners have ammonia in them and they are bases.