Answer:
physical change because even though gas formation was observed the water was undergoing a state change which means that it's original properties are preserved
1 significant figure, because there is no decimal after the zero the zero doesn't count.
Answer:
Antacid Neutralises the acid in the stomach.
Explanation:
Antacid contains ingredients such as aluminum, calcium, magnesium and sodium bicarbonate which act as bases. These help neutralise the pH levels in the stomach and makes the contents of the stomach less corrosive.
The density is one gram per mL, so 1.
Examples include carbonated water (i.e. soda water); honey; sugar syrup (used in confectionery); supersaturated drug delivery systems. "SDDS"; and sodium acetate solutions prepared from 160 g NaOAc and 30 mL water.