Physical and Chemical Changes - Page 3
Questions
- Is distillation a chemical or physical change?
- What is the chemical formula of sulphuric acid?
- What are the changes that occur inside a helium balloon as it rises from sea level?
- Is cutting hair a physical or chemical change?
- Can a chemical change alter the total number of atoms?
- Is removing salt from water by evaporation considered a physical or chemical change?
- In an experiment, a colour change is observed, and also observed is prolonged bubbling. Is this a chemical change?
- Is adding sugar to lemonade a physical or chemical change?
- Salt dissolves in water. Is this a chemical or physical change?
- What occurs when calcium chloride is reacted with sodium bisulfate?
- Is it correct to say that dissolving i a packet of juice powder in water makes a new substance, fruit punch, and so it must not be a physical change?
- What speeds up chemical changes?
- Is dissolution a chemical change?
- What are the five "clues" that a chemical change has occurred?
- What is an example of a chemical change?
- How can you increase the speed of a chemical change?
- #NH_4OH + HCl(aq) = NH_4Cl(aq) + H_2O(l)# no significant change can be noticed How to make sure that a reaction is really taking place ?
- When baking soda is added to vinegar, it reacts vigorously, causing some fizzing and gas evolution. If a lit match is brought near the reaction flask, it is extinguished. What two key information help you identify this as a chemical change?
- Is distillation a physical change?
- How can you tell that a hamburger is undergoing a chemical change when you cook it?