Physical and Chemical Changes - Page 7
Questions
- If a box of crayons is left in a hot car on a summer afternoon, what change would you expect to observe in the crayons?
- Is the freezing of mercury a reversible or irreversible physical change?
- How do we differentiate #"chemical change"# from #"physical change"#?
- Is color change evidence that a chemical or physical change may have occurred?
- If I hold a 5-cm piece of copper wire over heat until it glows red/then allow the wire to cool/inspect it once again. Then would I classify it as a physical change or chemical change???
- Does the mass of copper change when heated?
- Which of the following are physical changes and which are chemical changes? Rotting Food Fermenting Charcoal Burns in a Grill Decaying Plant Cutting Vegetables Melting Butter
- Why is boiling water an example of a physical change but iron turning into rust is a chemical change?
- Why is sublimation of iodine an example of physical change?
- Does a physical change involve a change in the chemical makeup of a substance?
- Is the dissolution of sodium chloride in water a physical or chemical change?
- What physical or chemical changes occur in a flame?
- Why the total mass of reactants and of product not change in a chemical reaction?
- Is the burning of paper a physical change?
- Is mixing oil and water a chemical change?