Physical and Chemical Changes - Page 2
Questions
- How does a chemical change affect the composition of matter?
- Is evaporation a physical change?
- Michael mixes two chemicals together in a beaker. The chemicals change color, and the beaker heats up quickly. What kind of change most likely occurred?
- Is hydrogen and oxygen gas combining to form #H_2O# a chemical or physical change?
- How might you tell whether or not your toothpaste contained calcium carbonate, #CaCO_3#, or perhaps baking soda, #NaHCO_3#, without looking at the ingredients label?
- What is changed when matter undergoes a physical change?
- Is sublimation a chemical change?
- Is the protonolysis reaction of sulfuric acid in aqueous solution an example of chemical change?
- Is milk souring a physical or chemical change?
- Why are physical changes generally reversible?
- What are the chemical changes of smores?
- Does freezing a substance change it?
- Why might a physical change require energy?
- Is corrosion a chemical or physical change?
- Are reactions with water to form a gas physical or chemical changes?
- A light green powder is heated in a test tube. A gas is given off, and the solid becomes black. Was the change physical or chemical, and is the green powder an element, a compound, or a mixture?
- Would the reaction between dihydrogen and sodium hydroxide to give sodium and water be considered a chemical change?
- What are 3 examples of a chemical change?
- What are examples of physical changes? Chemical changes?
- The mass of a beaker containing a sample of water at 20°C was 109.44 g. After heating the sample to 60°C, the combined mass of the beaker and water was 109.08 g. Do these results contradict the law of conservation of mass?