Classify the following as being a physical or chemical change. I have to say if it is a chemical change or a physical change???? Evaporation is a physical change. Thus, the change is a chemical change. Chemical Change. Burning wood is a physical change. C 2. The girl scout bakes the bread: chemical change: Hydrogen joins oxygen to form hydrogen peroxide: chemical change (a new molecule is formed!) Wood rotting. Dairy product - Dairy product - Physical and biochemical properties: Milk contains many natural enzymes, and other enzymes are produced in milk as a result of bacterial growth. 1. blue color 2. density 3.solubility 4.length 5.milk sours 6.sour taste 7.luster,malleability, conducivity 8.melting point 9.acids can neutralize bases 10. Heat changes H 2 O to steam. Q. ... Energy changes always accompany chemical changes. Is milk going sour a physical or chemical change? A physical change can be undone if you put the milk back into a freezer and then melting it. Burning wood is a physical change. Physical . Grass growing in a lawn. Milk sours. Combining hydrogen and oxygen to make water is a physical change. Q. Enzyme action in milk systems is extremely important for its effect on the flavour and body of different milk products. physical change: The lunch lady grates cheddar cheese: physical change: The chef fries the eggs: chemical change (any cooking is!) 10. Problem: Which of the following is a physical change? 7. Ag (Silver) tarnishes. Physical Change. New substance. Combining hydrogen and oxygen to make water is a physical change. Food is digested in the stomach. Milk sours. SURVEY . Changing the size and shapes of pieces of wood would be a chemical change. 30 seconds . Ice melting. Sodium hydroxide dissolves in water. 1. C 11. Evaporation is a physical change. Both. P 4. 30 seconds . P 10. 4. 3. C 12. When ice cream melts, a chemical change occurs. Sugar dissolves in water. Evaporation Reason : It is because no new products are formed, therefore the change is a physical change. 6. 8. Part B. Sour milk has a chemical change. 9. Is freezing juice a physical or chemical change? PHYSICAL CHANGE CHEMICAL CHANGE. Milk sours when left out of the refrigerator B. answer choices . A. Wood rots. I would say that it is a change in ph sure it looks like a physical change but maybe that is a side-effect of the ph changing to a hight acidity level and if you think about it why would we call it milk has gone sour if the ph did not change from a base to slightly more acidic (sour things are acidic) Sand being washed out to sea from the beach is a chemical change. 5. answer choices . Evaporation occurs when liquid water changes into a gas. NaCl (Table Salt) dissolves in water. Chemical. Wood is burned on a stove C. Tums (containing CaCO3) neutralize stomach acid D. Sugar burns when heated on a skillet E. Butane in a lighter evaporates P 3. C 9. If it us left out in warm rooms is what causes it to sour. 6. 4. Physical and Chemical Changes. In a physical change, the makeup of matter is changed. SURVEY . (j) Sublimation of ammonium chloride : It is a physical change. 2. 5. Pancakes cooking on a griddle. Breaking up concrete is a physical change. An apple is cut. The souring itself is a process caused by the breakage and formation of chemical bonds by bacteria, a chemical reaction that produces food for the bacteria, with the waste products being acidic. Enzymes are biological catalysts capable of producing chemical changes in organic substances. Sugar dissolves in water. Evidence of a physical change. answer choices . formation of a new product, which cannot be converted into milk. 7. Tags: Question 18 . (k) Skimming of milk : It is a physical change. Tags: Question 19 . Wood rotting. Water changes into a freezer and then melting it of wood would a! 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