Question

NGLES FOR ANY POLYGON-180 (N-2 IN- Name: Which of the follwing is used for chemical symbols today? d. numbers 44. С. letters 一 a· drawings b. icons 45. The chemical formula of a compo and does NOT indicate the ー identity of the elements in the compound a. b. how elements are joined in the compound c. the composition of the compound d. relative proportions of the elements in the compound 46. Which substance has a chemical symbol that is derived from a Latin name? c. oxygern d: potassium a. calcium b. hydrogen 47. In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water of the following is a reactant? e. water d. heat a. sucrose b. carbon dioxide 48. Which of the following is NOT a physical change? a. grating cheese fermenting of cheese e, mixing two cheeses in a bowl b. melting cheese All of the following changes to a metal are physical changes EXCEPT d. 49. ー _ a. bending b. melting which of the following does NOT involve a physical change? c. rusting d. polishing $0. _ a. mixing b. melting c. grinding d. decomposing 51. Wh ich of the following processes does NOT involve a change in chemical properties? a _ rusting b. fermenting A chemical change occurs when a piece of wood a. c. boiling d. burning 52. is split įs painted c. decays d. is cut b. Which of the following is a chemical property of water at 4°C? 53. a. İts color b. its state c. its temperature d. its ability to decompose into hydrogen and oxygen When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place? a. 54. a physical change a chemical change b. c. neither a physical change nor a chemical change both a physical change and a chemical change Which of the following indicates that a chemical change has happened during cooking? a. The food darkens. b. Bubbles form in boiling water. c. Butter melts. d. Energy is transferred from the stove to a pan. d. 55.