Pt.3 Chemistry Ch1 Quest

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18. was talking about baking soda and other Ingredients and what they are considered. in answer 18. speaks (B)Baking Powder is a physical blend of pure substances, making it a mixture.. 19. Which of the following is a physical property of sugar? (A) It decomposes readily. (B)Its composition is carbon, hydrogen, and oxygen (C) It turns black with concentrated H2SO4. (D) It can be decomposed with heat. (E) It is a white, crystalline solid. ans. 19. (E) Physical properties deal with only the substances itself, not how it reacts. 20. A substance that can be further simplified may be either (A) an element or a compound (B) an element or a mixture (C) a mixture or a compound (D) a mixture or an atom ans. 20. (C) Elements cannot be further decomposed. An atom is best described as a particle, not a substance. 21, A substance composed of two or more elements chemically united is called (A) an isotope (B) a a compound (C) an element (D) a mixture ans. 21. (B) The question defines a compound 22. An example of a chemical change is the (A) breaking of a glass bottle (B) sawing of a piece of wood (C) rusting of iron (D) melting of an ice cube ans. 22. (C) The rusting of iron produces a new substance, iron (II) oxide. The production of new substances is what chemical change is about. 23. A substance that cannot be further decomposed by ordinary chemical means is (A) water (B) air (C) sugar (D)silver ans. 23. (D) Silver is an element, the other substances are not. 24. An example of a physical change is (A) the fermenting of sugar to alcohol (B) the rusting of iron (C) the burning of paper (D) a solution of sugar in water ans. 24. (D) Making a solution does not produce a new substance. 25. Chemical action may involve all of the following except (A) combining of atoms of elements to form a molecule (B) separation of the molecules in a mixture (C) breaking down compounds into elements (D) reacting a compound and an element to form a new compound and a new element ans. (B) a mixture is just a physical combination. No chemical action is required to separate the components. (Grandm is going to put these last two questions with the next lesson)