Ch 2 Chem 110 D B, C TIPLE CHOICE Choose the one alternative that best 1) ane is

Question

Ch 2 Chem 110 D B, C TIPLE CHOICE Choose the one alternative that best 1) ane is always completes the statement or answers the question. Hept composed of 840% carbon and 160s,hydrogen mis mustrases law of i) multiple proportions. of the above 2) The Greek word atomos means A) continuous. B) invisible, 3) The amount of carbon on the earth, including the atmosphere. constant. ncreasing due to plant the planet. Co is decreasing due to consumption of carbon based fuels, such as coal and petroleum. D) fluctuates dramatically with the seasons. 4) By definition, which of the following can be broken down into simpler substances one of the postulates 5) Although all parts (postulates) o Dalton's atomic theory are important, which is crucial to explain the observations summarized by the Law of Definite Proportions? Atoms are very small. whole number ratios to form compounds. Atoms combine with other atoms in fixed, B Atoms of the same element have the same properties. D) Matter is composed of atoms. 6) Which of the following parts (postulates) of Dalton's atomic theory has been modified in light of later d small particles called atoms. A) All matter is made up of very B)Atoms are indivisible. atoms, Chemical reactions involve rearrangement of Compounds are formed from atoms. Which one of the following is NOTpart of Dalton's atomic theory? A) Atoms of the same element have the same properties. B) Matter is composed of atoms. properties. toms of different elements have different D) atoms change into other atoms in chemical reactions. 8) Which one of the following does NOT r in a chemical reaction? atoms. A) ms react with other atoms. B) Matter is rearranged. other D) Atoms are changed into Matter is conserved 9) 9) A mixture containing 40grams of carbon and 70 grams of oxygen is sealed in flask. The total mass of the system is 210 grams. The flask is heated to cause the carbon and a sealed oxygen to react The flask is massed. What is the ss of the sealed flask? 140 grams B) 210 grams c) 170 gra A) 110 grams B-1

Explanation / Answer

21)

Any substance that contains only one kind of an atom is known as an element. So Mg, Hg and O are elements.

Two or more elements combine to form substance. So HgO is substance.

24)

The Law of Definite Proportions, states that any chemical compound will always contain a fixed ratio of elements by mass.

H2+1/2O2 H2O

The atomic weight of hydrogen is 1, and the atomic weight of oxygen is 16, so 18 g of H2O would produce from16 g of O, and 2 g of H. similarly 20 g of H combines with 160 g of O to form 180 g of H2O.

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