Which of the following statements is FALSE according to Dalton\'s Atomic Theory?

Question

Which of the following statements is FALSE according to Dalton's Atomic Theory? A) An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of nitrogen. B) Atoms of sodium do not change into another element during chemical reaction with chlorine. C) Atoms combine in simple whole number ratios form compounds. D) All atoms of chlorine have identical properties that distinguish them from other elements. E) One carbon atom will combine with one oxygen atom to form a molecule of carbon monoxide4. In a chemical reaction, matter is neither created or destroyed. Which law does this refer to? A) Law of Definite Proportions B) Law of the Conservation of Mass C) First Law of Thermodynamics D) Law of Modern Atomic Theory E) Law of Multiple Proportions What is the mass of 0.500 mol of dichlorodifluoromethane, CCl_2 F_2? A) 121 g B) 242 g C) 4.14 times 10^-3 g D) 60.5 g How many millimoles of Ca(NO_3)_2 contain 4.78 times10^22 formula units of Ca(NO_3)_2? The molar mass of Ca(NO_3)_2 is 164.10 g/mol. A) 20.7 mmol Ca(NO_3)_2 B) 79.4 mmol Ca(NO_3)_2 C) 57.0 mmol Ca(NO_3)_2 D) 12.6 mmol Ca(NO_3)_2 E) 13.0 mmol Ca(NO_3)_2 Identify the compound with covalent bonds. A) NaCl B) Kr C) Li D) CH_4 E) KBr If the walls in a room are 955 square feet in area, and a gallon of paint covers 15 square yards, how many gallons of paint are needed for the room? (3 ft = 1 yd) A) 24 gallons B) 47 gallons C) 21 gallons D) 7.1 gallons E) 2.3 gallons Identify a solid. A) no definite shape and definite volume B) no definite shape and no definite volume C) definite volume and definite shape D) definite volume and no definite shape How many Fe atoms are contained in 787 g of Fe? A) 5.90 times 10^25 Fe atoms B) 7.09 times 10^21 Fe atoms C) 4.27 times 10^22 Fe atoms D) 4.18 times 10^24 Fe atoms E) 8.49 times 10^24 Fe atoms Barium belongs to the ______ group of the periodic table. A) alkali metal B) alkaline earth metal C) noble gas D) halogen

Explanation / Answer

12)

this is theoretical question

Answer: C

13)

this says that mass is neither created nor destroyed

So, mass is conserved

Answer: B

14)

Molar mass of CCl2F2,

MM = 1*MM(C) + 2*MM(Cl) + 2*MM(F)

= 1*12.01 + 2*35.45 + 2*19.0

= 120.91 g/mol

mass of CCl2F2= molar mass of CCl2F2 * number of mol

= 120.91 g/mol * 0.500 mol

= 60.5 g

Answer: D

I am allowed to answer only 1 question at a time

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