7) A physical change A) occurs when propane is burned for heat B) occurs when su

Question

7) A physical change A) occurs when propane is burned for heat B) occurs when sugar is heated into caramel. C) occurs when water is evaporated. D) occurs when iron rusts E) occurs when glucose is converted into energy within your cells 8) Determine the name for CoCl2 6H20 A) cobalt (11) chloride hexahydrate B) cobalt (T) chloride C) cobalt chloride hydrate D) cobalt (1I) chloride heptahydrate E) cobalt (D chloride heptahydrate 9) Convert 15 m3 to liters. A) 1.5. 101 L B) 1.5 102 C)1.5 30-2L D) 1.5L 10) Determine the name for H2CO3 A) hydrocarbonic acid B) dihydrogen carbonate C) carbonous acid D) carbonic acid E) hydrocarbide acid 11) The diameter of an atom is approximately 1 . 10.10 m. What is the diameter in decimeters? A) 1-10-24 dan B)1 10-9 dm C)1 .10-21 dm D) 1·10-6 dm 12) If the temperature is 228p, what is the temperature in degree, cellul A) 501°C B) -45 C C) 428 C E) 4424 C 13) Which of the following contains the MOST atoms? You shouldn't need to do a cakulation here E) 100g He A) 100 g Rb B) 10.0 g K C) 100gMg D 100g Ba 14) Which of the following statements is FALSE according to Dalton's Atomie Theory B) All atoms of chlorine have identical properties that distinguish them from other elements C) One carbon atom will combine with one oxygen atom to form a molecule of carbon monoxide D) An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of A) Atoms combine in simple whole number ratios to form compounds nitrogen. E) Atoms of sodium do not change into another element during chemical reaction with chlorine. 15) Give the correct formula for aluminum sulfate B) Als(SO42 C) Al2(043 D) AISO4)3 A) Al2504 16) What answer should be reported, with the correct number of significant figunes, for the following calculation E) 457 D) 457277 (249.362+41)/63.498 C)45728 B) 4.6 A) 4.573 B-2

Explanation / Answer

7)

Physical changes occur when objects or substances undergo a change that does not change their chemical composition.

Here in evaporation of water there is no chemical change hence the correct answer is C)

8)

CoCl2 .6H2O

Cobalt chloride Hexahydrate

9) 15.0 m^3 into L

1.0 M^3 = 1000 l

15.0 m^3 = 15.0*1000 L =1.5*10^4 L.

10) The name of H2CO3 is

Carbonic acid

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