9. Determine which of the following statements is (are) incorrect with respect t
ID: 546925 • Letter: 9
Question
9. Determine which of the following statements is (are) incorrect with respect to the following chemical equationng statements is incorect a) Two atoms of hydrogen b) The chemical reaction described by this equation conseri occur in both sides of the equation. atoms of hydrogen and chlorine to give hydrogen HC of the nce one molecule of H, and one molecule of CL2 react, two molecules product must form. d) This equation describes a chemical change. solid will float on any liquid that is denser than it is. The volume of a piece of calcite will the calcite (Caco) weighing 35.6 g is 12.9 cm. On which of the following liquids float? Liquid Density (g/cm) Carbon tetrachloride Methylene bromide Tetrabromoethane Methylene iodide .60 2.50 2.96 3.33 There is growing concern today over depletion of the ozone layer in our atmosphere. The mass of this protective layer has been estimated at 2 x 10 metric tons. If the density of ozone is 2.144 x 10 g/cm, what is the volume corresponding to the estimated mass? (1 metric ton-1000kg) 11.Explanation / Answer
9) Two atoms of hydrogen are present in H2 moleule and two atoms are present in two moleucles of HCl (one in each)
Chemical reactions are rearragement. No new atom is generated
Incorrect: Since one molecle of H2 reacts with one molecules of Cl2, two molecules of products are formed
This is not the case always.
Example:
C(s) + 2H2 ---> CH4
H2 + 1/2O2 - --> H2O
d) the equation is describing a chemical change
10) the density of calcite = MAss of calcite / volume = 35.6 / 12.9 = 2.76 g /cm^3
So it is denser than carbon tetrachloride, methylene bromide
It will float over Tetrabromoethane and methylene iodide
3) MAss of protective layer = 2 X 10^9 metric tons = 2 X 10^9 X 1000 Kg = 2 X 10^15 grams
Density of ozone = 2.144 X 10^-3 g / cm^3
Volume = Mass / Density = 2 X 10^15 grams / 2.144 X 10^-3 g / cm^3 = 9.33 X 10^17 cm^3
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