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scZoUnD [109]
3 years ago
9

Several teeth were found in an area of flat land covered with trees and plants. The teeth were examined by a paleontologist, and

it was determined that the teeth came from a shark. They found many other shark teeth in this area. However, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. What is the paleontologist's BEST explanation for why the teeth were found in this area? A) Sharks used to live on flat land. B) This area was once covered with salt water. C) This area was once covered with freshwater. D) Someone buried the shark teeth deep in the ground.
Chemistry
2 answers:
Fed [463]3 years ago
8 0
B) This area was once covered by salt water

This is not uncommon, people have found full body megalodon fossils in the middle of the desert. You have to member erosion, weathering, the Continental drift, and places rising up out of the oceans (islands).
djverab [1.8K]3 years ago
3 0
B because that makes the most sense
You might be interested in
Calculate the percentage of the void space out of the total volume occupied by 1 mole of water molecules. The density of water i
gtnhenbr [62]

Answer:

The percentage of the void space out of the total volume occupied is 93.11%

Explanation:

A mole of water contains 2 atoms of hydrogen and 1 atom of oxygen.

To calculate the volume of a mole of water, we calculate 2 times the volume of the hydrogen atom and 1 times the volume of the oxygen atom

Let's calculate this one after the other.

For the hydrogen, formula for the volume will be

V_{hydrogen = 2 × 4/3 × π × r_{H}^{3}

where r_{H}^{3} = 37 pm which is read as 37 picometer (1 picometer = 10^-12 m) = 37 × 10^{-12} meters

Volume of the hydrogen = 8/3 × (37 × 10^-12)^3 = 4.05 * 10^-31

we multiply this by the avogadro's number = 6.02 * 10^23

= 4.05 * 10^-31 * 6.02 * 10^23 = 2.6 * 10^-8 m^3

We do same for thr oxygen, but this time we do not multiply the volume of the oxygen by 2 as we have only one atom of oxygen

Volume of oxygen = 4/3 * π * (73 * 10^-12) ^3 * avogadro's number = 9.81 * 10^-7 m^3

adding both volumes together, we have 1.24 * 10^-6 m^3 or simply 1.24 ml ( 0.01 m = 1 ml)

Dividing the molar mass of one mole of water by its density, we can get the volume of 1 mole of water

= (18g/mol)/(1 g/ml) = 18 ml/mol

Now we proceed to calculate the volume of void = Total volume - volume of molecule = 18 - 1.24 = 16.76 ml

Now, the percentage of void = volume of void/total volume * 100%

= 16.76/18 * 100% = 93.11%

7 0
3 years ago
Initial mass of triphenyl methanol in g = 0.220g Initial volume of 33% HBr solution in ml = 0.60 ml Find mas of triphenyl bromid
tensa zangetsu [6.8K]

Answer:

0.792g of triphenyl bromide are produced.

Explanation:

The reaction of triphenyl methanol with HBr is:

triphenyl methanol + HBr → Triphenyl bromide.

<em>Reaction (1:1), 1 mole of HBr reacts per mole of triphenyl methanol.</em>

<em />

To know the mass of triphenyl bromide assuming a theoretical yield (Yield 100%) we need to find first <em>limiting reactant</em>:

Moles triphenyl methanol (Molar mass: 260.33g/mol) =

0.220g × (1mol / 260.33g) = <em>8.45x10⁻³ moles Triphenyl methanol</em>

Moles HBr (Molar mass: 80.91g/mol; 33%=33g HBr/100mL) =

0.60mL ₓ (33g / 100mL) ₓ (1mol / 80.91g) = <em>2.45x10⁻³ moles HBr</em>

<em />

As amount of moles of HBr is lower than moles of triphenyl methanol, HBr is <em>limiting reactant.</em>

<em />

As HBr is limiting reactant, moles produced of triphenyl bromide = moles HBr = <em>2.45x10⁻³ moles</em>

As molar mass of triphenyl bromide is 323.2g/mol, mass of triphenyl bromide is:

2.45x10⁻³ moles × (323.2g / mol) =

<h3>0.792g of triphenyl bromide are produced.</h3>
5 0
4 years ago
Which is a higher temperature 20°c or 25?
Lunna [17]
25 °c is the higher temperature.

Hope This Helps You!
Good Luck Studying :)
3 0
4 years ago
Read 2 more answers
Rank the following metals in order of increasing activity: Pb, Mg, Cu, and Ag
Goryan [66]
They would be the following

Mg, Pb, Cu, Ag
8 0
3 years ago
What is the molar mass of C2H6O
Neporo4naja [7]
46.0684g I think because you have to concert grams to moles or moles to grams
5 0
3 years ago
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