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3 years ago

10. Well into the twentieth century, many scientists believed the ocean floor was A. rocky. B. round. C. flat. D. sandy.

2 answers:

8 0

In the 20th century, the scientist believed that the floor of the ocean floor is flat. But later on discovered that their theory is wrong. The ocean floor is not flat and featureless. One technology helped the scientist to study in advance and in details the real feature of the ocean floor. They used sound waves to know the distance of the water from floor level to the top. They also discovered that ranges of mountains lies under the ocean. Sonar was one of the technologies they used to study the sound waves emitted by the ocean. Hope i was helpful :)

denpristay [2]3 years ago

3 0

C. flat
the ocean was believed to be flat before they had sonar

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Calcium oxide (CaO) reacts with tetraphosphorus decoxide (P4O10) to form calcium phosphate (Ca3(P4O10)2) according to this equat

Ksenya-84 [330]

Answer:

The percent yield of the reaction is 80%

Explanation:

6CaO + P4O10→2Ca3(PO4)2

Relation is 1 mol P4O10 to make 2 moles Ca3(PO4)2 (100% yield)

Molar mass P4O10 = 283,8 g/m

Molar mass Ca3(PO4)2 = 309,8 g/m

Mass /Molar mass = moles

I have 14,2 g P4O10 so I have 14,2g /283,8g/m = 0,05 moles

It was converted 24,8 g Ca3(PO4)2 so it was converted:

24,8 g /309,8 g/m = 0,08 moles

In the 100 % yield of the reaction:

1 mol P4O10 _____ 2 moles Ca3(PO4)2

I use 0,05 moles P4O10 ____ so I made (0,05 moles . 2 moles)/1 mol = 0,1 moles

0,1 moles converted of Ca3(PO4)2 ____ 100 %

0,08 moles moles I converted of Ca3(PO4)2 ____

(0,08 moles . 100%) / 0,1 moles = 80%

4 0

4 years ago

Diffusion is the movement of solutes from an area of

ollegr [7]

Answer:

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3 years ago

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The ester below can be separated into phenol and an acetate salt, via saponification: heating the ester with a strong base, such

erastovalidia [21]

I found a similar question online which will help me answer your incomplete question. To make it easier, show all the elements of the compound given. It is shown in the second picture attached.

a.) The formula for unsaturation number is shown in the 3rd picture attached. Following this,
n = 8
m = 2(8) + 2 + 0 + 0 - 0 = 18
Thus,
x = Unsaturation number = (18 - 8)/2 = 5
The unsaturation number is 5.

b.) The molar mass of C is 12.01 g/mol; H is 1 g/mol; O is 16 g/mol. So, the molecular weight is:
Molecular weight = 12.01(8) + 8(1) + 2(16) = 136.08 g/mol
The molecular weight of the ester is 136.08 g/mol.

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3 years ago

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MaRussiya [10]

Answer:

Mars

Explanation:

neither Mercury nor Venus have any moons at all, Earth has one and Mars has its two small moons

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2 years ago

Karen measures the volume of gas at 200 K and 100 kPa. To correct her measurement to standard temperature and pressure (STP), wh

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I believe the correct answer from the choices listed above is option A. To correct her measurement to standard temperature and pressure (STP), she should make a volume correction based on a higher temperature of 273 K. Hope this answers the question. Have a nice day.

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