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3 years ago

Who developed the first fabricated obturator? A. Paré B. Vesalius C. The Romans D. Fauchard

Chemistry

2 answers:

Nuetrik [128]3 years ago

8 0

The answer to this question is A.Pare

balandron [24]3 years ago

3 0

I believe the correct answer is option A. Paré.

Or otherwise known as Ambroise Paré. He was considered one of the "fathers of surgery" for modern forensic pathology. And was known to be a pioneer in surgical techniques on the battlefield using medicine, mostly in the treatment/healing of wounds.

Hope I could help! :)

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What type of bonds are formed between silicon(Si) and oxygen(O) in silicon dioxide (SiO2), a commonly component of sand?

Sladkaya [172]

Answer:

Silicone Dioxide

Explanation:

It is found on sand since ancient times and also a major component of glass..I have heard of a case when a lightning hit the sand and the sand actually turned into a somewhat glasslike figure

6 0

3 years ago

Which substance is least soluble at 90°C?

jekas [21]

Answer:

NH3

Explanation:

Which salt is least soluble at 90 degrees Celsius

7 0

3 years ago

How many times a one pound (2.2 kg) block of iron can be split in half before it stops being iron.

aleksley [76]

Answer:

Number of times a one pound (2.2 kg) block of iron can be split in half before it stops being iron

= 84.29 times

Explanation:

Atoms : It is the smallest indivisible particle of the matter .

The atom can not be further breakdown .

Here in this question , we have to find the number of atoms (because it is the last possible situation for breaking of atom)

Mole : The quantity of the substance that contain as many particles as present in 12 g of C-12.It is quantity which Avogadro number(N0) of particles

$N_{0}=6.022\times 10^{23}$

1.First calculate the number of moles of Fe in 2.2Kg Block

Mass of Iron (Fe) = 55.845 amu

Molar mass of Iron = 55.845 g

Given mass = 2.2 kg

1 kg = 1000 g

2.2 kg = 2200 g

$moles = \frac{given\ mass}{Molar\ mass}$

$moles = \frac{2200}{55.845}Moles of Fe = 39.39 2.Calculate the number of particles of Fe in 39.39 moles of Block[tex]moles = \frac{Number\ of\ Particles}{Avogadro\ number}$

$Avogadro\ number = 6.022\times 10^{23}$

moles = 39.39

$39.39 = \frac{Number\ of\ Particles}{N_{0}}$

$Number\ of\ Particles=39.39\times 6.022\times 10^{23}$

$Number\ of\ Particles= 2.37\times 10^{25}$

$2.37\times 10^{25}$ atoms

3.Calculate Number of time(n), the block is split into -Half 

$2^{n}=2.37\times 10^{25}$

Take log both side ,

$n\ log2 = log(2.37\times 10^{25})$

Solve for n, you get

n= 84.29 (convert it to nearest whole number)

n = 84 times

7 0

3 years ago

How much water has to be evacuated from 250ml of 1M Ca(OH)2 to make it 3M

lorasvet [3.4K]

Answer:

ERROR

Explanation:

Answer could not be show due to technical difficulties

6 0

3 years ago

Temperature also affects the motion of atoms in a gas. Given what you know about temperature, pressure, and volume, which statem

vampirchik [111]

Answer:

C) As a gas is heated, the pressure decreases.

Explanation:

From the choices given, the statement that "as a gas is heated, the pressure decreases is false".

When gases are heated, their molecules expands and the volume of the gas increases. In a fixed container, the pressure of the gases will also increases.

Gases lack internal cohesion and very weak to no intermolecular forces binding them together.
When they are subjected to heat, they gain more energy(kinetic energy) which causes them to begin to spread out.
Thus, they take up even more space allowing volume to increase appreciably.

3 0

3 years ago