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3 years ago

Atom

Chemistry

2 answers:

hammer [34]3 years ago

8 0

Hello, There!

<h2>Question</h2>

Atom

Atomic theory of atoms:

Element:

Gas:

Liquid:

Magnetic field:

Particle:

Phase:

Plasma:

Scientific theory:

Solid:

Write the Meanings

<h2>Answer</h2>

Atom: the basic unit of an element

Atomic theory of atoms: a theory that states that all matter is made of atoms that cannot be divided or destroyed

Element: a substance that cannot be broken down into a simpler substance

Gas: the state of matter that does not have a definite shape or a definite volume

Liquid: the state of matter that has an indefinite shape but a definite volume

Magnetic field: a region around a magnetic material or moving electric charge

Particle: a tiny piece of matter

Phase: a unique form of the existence of matter

Plasma: an ionized gas of positively and negatively charged particles

Scientific theory: an explanation for some naturally occurring event, developed from extensive observations, experimentation, and reasoning

Solid: the state of matter that has a definite shape and volume

Therefore, I hope this helps And Good Luck!

Hoochie [10]3 years ago

4 0

Answer:

atomic theory of atoms- the scientific theory that matter is composed of particles called atoms. Atomic theory traces its origins to an ancient philosophical tradition known as atomism

element- each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms.

gas- a substance or matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape (unlike a solid) and no fixed volume (unlike a liquid).

liquid- a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. ... Like a gas, a liquid is able to flow and take the shape of a container. Most liquids resist compression, although others can be compressed.

magnetic field- a region around a magnetic material or a moving electric charge within which the force of magnetism acts.

particle- is a small localized object to which can be ascribed several physical or chemical properties, such as volume, density, or mass

phase- is a region of space, throughout which all physical properties of a material are essentially uniform

plasma- is one of the four fundamental states of matter, first systematically studied by Irving Langmuir in the 1920s. It consists of a gas of ions – atoms or molecules which have one or more orbital electrons stripped, and free electrons and an ionized gas consisting of positive ions and free electrons in proportions resulting in more or less no overall electric charge, typically at low pressures (as in the upper atmosphere and in fluorescent lamps) or at very high temperatures (as in stars and nuclear fusion reactors).

Scientific theory- is an explanation of an aspect of the natural world and universe that has been repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results.A theory is a carefully thought-out explanation for observations of the natural world that has been constructed using the scientific method, and which brings together many facts and hypotheses.

solid- is one of the three fundamental states of matter. The molecules in a solid are closely packed together and contain the least amount of kinetic energy. A solid is characterized by structural rigidity and resistance to a force applied to the surface. a substance or object that is solid rather than liquid or fluid.

Explanation:

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15% by volume of blood your brain gets at rest. Your body contains 5.2 L of blood, how many liters of blood are in your brain at

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Answer: 0.8242182 quarts of blood will be present in the brain at rest.

Solution:

According to question: 15% by volume of blood your brain gets at rest

if we are having 5.2 L of blood in our body , then blood present in our brain at rest:

$15\%\text{of the 5.2 L of blood}=(5.2 L)\times \frac{15}{100}=0.78 L$

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3 years ago

After distilling your crude methyl benzoate, you set aside 4.83 grams of the purified ester. You then prepare the grignard reage

Ber [7]

Answer:

95.6 %

Explanation:

For this question, we will have 2 reactions, the formation of the grignard reagent and the formation of the alcohol. The first step then is the calculation of the maximum amount of the grignard reagent. For this, we have to convert the grams to moles and check the smallest value. To do this we have to take into account the following conversion ratios:

Molar mass of Mg = 24 g/mol

Molar mass of phenylmagnesium bromide ( $C_6H_5Br$ )= 157 g/mol

Density of bromobenzene= 1.5 g/mL

Molar ratio between Mg and $C_6H_5Br$ = 1:1

$2.3~g~Mg\frac{1~mol~Mg}{24~g~Mg}=0.096~mol~Mg$

$9.45~mL~\frac{1g}{1.5mL}\frac{1~mol~C_6H_5Br}{157~g}=0.0402~mol~C_6H_5Br$

The smallest value is the mol of bromobenzene therefore 0.0402 mol of phenylmagnesium bromide would be produced.

The next step is repite the same steps for the reaction of formation of the alcohol. Therefore we have to find the moles of methyl benzoate, so:

Molar mass of methyl benzoate: 136.14 g/mol

$4.83~g~\frac{1~mol}{136.14~g}=0.35~mol$

The we have to divide by the coefficient of each reactive in the balance reaction. So:

$\frac{0.35~mol}{1}=0.35$

$\frac{0.0402~mol}{2}=0.0201$

Therefore the limiting reagent would be the phenylmagnesium bromide. Now, the molar ratio between the phenylmagnesium bromide and triphenyl carbinol is 2:1, so the amount of alcohol produced is 0.0201 mol triphenyl carbinol. The next step is the conversion from mol to grams of triphenyl carbinol:

Molar mass of triphenyl carbinol= 260.33 g/mol

$0.0201~mol\frac{260.33~g}{1~mol}=5.23~g~triphenyl carbinol$

Finally, we have to divide the obtanied solid by the calculated one:

$Percentage=\frac{5}{5.23}*100=95.6\%$

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