PLEASE HELP, MAJOR, MARKED AS BRAINEST

Answer:

nucleus

Explanation:

Answer:

The nucleus

Explanation:

The nucleus can be thought of as the brains of a cell.

-CancerQuest

Answer:

lubricating oil

Explanation:

Of the given fractions, lubricating oil has the highest boiling point of all.

It is a petroleum fraction used for lubrication and reducing friction between moving parts of machineries .

Answer:

207g/mol

Explanation:

Given parameters:

Mass of the lead  = 41.4g

Number of moles  = 0.2mole

Unknown:

Molar mass of lead = ?

Solution:

The molar mass of substance is related to mass and number of moles using the expression below;

           Mass = number of moles x molar mass

        Molar mass = [tex]\frac{mass}{number of moles }[/tex]

Now insert the parameters and find the molar mass;

     Molar mass = [tex]\frac{41.4}{0.2}[/tex]   = 207g/mol

Answer:

22 mol

Explanation:

Given data:

Number of atoms of Cl = 2.65×10²⁵ atom

Number of moles of Cl = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

2.65×10²⁵ atom × 1 mol / 6.022 × 10²³ atoms

0.44×10² mol

22 mol

Answer:

V = 96.61 L

Explanation:

Given data:

Number of moles = 4.0 mol

Pressure = 780 torr (780/760 = 1.03 atm)

Temperature = 30°C

Volume of gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

30+273 = 303 K

1.03 atm × V = 4.0 mol × 0.0821 atm.L/ mol.K  × 303 K

V = 99.505 atm.L / 1.03 atm

V = 96.61 L

Answer:

A

Explanation:

Answer:

A

Explanation:

Not D or B

Answer:

B. Slightly acidic

Explanation:

pH can be defined as a measure of the negative logarithmic concentration of hydrogen ion (H+) in an aqueous solution.

Basically, the pH scale is used to measure the level of acidity or basicity of an aqueous solution based on a scale of 0 to 14.

An acidic solution has a pH lower than 7 (0 - 6), a basic solution has a pH higher than 7 (7 - 14) and a neutral solution has a pH of exactly 7.

In this scenario, a student was assigned to take water samples from a lake near his home he measured the Ph of one of the water samples to be 6.0. Therefore, this sample of water can be said to be slightly acidic its pH is slightly below 7.

Answer: what is it I need help

Explanation: step by step

Answer:

First you need to get liters to moles to mass. So 14.8 times 1 mol over 22.4 times the mole ratio 1:3 times molar mass over one mol. There you have it. Sorry I haven’t solved it yet and don’t know the right answer as soon as I do know I’ll edit this and say the correct answer

Explanation:

Answer:

81

Explanation:

“Atomic mass” is relative to the isotope carbon-12 weighing exactly 12 atomic mass units. Therefore “atomic mass” is precisely the same as “relative atomic mass.”

Two further points:

First, atomic mass as stated on the periodic table is a average of the masses of an element’s naturally-occurring isotopes, weighted by their abundance. This is because atomic mass as normally used is a bulk property: we weigh out many trillions of atoms at a time, because we usually deal in macroscopic quantities. And that means that an average mass is more useful to us.

Second, all masses are relative masses (until the new, physical-constant-based kilogram comes online; and arguably even then). We mass something by comparing it to some standard of reference: until later this year, that something is a chunk of alloy in Paris, France. When the new standard comes into use, we will be comparing the kilogram’s gravitational mass to the strength of the electromagnetic force.

But that’s kind of trivial; it just stems from the fact that any and every measurement is a comparison to something else.

Edit: IUPAC, the world’s premier organization for the imposition of picky definitions that most people never need to use, has the following:

Atomic mass is the mass of a single atom; the unit is the Dalton or unified atomic mass unit. (I would use “isotopic mass” to specify the mass of a particular atom, but that’s not sanctioned by IUPAC.)

Relative atomic mass is the measured average mass of all atoms of a particular element in a particular sample. To make it unitless, it’s divided by the value of the unified atomic mass unit.

Standard atomic weight is the value you read off of the periodic table; it’s an Earth-based average over many samples, of experimental values of the relative atomic mass. Values are promulgated by the IUPAC Commission on Atomic Weights and Isotopic Abundances, and are revised every two years.

Most chemists refer to standard atomic weight as “atomic mass” or “atomic weight” and get on with their lives.

The unified atomic mass unit is 1/12 of the mass of an atom of carbon-12. It is sometimes called the Dalton.

Definitions taken from the IUPAC Gold Book.

As far as I can tell, relative atomic masses and standard atomic weights are made unitless so that they can be used with any convenient macroscopic mass unit to determine correct proportions for a desired chemical reaction.

Answer:

Iron (Fe)

Explanation:

Answer:

flooding throughout North America

Explanation:

An El Niño condition occurs when surface water in the equatorial Pacific becomes warmer than average and east winds blow weaker than normal. The opposite condition is called La Niña. During this phase of ENSO, the water is cooler than normal and the east winds are stronger. El Niños typically occur every 3 to 5 years.

Hope this helps

Answer:

warm water moving towards the coast of South America

Answer:

D

they are used for manufacturing Of diodes

Answer:

is the answer D

Explanation:

hsjskajdidbxksbsvzjwvshhz7duw

Answer:

Fractional distillation

Explanation:

Crude oil, also known as petroleum, is a naturally occurring substance found in the Earth's crust. It is a mixture of different useful substances. These substances are separated from one another based on their individual boiling points in a process called FRACTIONAL DISTILLATION.

The process of fractional distillation entails the application of heat to the crude oil. The different fractions evaporate and condense in the fractionating column depending on their boiling point. The hydrocarbon substances separated are called fractions, and they include bitumen, diesel, kerosene, gasoline, natural gas etc. Therefore, before we can use gasoline (petrol) in our cars, the crude oil needs to be separated into separate products like plastics and ink. This process is called FRACTIONAL DISTILLATION.

Explanation:

lithium hydrogen sodium oxygen

Answer:

No

Explanation:

H2O > H2 + O2

There is an uneven amount of oxygen on the right side

it will look like this balanced:

2H2O(l) > 2H2(g) + O2(g)

Answer:

b. This is a redox reaction in which octane (C8H18) is the reducing agent.

Explanation:

edge 2021 i just did it

The statement which best describes the reaction is:

This is not a redox reaction. It is an example of combustion.

This is a reaction which is accompanied by a change in the oxidation number of the reacting elements

This is a reaction in which a substance burns in air (oxygen) to produce carbon dioxide, CO₂ and water, H₂O

Considering the equation given

2C₈H₁₈ + 25O₂ —> 16CO₂ +18H₂O

we can see that C₈H₁₈ burns in air (oxygen) to produce carbon dioxide, CO₂ and water, H₂O

Thus, we can conclude that the reaction is not redox but an example of combustion reaction

Learn more about combustion reaction:

https://brainly.com/question/13134296

#SPJ2

Answer:

Temperature of gas: 3 Celsius

Temperature of gas: 276 K

Height of the column gas: 5.7 c.m

Volume of gas (V=TTr^2h):cm^3: 0.72

Explanation:

There is a pictucre below to help also

Hopes this helps

Answer:

I hope this helps!

Explanation:

Answer:

The air above land also warms faster than air above the sea. Cooler higher pressure air above the ocean moves toward warmer lower pressue air above land.

Answer:

Use the sources to help you, but I would say above the water.

Explanation:

"However, water heats up much more slowly than land and so the air above the land will be warmer compared to the air over the ocean. The warm air over the land will rise throughout the day, causing low pressure at the surface. Over the water, high surface pressure will form because of the colder air."

AND

"The depth (distance from top to bottom) of the atmosphere is greatest at sea level and decreases at higher altitudes. With greater depth of the atmosphere, more air is pressing down from above. Therefore, air pressure is greatest at sea level and falls with increasing altitude."

I hope this helps you!

Answer:

Explanation:

The mass of the car can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{2000}{2.5} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Anticline

Other than that Just A C:

Explanation:

Answer:

A

Explanation:

Answer:

c. Geosphere

Explanation:

thats it hope this will help

Answer:

The answer is C- Geosphere.

Explanation:

I just took the test and got it right.

The word Geo means earth and it's rocks and minerals.

Hope this helps! (:

Answer:

Speed and 0, at starting point

Answer:

Speed

0,at the starting point

Answer:

d) atmosphere pressure

Answer:

B.) weather

Explanation:

weather is constantly changing everyday and each day presents a new condition:)

Answer:

Molten lead bromide, PbBr 2(l), is an electrolyte. During electrolysis: Pb 2+ ions gain electrons at the cathode and become Pb atoms. Br - ions lose electrons at the anode and become Br atoms, which pair up to form Br 2 molecules.

Explanation:

hope it helps

Answer:

2,5

Explanation:

Solution at attachment box

Producted or consumed material proportional with coefficient of material at reax.

1. density of liquid: 1 g/cm³

2. density of unknown liquid: 2.7 g/cm³

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

The unit of density can be expressed in g/cm³ or kg/m³  

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

ρ = density  

m = mass  

v = volume  

1

.[tex]\tt \dfrac{156-56}{100}=1~g/cm^3[/tex]

2.[tex]\tt \dfrac{27}{(\dfrac{30-20}{1}) }=2.7~g/cm^3[/tex]

Answer:

Fe(s) + 2(H+ , Cl-)(aq) → (Fe2+ , 2Cl-)(aq) + H2(g)

Explanation: