define "seperation of centrifugation"




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Answer:

C.the Earth’s distance from the sun

Explanation:

Distance Does Not Cause Seasons

It is a common misconception that seasons occur because of Earth's elliptical orbit around the Sun, with winter occurring when Earth is farthest away from the Sun, and summer when it is closest to it. However, our planet's distance from the Sun has little effect on the onset of seasons.

The distance of the earth from the sun does not cause seasonal change. Therefore, option (C) is correct.

The seasons are changing depending on the sunlight reaching the Earth as it orbits around the sun during the year. The season changes are caused by the Earth as it is tilted on its axis. The earth travels each year in a loop around the sun.

The hemisphere of the Earth has tilted towards or away from the Sun. Because of that, there are different types of seasons are formed which are experienced in a whole year.

Summer season occurs on the earth when the hemisphere is tilted towards the sun and winter occurs in the hemisphere tilted away from the sun.

Because sunrays travel directly to the surface of Earth, the hemisphere which is tilted toward the sun is warmer. So they are less scattered in the atmosphere.

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Answer:

Na2So4

Explanation:

Na is group 1, so has a charge of 1+

Sulphate’s formula is SO4 2-,

because sulphate has double the charge of Na, you need two Na’s to make it equal.

Therefore it’s Na2SO4

Answer:

K = 351.3

Explanation:

The relationship between the Celsius scale and kelvin scale is;

K = 273 + C

Since the Celsius temperature = 78.3

The kelvin temperature is given as;

K = 273  + 78.3

K = 351.3

Answer:

what do you want me to do my friend my best friend who is a dreamer

Answer:

The 500kg boulder

Explanation:

Answer:

An atom that has fewer neutrons than protons and more electrons than protons is a negative ion. The negatively charged particles in an atom are the electrons. The charge an atom carries depends on the balance between the number of protons and electrons in an atom.

Explanation:

Answer:

What Do Nails Do? Nails protect the sensitive tips of fingers and toes. We don't need our nails to survive, but they do support the tips of our fingers and toes, protect them from injury, and help us pick up small objects.

Answer:

cool

Explanation:

Answer:

Explanation:

is guiZ

Answer:

hfxyktxykt

Explanation:

An earth shelter is a structure (usually a house) with earth (soil) against the walls, on the roof, or that is entirely buried underground.

An earth sheltered house in Switzerland (Peter Vetsch)

Earth acts as thermal mass, making it easier to maintain a steady indoor air temperature and therefore reduces energy costs for heating or cooling.

Earth sheltering became relatively popular after the mid 1970s, especially among environmentalists. However, the practice has been around for nearly as long as humans have been constructing their own shelters.

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Answer:

V1T1=V2T2

Explanation:

V2=V1T1/T2

The final volume of the gas can be determines using the Charles's law of volume and temperature. The volume of helium when temperature increased to  32 °C increases to  48.9 L.

Charles's law states that, at constant pressure, the volume and temperature of a gas are in direct proportionality. Thus, as the temperature increases, volume of the gas increases.

Hence, V/T = constant

Let V1 and T1 be the initial volume and temperature and V2 and T2 be the final quantities. Then, the relation can be stated as ;

V1/ T1 = V2/ T2

Given that initial quantities:

V1 = 26 L

T1 = 17 °C

Final temperature T2 =32 °C

Then, final volume V2 = V1 T2/T1

V2 = (26 L × 32°C)/ 17 °C = 48.9 L

Therefore, the volume of helium gas increases to 48.9 liters.

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Answer:

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Answer:

river or lake

Explanation:

Answer: The sodium peroxide needed per sailor in a 24 hr period is 674 grams.

Explanation:

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 1.02 atm

V = Volume of gas = 150.0 ml = 0.15 L

n = number of moles  of carbon dioxide = ?

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]20^0C=(20+273)K=293K[/tex]

[tex]n=\frac{PV}{RT}[/tex]

[tex]n=\frac{1.02atm\times 0.15L}{0.0821 L atm/K mol\times 293K}=0.006moles[/tex]

[tex]2Na_2O_2(s)+2CO_2(g)\rightarrow 2Na_2CO_3(s)+O_2(g)[/tex]

According to stoichiometry:

2 moles of carbon dioxide require = 2 moles of sodium peroxide

Thus 0.006 moles carbon dioxide require= [tex]\frac{2}{2}\times 0.006=0.006[/tex] moles of  sodium peroxide

Mass of  sodium peroxide needed for 24 hour=[tex]moles\times {\text {Molar mass}}=0.006mol\times 78g/mol\times 24\times 60=674g[/tex]

Thus sodium peroxide needed per sailor in a 24 hr period is 674 grams.

The amount (in grams) of sodium peroxide needed per sailor in a 24 hr period is 673.92 g

Using the ideal gas equation, we can obtain the mole of CO₂ as follow:

n = PV / RT

n = (1.02 × 0.15) / (0.0821 × 293)

n = 0.006 mole

2Na₂O₂ + 2CO₂ → 2Na₂CO₃ + O₂

From the balanced equation above,

2 moles of CO₂ required 2 moles of Na₂O₂.

Therefore,

0.006 mole of CO₂ will also require 0.006 mole of Na₂O₂.

Mass = mole × molar mass

Mass of Na₂O₂ = 0.006 × 78

Mass of Na₂O₂ = 0.468 g per minute

Mass of Na₂O₂ required for 24 h = 0.468 × 24 × 60 = 673.92 g

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Answer:

C

Explanation

On the reactants side there is 4 Hydrogen atoms in total and two oxygen atoms on the left however on the right there is two hydrogen atoms and one oxygen atom. Leaving this equation unbalanced

The equation that is NOT balanced is [tex]\rm 2H_2 + O_2\rightarrow H_2O[/tex]. The correct answer is option C.

In a balanced chemical equation, the number of atoms of each element on the reactant side must be equal to the number of atoms of each element on the product side.

In conclusion, equation C.  [tex]\rm 2H_2 + O_2\rightarrow H_2O[/tex] is the one that is NOT balanced. It has an unequal number of oxygen atoms on the reactant and product sides.

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Answer:

What is energy transformation? One type of energy can change into another type of energy. Energy transformation means the changing of energy from one type to another, e.g. from kinetic energy to electrical energy, or from potential energy to kinetic energy.

Explanation:

Answer:

It may seem a bit weird, but, I'm only doing this so that you can make that other person brainliest.

Explanation:

The mole fraction of sulfuric acid : 0.073

Given

3.75 M sulfuric acid solution that has density of 1.230 g/mL

Required

The mole fraction

Solution

3.75 M = 3.75 mol/L

For 1 L solution :

mass of solution = 1230 g

mass Sulfuric acid : 3.75 mol x 98 g/mol=367.5 g

mass water = 1230-367.5 = 862.5 g

mol water = 862.5 : 18 g/mol= 47.92

mol total = 3.75 + 47.92 = 51.67

mole fraction of sulfuric acid :

= 3.75 : 51.67

= 0.073

Answer:

does your son ever talk to strangers?

Explanation:

Answer:

Electrons

Explanation:

Answer:

Electrons are not found in the nucleus for they are orbiting the atom.

Answer:

c. 216 g

Explanation:

There is actually 215.852304 but when you round it, you will get 216

Answer:

Mass of ring = 32 g

Volume of ring = 4 mL

Density of ring = 8 g/mL

Explanation:

From the question given above, the following data were obtained:

Mass of ring = 32 g

Volume of water = 64 mL

Volume of water + ring = 68 mL

Density of ring =?

Next, we shall determine the volume of the ring. This can be obtained as follow:

Volume of water = 64 mL

Volume of water + ring = 68 mL

Volume of ring =?

Volume of ring= (Volume of water + ring) – (Volume of water)

Volume of ring = 68 – 64

Volume of ring = 4 mL

Finally, we shall determine the density of the ring. This can be obtained as follow:

Mass of ring = 32 g

Volume of ring = 4 mL

Density of ring =?

Density = mass / volume

Density of ring = 32 / 4

Density of ring = 8 g/mL

Processes in which matter changes between liquid and gaseous states are vaporization, evaporation, and condensation.

When the temperature or pressure of a system change, there occurs a change in the state of matter. The process that change the solid state into the liquid state is called the melting.

The process in which the solid is changed into a liquid is defined as the melting. The temperature at which a solid change to a liquid is known as the melting point.

The other process in which a gas changes to a liquid is known as the condensation. This process is found to be the reverse of evaporation, where liquid water becomes a vapor.

Thus the two processes that change matter to a liquid state are melting and condensation.

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Answer:

An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements. In general, the size of an atom will decrease as you move from left to the right of a certain period.

Explanation:

Answer:

I'd say "a" because not everything with plants and animals is perfectly organized together nothing ever is.

Answer:

cohesion

Explanation: the sticking together of particles of the same substance

Answer:

Converting Between Moles and Liters of a Gas at STP. To convert between moles and the volume of a gas at STP, we will use the factor label method discussed in the first unit. This conversions relies on the fact that a mole of gas at STP has a volume of 22.4 L.

Explanation:

One molecule of carbon dioxide at STP has a volume of 22.4 liters . Thus number of molecules of carbon dioxide in 12.2 L is 3.27 × 10²³ molecules.

A molecule is formed by the combination of same or different kinds of atoms. A number molecules together form a compound. Water, carbon dioxide etc. are compounds.

One mole of a molecule contains 6.022 × 10²³ number of atoms. Similarly, one mole of a compound contains, 6.022 × 10²³ number of molecules.This number is called Avogadro number.

At standard temperature and pressure (STP) that is at 298 K and 1 atm pressure, one mole of any substance carry 22.4 L. Thus number moles of 12.2 L of carbon dioxide is 12.2 / 22.4 = 0.54 moles.

Number of molecules = 0.54 moles × 6.022 × 10²³

                                     =  3.27 × 10²³

Hence, number of molecules of carbon dioxide in 12.2 L is 3.27 × 10²³ molecules.

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Answer:

gas production

Explanation:

Answer:

gas formation

Explanation:

frothy bubbles produced by carbon dioxide gas are a sign that a chemical reaction has occurred when a based is mix with acid.