The surface temperature on Mercury has been measured to be 391 K . What is this temperature in degrees Celsius

Answer:

Calculate it, times 6.022

After a workout, most people show signs of strength, warmth, contentment, fulfillment, success, and accomplishment.

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Answer:

Carobon-14 can find the age and also can find how long its been since the organism died.

Explanation:

Carbon-14 is used to esimate the age of carbon containig substances.Carbon atoms circulate between the oceans and living organism at a rate very much faster then they decay.As a result the concentration of C-14 in all living things keep on increasing.After death organism no longer pick up C-14.By comparing the activity of a sample of skull or jaw bones,with the activity of living tissues,we can estimate how long it has been since the organism died.This process is called carbon dating.

Answer:

a-it causes friction to increase

Explanation:

Imagine you have a smooth sheet of ice and you slide a smooth box across it. It'll slide petty far because there's not much friction. The two smooth surfaces aren't "grabbing" each other very much.

Now try to slide that same box over gravel. It's not going to go nearly as far. It gets caught by all the little bits of rock sticking up and falls into the divots.

Another example would be to think of sliding two smooth pieces of paper across each other as opposed to trying to slide a set of velcro the same way.

Whenever you have to answer questions about conceptual friction, it helps to picture it big and in real world examples!

Answer:

R- reactants

arrow- yields

p- products

Explanation:

Answer:

Protein.

Explanation:

Chains of polypeptides make up a protein molecule.

A solution contains 0.0420 M Ca²⁺ and 0.0980 M Ag⁺ . If solid na3po4 is added to this mixture, the phosphate species that precipitate out of solution first is Ca₃(PO₄)₂.

The molarity of [Ca²⁺] = 0.0420 M

The molarity of [Ag⁺] = 0.0980 M

The dissociation is as :

Ag₃PO₄  --->  3Ag⁺   +  PO³⁻₄

Solubility product constant Ksp of Ag₃PO₄  = 8.89 × 10⁻¹⁷

Ksp = [  Ag³⁺] [  PO³⁻₄]

[  PO³⁻₄] =  1.0 × 10⁻¹³

The solubility product constant of Ca₃(PO₄)₂ = 2 × 10⁻³²

Ca₃(PO₄)₂ --->  3Ca²⁺   +   2PO₄³⁻

[PO₄³⁻] = 4.9 × 10⁻¹⁵

Thus,  Ca₃(PO₄)₂ will precipitate the first.

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The layers of the atmosphere can be ranked based on the energy of the photons that are typically emitted there, from highest to lowest as Thermosphere,Mesosphere,Stratosphere and Troposphere respectively.

Based on the energy of the photons typically emitted, the layers of the atmosphere can be ranked as follows:

1. Thermosphere: This layer has the highest energy of photons as it is the region where the sun's radiation is absorbed and ionizes the gas particles. This ionization process releases high-energy photons, including ultraviolet and X-rays.
2. Mesosphere: This layer has a lower energy of photons than the thermosphere. It is the region where meteoroids burn up upon entering the Earth's atmosphere, releasing photons in the form of light.
3. Stratosphere: This layer has a lower energy of photons than the mesosphere. It is the region where ozone is present, which absorbs high-energy ultraviolet radiation from the sun and emits lower energy photons in the form of heat.
4. Troposphere: This layer has the lowest energy of photons as it is the region closest to the Earth's surface and is primarily heated by convection from the ground. The photons emitted here are primarily in the form of infrared radiation.

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Answer:

At -20°C the mercury state will be liquid

Explanation:

The melting point of a substance is the temperature at which it changes from solid state to a liquid state, and the boiling point is the temperature at which it changes from liquid state to a gaseous state.

If mercury melts at -39°C and boils at 356.9°C, it means that if the temperature is lower than -39°C, mercury will remain al solid state. Between -39°C and 356.9°C, the state of mercury will be liquid and, above 356.9°C mercury will remain at gaseous state.

So, at -20°C the mercury state will be liquid, because that temperature it is between -39°C and 356.9°C.

Explanation:

helium

Helium gas is not found in earth crust

Answer:

Definetly Nitrogen

Explanation:

Nitrogen is the most electronegative

Ethanol is produced when ethane and ethene react with water and a catalyst like sulfuric acid. Adding concentrated sulfuric acid to hot ethanol (acts as a catalyst).

To eliminate carbon dioxide and sulphur dioxide that are created as byproducts, the gases are passed through a sodium hydroxide solution. The main product that is gathered over water is ethene. As a result, dehydration of ethanol produces ethene rather than ethane. The names Mattling acid and Oil of Vitriol are other names for sulfuric acid. It is highly caustic and acidic in nature. It dehydrates and oxidises when  present in higher amounts. It is a clear, syrup-like liquid with no colour or smell. A substance having the chemical formula C 2H 6, ethane is an organic chemical.

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The pH of the solution is 9.92,  The pH of a solution involves calculating the concentration of hydrogen ions in the solution

Sr(OH)2 (s) → Sr2+ (aq) + 2 OH- (aq)The next step is to calculate the concentration of hydroxide ions in the solution using the stoichiometry of the balanced equation. We are given that 1.03×10−6 moles of Sr(OH)2 are dissolved in 25.0 mL of solution, so we can use the following equation to calculate the concentration of hydroxide ions:[OH-] = 2 × (1.03×10−6 mol)/(0.0250 L) = 8.24×10−5 M

Finally, we can use the relationship between the concentration of hydroxide ions and the concentration of hydrogen ions in water to calculate the pH of the solution:pOH = -log[OH-] = -log(8.24×10−5) = 4.08pH = 14 - pOH = 14 - 4.08 = 9.92

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Aluminum is easiest to recycle because it is a weak metal and can be used as a filling alloy.

The volume of dry gas = 168 L

Given

175 ml container at 15°C

P total = 752 torr

water vapour = 12.8 torr

Required

The volume of dry gas

Solution

Dalton's law of partial pressure :

P tot = P₁ + P₂ + P₃ ....  

P total = P O2 + P water

P O2 = 752 - 12.8

P O2 = 739.2 torr

Boyle's Law  

At a fixed temperature, the gas volume is inversely proportional to the pressure applied  

P₁V₁ = P₂V₂

739.2 175 = 770 .V₂

V₂ = 168 L

The final temperature of the mixture is approximately 187.5°C.

To determine the final temperature of the mixture, we can use the principle of conservation of energy. The heat gained by the cooler water is equal to the heat lost by the hotter water.

The heat gained or lost can be calculated using the equation:

q = m * c * ΔT

Where:

q is the heat gained or lost

m is the mass of the water

c is the specific heat capacity of water (approximately 4.18 J/g°C)

ΔT is the change in temperature

Since we have volumes of water, we need to convert them to masses using the density of water, which is approximately 1 g/mL.

The mass of 30.0 mL of water is 30.0 g, and the mass of 50.0 mL of water is 50.0 g.

Let's assume the final temperature of the mixture is T.

The heat lost by the hotter water can be calculated as:

q1 = m1 * c * (T - 345)

The heat gained by the cooler water can be calculated as:

q2 = m2 * c * (T - 282)

Since the total heat lost by the hotter water is equal to the total heat gained by the cooler water, we have:

q1 = q2

m1 * c * (T - 345) = m2 * c * (T - 282)

Simplifying the equation:

30.0 * (T - 345) = 50.0 * (T - 282)

Solving for T:

30.0T - 10350 = 50.0T - 14100

20.0T = 3750

T ≈ 187.5°C

Therefore, the final temperature of the mixture is approximately 187.5°C.

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Answer:

The Solar Nebula Theory accounts for the creation of solar systems, stars, and planets. The theory accounts for planet composition by stating that iron compounds, silicates, and dust clump together to form planetesimals. Because of the proximity of the sun, ices and gases cannot condensate near them, so they do not become gas giants. The planetesimals then collide together due to gravity and collect to form our rocky planets.

Explanation:

Answer:

Volcanic eruptions.

When you turn the transmitter so that charges move in a east-west direction, the polarization of the resulting electromagnetic waves will change.

Polarization is the orientation of the electric field vector of an electromagnetic wave. In electromagnetic wave generated by north-south current in a wire, electric field vector will be oriented in an east-west direction. If the current in the wire is moving in east-west direction, the electric field vector of resulting electromagnetic wave will be oriented in a north-south direction.

So, if you change the direction of electric charges in the wire,  polarization of the resulting electromagnetic waves will change.

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Answer:

One factor that affects that affects the direction of the current is the direction of motion of the wire

Explanation:

According to Fleming's right hand rule when a conductive wire which is within a circuit is moved through a magnetic field, due to Faraday's law of electromagnetic induction an electric current is induced in the wire such that the direction of motion of the wire, the direction of the magnetic field and the direction of the electric current are perpendicular to each other such that if the right hand has the thumb middle finger and the index finger held perpendicular to each other

The motion of the wire being in the direction of the wire

The first or index finger points in the direction of the magnetic field

The middle finger points in the direction of the induced electric current

Therefore, the direction of the the current depends on the direction of motion of the wire.

Answer:

A supported by scientific evidence

Answer: The sun

Explanation: The sun makes the water evaporate and the clouds soak it up like a sponge and transport it.

B. The sun

The atmosphere is the superhighway in the sky that moves water everywhere over the Earth. Water at the Earth's surface evaporates into water vapor which rises up into the sky to become part of a cloud which will float off with the winds, eventually releasing water back to Earth as precipitation. The sun makes the water evaporate and the clouds soak it up like a sponge and transport it.

Therefore, the correct option is B.

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The compound formed by the complete combination of 8.20g of magnesium with 5.40g of oxygen has the following percent composition:

Magnesium: 60.27%

Oxygen: 39.73%

To find the percent composition of the compound, we need to calculate the masses of magnesium and oxygen in the compound and then express them as percentages of the total mass.

Calculate the number of moles for each element:

Number of moles of magnesium = mass of magnesium / molar mass of magnesium

Number of moles of oxygen = mass of oxygen / molar mass of oxygen

Determine the mass percent of each element:

Mass percent of magnesium = (moles of magnesium * molar mass of magnesium) / total mass of compound * 100%

Mass percent of oxygen = (moles of oxygen * molar mass of oxygen) / total mass of compound * 100%

Add the mass percent values to obtain the percent composition of the compound.

In this case, the molar mass of magnesium is 24.31 g/mol and the molar mass of oxygen is 16.00 g/mol. Calculating the moles and mass percent for each element using the given masses, we find the percent composition of the compound to be 60.27% magnesium and 39.73% oxygen.

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The correct model is the one on the right, as it shows that the total number of atoms on the reactant side  is equal to the total number of atoms on the product side .

Reactant is a substance that participates in a chemical reaction and is consumed in the process. Reactants are typically the starting materials or elements in a chemical reaction, and the resulting products are known as the products of the reaction. Reactants may be either organic molecules or inorganic compounds, and they can be either a single element or a combination of elements. Reactants are transformed during the course of the reaction into the products, which are usually different from the reactants. Reactants can be identified by the chemical equations that represent the reaction.

The correct model is the one on the right, as it shows that the total number of atoms on the reactant side (4 atoms of nitrogen and 4 atoms of hydrogen) is equal to the total number of atoms on the product side (3 atoms of nitrogen and 3 atoms of hydrogen). Therefore, the mass is conserved in the reaction.

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Answer:

Yes

Explanation:

The compounds have both hydrogen and carbon only which are atoms that make up the hydrocarbons and they are also gases at room temperature

Answer:

118MOLS

Explanation:

M1VI=M2V2

THE REST WORK OUT ( BA UNZA STUDENTS HE HE HE )

16.01  grams of oxygen must have reacted .

Calculation :

Reaction :      2Cu + O₂  ->  2CuO

Theoritical moles of   Cu : O₂  = 2 : 1

Moles of Cu = mass/molar mass = 63.6/63.546 = 1.001 mol

Moles of O₂  = mass/molar mass  = 71.6/32.0 = 2.238 mol

Experimental of Cu  : O₂   =   1.001  :  2.238   =   0.4  : 1.0

Excess reactant is O₂

Limiting reactant is Cu

Moles of O₂ reacted = 0.5*moles of Cu

moles of O₂ reacted = 0.5 x 1.001  = 0.5004 mol

mass of O₂ reacted  =  moles x molar mass  =  0.5004 x 32.00 = 16.01 g

mass of O₂ reacted is  16.01 g

A chemical reaction is the process of chemical transformation of one group of chemicals into another group.  Classical chemical reactions involve changes that affect only the position of electrons in forming and breaking chemical bonds between atoms, with no changes in the nucleus (no changes in the elements present) and many If , it can be described by a chemical equation. Nuclear chemistry is a subfield of chemistry that deals with chemical reactions of unstable radioactive elements in which both electronic and nuclear changes can occur.

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A helical section that moves dramatically when NTP (nucleoside triphosphate) is bound is called the "P-loop". P-loop NTPases are a family of proteins that hydrolyze NTPs, and the conformational change in the P-loop region is a critical step in the catalytic cycle of these proteins.

The P-loop is named after the conserved motif (GxxxxGKS/T) that forms the base of the loop and interacts with the phosphate groups of the NTP substrate. When NTP is bound, the P-loop undergoes a conformational change that results in the formation of a catalytic site for NTP hydrolysis. Therefore, the P-loop is a key structural element in the function of P-loop NTPases.

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Answer:

C. how many particles are in the substance

Answer:

it is how hot or cold so bassically c in my test

Explanation:

Group 18 elements Kr and Xe have selected oxidation states other than zero, indicating that they have some degree of chemical reactivity.

Group 18 elements, also known as noble gases, are characterized by their low reactivity. This is due to their stable electron configurations, which result in a full outer electron shell. The outermost energy level of noble gases is completely filled with electrons, making them highly stable and unreactive.

However, Kr and Xe, which belong to Group 18, have selected oxidation states other than zero. This indicates that they can form compounds and exhibit some degree of chemical reactivity. While noble gases are generally chemically inert, under certain conditions, Kr and Xe can react with highly electronegative elements, such as fluorine and oxygen, to form compounds.

These compounds are typically unstable and require specific conditions to form. The fact that Kr and Xe can exhibit oxidation states other than zero suggests that they have the ability to participate in chemical reactions, albeit to a limited extent compared to other elements.

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Group 18 constituents By choosing oxidation levels other than zero, Kr and Xe have demonstrated some degree of chemical reactivity.

Thus, Noble gases, commonly referred to as group 18 elements, are distinguished by their low reactivity.

They have stable electron configurations that result in a full outer electron shell, which explains this. Noble gases are extremely stable and inert because their outermost energy level is entirely made up of electrons.

However, Group 18 members Kr and Xe have chosen oxidation states other than zero. This suggests that they are chemically reactive and can combine to produce compounds.

Thus, Group 18 constituents By choosing oxidation levels other than zero, Kr and Xe have demonstrated some degree of chemical reactivity.

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