What type of heat transfer happens in the Outer Core?

Answer:

Digesting a sandwich because it cant be reversed.

Answer:

Boiling water

Explanation:

The water evaporates from the pot

Answer:

Answer:

The amount of energy absorbed when 10 g water at 86 C turns completely to steam vapor at 100 C is 584.76 J

The amount of energy released when 10 g water at 72 C freezes completely at 0 C is 3,012.48 J

Explanation:

Sensible heat is the amount of heat that a body can receive without affecting its molecular structure. If the molecular structure does not change, the state (solid, liquid, gas) does not change. Since the molecular structure does not change, a change in temperature is observed.

In other words, the heat that produces a change in the temperature of a substance without any changes in its physical state (phase change) is called sensible heat.

The equation that allows calculating this type of heat exchange is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the change in temperature.

1. In this case, you know:

Replacing:

Q= 4.184 [tex]\frac{J}{C*g}[/tex] *10 g*14 C

Solving:

Q= 584.76 J

The amount of energy absorbed when 10 g water at 86 C turns completely to steam vapor at 100 C is 584.76 J

2. In this case, you know:

Replacing:

Q= 4.184 [tex]\frac{J}{C*g}[/tex] *10 g*(-72) C

Solving:

Q= -3,012.48 J

The amount of energy released when 10 g water at 72 C freezes completely at 0 C is 3,012.48 J

Answer:

Os

Explanation:

Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, the correct option is option A.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.

Among all the given options, uranium (U) is an inner transition metal. Inner transition metal are the metals that belongs to f block of periodic table as their last electron goes into f subshell.

Therefore, the correct option is option A.

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Answer:

Ionic compounds are named with the cation first and the anion last. The same convention is used when writing their chemical formulas.

Explanation:

Answer:

.9375 x 10⁻³ moles .

Explanation:

2.5 mEq / L of Magnesium ion

2.5 x 10⁻³ Eq / L

= 2.5 x 10⁻³ / 2 mole / L    [  1 mole = 2 Eq ]

= 1.25 x 10⁻³ mole / L

1 L contains 1.25 x 10⁻³ mole

750 mL = .75 x 1.25 x 10⁻³ mole

= .9375 x 10⁻³ mole .

So 750 mL contains .9375 x 10⁻³ moles .

The speed of a wave can be calculated using this formula:

v = f x λ

Where:

v is the wave speed in metres per second, m/s

f is the frequency in hertz, Hz

λ (lambda) is the wavelength in metres, m

Calculation:

Given:

f = 20 Hz

λ = 100m

Using the equation:

v = f x λ

v = 20 x 100

v = 2000 m/s

Therfore, the speed of the wave is 2000 m/s

A sound wave has a wavelength of 100 m and a frequency of 20 Hz. The wave's speed is 2× 10^3 m/s.

assuming frequency = 20 Hz and wavelength = 100 m

utilized concept: v= = 20×100 = 2×10³ m/s

The frequency in physics is the quantity of waves passing a fixed location in a unit of time. It also indicates how many cycles or vibrations a body in periodic motion experiences in a given unit of time.

A sort of energy created by vibrations is sound. The molecules of the air surrounding an item vibrate as a result.. These molecules vibrate because they collide with nearby molecules, which also vibrate as a result.

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Answer:

A force is described as any influence that causes an object to undergo a change. Distance refers to how far an object travels over a period of time. The greater the force that is applied on an object the further distance that object will travel.

Answer:

the answer is B

Explanation:

because its asking you the frequent summertime storms

hope it helps you

Answer:

b is your answer i'm sure of it :)

Explanation:

have great day :)

Answer:

ORANGE WAIT NO IM COLOR BLIND

Explanation:

Answer: ik im late but I got b

Explanation:

A homogeneous mixture can be described as the solute uniformly dissolving in a solvent to make a solution. Therefore, option (B) is correct.

A mixture can be described as a combination of two or more substances that are not chemically combined with each other. Mixtures can be categorized into two kinds homogeneous mixtures and heterogeneous mixtures.

A homogeneous mixture can be defined as one whose whole composition is uniform throughout the entire mixture. It can be the type of mixture where the entire composition is constant throughout that make up the mixture and is distributed uniformly.

A homogeneous mixture can be described as a gaseous, liquid, or solid mixture that has equal proportions of its components throughout the sample. In a homogeneous mixture, there is only one phase of matter observed.

Some examples of Homogeneous Mixtures are Air Rainwater, Vinegar, Dishwashing detergent, Steel, Sugar water, a Cup of Coffee, etc.

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Answer:

C. 5 grams

Explanation:

The ratio is 2:1, which means everything on the right (B) will be half of the left (A). Since 10 is on the left, and half of 10 is 5, C is the answer

Answer:

Explanation:

Beta radiations:

mass 1/200 , charge -1, medium penetration

Beta radiations are result from the beta decay in which electron is ejected.

The mass of beta particle is smaller than the alpha particles.

They can travel in air in few meter distance.

These radiations can penetrate into the human skin.

The sheet of aluminum is used to block the beta radiation

Properties of alpha radiation:

mass 4 amu, charge +2, least penetration

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom the starting atom.

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

Gamma radiations:

mass 0, charge 0, deepest penetration

Gamma radiations are high energy radiations having no mass.

These radiations are travel at the speed of light.

Gamma radiations can penetrate into the many materials.

These radiations are also used to treat the cancer.

Lead is used for the protection  against gamma radiations because of its high molecular density.

The lead apron are used by the person when treated with gamma radiations.

Answer:

attached below is the detailed solution

answer : value of constant = 2.18 * 10^-18 J

Explanation:

Express the constant in terms of h and c and RH

attached below is the detailed solution

Constant = [tex]h_{C} R_{H}[/tex]

               = ( 6.626 * 10^-34 ) * ( 3 * 10^8 ) * ( 1.097 * 10^7 )

               = 2.18 * 10^-18 J

The Planck equation and the light speed  allow us to find the results for the transformation of the Rydberg equation are:

   [tex]E = A ( \frac{1}{n_1^2}\frac{x}{y} - \frac{1}{n_2^2} )\\A= R_H \ h \ c \\A = 2.18 \ 10^{-18} j[/tex]

The Rydberg equation is an empirical expression that explains the wavelength of the emissions.

          [tex]\frac{1}{\lambda } = R_H ( \frac{1}{n_1^2} - \frac{1}{n_2^2} )[/tex]  

Where λ is the wavelength of the emitted radiation, is the Rydberg constant, n₁ and n₂ are integers with n₁ <n₂

It is asked to write the Rydberg equation  for the energy.

Let's use the Planck relation.

           E = h f

The light speed is related to the wavelength and frequency of radiation.

           c = λ f

Where E is the energy, h the Planck constant, c the speed of light, λ the wavelength and f the frequency.

Let's  substitute.

           E = [tex]\frac{hc}{\lambda}[/tex]  

           [tex]\frac{1}{\lambda} = \frac{E}{hc}[/tex]  

Let's substitute in the Rydberg equation.

          [tex]\frac{E}{hc} = R_H ( \frac{1}{n_1^2} - \frac{1}{n_2^2}) \\E = R_H \ h \ c \ ( \frac{1}{n_1^2} - \frac{1}{n_2^2} )[/tex]

We can write is an constant of the form.

          A = [tex]R_H h c[/tex]

The value of the constant is :          

          A = 1,097 10⁷ 6,626 10⁻³⁴ 3 10⁸

          A = 2.18 10⁻¹⁸ J

In conclusion, using the Planck equation and the light speed we can find the results for the transformation of the Rydberg equation are

        [tex]E = A ( \frac{1}{n_1^2} - \frac{1}{n_2^2} )\\ A = R_H h c\\[/tex]

       A = 2.18 10⁻¹⁸ J

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Answer: I looked at the periodic table and the element that lines up between the two is F which is Fluorine.

Explanation: I hope this helps!

The element in period 2 of group 17 is fluorine.

Fluorine is the most chemically reactive and electronegative of all the elements. It is a single-valent toxic gaseous halogen that is pale yellow-green in color. Even with the noble gases krypton, xenon, and radon, fluorine easily combines with the majority of other elements to generate new compounds.

Glass, metals, and even water, as well as other materials, burn with a brilliant flame in a jet of fluorine gas because it is so reactive. The fluoride ion F- is the most frequent form of fluorine in aqueous solutions. Fluorides are substances that contain fluoride along with a positively charged partner.

Fluorine is indirectly utilized in the manufacturing of uranium, low friction polymers like teflon, and halons like freon. Fluorochlorohydrocarbons are widely utilized in refrigeration and air conditioning.

Therefore, the name of the element is fluorine.

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Answer:

awsdxcvawsd

Explanation:

Answer:If you change the number of neutrons in an atom, you get an isotope of the same element. The addition of a neutron can make an atom radioactive. When you change the number of protons in an atom, you will change the atom from one element to a different element.

Explanation:

Answer:

you need to put a choice if you want help add the possible answers

Explanation:

Answer:

3

Explanation:

Step 1: RxN

Rb + P → Rb₃P

Step 2: Balance RxN

We will need 3 Rb's on both sides.

3Rb + P → Rb₃P

Answer:

In 2H2SO4, the number of hydrogen atoms is (1,2,4,8) the number of sulfur atoms is (1,2,4,8) and the number of oxygen atoms is (1,2,4,8)

Explanation:

I've done this problem before, but I did it a month or so back so I'm not 100% sure but I'm pretty sure this is the correct answer. Hope this helps!

Answer:2 hydrogen atoms 1 sulfur atom 4 oxygen atom

hope I helped!

Answer:

What's the problem???

Answer:

Between oxygen and selenium, oxygen is more electronegative because of more ionisation energy and small size

Explanation:

Answer:

The answer is the second picture.

Explanation:

When you perceive a sound lower than its actual pitch, then you must have been further from the actual position.

The pitch of a sound is a perceptual property of sounds that allows sound of similar frequencies to be distinguished.

Pitch is the quality of sound, that makes it possible to judge sounds as "higher" and "lower" in the sense associated with musical notes.

Thus, when you perceive a sound lower than its actual pitch, then you must have been further from the actual position.

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The speed of the yacht : 100 km/h

Linear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration  

the speed of vo = v = constant

acceleration = a = 0  

Δx = vt or x = xo + vt  

An equation of constant velocity motion  

[tex]\large {\boxed {\bold {x = v \times \: t}}}[/tex]

x = distance = m  

v = speed = m / s  

t = time = seconds  

A yacht sailed at a steady speed for 0.5 hours, and traveled 50 kilometers

so the velocity/speed:

[tex]\tt v=\dfrac{x}{t}\\\\v=\dfrac{50~km}{0.5~h}=\boxed{\bold{100~km/h}}[/tex]

Distinguishing Between Pure Substances and Mixtures

Pure substances can be either elements or compounds. Mixtures can be either homogeneous or heterogeneous. ... Gasoline is thus a blend of different compounds, so it is a mixture.

Answer:

Explanation:The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century. It involves careful observation, applying rigorous skepticism about what is observed, given that cognitive assumptions can distort how one interprets the observation. It involves formulating hypotheses, via induction, based on such observations; experimental and measurement-based testing of deductions drawn from the hypotheses; and refinement (or elimination) of the hypotheses based on the experimental findings. These are principles of the scientific method, as distinguished from a definitive series of steps applicable to all scientific enterprises.[1][2][3]

Though diverse models for the scientific method are available, there is in general a continuous process that includes observations about the natural world. People are naturally inquisitive, so they often come up with questions about things they see or hear, and they often develop ideas or hypotheses about why things are the way they are. The best hypotheses lead to predictions that can be tested in various ways. The most conclusive testing of hypotheses comes from reasoning based on carefully controlled experimental data. Depending on how well additional tests match the predictions, the original hypothesis may require refinement, alteration, expansion or even rejection. If a particular hypothesis becomes very well supported, a general theory may be develope

Answer: The first picture

Explanation:

The structure of hydronium ion is correctly represented in  the first structure where there are three hydrogen atoms and one oxygen atom.

An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each other resulting in the formation of ionic bond.

Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.

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Answer:

No

Explanation:

Fortunately, in this scenario, you are not out of luck. Each of these components has a unique trait that would allow you to easily separate them. For starters, you can separate all of the Iron with a strong magnet since iron has a magnetic field while sand and salt do not. Next, you can separate the salt and sand by adding water since salt will dissolve in the water leaving only the sand which is not soluble. Once the sand is removed you would simply need to distill the water/salt mixture which would separate the salt from the water. Now you have all three components separated and can get your wish.

Answer:

sodium

Explanation:

Chopping a piece of wood

Physical changes are changes affecting the form of a chemical substance but not it's chemical composition.

Answer:

rusting nail: Rusting would only be a physical change if iron molecules remained pure iron throughout the process. Yeah your correct a physical change is anything seen or felt like changing the temperature of water a chemical change can also be seen also like if a iron nail rusts the nails iron atoms were chemically changed by oxygen.

lighting a match: Breaking a match in two pieces is an example of a physical change. Lighting a match and letting is burn is an example of a chemical change. Chemical reactions cause chemical changes. In a chemical reaction two or more substances, called the reactants, form different substances called products.

burning a piece of paper: Burning of paper is not a physical change. It is chemical change as ash is formed in the process which is new compound and oxides of carbon are also released during the process. By the definition of chemical change, we come to know that during chemical change a new substance must form. These changes are irreversible in nature.

chopping a piece of wood: The chopping of wood is a physical change because as stated previously, any physical change can include cutting, bending, sharpening, etc. When a piece of wood is being cut, it undergoes one of these processes. The chopping of wood doesn't alter the chemical structure of the actual wood.

So Its chopping piece of wood!

Answer:7

Explanation:

Answer:

its c

Explanation: