how much energy is required to heat a chunk of ice that weighs 510g from -256°c to 195°c

B. Helium

It has only He atoms

You can find the number of neutrons in an atom by subtracting the atomic number from the mass number.

The mass number of an atom is the total number of protons and neutrons in the nucleus of the atom. The atomic number of an atom is the number of protons in the nucleus of the atom. Both the mass number and the atomic number can be found on the periodic table of elements.

To find the number of neutrons in an atom therefore, you can use the following formula:

Number of neutrons = Mass number - Atomic number

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Answer:

for table C

Explanation:

What is the concentration of H+ ions at a pH = 11?

1.  ⇒ 0.00000000001 mol/L  

What is the concentration of H+ ions at a pH = 6?

2.  ⇒ 0.000001 mol/L  

How many fewer H+ ions are there in a solution at a

pH = 11 than in a solution at a pH = 6?

3.  ⇒ 100,000

The concentration of H+ ions at pH 11 is 1.0 x 10^-11 mol/L and at pH 6 is 1.0 x 10^-6 mol/L. There are 100,000 times fewer H+ ions at a pH of 11 than at a pH of 6.

The concentration of H+ ions in a solution can be calculated using the pH value, which is the negative logarithm (base 10) of the hydrogen ion concentration. Therefore, pH = -log[H+], and to find [H+], we can use the inverse logarithmic relationship: [H+] = 10^-pH.

For a solution with a pH of 11, the concentration of H+ ions would be: [H+] = 10^-11 mol/L, which equals 1.0 x 10^-11 mol/L.

For a solution with a pH of 6, the concentration of H+ ions would be: [H+] = 10^-6 mol/L, which equals 1.0 x 10^-6 mol/L.

To find how many fewer H+ ions are in a solution with a pH of 11 compared to a pH of 6, we divide the two concentrations: (1.0 x 10^-11 mol/L) / (1.0 x 10^-6 mol/L) = 1.0 x 10^-5. This means that the solution with a pH of 11 has 100,000 times fewer H+ ions than the solution with a pH of 6.

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The answer is:

D.[tex]C_{4}H_{4}S[/tex]

The empirical formula of a compound is the simplest formula of the same compound, if we are given the molecular formula, we can calculate the empirical formula by finding the mole ratio of each element of the compound.

So, if we know the empirical formula we will be able to get the molecular formula by multiplying it by the mole ratio.

Then, which of the options can give as a result the given molecular formula?

The answer will be D.[tex]C_{4}H_{4}S[/tex] because if we multiply it by 2(mole ratio), it will give us as a result : [tex]C_{8}H_{8}S_{2}[/tex]

[tex]2*(C_{4}H_{4}S)=C_{8}H_{8}S_{2}[/tex]

Have a nice day!

Similar chemical properties

(OPTION C)

Answer:

similar chemical properties

Explanation:

i can confirm his answer

Concentration Definition. In chemistry, concentration refers to the amount of a substance per defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration usually is expressed in terms of mass per unit volume.

Answer:

Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. This extra carbon dioxide is lowering the ocean's pH, through a process called ocean acidification.

Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone.

The flow of carbon on earth in its elemental and mixed phases is represented by the carbon cycle. The elemental kinds of carbon are diamond and graphite, and when they are mixed, they are found as carbonates throughout minerals as well as carbon dioxide gases throughout the atmosphere. Carbon is returned to the atmosphere as plants and animals perish and are degraded.

Plants use carbon from the atmosphere to produce photosynthesis. Animals eat these plants, which causes carbon to bioaccumulate in their bodies. Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone. The carbon cycle is greatly impacted by human activity.

Therefore, significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone.

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Specific Heat is the measure that how quickly or slowly a substance heats or cools.

Specific Heat is defined as the amount of required to raise the temperature of a substance by 1 degree Celsius.

The units of specific heat are usually calories or joules per gram per Celsius degree.

Specific Heat for water is 1 cal/gm /degree Celsius

Specific Heat is the measure that how quickly or slowly a substance heats or cools.

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Ask more questions based on learning something from this experiment.

hope this helps :)

Answer:

480.40 g.

Explanation:

2 SO₂(g) + O₂(g) → 2 SO₃(g),

it is clear that 2.0 moles of SO₂ react with 1.0 mole of oxygen to produce 2.0 moles of SO₃.

∵ 2.0 moles of SO₂ produce → 2.0 moles of SO₃, from the stichiometry.

∴ 6.0 moles of SO₂ produce → 6.0 moles of SO₃.

mass =  no. of moles x molar mass of SO₃ = (6.0 moles)(80.066 g/mol) = 480.396 g ≅ 480.40 g.

Answer:

The concentration of [tex]H^+[/tex] ions in the solution is [tex]1.778\times 10^{-4} M[/tex].

Explanation:

The pH of the solution is defined as negative logarithm of [tex]H^+[/tex] ion concentration.

[tex]pH=-\log[H^+][/tex]

The pH of the nitric acid solution = 3.75

[tex]3.75=-\log[H^+][/tex]

[tex][H^+]=Antilog [-3.75]=0.0001778=1.778\times 10^{-4} M[/tex]

The concentration of [tex]H^+[/tex] ions in the solution is [tex]1.778\times 10^{-4} M[/tex].

Answer:

1st Question: 1.78 / -4

2nd Question: A

Explanation:

Source: Dude trust me

A is the answer i dont really know but i think is right

Answer : The correct option is, (A) Pressure is directly proportional to density.

Explanation :

Density : It is defined as the mass contained per unit volume.

Formula used for density :

[tex]Density=\frac{Mass}{Volume}[/tex]

From this we conclude that, the density depends on mass and volume of substance.

The density is directly proportional to the mass of substance and inversely proportional to the volume of substance.

[tex]Density\propto \frac{1}{Volume}[/tex]

And as we know that, the volume is also depends on pressure and temperature. That means,

Volume is directly proportional to the temperature and inversely proportional to the pressure.

[tex]Volume\propto Temperature\\\\Volume\propto \frac{1}{Pressure}[/tex]

From this we conclude that,

The relation between the density, volume and pressure is:

[tex]Density\propto \frac{1}{Volume}\propto Pressure[/tex]

The relation between the density, volume and temperature is:

[tex]Density\propto \frac{1}{Volume}\propto \frac{1}{Temperature}[/tex]

From the given option, only option A is correct option. While the other options are incorrect.

Hence, the correct option is A.

I’m not sure exactly what question you’re trying to ask, but I’ll give two answers:

1. The mass is reported as 35.5 amu because atomic weights are reported based on the weights and abundances of the isotopes of that element. For example, Hydrogen (which is typically understood to have only one proton, aka 1 amu) has a weight of 1.004 amu. This is because heavier isotopes of this element do exist but in very small quantities; however, they can still influence the “averaged” weight.

2. The weight of an atom is intrinsic based on its makeup - the number of each component influence the overall weight of the atom. In this case, Chlorine is comprised of the right number of protons and neutrons in the right occurrence and organization such that a weight of 35.5 amu is reported.

Hope this helps!

I would say the answer is A.

Answer:

2.138 I think

Explanation:

N2 + 3H2 -> 2NH3

This means that 3 moles of H2 gives 2 moles of NH3

Lets convert 12.12 g of NH3 into moles.

The molecular weight of NH3 is 17 g/mol

So 12.12 g is 0.713 moles

If 2 NH3 comes from 3 moles of H2

1 mole comes from 1.5 moles of H2

So 0.713 moles of NH3 comes from 1.5 x 0.713 moles of H2 =1.069 moles of H2

1 mole of H2 weights 2g

So 1.069 moles of H2 weighs 2.138 g

Answer:

Explanation:

I think its B...

the rotational motion of the Earth and its iron core-

Final answer:

The Earth's magnetic field is created by the motion of the Earth's liquid iron outer core, driven by thermal and compositional currents, and the rotational motion of the Earth. This generates electrical currents that are responsible for the magnetic field, making answer D. the rotational motion of the Earth and its iron core the correct one.

Explanation:

Earth's magnetic field is primarily generated by the convective movements of molten metal within its outer core. This movement, coupled with the Earth's rotation, produces electrical currents that generate the magnetic field. These currents of liquid iron create dynamic magnetic fields through a self-sustaining process involving Ampère's law and Faraday's law, which describe the interplay between electric currents and magnetic fields.

This activity in the Earth's outer core is what results in the geomagnetic field that extends far into space, providing a shield against harmful radiation from the sun, including plasma from the solar wind, and contributing to phenomena like the Aurora Borealis.

Therefore, the correct answer is D. the rotational motion of the Earth and its iron core.

The fraction is calculated like this:

[tex] \frac{1}{ {2}^{50 \div 10} } = \frac{1}{32} [/tex]

If you want an universal equation for all problems like this:

[tex] \frac{1}{ {2}^{time \div halflife} } [/tex]

The fraction of the original mass of the radioactive isotope with a half-life of 10 years that will remain after 50 years is 1/32.

We can find the fraction of the original mass with the exponential decay equation:

[tex] N(t) = N_{0}e^{-\lambda t} [/tex]  (1)

Where:

N(t): is the amount of radioactive isotope at time t

N₀: is the initial amount of radioactive isotope

λ: is the decay constant

t: is the time = 50 y

We can find the decay constant as follows:

[tex] \lambda = \frac{ln(2)}{t_{1/2}} [/tex]   (2)

Where:

[tex]t_{1/2}[/tex]: is the half-life of the isotope = 10 y

The decay constant is (eq 2):

[tex] \lambda = \frac{ln(2)}{t_{1/2}} = \frac{ln(2)}{10 y} = 0.069 y^{-1} [/tex]

Now, the fraction of the original amount is (eq 1):

[tex] \frac{N(t)}{N_{0}} = e^{-\lambda t} = e^{-0.069 y^{-1}*50 y} = 0.0317 [/tex]

Since we need to calculate the fraction of the original mass, after some algebraic operations we have:

[tex] \frac{N_{0}}{N(t)} = 32 [/tex]  

[tex] N(t) = \frac{1}{32}N_{0} [/tex]                          

Therefore, the fraction of the original mass that will remain is 1/32.

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I hope it helps you!  

As he began to teach inorganic chemistry, Mendeleev could not find a textbook that met his needs. Since he had already published a textbook on organic chemistry in 1861 that had been awarded the prestigious Demidov Prize, he set out to write another one. The result was Osnovy khimii (1868–71; The Principles of Chemistry), which became a classic, running through many editions and many translations. When Mendeleev began to compose the chapter on the halogen elements (chlorine and its analogs) at the end of the first volume, he compared the properties of this group of elements to those of the group of alkali metals such as sodium. Within these two groups of dissimilar elements, he discovered similarities in the progression of atomic weights, and he wondered if other groups of elements exhibited similar properties. After studying the alkaline earths, Mendeleev established that the order of atomic weights could be used not only to arrange the elements within each group but also to arrange the groups themselves. Thus, in his effort to make sense of the extensive knowledge that already existed of the chemical and physical properties of the chemical elements and their compounds, Mendeleev discovered the periodic law.

Dimitri Mendeleev was the most noted Russian chemist who gave the periodic table. He gave the periodic table based on the atomic numbers and how they characterized the physical and chemical properties of the elements.

Therefore, he discovered the periodic table.

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Answer:

Terrae  

Explanation:

The mountainous parts of the moon are referred as Terrae. These are bright regions on the moon. Most of the surface of the moon is covered these highlands.

Craters are the depressions created on the surface of the moon as the space rocks strike.

Maria are the dark areas on the surface of the moon. These areas are filled with solidified lava.

Regolith constitutes the upper loose layer of soil, dust, broken rocks and other materials.

I do believe the answer is A. Hope this helps.

I think A would be the correct answer

Fire is burning, which is combustion, and combustion is a type of oxidation reaction. Oxidation means combined chemically with oxygen . Oxidation is an exothermic reaction, meaning it gives releases heat energy.

for a is burning. which is combustion and that is a type of oxidation means to combine chemically with oxygen.

cations are formed when a metal loses electrons, and a nonmetal gains those electrons.

That would be vegetables rotting and boiling an egg. . The others are physical changes.

B solids made of atoms

Solids with the highest melting points are typically those with either covalent networks or ionic bonds, due to the strength of their atomic or ionic interactions.  So the correct option is C.

The type of solid that often has the highest melting points are those made of atoms arranged in a covalent network or those formed by ionic bonds. Solids that consist of ionic bonds, such as sodium chloride (NaCl), typically have high melting points due to the strong electrostatic interactions between the positively and negatively charged ions within a crystal lattice. Similarly, materials with a covalent network, like diamond or silicon dioxide (SiO2), have very high melting points because they consist of a three-dimensional array of covalently bonded atoms that require a lot of energy to break apart. In contrast, molecular solids composed of nonpolar or polar molecules have lower melting points due to their weaker intermolecular forces, such as London dispersion forces, dipole-dipole interactions, and in some cases, hydrogen bonding.

What is it that you’re asking for?

Answer:

Where is the chart

Explanation:

Answer:

right - towards the products.

Explanation:

By removing oxygen from the reaction, this means that the concentration of the products is decreased.

To attain the equilibrium again, the reaction is shifted toward the products side.

So, the right choice is: right - towards the products.

answer is one first one for one electron.