What is the atomic number of silicon​

The given compounds are Enantiomers

Enantiomers are the chemicals that make up the given pair. One of the two stereoisomers is a mirror image of the other but cannot be superposed, much as how one's left and right hands are mirror images of one another but cannot appear identical only by being reoriented. When a chemical has a single chiral atom or another comparable structural feature, it can have two possible structures that are non-superposable and mirror images of one another.

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Answer:

37.9g of carbon 14 remains

Explanation:

The radioactive decay of an atom follows the equation:

Ln[A] = -kt + Ln[A]₀

Where [A] is amount of isotope after time t, k is decay constant and [A]₀ initial amount of the isotope.

We can find k from half-life using:

k = ln 2 / Half-Life

k = ln 2 / 5730 years

k = 1.2097x10⁻⁴ yrs⁻¹

Replacing in the equation all values:

Ln[A] = -1.2097x10⁻⁴ yrs⁻¹*2292yrs + Ln[50g]

Ln[A] = 3.635

[A] = 37.9g of carbon 14 remains

Step 1

The reaction:

1 Sn(HCO3)2 + 1 Ag2Cr2O7 => 1 SnCr207 + 2 AgHCO3 (completed and balanced)

-----------------

Step 2

Information provided:

167 g of Tin (Il) hydrogen carbonate, Sn(HCO3)2 => the limiting reactant

The excess = Ag2Cr2O7

-----

Information needed:

The molar mass of Sn(HCO3)2 = 240.7 g/mol (use your periodic table please)

---------------

Step 3

By stoichiometry,

1 mol Sn(HCO3)2 = 240.7 g

Procedure:

1 Sn(HCO3)2 + 1 Ag2Cr2O7 => 1 SnCr207 + 2 AgHCO3

240.7 g Sn(HCO3)2 ---------- 2 x 1 mole AgHCO3

167 g Sn(HCO3)2 ---------- X

X = 167 g Sn(HCO3)2 x 2 x 1 mole AgHCO3/240.7 g Sn(HCO3)2

X = 1.39 moles

Answer: 1.39 moles AgHCO3 are produced

The final temperature of the water is 29 degrees.

What is heat energy?

The results of the movement of minute particles known as atoms, molecules, or ions in liquids, solids, and gases are nothing but heat.  heat can be transferred from one substance to another and the flow because of the temperature difference between two objects is known as heat.

It is given that,

Mass of sample of water, m = 52 grams

Initial temperature, Ti = 10 degree

Heat absorbed, Q = 4,130 J

The specific heat of water is 4.184 J/(g C)

So,  the ultimate temperature of the water is 28.98-degrees.

The option C is correct.

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Answer:

Mgl2 is your answer. Can I get brainliest

Answer:

Granite, diorite Gabbro, and peggmatite are example of ectrusive igneous rocks.

Examples of extrusive igneous rocks are Pegmatite, Diorite, Granite, and Gabbro. The correct options are B, C, E and F.

Igneous rocks are the rocks formed when the hot lava or magma cools down and becomes brittle. These rocks are formed in the place where volcanic eruption occurs. The two types of igneous rocks are intrusive and extrusive igneous rocks.

The extrusive igneous rocks are formed when the hot lava cools down above or near the surface of the earth.

Thus, the correct option correct options are B, Pegmatite, C, Diorite, E Granite, and F Gabbro regarding extrusive igneous rocks.

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Answer:

150

Explanation:

i think that was the answer

Answer: it is Not a pure substance because it consists of sodium so it would be a mixture because it contains sodium

Explanation:

plz mark brainliest

its mixture

Explanation:

phosphorus atoms has 15 electrons and 15 protons with valence 5 electron in outer shell and is highly reactive element

Answer:

i wish i know

Explanation:

To determine the number of moles of gas given its pressure, volume, and temperature, we can use the ideal gas law equation. The number of moles of gas is approximately 2.226 moles.

The ideal gas law equation, PV = nRT, relates the pressure (P), volume (V), number of moles (n), gas constant (R), and temperature (T) of a gas. In this case, we have the values of pressure (2.3 atm), volume (29 liters), and temperature (360 K), and we need to find the number of moles (n) of gas. Rearranging the equation to solve for n, we have n = PV / RT.

Plugging in the given values, we get n = (2.3 atm * 29 L) / (0.082057 L·atm/(mol·K) * 360 K). Simplifying the expression, we find that the number of moles of gas is approximately 2.226 moles.

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Answer:

the outcome of something

We are given:

Volume of gas = 3.8 L

Pressure = 460 mmHg

Temperature = 77°c = (77+273)K = 350K

Converting the pressure to atm:

Pressure(in atm)  = Pressure(in mmHg) / 760

Pressure = 460/760 = 0.6 atm

Finding the number of moles:

using the ideal gas equation:

PV = nRT                                         [where R is the universal gas constant]

replacing the given values in this equation

(0.6)(3.8) = n(0.082)(350)

n = (0.6*3.8)/(0.082*350)

n = 0.08 moles

Answer:

True. If they're talking about the first orbital around the nucleus then yes, its true. The element will be unstable and die

Explanation:

Answer:

Water molecules' adhesion aids plants in moisture absorption at their roots. Water's initial boiling point is attributed to cohesion, which helps animals regulate their body temperature.

Explanation:

Answer: they all are 4 properties of matter

Answer:

Explanation:

Mass is a scalar quantity. It has magnitude. In science, volume is a measure of the amount of three-dimensional space an object fills. It’s usually measured in cubic meters based on the SI or metric system. Volume can be represented by three axes – length, width, and height. In practice, however, volume in chemistry is commonly measured in liters and milliliters.  Magnetism is a force that attracts (pulls closer) or repels (pushes away) objects that have a magnetic material like iron inside them (magnetic objects). In simpler words, it is a property of substances which pull closer or repel other objects. It is a subject in physics.  The melting point of a substance is the temperature at which it changes state from solid to liquid.

Answer

                    Explanation:O2 = 1.7×10-3M;

N2 = 6.4×10-3M;

NO = 1.1 10-5M.

Cl2 + 2NaBr 2NaCl + Br2 was the equation that is suitable for oxidizing agent.

what is an oxidizing agent ?

An oxidising agent (also known as an oxidant, oxidizer, electron recipient, or electron acceptor) is a substance that obtains or "accepts"/"receives" an electron from a reducing agent in a redox chemical process (called the reductant, reducer, or electron donor). An oxidizer, in other terms, is any substance that oxidises another material. The oxidizer's oxidation state, which specifies the degree of electron loss, falls while the reductant's oxidation state increases; this is described by stating that oxidizers "undergo reduction" and "are reduced," whereas reducers "undergo oxidation" and "are oxidised." Oxygen, hydrogen peroxide, and halogens are common oxidising agents.

An oxidising agent is a chemical species that conducts a chemical reaction in which one or more electrons are gained.

Cl2 + 2NaBr 2NaCl + Br2 was the equation.

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Photosystem pigments that function in gathering and passing light to reaction-center molecules are called antenna pigments.

These pigments are located in the antenna complex of photosystems I and II and are responsible for absorbing light energy and transferring it to the reaction center chlorophyll molecules.

Antenna pigments are diverse and include chlorophylls, carotenoids, and phycobilins, each of which absorbs light at different wavelengths.

The absorbed light energy is then funneled through a series of pigment molecules until it reaches the reaction center, where it is converted into chemical energy through a process known as photosynthesis.

The efficiency of photosynthesis is dependent on the quantity and types of antenna pigments present in the photosystems, as well as their arrangement and orientation within the antenna complex.

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Seasons on the Earth can be defined as the period or time of year which is characterized by several factors like weather, and temperature occurring. The tilt of the Earth's axis causes the seasons.

Earth has four types of seasons namely - Summer season, Rainy season, Autumn season, and Winter season.

Summer season starts in the month of April and lasts till the month of June.  It is usually the hottest season out of all four seasons. The days are longer and the nights are shorter in this season.

The second season is the Rainy season which arrives in the month of June and last till the month of September. This season is the Wet season of the year because in rainy seasons there are rain showers all over. It is also known as the Monsoon season. As the monsoon arrives, there is relief from high daytime temperatures and night temperature also drops. Monsoons are important for vegetation to grow and also important for human beings.

The third season is the Autumn season which begins after the monsoon season and ends before the winter season. This is in the month of September till the end of October. The length of day and night are equal.

The last season on the Earth is the Winter season. This season occurs after the Autumn season and before the arrival of Spring. Winter is the coldest season of the year. The length of nights is longer than the length of days in the winter season.

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The electrophilic bromination or chlorination of benzene requires Lewis acid along with the halogen.

The bromination or chlorination of benzene is an example of an electrophilic aromatic substitution reaction.

During the reaction, the bromine forms a sigma bond to the benzene ring, yielding an intermediate. Subsequently a  a proton is removed from the intermediate to form a substituted benzene ring.

This reaction is achieved with the help of Lewis acid as catalysts.

Thus, the electrophilic bromination or chlorination of benzene requires Lewis acid along with the halogen.

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The mole fractions and mass fractions of each element in the alloy are: Mole fractions: Ni = 0.0896, Cr = 0.1366, O = 0.7738 Mass fractions: Ni = 21.25%, Cr = 28.75%, O = 50% Average molecular weight: 20.8 g/mol.

To calculate the mole fractions and mass fractions of each element in the alloy, we need to first determine the total number of moles of each element:

moles of Ni = 17 g / 58.69 g/mol = 0.290 mol

moles of Cr = 23 g / 51.99 g/mol = 0.442 mol

moles of O = 40 g / 15.99 g/mol = 2.501 mol

The total number of moles in the alloy is then:

total moles = 0.290 mol + 0.442 mol + 2.501 mol = 3.233 mol

The mole fractions of each element are then:

mole fraction of Ni = 0.290 mol / 3.233 mol = 0.0896

mole fraction of Cr = 0.442 mol / 3.233 mol = 0.1366

mole fraction of O = 2.501 mol / 3.233 mol = 0.7738

The mass fractions of each element can be calculated as follows:

mass fraction of Ni = (17 g / 80 g) x 100% = 21.25%

mass fraction of Cr = (23 g / 80 g) x 100% = 28.75%

mass fraction of O = (40 g / 80 g) x 100% = 50%

The average molecular weight of the alloy can be calculated using the formula:

average molecular weight = (mass of Ni + mass of Cr + mass of O) / total moles

The mass of each element can be calculated as follows:

mass of Ni = 0.290 mol x 58.69 g/mol = 17.0 g

mass of Cr = 0.442 mol x 51.99 g/mol = 23.0 g

mass of O = 2.501 mol x 15.99 g/mol = 40.0 g

Substituting these values into the formula, we get:

average molecular weight = (17.0 g + 23.0 g + 40.0 g) / 3.233 mol

average molecular weight = 20.8 g/mol.

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Answer:

Astatine: Halogen

Nitrogen: Non-Metal

Krypton: Non-Metal, Noble Gas

Chlorine: Non-Metal

Sulfur: Non-metal

Explanation:

There are 0.00244 moles of acetic acid present in the acetic acid/acetate buffer solution.

To determine the moles of acetic acid in the acetic acid/acetate buffer, you need to multiply the volume of acetic acid by its molarity. In this case, there are 0.00244 moles of acetic acid present in the buffer.

Here's a detailed explanation:

1. Given the volume of acetic acid is 30.5 mL and its molarity is 0.0800 M. To convert the volume to liters, divide the volume in milliliters by 1000:

  30.5 mL ÷ 1000 = 0.0305 L

2. To find the moles of acetic acid, multiply the volume in liters by its molarity:

  Moles of acetic acid = Volume (L) × Molarity (M)
  Moles of acetic acid = 0.0305 L × 0.0800 M
  Moles of acetic acid = 0.00244

Therefore, there are 0.00244 moles of acetic acid present in the acetic acid/acetate buffer.

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After opening to trade, a capital-abundant country will export the capital-intensive good and both the country and its trading partners will be better off. Capital-intensive goods refer to those products that require more investment in machines, equipment, and technology for their production.

Since a capital-abundant country has a relatively higher amount of capital, it can produce these goods more efficiently than labor-intensive products. By exporting capital-intensive goods, the country can earn higher profits and increase its overall economic growth. Furthermore, the exporting of capital-intensive goods can also lead to improved economic conditions for its trading partners. These partners can purchase these goods at a lower price, as the exporting country can produce them at a lower cost. The importing of these goods will lead to an increase in consumption, investment, and overall economic growth in the importing countries.

In conclusion, the opening to trade can benefit a capital-abundant country through the exporting of capital-intensive goods, which leads to increased profits and economic growth. It also benefits the importing countries through the increased availability of these goods at a lower cost, leading to improved economic conditions.

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According to the forces of attraction and phase diagram , water changes from solid to liquid to gas.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

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A formula that lists the relative amounts of the constituent components in a compound without specifying the number or configuration of atoms. The empirical formula is , thus option (d) is correct.

The formula that shows the ratio of elements present in the compound, but not the actual numbers of atoms found in the molecule. Empirical formula seems to be a compound chemical formula that only specifies the ratio of elements it contains, not the precise number as well as arrangements of atoms. This corresponds to compound elements with the smallest whole number ratio.

Empirical, molecular as well as structural formula are still the three basic category the easiest whole number ratio of a compound is shown by empirical formula. The number including each variety of atom in a molecule is shown by molecular formula, and the bonds between atoms in a molecule is shown by structural formula.

Thus, option (d) empirical formula  is  C₄H₂O₂ correct.

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I would expect a C24 molecule to boil at a higher temperature than a C8 molecule.

The boiling point of a molecule depends on the strength of intermolecular forces between the individual molecules. Intermolecular forces are forces that exist between molecules and they include dipole-dipole forces, hydrogen bonding, London dispersion forces, and ion-dipole forces.

This is because the boiling point of a molecule is directly related to its size and the strength of its intermolecular forces. A larger molecule such as C24 has more electrons and a larger surface area, which results in stronger intermolecular forces such as London dispersion forces.

These stronger forces require more energy to be overcome and thus result in a higher boiling point. In contrast, a smaller molecule such as C8 has weaker intermolecular forces and requires less energy to overcome them, resulting in a lower boiling point.

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The volume occupied by 0.101 mol of helium gas at a pressure of 0.91 atm and a temperature of 309 K can be calculated using the ideal gas law equation.

The volume can be determined by rearranging the ideal gas law equation, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Rearranging the equation to solve for V, we get V = (nRT)/P. Plugging in the given values, we have

V = (0.101 mol)(0.0821 L·atm/(mol·K))(309 K) / (0.91 atm).

By performing the calculation, the volume is found to be approximately 2.9 liters.

The calculation is based on the ideal gas law, which describes the behavior of ideal gases under certain conditions. In this case, the ideal gas law equation is used to find the volume of helium gas.

The equation relates the pressure, volume, temperature, and number of moles of a gas. By rearranging the equation and plugging in the given values, we can calculate the volume.

The volume is found to be 2.9 liters, indicating the amount of space occupied by 0.101 mol of helium gas at the given pressure and temperature.

It's important to note that this calculation assumes that helium behaves as an ideal gas, meaning that it follows the ideal gas law equation accurately under the given conditions.

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The atomic theory describes Dalton's theory because electron, proton and neutron.

The first a part of his theory states that every one matter is product of atoms, which might be indivisible. The second one part of the concept says all atoms of a given element are equal in mass and houses. The  element says compounds are combos of two or extra distinctive forms of atoms.

One of the maximum essential merits of Dalton's atomic idea is the truth that the idea does no longer violate numerous fundamental laws of chemical combination consisting of the regulation of precise proportions, the regulation of multiple proportions, and the regulation of conservation of mass.

In 1803 Dalton located that oxygen mixed with both one or  volumes of nitric oxide in closed vessels over water and this pioneering remark of fundamental more than one proportions supplied vital experimental proof for his incipient atomic thoughts.

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China has the highest per capita carbon emissions worldwide, at 35.6 metric tons per person. Numerous countries in the Middle East have high levels emissions, particularly when compared to countries in Africa.

The average Chinese person radiates quite a bit less than the average American. In 2019, China's per capita emissions reached 10.1 tons. By comparing, the US reached 17.6 tons, according to the Rhodium Group.

Most carbon emissions are due to the use of fossil fuels, mostly for generation of electricity and heat, transportation, and manufacturing. Land use and forestry is another reason of carbon emissions, mostly due to deforestation.

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