Are most snakes venomous or nonvenomous?

Answer:

A. Non-metal

B. Six

C. 2

D.NA2O

E.Oxygen

Explanation:

Oxygen is the element in the second period (second horizontal row) and Group VI A of the periodic table. These properties apply to oxygen

Answer:

26 protons..........

Explanation:

Here is why: If the atmosphere contains too much of these gases, the whole Earth becomes a hotter and hotter greenhouse. The atmosphere holds onto too much of the heat at night instead of letting it escape into space. Then, the next day, the Sun heats Earth's surface even more.

Answer:

1. Cl electron configuration: 1s^2 2s^2 2p^6 3s^2 3p^5

Ag electron configuration: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^9

2. It will be easier to remove beryllium's valence electrons. Beryllium has two valence electrons, while oxygen has six valence electrons. This means that oxygen has a greater attraction on its electrons because the protons and electrons are closer together. Moreover, during bonding, beryllium is more likely to form the cation Be^2+ and oxygen is more likely to form the anion O^2-. This shows that due to beryllium's weaker attraction, it is more likely to get its electrons taken away than oxygen is.

Explanation:

1. Complete each of the orbitals up to each of the desired elements. Look up a diagram showing the electron shells of the periodic table and count the electrons of each element to be able to solve any configuration problem.

Another way of writing the answer would be in noble gas configuration. This would change the answer to:

Cl: [Ne] 3s^2 3p^5

Ag: [Kr] 5s^2 4d^9

But both answers (the extended electron configuration and the noble gas configuration) mean the same thing.

Apply to a gas molecule's kinetic energy is not the same as telling you the speed, so calling a thermometer a speedometer for atoms is deceptive.

Uniformly, if a sample of water is put down in the freezer, its molecules begin to move slower (with a lower speed) and this is thought the back by a lower thermometer reading. It is in this feeling that a thermometer can be thought of as a speedometer. As John Rennie broaches in the comments, thermometers work for solids, liquids, and gasses, whereas the temperature is comparable to the average. A thermometer would be an average speedometer for the primary molecules of a substance or structure, not specifically separate atoms.

So we can conclude that thermometers compute the average velocity of atoms in a given material or order volume.

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Answer: Density is mass per unit volume. You have supplied both measurements, so simply take the quotient.

Explanation: Density, p,=37.72⋅g6.80⋅cm3=??g⋅cm−3

The sequence that carbon dioxide goes through to become stored in carbonate rocks on the ocean floor involves dissolution, dissociation, utilization by marine organisms, accumulation, and transformation through geological processes.

The sequence that carbon dioxide goes through to become stored in carbonate rocks that end up on the ocean floor can be summarized in the following steps:

1. Carbon dioxide (\(CO_{2}\)) dissolves in the ocean water, forming carbonic acid (\(H_{2}CO_{3}\)).
2. Carbonic acid then dissociates to form bicarbonate ions and hydrogen ions.
3. Bicarbonate ions in the ocean water can further dissociate to form carbonate ions and more hydrogen ions.
4. Marine organisms, such as corals, mollusks, and foraminifera, take up these carbonate ions and combine them with calcium ions present in the seawater to form calcium carbonate, which is the primary component of their shells or skeletons.
5. When these marine organisms die, their calcium carbonate shells or skeletons accumulate on the ocean floor and, over time, form layers.
6. Over millions of years, pressure and heat cause these layers of calcium carbonate shells or skeletons to compact and transform into carbonate rock, such as limestone or dolomite.

So, the sequence that carbon dioxide goes through to become stored in carbonate rocks on the ocean floor involves dissolution, dissociation, utilization by marine organisms, accumulation, and transformation through geological processes.

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1. HCl(aq) + KOH(aq) --> KCl(aq) + H₂O(l)

2. Fe(s) + CuSO₄(aq) --> FeSO₄(aq) + Cu(aq)

3. KBr --> K + Br

4. Cl₂ + 2Na --> 2NaCl

5. Al₂(SO₄)₃ + Ca₃(PO₄)₂ --> 2AlPO₄ + 3CaSO₄

6. 2NaI + Cl2 --> 2NaCl + I₂

7. 2C₄H₁₀ + 13O₂ --> 10H₂O + 8CO₂

Answer:

thx for giving points and in reaturn i won't answer qustion because i don't know the answer thx for th points agian

Explanation:

The missing word to fill in the blank is "XIIIa". Factor XIIIa, also known as fibrin stabilizing factor, is an enzyme that plays a critical role in the final stages of the blood coagulation cascade.

Once thrombin cleaves fibrinogen to form fibrin, factor XIIIa acts to cross-link the fibrin monomers into a stable fibrin polymer. This cross-linking of fibrin threads helps to strengthen and stabilize the blood clot, ensuring that it remains in place until the injured blood vessel can heal.

Factor XIIIa is activated from its precursor, factor XIII, by thrombin in the presence of calcium ions. Once activated, factor XIIIa catalyzes the formation of covalent bonds between lysine and glutamine residues in adjacent fibrin monomers, resulting in the formation of a stable fibrin polymer. Without factor XIIIa, the blood clot would be weaker and more susceptible to breakdown, which could result in severe bleeding and other complications.

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Among the options, the laboratory test that would support a diagnosis of congestive heart failure is B. Troponin.

Troponin is a cardiac biomarker that is released into the bloodstream when there is damage to the heart muscle. Elevated levels of troponin in the blood are indicative of myocardial injury or infarction, including heart failure.

Congestive heart failure (CHF) is a condition characterized by the heart's inability to pump blood effectively, leading to fluid accumulation and congestion in various parts of the body. While troponin levels are primarily associated with myocardial infarction (heart attack), they can also be elevated in certain cases of heart failure.

In congestive heart failure, the heart muscle may be stressed or damaged, which can cause the release of troponin into the bloodstream. Therefore, an elevated troponin level, along with other clinical findings and diagnostic tests, can support the diagnosis of congestive heart failure.

It's worth noting that other laboratory tests and diagnostic tools, such as imaging studies (e.g., echocardiogram) and assessment of other cardiac biomarkers (e.g., B-type natriuretic peptide, brain natriuretic peptide), are often used in conjunction with troponin levels to evaluate and diagnose congestive heart failure accurately. A comprehensive clinical evaluation by a healthcare professional is necessary to make an accurate diagnosis and develop an appropriate treatment plan.

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State the given:

Moles of Sulfur = 5 moles

Molar mass of Sulfur = 32.06g/mol

Look through the formulas:

Moles = Mass/Molar Mass

Rearrange the equation:

Mass = Moles x Molar mass

Plug in your given:

5 moles Sulfur   x   32.06g

                                 1 mol

= 160.3g of Sulfur

Solid contains particles that move slightly in a fixed position.

Solid is one of the four fundamental states of matter. The molecules or particles in a solid have a fixed position and cannot move around freely. The particles of a solid have the least amount of energy as compared to liquid and gas. Therefore, their movement is restricted to only a certain degree which gives a solid its distinct shape. They vibrate in place but do not move past one another, which is why the shape of the solid remains constant unless an external force is applied.

A solid can be crystalline or amorphous. Crystalline solids have a defined regular repeating pattern of atoms or molecules whereas amorphous solids do not have any fixed pattern of atoms. Examples of solids include ice, iron, wood, and plastic.

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The given statement "increasing the partial pressure of the gas will increases the amount of that gas, which will be dissolved in a fluid" is false. Because, the solubility of a gas in a fluid depends on factors such as temperature, pressure, and the nature of the specific gas and fluid.

According to Henry's Law, which applies to ideal gases, the solubility of a gas in a liquid is directly proportional to its partial pressure. So, in that case, increasing the partial pressure of a gas would increase its solubility in the fluid.

However, this relationship is valid only under certain conditions and for ideal gases. It does not hold true for all gases and fluids. The solubility of a gas in a liquid can be affected by factors such as the nature of the gas and liquid, temperature, presence of other solutes, and specific interactions between the gas and the fluid molecules.

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The theoretical yield of C₆H₅Cl if 91.2 g of C₆H₆ react in the reaction given is 131.287 g.

Theoretical yield is the amount of a product that results from the full conversion of the limiting reactant in a chemical reaction. You won't get the same quantity of product from a laboratory reaction as you would from a perfect (theoretical) chemical reaction. Grammes or moles are common units of measurement for theoretical yield.

The amount of product created by a reaction is known as the actual yield, as opposed to theoretical yield. Because of a later reaction producing additional product or because the recovered product contains impurities, an actual yield may be larger than a theoretical yield.

Write the balanced equation-

C₆H₆ + Cl2 ⇒ C₆H₅Cl + HCl

1 mol C₆H₆ reacts with 1 mole Cl₂ to yield 1 mole of C₆H₅Cl

Calculate the moles of each reactant-

91.2 g C₆H₆ / 78.1 g/mol = 1.167 mol C₆H₆

36.9 g Cl2 / 70.9 g/mol = 0.520 mol Cl₂

1.167 mole C₆H₆ requires 0.520 mole Cl₂. You have excess Cl₂ so C₆H₆ is limiting.

1.167 mole C₆H₆ will yiels (at 100%) 1.167 mole C₆H₅Cl

1.167 mol x 112.5 g/mol = 131.287 g C₆H₅Cl

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Answer:

The reaction of 112 cm³ of chlorine at STP with an excess of sodium can produce 0.292 grams of NaCl.

Explanation:

The reaction of chlorine with sodium can produce sodium chloride (NaCl), which is also known as table salt. To determine how many grams of NaCl can be produced by this reaction, we need to know the molar mass of NaCl and the number of moles of chlorine that are reacted.

The molar mass of NaCl is 58.44 g/mol. This means that 1 mole of NaCl has a mass of 58.44 grams.

To find the number of moles of chlorine that are reacted, we need to convert the volume of chlorine from cubic centimeters (cm³) to liters, and then use the ideal gas law to calculate the number of moles. At standard temperature and pressure (STP), 1 mole of any gas occupies a volume of 22.4 liters. Therefore, the number of moles of chlorine can be calculated as follows:

moles = (volume of chlorine at STP) / (volume of 1 mole of any gas at STP)

In this case, the volume of chlorine is 112 cm³, which is equivalent to 0.112 liters at STP. Therefore, the number of moles of chlorine can be calculated as follows:

moles = 0.112 liters / 22.4 liters/mol

This gives a result of 0.005 moles of chlorine.

Since the reaction produces an excess of sodium, we can assume that all of the chlorine that is reacted is converted into NaCl. Therefore, the mass of NaCl that is produced can be calculated by multiplying the number of moles of chlorine by the molar mass of NaCl:

mass = (number of moles) * (molar mass of NaCl)

In this case, the mass of NaCl that is produced is 0.005 moles * 58.44 g/mol = 0.292 grams.

Therefore, the reaction of 112 cm³ of chlorine at STP with an excess of sodium can produce 0.292 grams of NaCl.

Answer:

i) B, ii) A, iii) C

Explanation:

give me brainliest

The volume of nitrogen gas equal to 5.42x1022 molecules of this substance is, 19.28 liters.

First we have to calculate the moles of nitrogen gas.

As 6.022x1023 molecules present in 1 mole of nitrogen gas

So 5.42x1022 molecules present in 5.42*1022/6.022*1023=0.8609mole of nitrogen gas.

Now we have to calculate the volume of nitrogen gas

As we know that, 1 mole of substance occupies 22.4 L volume of gas at STP.

As, 1 mole of nitrogen gas occupies 22.4 L volume of nitrogen gas

So, 0.8609 mole of nitrogen gas occupies 0.8609*22.4=19.28L  volume of nitrogen gas

Therefore, the volume of 5.42x1022  nitrogen gas equal to  molecules of this substance is, 19.28 liters.

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The sigma bond in acetylene \((C_2H_2)\) is formed by the overlap of the 1s orbitals of the two carbon atoms and the 2s orbital of the two hydrogen atoms.

To form the sigma bond, the 1s orbital of each carbon atom must overlap with the 2s orbital of the adjacent hydrogen atom. The sigma bond is the strongest type of covalent bond and has the lowest bond dissociation energy.

The approximate bond angle in acetylene is 109.5 degrees. This bond angle is determined by the geometry of the molecule and the arrangement of the atoms in space. The bond angle in acetylene is slightly distorted from a perfect tetrahedral shape due to the electron density distribution in the molecule.  

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Answer:  Count only the electrons in the highest shell s and p orbitals when determining valence.

Explanation:  I'm glad you asked this question.  It is often not well explained.   The term valence electrons is assigned to only the electrons in an element's highest energy level.  These reside only in the s and p orbitals, and not the d or f, as I'll explain later.  The s orbital can hold 2 electrons and the p can hold 6.  Potassium, K, has an s orbital in its highest energy shell, 4.  It contains only 1 electron, so it has a valency of 1.  

Calcium, Ca, has 2 in its highest energy level: 4s^2, so it has a valency of 2.   Moving to the right, the element scandium, Sc, add another electron, but it goes into the 3d orbital.  3d is in the 3rd energy shell, so it is not counted as a valence electron.  Only after we move further right, to gallium, Ga, do we start adding electrons to the 4th energy level again - the 4p orbitals can accept up to 6 electrons.  Ga has 3 valence electrons - 2 in the 4s and 1 in the 4p.  Oxygen has 2 in the 2s and 4 in the 4p orbitals, for a total of 6.  It is close to having a comple outer shell (2 in the 2s and 6 in the 2p).  Just 2 more electrons would fill both the 2s and 2p orbitals for a total of 8 valence electrons, a stable configuration (the same configuration as thje stable gas Neon).

Explanation:

Correct option is

D

3

The unbalanced chemical reaction is Al(s)+O

2

(g)→Al

2

O

3

(s)

Balance Al atoms by adding 2 to Al on LHS

2Al(s)+O

2

(g)→Al

2

O

3

(s)

Balance O atoms by adding

2

3

to O

2

on LHS

2Al(s)+

2

3

O

2

(g)→Al

2

O

3

(s)

Multiply the whole equation with 2.

4Al(s)+3O

2

(g)→2Al

2

O

3

(s)

This is the balanced chemical equation. The coefficient of O

2

is 3.

It takes approximately 100.704 years (since 1964) until only 9 percent of the original amount of radioactive strontium-90 absorbed remains.

The half-life of radioactive strontium-90 is given as 29 years, which means that every 29 years, the amount of radioactive strontium-90 is reduced by half.

To find the number of years it takes until only 9 percent of the original amount remains, we can set up the following equation:

(0.5)^(t/h) = 0.09

Where:

t represents the number of years since 1964 (the initial time),

h represents the half-life of 29 years, and

0.09 represents 9 percent.

Let's solve for t:

(0.5)^(t/29) = 0.09

Taking the natural logarithm (ln) of both sides:

ln[(0.5)^(t/29)] = ln(0.09)

Using the logarithmic property: ln(a^b) = b × ln(a):

(t/29) × ln(0.5) = ln(0.09)

Dividing both sides by ln(0.5):

t/29 = ln(0.09) / ln(0.5)

t = 29 × (ln(0.09) / ln(0.5))

Using a calculator, we can find the value of t:

t = 29 × (-2.40794561 / -0.69314718)

t = 100.704

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Coulomb's law can be applied qualitatively to describe the interactions of ions before they dissociate and the attractions between ions and the solvent after the solution forms.

Coulomb's law states that the force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Before dissociation, ions in a solid are strongly attracted to each other due to their opposite charges. The positive and negative ions are held together in a crystal lattice by electrostatic forces governed by Coulomb's law.

The strength of the attraction depends on the magnitude of the charges and the distance between them.

After the solution forms, when the solid dissolves in a solvent, the ions separate and become surrounded by solvent molecules.

The solvent molecules interact with the ions, creating attractive forces between them. These attractive forces between the ions and the solvent are also described by Coulomb's law.

The magnitude of the charges and the distance between the ions and the solvent molecules determine the strength of the attractions.

In summary, Coulomb's law can be used to explain the interactions between ions before they dissociate in a solid and the attractions between ions and the solvent after the solution forms.

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The boiling temperature of bromine is 331.29 K

Explanation:

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

Br₂ (l) —> Br₂(g)

Enthalpy change (ΔH) = 30.91 KJ/mol

Entropy change (ΔS) = 93.3 J/mol·K

Next, we shall convert 30.91 KJ/mol to J/mol. This can be obtained as follow:

1 KJ/mol = 1000 J/mol

Therefore,

30.91 KJ/mol = 30.91 × 1000

30.91 KJ/mol = 30910 J/mol

Thus, 30.91 KJ/mol is equivalent to 30910 J/mol.

Finally, we shall determine the boiling temperature of bromine. This can be obtained as follow:

Enthalpy change (ΔH) = 30910 J/mol

Entropy change (ΔS) = 93.3 J/mol·K

ΔS = ΔH / T

93.3 = 30910 / T

Cross multiply

93.3 × T = 30910

Divide both side by 93.3

T = 30910 / 93.3

T = 331.29 K

Thus, the boiling temperature of bromine is 331.29 K

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.energy mechanical needs it Answer:

Yes.

Explanation:

Answer:

0.409 m

Explanation:

The molarity of the original K₂CO₃ solution given the data from the question is 0.409 M

H₂SO₄ + K₂CO₃ —> K₂SO₄ + CO₂ + H₂O

From the balanced equation above,

MaVa / MbVb = nA / nB

(0.25 × 38.4) / (Mb × 23.5) = 1

9.6 / (Mb × 23.5) = 1

Cross multiply

Mb × 23.5 = 9.6

Divide both side by 23.5

Mb = 9.7 / 23.5

Mb = 0.409 M

Thus, the molarity of the K₂CO₃ solution is 0.409 M

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