The Ka of a bicarbonate ion, hco3- is 4.8x 10^-11 what [co3^2]/[hco3] ratio is necessary to make a buffer with a Ph of 11.00? 

The metals in the following set which will have equal density are:

So, the correct options are 2,3 and 6.

A substance or object's density can be found out by comparing its mass to volume. Density is calculated using the formula:

\(density = \frac{mass}{volume}\)

It is an essential property that the density of the same material remains constant at varied masses and volumes. Since the metal used in both situations is the same and metal has a fixed value of density, the choice with sets of the same metals has equal densities across the possibilities provided.

The complete question is as follows:

To save time you can approximate the initial volume of water to ±1 mL and the initial mass of the solid to ±1 g. For example, if you are asked to add 23 mL of water, add between 22 mL and 24 mL. Which metals in each of the following sets will have equal density?

1. 20.2 g gold placed in 21.6 mL of water and 12.0 g copper placed in 21.6 mL of water.

2. 20.2 g silver placed in 21.6 mL of water and 12.0 g silver placed in 21.6 mL of water.

3. 15.2 g copper placed in 21.6 mL of water and 50.0 g copper placed in 23.4 mL of water.

4. 15.4 g gold placed in 20.0 mL of water and 15.7 g silver placed in 20.0 mL of water.

5. 20.2 g silver placed in 21.6 mL of water and 20.2 g copper placed in 21.6 mL of water.

6. 11.2 g gold placed in 21.6 mL of water and 14.9 g gold placed in 23.4 mL of water.

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Two elements having same properties as magnesium are calcium and strontium. The number of protons and neutrons in  potassium is 19 and number of neutrons is 20.

Groups in periodic table are vertical columns with elements of similar physical and chemical properties. All elements are classified into different groups based in the number of valence shell electrons.

Elements of same group have same number of valence electrons. The element magnesium Mg have 12 electrons with 2 valence electrons. Its group members are shown under Mg in the column and they are calcium, strontium and rubidium.

Number of electrons in an tom is equal to the number of protons and this is called the atomic number. The atomic number o potassium is 19 and it have 19 electrons and protons.

Number of electrons = mass number-number of protons

                                   = 39 -19 =20.

Hence, potassium  (K) have 19 electrons and protons and 20 neutrons.

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Answer:

Gravity helps move water into the ground.

Answer:

C. Bonds connecting atoms in reactants break and bonds connecting atoms in products form.

Answer:

water

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The balanced chemical equation is:

0.5C7H16 + O2 → 0.5CO2 + H2O

For balancing the chemical equation C7H16 + O2 → CO2 + H2O, we can use linear algebraic techniques. We need to determine the coefficients that balance the number of atoms on both sides of the equation.

Let's denote the coefficients for C7H16, O2, CO2, and H2O as a, b, c, and d, respectively.

The balanced chemical equation can be written as:

aC7H16 + bO2 → cCO2 + dH2O

To balance the carbon (C) atoms, we have:

7a = c (Equation 1)

To balance the hydrogen (H) atoms, we have:

16a = 2d (Equation 2)

To balance the oxygen (O) atoms, we have:

2b = 2c + d (Equation 3)

We have three equations (Equations 1, 2, and 3) and four unknowns (a, b, c, d). To solve this system of equations, we can write it in matrix form and find the solution using linear algebraic techniques.

The augmented matrix for the system of equations is:

[ 7 0 -1 0 | 0 ]

[ 0 0 0 -2 | 0 ]

[ 0 -2 2 -1 | 0 ]

By performing row operations to row-reduce the augmented matrix, we can obtain the solution:

[ 1 0 -0.5 0 ]

[ 0 1 -1 -0.5 ]

[ 0 0 0 0 ]

The solution to the system of equations is:

a = 0.5

b = 1

c = 0.5

d = 1

Putting the values of a,b,c, and d we get the balanced chemical equation as:

0.5C7H16 + O2 → 0.5CO2 + H2O

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When a quantity of N₂O₄ is introduced into a flask at an initial pressure of 2 atm at temp T and after that the N₂O₄ has decomposed to NO₂ and has come to equilibrium, the pressure of N₂O₄ is 1.8 atm. The value of Kp for the process is 0.0889.

For the given reaction equation can be written as

                                    N₂O₄(g)  2NO₂(g)

 Initial(atm)                    2                             0

 Change(atm)                -x                            +2x

 Equilibrium(atm)          2-x                           2x

    Given that

      2-x = 1.8 atm

          x= 0.2 atm

  ∴ Pressure of NO₂(g) at equilibrium = 2x

                                                              = 0.4  atm

                          Kp = P(NO₂(g))² /P( N₂O₄(g))

                                 =(0.4)²/1.8 = 0.0889

Hence, the value of Kp is 0.0889.

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The aqueous solubility of He at 1 atm and 20°C is 0.0928 mg/L. To convert the aqueous solubility of He from mol/L/atm to mg/L, we need to consider the molar mass of He, which is approximately 4.003 g/mol.

The conversion factor we need is:

1 mol He / (4.003 g He) x 1000 mg / 1 g = 249.8 mg He / mol He

Using the given solubility of He at 20°C (0.00037 mol/L/atm), we can calculate the aqueous solubility of He at 1 atm and 20°C:

Aqueous solubility of He = (0.00037 mol/L/atm) x (1 atm) x (249.8 mg He/mol He)

Aqueous solubility of He = 0.0928 mg/L

Therefore, the aqueous solubility of He at 1 atm and 20°C is 0.0928 mg/L.

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Answer: 1. Sodium Benzoate

Explanation: An anti-oxidant is a substance that can help prevent or stop the damage done by free radicals. Examples include; Sulphur Dioxide, Sulphite Salts, Citric Acid, e.t.c

Sodium benzoate is a pure preservative.

The amount of reactant and product that changes per unit of time is the rate expression for the reaction. The change in reactant and product concentration over time is depicted by the rate expression.

Although it is unnecessarily simplified, the rate expression (3.35) has been found to be extremely useful in many situations. Let's define a basic reaction so that we can continue our conversation. A reaction is considered to be elementary if the reactants (or reacting molecules) always respond stoichiometrically. For instance, in an elementary reaction, A and B can spontaneously transform into C when they come into contact without needing to do any further action. Therefore, idealised reactions or reaction stages are considered elementary reactions.

The rate of disappearance of ozone is the rate of difference of O3 is divided by 2.

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Answer:

shell ,orbit , this is the answer of this qn

The electronegativity of the element affects the ability of its compounds to dissolve in different solvents.

Electronegativity is a measure of an atom's ability to attract shared electrons to itself.

Polar bonds have a positive and negative side to them, and therefore can attract water dipoles and dissolve in water.

If the polarities of the solvent and solute match (both are polar or both are nonpolar), then the solute will probably dissolve.

If the polarities of the solvent and solute are different (one is polar, one is nonpolar), the solute probably won't dissolve.

Hence, option D is correct.

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Liquid to gas - Boiling: The phase change from a liquid to a gas that occurs when the substance reaches its boiling point, resulting in the formation of vapor.

Solid to gas - Sublimation: The phase change from a solid directly to a gas without going through the liquid state.

Solid to liquid - Melting: The phase change from a solid to a liquid when heat is applied, causing the substance to transition from a rigid to a more fluid state.

Liquid to solid - Freezing: The phase change from a liquid to a solid when the substance loses heat, resulting in the formation of a solid crystal lattice.

Therefore, the correct match would be:

Liquid to gas - Boiling

Solid to gas - Sublimation

Solid to liquid - Melting

Liquid to solid - Freezing

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The equation E = mc² describes the relationship between energy and mass and reveals that energy and mass are interchangeable and interrelated.

The equation E = mc², formulated by Albert Einstein in his theory of special relativity, is a fundamental equation in physics. It establishes the equivalence between energy (E) and mass (m) and demonstrates their interdependence.

In the equation, c represents the speed of light in a vacuum, which is a constant value. The equation states that the energy (E) of an object is equal to its mass (m) multiplied by the square of the speed of light (c) squared.

This equation implies that mass can be converted into energy and vice versa. It highlights the concept of mass-energy equivalence, which suggests that mass can be considered a form of energy. When mass is converted into energy, it can be released in various forms, such as heat, light, or other types of energy.

Furthermore, the equation reveals that a small amount of mass can contain an enormous amount of energy. The speed of light squared (c²) is a large value, indicating that even a tiny amount of mass can yield a significant amount of energy when converted.

The equation E = mc² describes the identities of energy and mass by establishing their interdependence and interchangeability. It demonstrates that mass can be converted into energy and vice versa, highlighting the concept of mass-energy equivalence. This equation reveals the profound relationship between energy and mass, emphasizing that even a small amount of mass can contain a substantial amount of energy.

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The small stretches on a chromosome  of a deoxyribonucleic acid (DNA) molecule on a particular site is known as gene.

Gene is a fundamental, structural and operational component of heredity in living beings. They serve as a blueprints for synthesis of proteins. Genes are responsible for transfer of traits from parents to the progeny.

The sequence of nucleotide on a DNA strand determines the coding for various proteins. From a few hundred DNA bases to more than 2 million bases, genes range in size. Every human contains two copies of same gene, one from each parent.

Protein-coding genes make up only around 1% of DNA; the remaining 99% is non-coding genes. There are no protein-making instructions in non-coding part of DNA.

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Answer: 11.478

Explanation:

M   =   MBVB- MAVA/VA + VB

      = number of moles of base - number of moles of acid/total volume

      = 3.6*10^-3 - 5.95*10^-4/1

      = 0.0036-0.000595   = 0.003005

[OH^-]   = M = 0.003005M

POH  = -log[OH^-]

         = -log0.003005

         = 2.522

PH   = 14 - POH

       = 14 - 2.522  

       = 11.478

Therefore, the pH of the solution is 11.478

Answer:

In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Explanation:

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Answer:

even though the particles of a liquid are moving, they are attracted to each other so they don't spread far apart to become a gas.

Explanation:

"but some do when they evaporate"

In liquids, the particles are allowed to move freely rather than the solid. The gaseous particles can move more freely than liquids.

In liquids, the particles are placed randomly and thus are allowed to move freely but they do not become a gas as liquids are slightly less compressible than gases.  Even though the particles of a liquid are moving, they are attracted to each other so they don't just spread far apart to become a gas.

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The Potassium-40 (40k) is a radioactive material that decays into argon-40 . the half-life of a sample of 40k is 1.3 billion years. the potassium - argon dating is the method that based on the radiometric dating.

The potassium - argon dating is the type of the geological method that is based on the radiometric dating. it detect the volcanic ash of rocks. the principles it is based on the is the radioactive disintegration. the half life of the sample is 1.3 billion years. the radioactive potassium isotope that is potassium 40 is in volcanic rocks. this will disintegrate at the known rate is inert gas that is argon 40.

The gas will be accumulated in the rock crystal. and determine several billions years. the potassium found in the micas, hornblendes and the feldspars.

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Answer:

B.

Explanation:

Velocity: the speed of something given direction

Acceleration: increase or decrease of velocity over time

B is the answer because it is the only point on the image that has to slow down and change direction. To turn, a vehicle must slow down so it doesn't skid. Hope this helps!

A race car traveling around the racetrack at a constant speed of 150km/hr at B point on the track is the car accelerating.

Acceleration is the rate at which an object's velocity with respect to time changes. They are vector quantities, accelerations. The direction of the net force applied on the item determines the object's acceleration.

An item has positive acceleration if it is accelerating and travelling in the right direction. Positive acceleration was demonstrated in the first case by the fast automobile.

The acceleration is in the same direction as the car's motion since it is moving ahead and speeding up.

The equation a = v/t denotes acceleration ( a ), which is the change in velocity ( v ) over the change in time ( t ). This enables you to calculate the change in velocity in meters per second squared  ( m/s² ).

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Sorry this question is incomplete.

Answer:

True

Explanation:

The mass of magnesium chloride produced in the reaction is 4.17 grams.

The balanced chemical equation for the reaction between Mg and HCl is:

Mg + 2HCl → MgCl2 + H2

To solve this problem, we need to determine which reactant is limiting and use its stoichiometry to calculate the amount of product produced.

First, we need to find the number of moles of Mg and HCl used in the reaction:

moles of Mg = 4.00 g / 24.31 g/mol = 0.1643 mol

moles of HCl = 3.20 g / 36.46 g/mol = 0.0878 mol

According to the balanced equation, the reaction uses 1 mole of Mg for every 2 moles of HCl. Therefore, Mg is in excess and HCl is the limiting reagent.

The stoichiometry of the balanced equation tells us that 2 moles of HCl produce 1 mole of MgCl2. So, the number of moles of MgCl2 produced can be calculated as:

moles of MgCl2 = 0.0878 mol HCl × (1 mol MgCl2 / 2 mol HCl) = 0.0439 mol MgCl2

Finally, we can calculate the mass of MgCl2 produced using its molar mass:

mass of MgCl2 = 0.0439 mol × 95.21 g/mol = 4.17 g

Therefore, the mass of magnesium chloride is 4.17 grams.

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Answer:

Even though plants are rooted in the ground, they still move, exert force, and do work.

Plant cells have very strong cell walls that allow pressure to build up inside of the cell as water is absorbed. This pressure is called turgor.

When turgor pressure is high enough in a cell, the cell walls become firm and as a result, the cell becomes rigid and the plant is able to stand tall and straight.

When a plant does not get enough water, the turgor pressure inside of the cells decreases. A decrease in pressure pushing against the cell wall causes the cells to lose their shape and shrink. This causes the plant to begin to droop or wilt.

When the wilted plant gets enough water, the cells will become rigid again, and the plant will stand firm and straight once again.

Explanation:

The answer is-  142.27 food calories are in the taco.

Heat capacity-The amount of energy needed to increase the temperature of a substance by one degree Celsius.

How heat released or gained is related to heat capacity?

\(q = m* C*\)Δ\(T\)

Where m is the mass of substance.

C is the heat capacity

and Δ\(T\) is the change in temperature.

\(Heat\ = (22.8 ^{0}\ C) * (31.2 kJ/ ^{0}\ C) = 711.36\ kJ\)

1 kJ = 0.2 food calories

Thus, the food calories in the taco are-

\(Food\ Calories\ in\ taco = (711.36\ kJ) * (0.2 Food\ calories/ kJ) = 142.27\ calories\)

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Answer:

500ml

Explanation:

because 100 ×2 is 200 and the 300

500ml

The formation of Zinc sulfide from 'Zn' and 'S' is a redox reaction, because it involves both oxidation and reduction reactions. So zinc bonds with sulfur to form zinc sulfide.

The zinc sulfide also called the zincblende is a white or yellowish crystal and it is insoluble in water as well as denser than water. It is manufactured by the combustion of a mixture of zinc and sulfur.

The compound 'ZnS' decomposes in the presence of oxidizing agents and acids. The reaction is given as:

Zn + S → ZnS

The oxidation reaction is:

Zn - 2e⁻ → Zn²⁺

The reduction reaction is:

S + 2e⁻  → S⁻²

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