determine the kb of an acid with a ka of 7.8x10-3. kw at 25 oc is 1x10-14 group of answer choices 1.3x10-11 1.3x1012 1.3x1011 1.3x10-12 1.3x10-10

Answer:

im an idiot but  i think its A

if im wrong im so sorry

Explanation:

Answer:

Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup."

Answer:

the dog barked is the answer

The correct equation representing the radioactive decay of 226Ra is (2)   226Ra → 222Rn + 4He.

This equation correctly represents the radioactive decay process of 226Ra (Radium-226) into 222Rn (Radon-222) and 4He (Helium-4).

In radioactive decay, unstable isotopes undergo a spontaneous process to transform into more stable forms by emitting particles or radiation. In the case of 226Ra, it decays by a process called alpha decay. Alpha decay involves the emission of an alpha particle, which consists of two protons and two neutrons (equivalent to a helium nucleus).

The equation (2) shows that 226Ra undergoes alpha decay, resulting in the formation of 222Rn and the release of an alpha particle (4He). The atomic number and mass number must be conserved in the decay process. Therefore, 226 (atomic number 88) on the left side of the equation decays to 222 (atomic number 86) on the right side, while the mass number also decreases by 4 units.

It's important to note that equation (1) represents an incorrect notation, as it suggests that 226Ra undergoes a transformation to 226Ra89, which is not possible as it implies an increase in atomic number. Equation (3) does not accurately represent the decay of 226Ra. Equation (4) is incorrect as it represents the formation of an isotope that doesn't exist.

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Answer:

The pituitary gland is located below the brain. :)

At the transition stage, one form of matter starts getting converted into another form of matter.

Solid, liquid and gas are the three phases in which matter occur in nature. Matter is interconvertible in nature i.e it can be converted from one form to another.

Melting, freezing and evaporation are the three phases of transition.

Liquid water at low temperature freezes to form solid ice. This process is known as freezing. Whereas, liquid water when provided high temperature or heat releases vapours. This process is known as evaporation. Solid ice when brought at room temperature gets converted back into liquid water. This process is known as melting.

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Answer: nonmetals are located on the upper right

Explanation:

Answer:

Four seasons occur on Earth

Explanation:

When the Earth has completely one revolution around the Sun, then it has completed 1 year, and four seasons have occurred in the meantime.

Four seasons occur on Earth when the Earth completes a revolution around the Sun.

The following points can be considered:

Therefore the correct answer is Four seasons occur on Earth.

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Answer:

Explanation:

The density of a substance can be found by using the formula

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

From the question we have

\(density = \frac{55.221}{67.1} \\ = 0.822965...\)

We have the final answer as

Hope this helps you

The characteristics and the type of molecular bond they describe:

1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond

2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond

3. Bonds inside the water molecule (between the H and O): Covalent bond

4. Bonds that exist between two water molecules: Hydrogen bond

5. Strongest bond type: Covalent bond

6. Weakest bond type: Van der Waals bond

7. Bonds that are used by water to dissolve salt: Ionic bond

The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.

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Answer:

pH is the number given to a substance of how powerful it is before 7 or beyond 7.

the solution is an acid.

Explanation:

Pls mark BRAINLIEST

Answer:

August 15, 1971

The nine sheikhdoms still had not agreed on terms of union by 1971, however, prompting Bahrain to declare itself fully independent on August 15, 197

1.A solution has a pH of 5, calculate the pOH, [H+], and [OH-]. Classify the solution as an acid, base, or neutral solution.

it's an acid

Explanation:

I hope that this helps

The type of reaction represented by the equation is replacement reaction.

A replacement reaction also known as displacement reaction is a reaction in which the ions of the reactant exchange to produce a new product. For example

AB + CD —> AD + CB

In the above reaction, we can see that D replaces B in the product which shows that the reaction is a replacement reaction.

NaCl + AgNO₃ → NaNO₃ + AgCl

In the above reaction, we can see that Cl replaces NO₃ in the product. This simply indicates that the reaction is a replacement reaction.

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Answer:

1. Heat from the pan transfers directly to the oil. 2. Heat from the pan transfers directly to the oil. 3. heated by the radiation in the microwave.

Explanation:

Answer:

Prolly 4

NH2 CONH2

Explanation:

Answer:

b

Explanation:

Answer:

At the completion of reaction.

Explanation:

The time when the reaction take places is the most significant time for measuring temperature of the solution because on this time the temperature will decrease or increase. Some reactions releases heat energy upon completion we called them exothermic reactions whereas some absorb heat energy from the surrounding, decreases the temperature which is known as endothermic reaction so measuring temperature at the completion of reaction is the correct time.

The element Sc (Scandium) was present in Mendeleev's periodic table. Therefore, the correct answer is (a) Sc.

Mendeleev's periodic table:

Mendeleev's periodic table is a chart that organizes all known elements based on their atomic number, chemical properties, and recurring patterns in their physical and chemical properties.

The periodic table consists of rows (called periods) and columns (called groups). Elements in the same group have similar chemical properties, while elements in the same period have the same number of electron shells.

Mendeleev published the first version of his periodic table in 1869, which included 63 elements known at that time. Scandium (Sc) was discovered in 1879 by Lars Fredrik Nilson and was later added to the periodic table in its proper position based on its atomic number and chemical properties.

On the other hand, Technetium (Tc) was not present in Mendeleev's periodic table because it was not discovered until 1937, long after Mendeleev's death. Similarly, Germanium (Ge) was not discovered until 1886, after the publication of Mendeleev's periodic table, but it was added to the periodic table in its proper position based on its properties.

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In the nitrate reduction test, sulfanilic acid and naphthylamine combine with nitrite ions to produce nitrous acid, which results in a red color change.

A nitrate reduction test is a diagnostic test used to detect the presence of bacteria that reduce nitrate to nitrite. The sulfanilic acid and naphthylamine combine to form a diazonium salt in the presence of nitrite ions. The diazonium salt then reacts with a coupling reagent (such as N-(1-Naphthyl)ethylenediamine dihydrochloride) to produce an azo dye with a red color. The color change indicates that nitrite is present in the sample.

In addition, the nitrate reduction test is utilized to differentiate between organisms that are capable of reducing nitrate to nitrite and those that can reduce nitrate to other forms such as N2O or N2.

This test is commonly used in microbiology laboratories, particularly in the identification of Enterobacteriaceae, which can be either positive or negative for nitrate reduction. Thus, nitrate reduction tests are a critical component of microbial identification. The results of these tests can help differentiate between species that are pathogenic and nonpathogenic, as well as between species that have different metabolic pathways.

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The notation for the enthalpy of the solution is ∆Hsol. The correct answer is option ∆Hsol.

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Answer:

something that deflects the Alpha particles

A radioactive element has decayed to 1/8 of its original concentration in 5 days. The half-life of this element is 5/3 days.

The decay of a radioactive element can be described by the equation N = N0(1/2)^(t/T), where N is the current concentration, N0 is the initial concentration, t is the time elapsed, and T is the half-life.

In this case, we are given that the current concentration is 1/8 of the initial concentration, or N/N0 = 1/8. We are also given that the time elapsed is 5 days. Substituting these values into the equation gives:

1/8 = (1/2)^(5/T)

Taking the logarithm of both sides (to any base) and solving for T gives:

log(1/8) = (5/T)log(1/2)

-3 = (-5/T)(-1)

T = 5/3 days

Therefore, the half-life of this radioactive element is 5/3 days.

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The type of subatomic particles that can be located within the nucleus of an atom is protons and neutrons. The correct option is C.

Subatomic particles are those particles that are present inside the atoms. These are present in different locations inside the atom. They are charged particles.

An electron is a negatively charged particle that rotates around the nucleus and a neutron is neutral, and a proton is a positively charged particle. Proton and neutrons are present inside the nucleus.

Thus, the correct option is C. protons and neutrons.

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The factor that caused the widely different separations between the four medicinal compounds is their different affinities for the stationary phase in the chromatographic technique used.

Chromatography is a separation technique that relies on the differential affinities of compounds between a mobile phase and a stationary phase. The stationary phase is a solid or liquid material that is immobilized on a support, while the mobile phase is a liquid or gas that moves through the stationary phase.

In chromatography, compounds with stronger affinity for the stationary phase will have slower movement and shorter distances traveled, while compounds with weaker affinity for the stationary phase will have faster movement and longer distances traveled.

The four medicinal compounds being separated in the chromatographic process possess different chemical properties, such as polarity, molecular size, and functional groups. These differences in chemical properties result in different interactions between the compounds and the stationary phase.

Compounds that have stronger interactions with the stationary phase, such as through hydrogen bonding or dipole-dipole interactions, will have slower movement and shorter separations. On the other hand, compounds with weaker interactions or higher solubility in the mobile phase will have faster movement and longer separations.

Therefore, the widely different separations observed between the four medicinal compounds can be attributed to their unique chemical properties, leading to varying degrees of affinity for the stationary phase in the chromatographic technique.

The differing chemical properties and affinities of the four medicinal compounds for the stationary phase caused the widely different separations observed in the chromatographic process.

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Answer:

no resonance

Explanation:

Since there is only one possible lewis structure C2H2 does not have resonance. A molecule has resonance if more than one lewis structure can be drawn for that molecule. For molecules with resonance, each lewis structure individually does not accurately depict the structure of the molecule

A extremely aggressive tumour of the central nervous system with a median survival time of only 15 months is called glioblastoma (GBM). It is obvious that treatment results need to improve. Aggressive local therapy are greatly restricted by the development of these cancers within the sensitive brain parenchyma and their infiltrative growth pattern.

An aggressive form of cancer called glioblastoma can develop in the brain or spinal cord. The astrocytes that support nerve cells are the source of glioblastoma development. Although glioblastoma can develop at any age, it often affects older persons more frequently. It may aggravate migraines, induce vomiting, nausea, and seizures.

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Answer:   The iron will sink and the sulfu will float

Explanation:  The iron/sulfu mixture only mixes the two elements.  Unless one ignites them, they will remain elements and can be separated based on the difference in their densities.

Answer:

No

Explanation:

different atoms do not have the same mass therefore a mole of one thing is not the same as a mole of another thing.

The heat absorbed by the solution is approximately 2.546 kJ.

In a constant-pressure calorimeter, the heat absorbed by the solution can be calculated using the equation:
q = m * c * ΔT
Where:
q = heat absorbed by the solution (in kilojoules)
m = mass of the solution (in grams)
c = specific heat capacity of water (4.18 J/g⋅°C)
ΔT = change in temperature of the solution (in °C)

To find the mass of the solution, we need to consider the volume and density of the solution. Since the density and specific heat of the solution are the same as water, we can assume that the density of the solution is 1 g/mL.

The total volume of the solution is the sum of the individual volumes of the Ba(OH)2 and HCl solutions, which is 70.0 mL + 70.0 mL = 140.0 mL = 140.0 g.

To convert the volume to mass, we use the density formula:

m = V * d

Where:
m = mass of the solution (in grams)
V = volume of the solution (in milliliters)
d = density of the solution (in grams per milliliter)

Using the density of 1 g/mL, the mass of the solution is 140.0 g.

The change in temperature (ΔT) is the final temperature minus the initial temperature, which is 28.74 °C - 24.38 °C = 4.36 °C.

Now, we can plug these values into the equation:

q = m * c * ΔT
  = 140.0 g * 4.18 J/g⋅°C * 4.36 °C
  = 2546.352 J
  = 2.546352 kJ

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Taking into account the reaction stoichiometry, 11.54 grams of Fe are formed from 16.5 grams of iron(III) oxide if hydrogen gas is in excess.

In first place, the balanced reaction is:

Fe₂O₃ + 3 H₂ → 2 Fe + 3 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 159.7 grams of Fe₂O₃ form 111.7 grams of Fe, 16.5 grams of Fe₂O₃ form how much mass of Fe?

\(mass of Fe=\frac{16.5 grams of Fe_{2} O_{3} x111.7 grams of Fe}{159.7 grams of Fe_{2} O_{3}}\)

mass of Fe= 11.54 grams

Then, 11.54 grams of Fe are formed from 16.5 grams of iron(III) oxide if hydrogen gas is in excess.

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