Three aqueous solutions are mixed, 1.0 M (NH4)2SO4, 1.0 M Sr(OH)2 and 1.0 M CoCl3. The two precipitates are __ and __.

Answer:

Explanation:

For amount of radiation from a hot body there is Stefan's Boltzman's law which is given below .

E = e σ T⁴

E is amount emitted , e is emissivity , σ is stefan's constant = 5.67 X 10⁻⁸ W / m² . for earth e =.85 approx

E = .85 x 5.67 X 10⁻⁸ x T⁴

604 = .85 x 5.67 X 10⁻⁸ x T⁴

604 = 4.82 x 10⁻⁸ T⁴

T⁴ = 125.31 x 10⁸

T =  3.3457 x 10²

= 334.57K

Temperature in Celsius = 334.57 - 273

= 61.57 Celsius .

Answer:

Embryonic stem cells

Explanation:

Answer:

C.)

Explanation:

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Answer:

Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons). Examples include neon, argon (Ar), and krypton . Oxygen, like all the other elements in group 16, has six valence electrons.

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The malady affecting Tank 104, characterized by volatile aromas, a brownish color, and a flat, dull taste, is likely a result of microbial spoilage known as acetic acid bacteria (AAB) infection or acetobacter infection.

The significant increase in acetic acid concentration from 0.65 g/L to 2.73 g/L suggests the presence of acetic acid bacteria, which metabolize ethanol into acetic acid during the fermentation process. This bacterial infection leads to the production of acetic acid, causing the wine to have a vinegary or sharp taste and volatile aromas.

The increase in lactic acid concentration from 0.75 g/L to 3.40 g/L indicates the activity of lactic acid bacteria, which can also contribute to wine spoilage. These bacteria convert malic acid into lactic acid, resulting in changes in acidity and flavor.

The increase in pH from 3.70 to 4.10 and the significant drop in tartaric acid from 2.7 g/L to 0.06 g/L further support the presence of bacterial activity, as these changes are consistent with microbial metabolism.

In this case, the prolonged exposure to elevated temperatures due to the power outage created favorable conditions for the growth and activity of acetic acid bacteria and lactic acid bacteria.

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Explanation:

pH is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions are measured to have lower pH values than basic or alkaline solutions. The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution.

Peptide bonds can be identified in larger molecules by locating the presence of an amide linkage (-C(O)NH-) between the carboxyl group of one amino acid and the amino group of another amino acid.

To identify a peptide bond in larger molecules, one can look for the characteristic amide linkage (-C(O)NH-) that forms between the carboxyl group of one amino acid and the amino group of another amino acid. Peptide bonds are formed through a condensation reaction, where the carboxyl group loses a hydroxyl group (-OH) and the amino group loses a hydrogen atom (-H), resulting in the formation of a covalent bond between the carbonyl carbon of one amino acid and the nitrogen of another. This peptide bond is crucial for the formation of polypeptides and proteins, as it links the individual amino acids together into a linear chain, providing structural stability and allowing for diverse functional properties.

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Answer:

lose 1 2+

Explanation:

I honestly don't know

Answer: I think its c or d

Explanation:

Answer:

(c)

Explanation:

in both black and red

Answer:

I think 3 im am not sure

Explanation:

Corrosive chemicals initiate irreversible alterations.

Corrosive substances are exceptionally reactive substances which have the potential to cause irreversible, visible destruction to any living tissue at the point of contact (due to the chemical reaction that takes place at that point of contact). They can be solid, liquid or gaseous and can result in severe life changing alterations on important body parts such as the sense organs (such as eyes, skin, etc). They will start dissolving flesh the moment they come in contact with skin, leaving burns behind. Corrosive chemicals can seriously harm people when they come into contact with their eyes, including corneal damage and even blindness. Highly acidic and highly basic chemicals (having extreme pH) are the most potent corrosive agents. Apart from damage to humans, they have the potential to harm property and environment since they can deteriorate certain materials, including steel and stone. If corrosive chemicals leak or spill, they can also ruin machinery and property. This might apply to fleet vehicles that transport chemical items, buildings where corrosives are kept, or instruments and equipment that come into touch with spilled material.

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The elasticity coefficient for an enzyme in the multistep pathway will depends on the concentration of the enzyme itself and the amounts of the substrate molecules present at each step. Option D is correct.

The elasticity coefficient is a measure of the sensitivity of the rate of the overall reaction to changes in the concentrations of the individual enzymes or substrates in the pathway. A higher elasticity coefficient indicates that the reaction rate is more sensitive to changes in that particular component.

In a multistep pathway, the elasticity coefficient of each enzyme depends on its own concentration as well as the concentrations of the substrates and products that it interacts with in its particular step of the pathway.

Therefore, both the concentration of the enzyme and the amounts of substrate molecules present at each step can affect the elasticity coefficient of an enzyme in a multistep pathway. The levels of regulatory molecules (option B) may also affect the elasticity coefficient of an enzyme, but this is not the only factor that determines it.

Hence, D. is the correct option.

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Answer:

D it's a chemical change

Answer:

charge of copper.. ........mark me brainlest

Answer:

3.06 atm

Explanation:

Using general gas law equation as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (litres)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK

T = temperature (K)

According to the information provided in this question, V = 4L, T = 25°C = 25 + 273 = 298K, n = ?

Mass of He gas = 2.0g

Using mole = mass ÷ molar mass

Molar Mass of He = 4g/mol

mole = 2/4

mole = 0.5mol

Using PV = nRT

P = nRT/V

P = 0.5 × 0.0821 × 298 ÷ 4

P = 12.233 ÷ 4

P = 3.06 atm

Hence, the pressure inside the container is 3.06atm.

Answer:

Fill in the blanks: IONIC compounds break up into ANIONS and CATION in solution, which can move freely and carry an ELECTRICAL current.

We can use different properties and changes to identify a chemical substance through the following below:

This is referred to as a type of substance which has a definite composition and properties and it is based on different factors.

Pure substances have their own unique properties and a mixture can be separated by using the right techniques through this which is why all is the correct choice.

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Answer:

the answer is 9.6853

Explanation:

I got it right

The maximum possible efficiency for such an engine is 6.039 %.

Temperature of water near the surface of a tropical ocean = 298.2 K

Temperature of water 700 m beneath the surface = 280.2 K

To find the maximum possible efficiency for the given heat engine,

The maximum possible efficiency of a heat engine depends only on the temperatures of the hot and cold reservoirs, and is given by Carnot efficiency,  η = (T₁ - T₂)/T₁

whereT₁ is the temperature of hot reservoir, T₂ is the temperature of cold reservoir. Temperature is given in Kelvin.

The temperature difference between the hot and cold reservoirs is, T₁ - T₂ = 298.2 K - 280.2 K = 18 K

Substitute these values in the Carnot efficiency equation,

Carnot efficiency, η = (T₁ - T₂)/T₁ = (18 K)/298.2 K = 0.06039. The maximum possible efficiency for such an engine is 6.039 %.

Generalised function is given as η = (T₁ - T₂)/T₁

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Answer:

\(n_{Na_2CO_3}=0.28molNa_2CO_3\)

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

\(Na_2CO_3(aq)+CaCl_2(aq)\rightarrow CaCO_3(aq)+2NaCl(aq)\)

Hence, given the solution of calcium chloride, we can compute its reacting moles:

\(n_{CaCl_2}=0.35\frac{mol}{L}*803.1mL*\frac{1L}{1000mL}= 0.28molCaCl_2\)

Thus, by knowing there is a 1:1 molar ratio between sodium carbonate and calcium chloride, we can easily compute the moles of sodium carbonate needed for a complete precipitation as shown below:

\(n_{Na_2CO_3}=0.28molCaCl_2*\frac{1molNa_2CO_3}{1molCaCl_2} \\\\n_{Na_2CO_3}=0.28molNa_2CO_3\)

Best regards.

Answer:

A. is the correct answer because Boron has 3 electrons too,

All elements in Group 13 have three electrons in their outermost energy level. The two most popular elements in this group are Boron and Aluminum.

Explanation:

Answer:

From left box to right box: Footwall, fault plane, hanging wall

Explanation:

A foot wall is the one holding us the hanging wall so the highest piece. Think of rock climbing. You put your feet on the wall or rocks to push yourself up. The foot wall is the rocks for the hanging wall.

The hanging wall is the part that's "hanging" from the other wall. So the lowest one. Think of it as the part that's hanging.

A fault plane is where the place where the fault happens which would be where there is the difference in elevations originate from. Think of it like the crack in the middle.

Don't be afraid to reach out if you need further help, I hope this helps!

The bones are approximately 7539 years old.

A radioactive substance follows the model of exponential decay. This is the model that predicts the half-life of substances. It is given by the following exponential equation.

\(A = A_{0}e^{-kt}\)

Where

\(A_{0}\)     is the initial amount present at the start,

t  is the time, and

k  is the constant that governs the rate of decay. Use this model to solve the age of the bones.

Evaluating the question :

When a radioactive substance reaches its half-life, half its original amount will be decayed away due to radiation. Using the exponential decay model,

                                              \(A = A_{0} e^{-kt}\)

substitute \(A = \frac{1}{2} A_{0}\),   and the half-life of the element to determine k completing the full model of the decay.

                                     \(\frac{1}{2}A_{0} = A_{0} e^{- 5750k}\)

The first thing to do, is to divide both sides with \(A_{0}\)

                                       \(\frac{\frac{1}{2}A_{0} }{A_{0} } = \frac{A_{0}e^{-kt} }{A_{0} } \\ \frac{1}{2} = e^{-5750k}\)

Now, take the natural logarithm of both sides of the equation.

                                        \(ln(\frac{1}{2}) = ln e^{-5750k}\)

                                       \(ln(\frac{1}{2}) = -5750k\)

Divide both sides of the equation with  −5750, then evaluate using a logarithm table or a calculator.

                                  \(k = 1.2054734\)× \(10^{-4}\)

Now, that the constant is determined, this means the exponential decay of the radioactive substance is modeled by the following equation.

                                   \(A = A_{0} e^{- 1.2054734 * 10^{-4} }\)

The bones that were found lost 59.7% of the carbon-14 originally present. Using symbols, this can be written as,

                                           \(A = A_{0} - 59.7%\\\\A = A_{0} ( 1 - 0.597)\\\\A = 0.403A_{0}\)

This means that only 40.3 %  of the radioactive substance remained. Substitute this to the mathematical model above, then solve for the time in years.

                               \(0.403A_{0} = A_{0} e^{-1.2054734 *10^{-4} }\)

Now, take the natural logarithm of both sides of the equation.

                                      \(ln0.403 = -1.2054734 *10^{-4} t\)

Now, solve for t by dividing both sides of the equation with −1.2054734 ×

\(10 ^{-4}\)

Evaluate using a logarithm table or a calculator.t = 7539.10 years

Therefore, the bones are approximately 7539  years old.

The half-life of a radioactive isotope is that the amount of time it takes for one-half of the radioactive isotope to decay. The half-life of a selected radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope

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Option (A) is correct. Bases holding two single strands of DNA together into a double strand of DNA interact through Hydrogen bonds.

The bases holding two single strand of the DNA molecule is held together by hydrogen bonding. These bonding occurs between the nitrogenous bases in the two strands of DNA. The specific base pairings for DNA molecules are the Adenine-Thymine and the Cytosine-Guanine. The DNA double helix is held together by two types of bonds that is covalent bond and hydrogen bond. Covalent bonds occur within each linear strand and strongly bond the bases, sugars, and phosphate groups  that is both within each component and between components. Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing in the DNA. These hydrogen bonds in the DNA are individually weak but collectively quite strong.

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The complete question is,

Bases holding two single strands of DNA together into a double strand of DNA interact through ___________ bonds.

A. hydrogen

B. covalent

C. chemical carbon

D. ionic

The formula for a molecular formed form N and Cl would be N\(Cl_{3}\).

According to the given configuration of Nitrogen(N) and Chlorine(Cl) we have,

N needs 3 electrons and Cl needs 1 electron to complete their octet.

Therefore, one atom of N will combine with three atoms of Cl.

So the molecular formula of the compound formed will be N\(Cl_{3}\).

The addition reaction is:

    N    +     Cl     ------->    N\(Cl_{3}\)

(nitrogen)   (chlorine)     ( Nitrogen(III) chloride)

Therefore the formula for a molecule formed from N and Cl would be N\(Cl_{3}\).

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Intermolecular force is the force acting between two different molecules. There are various kinds of intermolecular forces and the they differ in their strength.

Intermolecular forces are force of attraction or repulsion acting between two different molecules in a compound. The like charges of molecules repels and unlike charges will attracts together.

There are different kinds of intermolecular forces such as hydrogen bonding, Van der Waal's forces, dipole, dipole forces, London dispersion forces etc.

The strength of these forces vary from each other. The intermolecular force of attraction holds tow molecules together in a compound. Hence, option D is correct.

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