how did the color change of the bromothymol blue solution as the solution became more basic? how does this relate to the structure of the molecule?

Each astronaut uses approvimate 2500 kilocalories per day, and there are 4 Kilocalories perorane of glucose. 9404.2g is the mass of glucose will be required for the three astronauts.

In physics, mass is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of matter's resistance to changing its speed or location in response to the exertion of a force. The change caused by a force being applied is smaller the more mass a body has. Despite being connected to mass, weight is distinct from that latter. Weight fluctuates somewhat from place to place since it is essentially the force of Earth's gravitational attraction acting on stuff.

kilocalories per day = 2500 kilocalories

mass of glucose = 2500/4

                           = 625g

total mass of glucose =  625×3

                                    = 9404.2g

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Answer:

anime

Explanation:

Answer: In the photosystem II (PSII) reaction center, energy from sunlight is used to extract electrons from water. Explantion: The electron transport chain moves protons across the thylakoid membrane into the lumen.

i) SN2 occur on primary carbon and in that molecule -Br attach on primary carbon. During the reaction -Br attach carbon will form pentavalent intermediate.

ii) E1 occur on tertiary alcohol as it will procduce tertiary carbocation after removal of water molecule. tertiary carbocation is very stable.

iii) SN1, -Br will leave and produce secondary carbocation, then the hydride migration occur from 3o carbon to 2o to produce a 3o carbocation and methanol will attack on 3o carbocation and then H+ will leave to produce the product.

iv) E2, -H and -Br should be anti to each other and the most stable alkene will form.

Alkenes are a class of hydrocarbons (e. g, containing best carbon and hydrogen) unsaturated compounds with at least one carbon-to-carbon double bond. another time period used to explain alkenes is olefins. Alkenes are extra reactive than alkanes due to the presence of the double bond.

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That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.

4-  The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.

The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.

5-  The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.

The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.

So, Option B is correct.

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the rocky planet was exposed to harsh and forceful solar winds, which blew the Martian atmosphere away.

Another option for thickening the atmosphere of Mars, and, in turn, raising the temperature of the planet, would be to set up solar-powered, greenhouse-gas producing factories.

To calculate the enthalpy of the reaction, c. The second equation must be halved, d. The second equation must be reversed. and e. The third equation must be halved.

The enthalpy of the reaction is the sum of internal energy in a  system, in this case of the total energy of the reaction  under constant conditions.

Therefore, with this data, we can see that the enthalpy of the reaction is the sum of energy, which obeys a series of laws such as described above.

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Answer:

Carbon dioxide and silicone dioxide are both made with only non metals, magnesium oxide is formed with a metal and a non metal, Carbon dioxide has double bonds O=C=O, while silicone dioxide is made of single bonds.

The time it takes to heat this water in a 1-kg steel pan sitting on a 1,500-W electric stove burner that transfers 75% of its energy output to the water and the pan is 90 seconds (rounded to the nearest whole second).

We need to calculate the time taken to heat the water in a 1-kg steel pan sitting on a 1,500-W electric stove burner that transfers 75% of its energy output to the water and the pan. The given information are as follows:

Specific heat of water, cw = 4184 J/kg °C

Specific heat of steel, cs = 450 J/kg °C

Energy supplied by the electric stove burner, P = 1,500 W (75% of which is transferred to the water and the pan)

Mass of water, mw = 250 g = 0.25 kg

Mass of steel pan, ms = 1 kg

Initial temperature of water and steel pan, T1 = 10 °C

Final temperature of water and steel pan (boiling point of water), T2 = 100 °C

Heat absorbed by the steel pan = Qs = ms × cs × (T2 - T1)Heat absorbed by the water = Qw = mw × cw × (T2 - T1)

Total heat absorbed by the water and the pan = Q = Qw + Qs = (0.25 × 4184 × 90) + (1 × 450 × 90) J= 94,140 + 40,500 J= 1,34,640 J

Time taken to heat the water and the pan = t = Q/P= 1,34,640 / 1,500 s= 89.76 or 90 s

Therefore, the time it takes to heat this water in a 1-kg steel pan sitting on a 1,500-W electric stove burner that transfers 75% of its energy output to the water and the pan is 90 seconds (rounded to the nearest whole second).

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Answer:pp

Explanation:

Answer:

Explanation:

Answer: D. Solid

The amount of heat needed to boil 154 g of water, beginning from a temperature of 24.3°C, is approximately 397,000 J (rounded to 3 significant digits), with the unit symbol "J" for joules.

To calculate the amount of heat needed to boil 154 g of water, starting from 24.3°C, follow these steps:

Step 1: Determine the heat needed to raise the temperature of the water to its boiling point (100°C). To do this, use the formula: q = mcΔT, where q is the heat, m is the mass of the water, c is the specific heat capacity of water (4.18 J/g°C), and ΔT is the change in temperature.

Step 2: Calculate ΔT: ΔT = 100°C (boiling point) - 24.3°C (starting temperature) = 75.7°C.

Step 3: Calculate the heat needed to raise the temperature: q = (154 g) × (4.18 J/g°C) × (75.7°C) ≈ 49,000 J.

Step 4: Calculate the heat needed to change the water from liquid to gas. Use the formula: q = mL, where L is the heat of vaporization for water (2.26 x 10^3 J/g).

Step 5: Calculate the heat needed to vaporize the water: q = (154 g) × (2.26 x 10^3 J/g) ≈ 348,000 J.

Step 6: Add the heat needed to raise the temperature and the heat needed to vaporize the water: 49,000 J + 348,000 J = 397,000 J.

So, the amount of heat needed to boil 154 g of water, beginning from a temperature of 24.3°C, is approximately 397,000 J (rounded to 3 significant digits), with the unit symbol "J" for joules.

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Answer: B

Explanation:

Mixtures are a group of elements that are mixed together but not chemically combined

Elements are the fundamental materials of which all matter is composed.

Element: A substance that is made up of only one type of atom. Compound: A substance that is made up of more than one type of atom bonded together. Mixture: A combination of two or more elements or compounds which have not reacted to bond together

These factors include the choice of filtration mechanism, quality of filter media, regular maintenance

To produce the cleanest water, several factors contribute to an effective water filtration system. These factors include the choice of filtration mechanism, quality of filter media, regular maintenance and replacement of filters, pre-treatment processes, proper system design and flow rate, and regular monitoring and testing of water quality.

By considering and implementing these factors, water filtration systems can effectively remove impurities, contaminants, and ensure the production of clean, purified water.

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Answer:

what type of language this is ??

Answer:

same as the answer of her

Explanation:

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We have ,

\(\sf{ CaCl2 + K2CO3 \:gives \:CaCO3 + KCl }\)

Let's balance it

On reactant side,

On product side,

\(\sf{ CaCl2 + K2CO3 \:gives\: CaCO3 + 2KCl }\)

Double Displacement reaction :-

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:

A.

Explanation:

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Xenon(Xe ) is the least abundant element on the earth. The correct option is option A.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

Oxygen, water, and nitrogen are the most abundant molecule on the earth. Xenon is the least abundant amongst all given option. Xenon belongs to noble gas family. So, Xenon is not reactive at all.  Xenon does not form any compound with any other element so its abundance on earth is very less.

Therefore,  Xenon(Xe ) is the least abundant element on the earth. The correct option is option A.

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Answer:

The charge of a Strontium atom that has 10 electrons is 4.48 × 10⁻¹⁸ C

Explanation:

The atomic number of Strontium is 38

The electronic configuration of Strontium is given as follows;

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s²

The atomic number of Strontium is 38 electrons in orbit and 38 protons in its nucleus and is electronically neutral

38e⁻ + 38e⁺ = 0

When there are only 10 electrons in an atom of Strontium, we have;

10e⁻ + 38e⁺ = +28e

The charge of a Strontium atom that has 10 electrons is +28e

+28e = 28×1.6×10⁻¹⁹ C = 4.48 × 10⁻¹⁸ C

The charge of a Strontium atom that has 10 electrons is +28e or 4.48 × 10⁻¹⁸ C.

Answer:

The complementary sequence of bases in the complementary strand of the given single DNA strand AACTCTGCCAT will be:

TTGAGACGGTA

Explanation:

The primary structure of DNA is a double-stranded helix of nucleotides linked to each other by phosphodiester linkages. The two strands of the DNA molecule is complementary to each other. While one strand is linked in the 3' to 5' direction, the other strand is linked in the 5' to 3' direction. The two strands are held together by hydrogen bonds between the nucleotides of the two strands and this is known as base pairing. In base pairing, adenine nucleotide, A, on one strand forms two hydrogen bonds with thymine nucleotdie, T, in the other strand. Also, guanine nucleotide, G, in one strand, forms three hydrogen bonds with cytidine nucleotide, C, in the complementary strand.

Therefore, once the nucleotide sequence of one DNA strand is known, the nucleotide sequence of the complementary strand can easily be deduced.

The complementary sequence of bases in the complementary strand of the given single DNA strand AACTCTGCCAT will be: TTGAGACGGTA

When 50 NBr3 molecules and 57 NaOH formula units react according to the given balanced equation, the result is the formation of 150 NaBr formula units.

According to the balanced equation provided:

2 NBr3 + 3 NaOH -> N2 + 3 NaBr + 3 HOBr

From the equation, we can see that 2 moles of NBr3 react with 3 moles of NaOH to form 3 moles of NaBr.

To determine the number of NaBr formula units formed, we need to convert the given quantities into moles.

Given:

Number of NBr3 molecules = 50

Number of NaOH formula units = 57

To convert the number of NBr3 molecules to moles, we need to divide the given quantity by Avogadro's number. Similarly, for NaOH formula units, we can directly consider them as moles.

Using Avogadro's number (6.022 x 10^23 molecules/mol), we can calculate the number of moles for NBr3 and NaOH:

Number of moles of NBr3 = 50 / (6.022 x 10^23)

Number of moles of NaOH = 57

Now, we can use the mole ratios from the balanced equation to determine the number of moles of NaBr formed. From the equation, we know that 2 moles of NBr3 react to form 3 moles of NaBr.

Number of moles of NaBr = (Number of moles of NBr3) x (3 moles of NaBr / 2 moles of NBr3)

Finally, we can convert the number of moles of NaBr to the number of NaBr formula units using Avogadro's number:

Number of NaBr formula units = (Number of moles of NaBr) x Avogadro's number

Calculating these values, we find that 50 NBr3 molecules and 57 NaOH formula units react to form 150 NaBr formula units.

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Answer:

81 grams of Al

Explanation:

Relative atomic mass of Al = 27

Relative atomic mass in grams = Molar mass

∴ Molar mass of Al = 27g

That means; There's 27g of Al in 1 mole of Al.

1 mole ⇒ 27g

3.0 moles ⇒ 27 x 3.0 = 81g

The reducing agent in the redox reaction represented by the following cell notation is magnesium (Mg) in the cell notation: Mg(s) | Mg2+(aq) || Li+(aq) | Li(s).

In the given cell notation, the species on the left side of the cell notation (Mg) is undergoing oxidation, which means it is losing electrons and being oxidized. The species on the right side (Li) is undergoing reduction, which means it is gaining electrons and being reduced.

In a redox reaction, the reducing agent is the species that donates electrons to another species, causing it to be reduced. In this case, magnesium (Mg) is losing electrons and being oxidized, so it is the reducing agent in the reaction.

It's important to note that the reducing agent is always the species that is being oxidized in a redox reaction, as oxidation and reduction occur simultaneously.

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The correct choice for the equilibrium constant of a reaction is: B. Keq = [products]/[reactants] In a chemical reaction, equilibrium is reached when the rates of the forward and reverse reactions are equal, meaning that the concentrations of the reactants and products remain constant over time.

The equilibrium constant, Keq, is a ratio of the concentrations of products to the concentrations of reactants raised to their respective stoichiometric coefficients. The formula for Keq is: Keq = ([C]^c * [D]^d)/([A]^a * [B]^b) where [A], [B], [C], and [D] are the equilibrium concentrations of reactants and products, and a, b, c, and dare their stoichiometric coefficients. Keq helps to predict the extent of a reaction, with values greater than 1 indicating that the reaction favors the formation of products, and values less than 1 indicating that the reaction favors the formation of reactants.

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The names of covalent compounds indicate the number of atoms present through the use of numerical prefixes. These prefixes specify the quantity of each element in the compound.

For example, the numerical prefix "di-" is used to indicate the presence of two atoms. Therefore, when a covalent compound has two atoms of an element, the prefix "di-" is added to the element's name in the compound's name.

To illustrate this, let's consider the compound carbon dioxide (CO2). In carbon dioxide, the element carbon is combined with two atoms of oxygen. The prefix "di-" is used before the name of the second element, oxygen, to indicate the presence of two oxygen atoms.

Another example is the compound dinitrogen tetroxide (N2O4). In this compound, two nitrogen atoms (indicated by the prefix "di-") are combined with four oxygen atoms. The prefix "tetra-" is used to specify the presence of four oxygen atoms.

Here are some common numerical prefixes used in covalent compound naming:

Mono-: Indicates the presence of one atom.

Di-: Indicates the presence of two atoms.

Tri-: Indicates the presence of three atoms.

Tetra-: Indicates the presence of four atoms.

Penta-: Indicates the presence of five atoms.

Hexa-: Indicates the presence of six atoms.

Hepta-: Indicates the presence of seven atoms.

Octa-: Indicates the presence of eight atoms.

Nona-: Indicates the presence of nine atoms.

Deca-: Indicates the presence of ten atoms.

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The endocrine system is a complex system of glands and hormones that regulate many bodily functions and maintain homeostasis. Homeostasis refers to the body's ability to maintain a stable internal environment despite changes in the external environment. One example of the endocrine system maintaining homeostasis is the regulation of blood sugar levels by the pancreas.

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Answer:

d

Explanation: