Arcturus is a star whose surface temperature is 4290 K. What is most likely the color of Arcturus? What is most likely the mass of Arcturus? about solar masses.

Answer:

A. Nucleotide

Explanation:

Nucleotides are the monomers that make up nucleic acids, such as DNA and RNA.

The density of the liquid is 1.05 g/ml. To find the volume of 1.05 g of the liquid, we can use the formula:

Density = Mass / Volume

Solving for Volume, we get:

Volume = Mass / Density

Substituting the given values, we get:

Volume = 1.05 g / 1.05 g/ml

Volume = 1 ml

To convert ml to liters, we divide by 1000:

Volume = 1 ml / 1000

Volume = 0.001 L

Therefore, the volume of 1.05 g of this liquid is 0.001 liters.

To find the volume of 1.05 g of a liquid with a density of 1.05 g/mL, you can use the formula:

Volume = Mass / Density

Given:
Mass = 1.05 g
Density = 1.05 g/mL

Now, plug the values into the formula:

Volume = 1.05 g / 1.05 g/mL = 1 mL

Since 1 L equals 1000 mL, you'll need to convert the volume from mL to L:

Volume = 1 mL * (1 L / 1000 mL) = 0.001 L

So, the volume of 1.05 g of this liquid is 0.001 liters.

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Answer:

The formula of the compound that forms when Cu2+ combines with bromine ions is CuBr2

Explanation:

The copper ion has a charge of +2, and the bromine ion has a charge of -1.

In order to balance the charges, we need two bromine ions for every copper ion. So the formula is CuBr2.

This compound is also known as copper(II) bromide. It is a white solid that is soluble in water. It is used in a variety of applications, including photography, medicine, and manufacturing.

Answer:  The correct answer is C. Yellow to orange.

When a base is added to a potassium dichromate (K2Cr2O7) solution, the color change occurs due to the reduction of the chromium(VI) ions (Cr2O7 2-) to chromium(III) ions (Cr3+). The original color of the potassium dichromate solution is yellow-orange.

As the base is added, the solution becomes more alkaline, and the chromium(VI) ions undergo reduction to form chromium(III) ions. This reduction reaction results in a color change from yellow to orange.

Therefore, the correct answer is C. Yellow to orange.

Explanation:

1. The reaction would shift towards the left

2. The reaction would shift to the right

3. The reaction would shift to the right

4. The system would shift to the left

5. The reaction would move to the left

6. The reaction would move to the right

According to the Le Châtelier's principle, a system in equilibrium will adjust its equilibrium position in a way that tends to counteract any forced change when it is exposed to a change in temperature, pressure, or the concentration of reactants or products.

In other words, if a system is out of equilibrium, it will make adjustments to try to get back into balance.

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The volume of water added to dissolve potassium hydrogen phthalate (KHP) does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

In volumetric analysis, the primary objective is to find the exact concentration of an analyte in a given solution. Analyte refers to the substance whose concentration is to be determined.In order to measure the analyte concentration, the known volume of the titrant of known concentration is added to the analyte until the endpoint is reached.Endpoint refers to the point in a titration where the reaction between the analyte and titrant is complete. The endpoint can be detected by observing a physical change in the system.In the case of KHP, it dissolves completely in any volume of water.

Therefore, the mass of KHP used can be accurately measured and dissolved in any volume of water. As a result, the volume of water added to dissolve the KHP does not affect the accuracy of the experiment.In summary, the volume of water added to dissolve KHP does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

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A, distilled water, as it is not an appropriate solution for quality control of the refractometer calibration.

The calibration of the refractometer is an important aspect of its operation and ensures accurate readings. To quality-control the calibration, different solutions can be used. Distilled water is not an appropriate solution for calibrating a refractometer because it has no dissolved solids, so it will give a reading of 0°Brix, which does not help in the calibration process. However, 5% NaCl, 9% sucrose, and commercial controls are commonly used solutions to calibrate refractometers. The NaCl solution has a known refractive index and can be used to check the calibration of the refractometer. The sucrose solution is commonly used to calibrate refractometers that measure sugar content, as it has a known sugar concentration and refractive index. Commercial controls are also available for refractometers, and they are used to verify the accuracy of the refractometer over a range of concentrations. Therefore, the correct answer to the question is A, distilled water, as it is not an appropriate solution for quality control of the refractometer calibration.

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Answer:

1 atom of zirconium

Explanation:

Zirconium sulfide or zirconium disulphide can be written as ZrS2.

The overall enthalpy change i.e ΔH for the system is -1300 kJ.

Enthalpy change in a reaction is defined as the difference in the potential energy of the products and the potential energy of the reactants.

This is represented by ΔHreaction.

The reaction of enthalpy change is given as

ΔHreaction= ΔHproducts -  ΔHreactants

where ΔHproducts is the potential energy of the products

=[(-200) + (-300)]kJ

= -500kJ

And,  ΔHreactants is the potential energy of the reactants

=800KJ

Therefore, by putting these values ΔHreaction can be calculated as

ΔHreaction

= [-500-800] KJ

=-1300 KJ

Thus, the overall enthalpy change is -1300KJ

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The difference between a universal indicator and pH paper is that a universal indicator is a mixture of several different pH-sensitive dyes that can show a range of colors depending on the pH of a solution, while pH paper is a type of paper that is coated with a single pH-sensitive dye that changes color based on the pH of a solution.

Here is a step-by-step explanation:

1. A universal indicator typically shows a continuous range of colors corresponding to different pH levels. When you add a universal indicator to a solution, the resulting color will provide an estimate of the pH value. This allows for more precise pH readings compared to pH paper.

2. pH paper, on the other hand, is coated with a single dye, which changes color based on the pH of the solution being tested. You dip the paper into the solution, and the resulting color change indicates the approximate pH level. pH paper generally provides less precise readings than a universal indicator because it only has a limited number of color changes.

In summary, a universal indicator provides a more precise and continuous range of pH values, while pH paper gives an approximate pH value based on a limited number of color changes.

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Since an acidic salt solution is produced when a strong acid neutralizes a weak base, the pH of the salt solution formed when HCl is added to R2NH will be less than 7.

A neutralization reaction is the react ion between an acid and a base to form salt and water only.

Neutralization reactions can either produce a neutral solution, an acidic solution or an alkaline solution at equivalence point.

When a strong acid is added to a weak base, the pH of the salt solution formed will be less than 7.

Therefore, the pH of the salt solution formed when HCl is added to R2NH will be less than 7.

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Answer:

Modern science is typically divided into three major branches that consist of the natural sciences (biology, chemistry, physics, astronomy and Earth science), which study nature in the broadest sense; the social sciences (e.g. psychology, sociology, economics, history) which study people and societies; and the formal ...

Explanation:

The four major branches of science are, Mathematics and logic, biological science, physical science and social science. The first branch is mathematics & logic.

When the child sits on the partially filled balloon, the pressure of the balloon increases. The pressure change is a doubling of the initial pressure, indicating a factor of 2 increase.

When the child sits on a partially filled balloon, the volume of the balloon decreases by half. According to Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume at constant temperature, the pressure inside the balloon increases.

Let's consider the initial volume of the balloon as V and the initial pressure as P. When the volume decreases by half, it becomes V/2. Since the amount of gas remains constant, the pressure increases to maintain equilibrium. The new pressure can be denoted as P'.

According to Boyle's Law, P₁V₁ = P₂V₂, where P₁ and V₁ are the initial pressure and volume, and P₂ and V₂ are the final pressure and volume. Plugging in the values, we have P * V = P' * (V/2).

Simplifying the equation, we get P' = 2P. This means the pressure of the balloon increases by a factor of 2, or it doubles. So, the pressure change can be expressed as an increase of two times the original pressure.

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Answer:

Frog, shark, snake, Lion, tortoise, salamander, ostrich

Answer:

The person above me is correct it is frog, shark, snake, Lion, tortoise, salamander, ostrich

Explanation:

Answer:

Water is the solvent

Both the ethanol and the hydrogen peroxide are the solute

Explanation:

Both the hydrogen peroxide and ethanol are sisobable in water.

There are 0.05 moles of ethanol.

1 litreof water contains 55.55 moles of water.

0.2 g of hydrogen peroxide contains 0.2/34 = 0.0059 moles of hydrogen peroxide (the 34 is the molar mass of hydrogen peroxide).

Since there are more moles of water, water becomes the solvent and the other two liquids dissolve in it.

The specific heat of the metal, given the data from the question is 0.60 J/gºC

Data obtained from the question

The following data were obtained from the question:

   Mass of metal (M) = 74 g

   Temperature of metal (T) = 94 °C

   Mass of water (Mᵥᵥ) = 120 g

   Temperature of water (Tᵥᵥ) = 26.5 °C

   Equilibrium temperature (Tₑ) = 32 °C

   Specific heat capacity of the water (Cᵥᵥ) = 4.184 J/gºC

How to determine the specific heat capacity of the metal

The specific heat capacity of the sample of gold can be obtained as follow:

According to the law of conservation of energy, we have:

Heat loss = Heat gain

MC(T –Tₑ) = MᵥᵥC(Tₑ – Tᵥᵥ)

74 × C(94 – 32) = 120 × 4.184 (32 – 26.5)

C × 4588 = 2761.44

Divide both side by 4588

C = 2761.44 / 4588

C = 0.60 J/gºC

Thus, the specific heat capacity of the metal is 0.60 J/gºC

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

The net ionic equation for the given process is

Cu + 4HNO3 → Cu(NO3)2 + 2NO2 + 2H2O

Concentrated nitric acid oxidizes copper metal to copper ions. The balanced chemical equation for this reaction is as follows.

3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O

The net ionic equation is obtained by eliminating spectator ions from the balanced ionic equation. Only the species that take part in the reaction are included in the net ionic equation. The complete ionic equation is obtained by writing all the soluble compounds as ions.

3Cu + 8H+ + 8NO3- → 3Cu2+ + 6NO3- + 2NO + 4H2O

Only Cu2+ and NO3- ions are changing from reactants to products, so they are included in the net ionic equation.

The net ionic equation is as follows.

Cu + 4HNO3 → Cu(NO3)2 + 2NO2 + 2H2O.

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In the picture representation of electromagnetic waves,

a) Lowest frequency - C

b) Second Highest energy - A

c) Highest energy - B

d) Shortest wavelength - B

Wavelength can be defined as the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire. In wireless systems, this length is usually mentioned in meters (m), centimeters (cm), or millimeters (mm).

If the wavelength of electromagnetic waves is low, the frequency of a wave is also low and the energy is low.

If the wavelength of electromagnetic waves is short, the frequency of a wave is also high and the energy is high.

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Answer: The statement they have one electron in the outermost electron shell. These are very active metals and easily lose their single valence electron, is true.

Explanation:

Metals are the species which tend to lose electron(s) to acquire stable noble gas configuration.

Elements which tend to lose a single electron in order to acquire stability are active in nature because losing one electron is more easy as compared to losing two or more electrons.

For example, atomic number of sodium is 11 and its electronic distribution is 2, 8, 1.

Since, it contains only one valence electron and by losing it sodium will acquire stability. Hence, sodium is a very reactive metal.

Thus, we can conclude that the statement they have one electron in the outermost electron shell. These are very active metals and easily lose their single valence electron, is true.

The pH of the 30 mL solution with 9.8 mg of phosphoric acid is approximately 2.0.

The dissociation of phosphoric acid and its impact on the concentration of H+ ions in the solution must be taken into account in order to calculate the pH of a solution containing phosphoric acid. As a triprotic acid, phosphoric acid (H3PO4) has the capacity to release three protons (H+) in succession.

The mass of phosphoric acid must first be converted to moles. 97.99 g/mol is the molar mass of phosphoric acid.

9.8 mg equals 9.8 10(-3) g moles of H3PO4 are equal to 9.8 10(-3) g / (97.99 g/mol) = 9.99 10(-5) mol.

Phosphoric acid is triprotic, which means that for every mole of phosphoric acid, three moles of H+ ions are released.

2.997 10(-4) mol = 3 (9.99 10(-5) mol) = moles of H+ ions

The solution has a 30 mL volume, or 0.03 L, in comparison.

H+ ion concentration is equal to (moles of H+ ions) / (litres of solution volume).

H+ ion concentration: (2.997 10(-4) mol/0.03 L) = 9.99 10(-3) M

We can use the following formula to determine pH:

pH = -log(H+)

pH = -log(9.99 × 10^(-3))

pH ≈ 2.0

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Answer:

Boiling of pure water is not a chemical reaction.

It is a physical change from liquid state to gaseous state.

Explanation:

Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.

The weight of the 3 lb roast purchased by the housewife is 1,360.78 grams.

The weight of an object is the force acting on the object due to gravity.

The weight of an object varies from place to place across the globe due to difference in acceleration due to gravity.

1 lb ------------> 453.592 grams

3 lb ------------> ?

= (3 x 453.592)

= 1,360.78 grams

Thus, the weight of the 3 lb roast purchased by the housewife is 1,360.78 grams.

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The Tables that clearly show what you have learned in this lab:

Data is described as a collection of discrete values that convey information, describing the quantity, quality, fact, statistics, other basic units of meaning, or simply sequences of symbols that may be further interpreted.

In most cases,  we can also  use a dichotomous key as it helps in the  classification of  objects by sorting it out with Yes and No questions, until every object is single.

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Answer:

See Explanation

Explanation:

If we consider the conductivity values of group A compounds, we will notice that all group A compounds all possess a very high conductivity values each.

These high conductivity values are consistent with ionic compounds which completely dissociate in solution thereby making mobile ions available.

Hence, group A compounds are ionic and completely dissociate in solution.