A solution of unknown pH was tested with two indicators. Methyl orange turned yellow and methyl red turned red. Which of these could be the pH of the solution?

The graph that best demonstrates the general relationship between mass and temperature, similar to the trend of thermal energy absorbed by sand and water samples, is the first graph on the left.

The first graph on the left shows a negative correlation between mass and temperature, indicating that as mass increases, the temperature decreases.

This relationship often reflects how larger masses require more thermal energy to achieve the same temperature increase, which is a typical trend observed in thermal energy absorption experiments with different materials like sand and water.

The other graphs (middle and right) show no correlation and a positive correlation respectively, which do not align with the expected trend.

Ethyl alcohol is the solvent in this mixture because it is the substance present in a larger volume and has dissolved the water.

The substance that is the solvent in a mixture is the one that makes up the majority of the solution and is responsible for dissolving the other substance (solute). In this case, the water is poured into the beaker containing ethyl alcohol, and it's mentioned that there are 600 mL of ethyl alcohol in the beaker.

Therefore, ethyl alcohol is the solvent in this mixture because it is the substance present in a larger volume and has dissolved the water. Water is the solute in this case, as it has been added to the ethyl alcohol. The fact that water is a polar compound is not relevant in determining which substance is the solvent; the solvent is typically the substance in greater quantity in the solution.

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Answer:

2; Single Displacement

Explanation:

C. The design would not be cost-efficient; the plane would require more fuel due to increased thrust from higher drag.

Adding protrusions to the wings of an airplane, such as fuel pods and missiles, will likely result in increased drag, impacting the speed, fuel efficiency, stability, maneuverability, and safety of the airplane.

The likely drawback to adding protrusions to the wings, such as fuel pods, water tanks, and missiles, is increased drag. Drag is the resistance encountered by an object when it is moving through a fluid, such as air. Any protrusions on the wings will create extra surfaces that disrupt the smooth flow of air over the wings, resulting in increased drag.

Increased drag can have several negative effects on the airplane. It can reduce the airplane's speed and fuel efficiency, making it less economical to operate. Additionally, increased drag can make the airplane less stable and maneuverable, affecting its handling and safety.

Therefore, while the extra storage may be beneficial, the increased drag is a likely drawback of this design.

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The answer is D

hope this isnt too late

The movement of tectonic plates buries a rock deep inside Earth. Intense heat and pressure change the mineral composition of the rock and transform it into rock as rock A is composed of layers of sediments. Rock B has a fine grainy texture and small crystals.

Minerals are defined as a chemical compound which has a well -defined composition and possesses a specific crystal structure.It occurs naturally in the pure form.

If a compound occurs naturally in different crystal structure then each structure is considered as a different mineral.The chemical composition of a mineral varies depending on the presence of small impurities which are present in small quantities.

Some minerals can have variable proportions of two or more chemical elements which occupy equivalent position in the crystal structure.It may also have variable composition which is split into separate species.

Physical properties of minerals include color,streak, luster,specific gravity and cleavage.

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Sublimation is best described as a solid converting to a gas. Sublimation occurs when a substance moves directly from the solid to the gas phase without first passing through the liquid phase.

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To determine a star's temperature, measuring its absorption spectrum or emission spectrum is best, as the Doppler shifts within the lines of the spectrum hint at the star's temperature. Option C, D is correct.

The colors and spectral classes obtained from these spectra can help estimate the star's temperature. The spectrum of a star reveals the specific wavelengths of light that the star emits or absorbs.

The emission spectrum reveals the wavelengths of light a star emits, which we can use to estimate the star's temperature. Similarly, by analyzing the absorption spectrum, which consists of dark lines superimposed on the continuous spectrum of the star, temperature can also be inferred.

The absorption spectrum is specifically of interest because the precise measurement of the width of absorption lines allows for determining the temperature; these Doppler shifts in the absorption lines are prominent and easier to detect, compared to shifts in the continuous spectrum.

Hence, C. D. is the correct option.

The complete question is:

If you wanted to determine the temperature of a star which measurement would you maker ?

A) Refraction

B) Doppler shift

C) emission spectrum

D) absorption spectrum

Answer:

Explanation:

Answer:

C: Single replacement

Explanation:

The heat needed to raise the temperature of 150 g of ice from -30°C to -15°C is 4704 Joules. This uses the fact that the heat absorbed by ice in its solid state is constant (0.50 cal/g °C), and the principle that heat calculations rely on mass, specific heat capacity, and the change in temperature.

In the question, the student needs to find out the amount of heat required to raise the temperature of 150 g of ice from -30°C to -15°C. The task only involves heating ice, while keeping it in solid form as the raised temperatures are still below 0°C. To find the required heat, we can use the formula q = mcΔT, where 'q' is heat, 'm' is mass, 'c' is the specific heat capacity and 'ΔT' is the change in temperature. From the available information, ice absorbs heat at a constant rate of 0.50 cal/g °C. We have to translate this into the SI unit for heat (Joules) as: 1 cal = 4.184 J. Therefore, the specific heat of ice in SI units is: 0.50 cal/g °C * 4.184 J/cal = 2.092 J/g °C.

Substitute the given values into the formula: q = 150 g * 2.092 J/g °C * 15 °C = 4704 J. Therefore, 4704 Joules of heat is needed to raise the temperature of 150 g of ice from -30°C to -15°C.

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Positron emission = emission of a positron and a neutrino when a proton is convert into a neutron. The total number of particles in the nucleus doesn't change, -1 proton +1 neutron

It's a spontaneous reaction for some nucleus.

eg:

Positron = e+

Neutrino=ve

O-15 --> N-15 + e+ +ve

Electron capture= A nucleus absorb an electron while a proton is convert in a neutron and emit a neutrino. The total number of particles in the nucleus doesn't change, -1 proton +1 neutron

eg:

Al-26 +e- --> Mg-26 + ve

Electron capture and positron emission are two mechanisms to explain the decay of some unstable isotopes. Electron capture is usually observed when the energy difference between the initial and final state is low. Mainly because of the larger amount of kinetic energy need for the expulsion of two particles with the positron emission mechanism.

The weight of an object with a mass of 40 kilograms on the Moon would be 66.8 Newtons, as weight is calculated by multiplying the mass by the lunar gravitational acceleration of 1.67 m/s².

If the mass of an object on Earth is 40 kilograms, and assuming that mass does not change regardless of location, this mass would remain the same on the Moon. However, since weight is a measure of the force of gravity on an object, it will vary depending on the gravitational pull of the body it is on. The gravitational acceleration on the Moon is 1.67 m/s². Therefore, on the Moon, the weight of a 40 kg object would be calculated as follows:

Weight on the Moon = mass × moon's gravitational acceleration

Weight on the Moon = 40 kg × 1.67 m/s²

Weight on the Moon = 66.8 N (Newtons)

So, if an object has a mass of 40 kilograms, its weight on the Moon would be 66.8 Newtons.

Option 3: By removing hydrogen because of fluorine's attraction to hydrogen's nucleus.

The reaction of ethene and halogen generally breaks the carbon-carbon double bond and substitution of halogen on carbon takes place, this is known as halogenation reaction. This is in the case of reaction of ethene with chlorine, bromine and iodine. In the case of fluorine,  due to high electronegativity it get attracts to the nucleus of hydrogen and form hydrogen fluorine gas. Therefore, halogentaion reaction do not take place in the case of ethene and iodine.

Ethene explosively reacts with fluorine to form carbon and hydrogen fluoride gas. The reaction is as follows:

[tex]CH_{2}CH_{2}+2F_{2}\rightarrow 2C+4HF[/tex]

Answer:

Explanation

Answer:

Astatine  are halogens only

Nitrogen  are non metals only

Krypton (Kr) is noble gas only

Chlorine (Cl):  halogen

Sulfur (S)  non metals only

Explanation:

Answer: The correct answer is : 2) Ammonia

Amine :

These are organic compound which are derivatives of ammonia (NH₃) gas . In Amine one or more Hydrogen atom in ammonia are replaced by carbon atom.

The general structure of ammonia as bond between N and carbon . Number of carbons may vary from 1 to 4 .(Image attached )

Example : CH₃-NH₂ , CH₃-NH-CH₃

2) Amides :

These are organic compound in which the Hydroxyl (OH) group of carboxylic acid (COOH) is replaced by amino group (NH₂) . SO they are derivatives of carboxylic group but since they also have amino group , so they can be said as derivatives of ammonia . (image attached )

Example : CH₃-CO-NH2 , CH₃-CO-NH-CH₃ .

Hence it can be said that Amine and Amide are derivaties of ammonia (NH₃)

Amines and amides are derivatives of ammonia. They are formed by a process called substitution in which hydrogen atoms from the ammonia molecule are replaced by other functional groups.

Amines and amides are derivatives of ammonia. These molecules are both derived from ammonia by a process called substitution, where one or more of the hydrogen atoms in ammonia is replaced by other functional groups. For example, in an amine, one or more of the hydrogen atoms is replaced by an alkyl or aryl group. In an amide, one of the hydrogens in ammonia is replaced by a carboxyl group. This substitution leads to the properties that make amines and amides unique.

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