solve this questions please​

A mixture of iodine and sulphur can be separated by adding Carbon disulphide that is (CS₂) then stir the solution and filter it . As sulphur dissolved in CS₂, so it come into filter and got separated from the mixture.

Answer:

Al

Explanation:

Al = Aluminum

Your answer is

true

hope it helps you

Answer:

D

Explanation:

Heat is transfered through space by convection.

Answer:

hydrogen bonding

Explanation:

The two strands of DNA are held together by hydrogen bonds between complimentary nucleotides.

Answer:

because there is not enough pressure to form a crystal in sedimentary rocks. This is my understanding

Explanation:

Please correct me if wrong.

Answer:

I believe your answer is B. Each orbit has a specific energy level.

Hope this helped!

The flame colour produced by metal ions is due to electrons returning to lower energy levels after being excited to higher energy levels.

A flame test is a test used to identify metal ions in solution due to the characteristic colour the flame produces.

Flame colors are produced when the electrons in the metal ions present in the compound move between energy levels after excitation.

The difference in the colour of the flame depends on the difference in the energy levels of the electrons moving.

A solution of Cu(NO3)2 contains Cu2+ ions.

Cu2+ ions gives a deep green coloured flame.

A solution of Na2SO4 contains Na+ ions.

Na+ ions give a golden yellow-coloured flame.

A solution of Li3PO4 contains Li+ ions.

Li+ ions gives a red-coloured flame.

A solution of Ca(C2H3O2)2 contains Ca2+ ions

Ca2+ ions gives a brick red-coloured flame

Therefore, the colour of the flame produced by metal ions is due to electrons returning to lower energy levels after being excited to higher energy levels.

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The percentage of the total energy contributed by fat = 51.59% of fat

The quantity of fat in the hamburger = 36grams

But 1 gram of fat = 9 kcal( standard energy value per gram of fat).

That is , 9kcal = 1 gram

X kcal = 36 grams

cross multiply,

X kcal = 9 × 36

= 324kcal

To calculate the percentage of 324kcal of fat in 628 kcal,

[tex]\% = \frac{324}{628} \times \frac{100}{1} [/tex]

[tex]\% = \frac{32400}{628} [/tex]

% = 51.59% of fat

The percentage of the total energy contributed by fat = 51.59%

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Answer:

Molecules at a higher temperature have higher/more kinetic energy, speed, and momentum compared to molecules at a lower temperature.

Explanation:

Answer: Copper (I) Carbide

Explanation:

Copper is a polyatomic ion, meaning it has multiple charges. Carbon has an outer shell consisting of 4 valence electrons so it can either add or lose 4 electrons so it’s charge can be -4 or +4. As said Copper has multiple charges but they are positive, so in this case Cu4 would be 4 +1 charges compared to C which would be -4. Therefore this is a 4:1 ratio, meaning Cu4C is Copper (I) Carbide

hope this helps :)

Answer: The main difference between the two is their fat content. Heavy cream has slightly more fat than whipping cream. Otherwise, they are nutritionally very similar. You can use them interchangeably in recipes without affecting the taste, although they may lead to different consistencies.

Explanation:

The most helpful feature of the radioisotope americium-241 for the smoke detector to work is its Long half-life.

What is Half-Life?

Half-life is the time required for a quantity to reduce by half to its initial value. The half-life of any radioisotope is represented by [tex]t_{1/2}[/tex] .

Americium-241 (²⁴¹Am) is the most common isotope of americium.

Americium-241 has a half-life of 432 years.

Am-241 decays by emitting alpha particles and gamma radiation to become neptunium-237.

Thus, the most helpful feature of the radioisotope americium-241 for the smoke detector to work is its Long half-life.

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Smoke detectors are the safety devices for fire protection that detects smoke and gives alarms as a warning. The long half-life of the radioisotope would be most practical for the detector.

Radioisotopes are chemical substances that have unstable neutrons, protons and some amount of excess energy. They have a half-life which is the time by which they get reduced or decay to half quantity.

Americium-241 is the radioactive isotope of americium and have a half-life of 432.2 years. It helps in the alarm as the smoke particle disrupt the electric current produced by the isotope and results in the warning of the device to go on.

Therefore, option A. long half-life is the feature that would be most useful for the smoke sensor.

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Answer:

who's asking?

Explanation:

Answer:

Answer A

Explanation:

Because that method is important to help the scientist

It is important for scientists to use the scientific method because The scientific method helps scientists get accurate, repeatable results. Therefore, option A is correct.

The term scientific method is defined as the process of objectively establishing facts through testing and experimentation.

The basic process including making an observation, forming a hypothesis, making a prediction, conducting an experiment and finally analyzing the results.

The Scientific Method is a process used to confirm observations while minimizing observer bias. Its goal is for research to be conducted in a fair, unbiased and quotable manner.

Thus, It is important for scientists to use the scientific method because The scientific method helps scientists get accurate, repeatable results, option A is correct.

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#SPJ2

Answer:

ok

Explanation:

why I needed to give a answer to a question. I want to ask the question. brainly solve this issue. i cant ask questions without answering to 1 questions.

Answer:

Q = mcΔt but this time rearrange to find for c

Explanation:

Q or energy = 78.2J

mass of lead  =  45.6g

Specific heat capacity of lead = ????

Δt = 13°C

Q = mcΔt

Rearrange the equation to find for c

c = Q / m x Δt

c = (78.2) / (45.6) x (13)

c ≈ 0.132 J °C

Your answer is B

Sun and wind are considered renewable energy, meaning that it won't polute the Earth. And as far as I know, the Sun and wind can't really run out. So it can last a very long time!

Hope this helps!

-Daisuke

all of them are right

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The colour of the phenol red-containing solution would shift toward yellow.

Carbon dioxide is a colourless and acidic gas that is found in trace amounts in the atmosphere. When it reacts with water, carbonic acid is formed.

One of the properties of an acid is that it has the ability to turn blue litmus paper to red.

When Carbondioxide is used as a reactant, the phenol red-containing solution will shift toward yellow because the pH of the solution is less than 7 and turns blue as carbon dioxide is consumed and the pH of the solution rises to 7 or greater.

Note that acidity is pH of 0- 6 and basic solutions are from 8 - 14 in a pH scale.

Therefore, the colour of the phenol red-containing solution would shift toward yellow.

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Answer: Aqueous Ammonium Chloride

Explanation: When you disintegrate ammonium chloride crystal in water (H2O), the ammonium chloride compound decomposes into allure component ions: NH4+ and Cl-. The detachment related series of events is: NH4Cl(complete) = NH4+(liquid) + Cl-(liquid).

Answer:

2.52[tex]x10^{23}[/tex] atoms*

Explanation:

[tex]\frac{0.419mol}{1} *\frac{6.02*10^{23}atoms }{1 mol} =2.52238x10^{23}[/tex]atoms

*i put the answer in correct sig figs(significant figures) in case your teacher is like mine and wants answers like that

It's actually true hope it helps.

Answer:

A uniform temperature distribution is a MACROscopic property where the temperature is measured to be the same throughout the volume measured. An ideal gas with a uniform temperature distribution would have a Bellman distribution of kinetic energy of microscopic particles.

Explanation:

I am walter white

Answer:

high kinetic

Explanation:

I just did it

Answer: the answer is high kinetic energy

Explanation:

Heptane is limiting while oxygen is in excess. The mass of carbon dioxide produced would be 9,223.62 grams, while excess oxygen would measure 14,461.12 grams

From the equation of the reaction:

C7H16 + 11O2 --> 7CO2 + 8H2O

Mole ratio of C7H16 to O2 = 1:11

Mole of 3000 g heptane = 3000/100.21

                                           = 29.94 moles

Mole of 25000 g O2 = 25000/32

                                    = 781.25 moles

Thus, O2 is in excess and heptane is limiting.

Mole ratio of heptane and CO2 = 1:7

equivalent mole of CO2 = 29.94 x 7 = 209.58 moles

Mass of 209.58 moles CO2 = 209.58 x 44.01

                                               = 9223.62 grams

Excess mole of O2 = 781.25 - (29.94x11)

                                = 781.25 - 329.34 = 451.91 moles

Mass of 451.91 moles of O2 = 451.91 x 32

                                              = 14,461.12 grams excess oxygen.

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