What laws do astronomers use to indirectly learn about stars?​

Answer:

oceanic ridge

The youngest rocks on the ocean floor are located at the oceanic ridge, an underwater mountain range formed from the spreading of tectonic plates in.

Explanation:

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The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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Answer:

A. 1s²2s²

B. 1s²

C. 1s²

D. 1s²2s²2p⁶

Explanation:

The valency electron is the outer electron of an element. The valency electron resides in the outermost region of the shell.

Using the general configuration for the first 20 elements 2 8 8 2 the valency electrons can be identified.

A. 1s²2s²2p⁶3s² . The valency electron here are 2p⁶ and 3s² . Removing the valency electron we have 1s²2s²

B. 1s² 2s² 2p⁶. After removing the valency electron the configuration will be 1s².

C.1s²2s². After removing the valency electron the configuration will be 1s²

D.1s²2s²2p⁶3s¹. Removing the valency electron the electron configuration will be 1s²2s²2p⁶

To determine whether a hot or cold pack is effective, safe, and easy to use, several criteria can be considered: effectiveness, safety, and ease of use.

1. Effectiveness: The effectiveness of a hot or cold pack is evaluated based on its ability to relieve pain and reduce inflammation. An effective pack should provide the desired level of relief without causing any adverse effects or complications.

2. Safety: Safety is paramount when using any therapeutic tool. A hot or cold pack should not cause harm to the user. This means it should be designed in a way that prevents burns, bruises, or abrasions to the skin. Proper temperature control is essential to ensure the pack is not too hot or too cold. Sufficient padding should be provided to prevent direct contact with the skin.

3. Ease of use: A hot or cold pack should be user-friendly. It should be easy to handle and should not be overly bulky or heavy. Clear and concise instructions for use should be provided, and the pack should be easy to clean and store. Portability is also important so that the pack can be conveniently carried around.

For a hot or cold pack to be considered effective, safe, and easy to use, it should provide relief from pain and inflammation without causing harm. The pack should have appropriate temperature control and sufficient padding to protect the skin. It should be user-friendly, with clear instructions, easy handling, and convenient portability. Additionally, the pack should be easy to clean and store. By considering these criteria, one can determine whether a hot or cold pack meets the requirements for effective, safe, and easy pain management.

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The balanced equation for the reaction is

3CuCl₂(aq) + 2Al(s) = 2AlCl₃(aq) + 3Cu(s). The correct option is - D) 3CuCl2(aq) + 2Al(s) = 2AlCl3(aq) + 3Cu(s)

From the question,

We are to determine which of the given equation for the described reaction is balanced.

The described reaction is the reaction between aqueous copper (II) chloride and solid aluminum to produce aqueous aluminum chloride and solid copper.

That is,

CuCl₂(aq) + Al(s) = AlCl₃(aq) + Cu(s)

Now, we will balance the above equation, using the smallest whole number coefficients

The balanced equation for the reaction is

3CuCl₂(aq) + 2Al(s) = 2AlCl₃(aq) + 3Cu(s)

Hence, the balanced equation for the reaction is

3CuCl₂(aq) + 2Al(s) = 2AlCl₃(aq) + 3Cu(s). The correct option is - D) 3CuCl2(aq) + 2Al(s) = 2AlCl3(aq) + 3Cu(s)

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Answer:

Explanation:

given mass=220 kg

acceleration=5 m/s2

F=ma

F=220*5

F=1100N

The force from the motorbike's engine, given the data is 1100 N

The force from the bike's engine can be obtained as illustrated below:

Force = mass × acceleration

Force = 220 × 5

Force = 1100 N

Thus, the force from the bike's engine is 1100 N

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The following presents the correct order of buttons to press on a scientific calculator to enter 2.8 107 is[2] [8] [EE] is 2.8×10⁷

In the scientific calculator it is an electronic calculator either desktop or handheld used to design to perform mathematical operation

Here given data is  2.8 107

And in the scientific calculator the EE means the raise to power it means in the given question 2.8 107 means the 10 raise to power it means correct numbers is  2.8×10⁷ and it is come only in the scientific calculator and the correct order to press the button is [2] [8] [EE]

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Moving across the period the elements gain a proton and gain a valence electron.

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SIADH is a condition in which high levels of a hormone causes the body to retain water and Hyponatremia occurs when blood sodium level is 123 meq/L.

Treatment that is prescribed for SIADH is fluid and water restriction. Certain medications that inhibit the action of ADH is also included in treatment.

Blood sodium level is said to be normal if it's 135 to 145 milliequivalents per liter. It is hyponatremia, if sodium level is below 135 mEq/L, then

When the sodium level in the blood is too low then extra water goes into your cells and makes them swell. Treatment may include: Intravenous sodium solution to slowly raise the sodium levels in your blood and also some medications to manage the signs and symptoms of hyponatremia.

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Answer:

nickel, cobalt would decrease in size when it became an iron

Answer:

A transition from one accepted theory to another or from one employed method to another.

Explanation:

Answer:

Strange question. All the answers are D

Explanation:

I don't exactly know how you should answer this. I can find the charge on Chromium. The only hope is that they are all the same.

[Cr(OH)_-6]^-3

x - 6 = -3   Add 6

x = -3 + 6

x = 3

======

CrO4 ^-2

x - 4*2 = - 2   add 8

x = -2 + 8

x = 6

================

Water has no effect on the charge. The chromium has a charge of +2

To keep burning, fires require oxygen. Carbon dioxide is used in certain fire extinguishers to put out flames. Explanation: Because magnesium is higher on the reactivity scale than carbon, it is more reactive and eliminates oxygen from carbon dioxide (to give carbon and magnesium oxide).

Answer:+6

Explanation:Oxygen always has an ON of -2 so when there’s O7 the total is -12. Sodium is in group 1 so has an ON of +1 that means with two of them it’s overall ON is +2. When you combine the two that equals -12 but you want it to equal 0. So it would be +12. Considering there are two chromium present you would divide that by 2 making the answer +6.

The balanced equation for the overall cell reaction in the given galvanic cell is:

2Br-(aq) + Cl2(g) -> 2Cl-(aq) + Br2(l)

In this galvanic cell, inert electrodes, such as platinum (Pt), are required at both the anode and the cathode. Here's why:

At the anode: The anode half-reaction involves the oxidation of bromide ions (Br-) to form bromine (Br2). The half-reaction is:

2Br-(aq) -> Br2(l) + 2e-

Since bromine (Br2) is in its liquid state, it cannot be used as an electrode. Therefore, an inert electrode, like platinum (Pt), is used to allow the transfer of electrons during the oxidation process.

At the cathode: The cathode half-reaction involves the reduction of chlorine gas (Cl2) to chloride ions (Cl-). The half-reaction is:

Cl2(g) + 2e- -> 2Cl-(aq)

Similarly, chlorine gas (Cl2) cannot be used directly as an electrode, so an inert electrode, such as platinum (Pt), is used to facilitate the electron transfer during the reduction process.

In summary, inert electrodes (Pt) are required at both the anode and cathode in this galvanic cell to provide surfaces for electron transfer during the redox reactions.

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b. false

Eugenol is typically extracted from cloves using methods such as steam distillation or solvent extraction, but not with CO2 extraction. CO2 extraction is a technique commonly used to extract essential oils from various plant materials, but it is not the preferred method for isolating eugenol from cloves.

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Answer:

9 1/3  liters

Explanation:

N2 + O2 = 2 NO

Find mole weights from table of elements

N =14

O =~16       30 gm is a mole

22.4 l / mole for gases at STP

22.4 * 25/30 = 18 2/3 Liters  of NO  

   but since Nitrogen is N2 it will take 1/2 s much = 9 1/3

*** EDITED ***

According to the stoichiometry and STP conditions if  25.0 g of NO are produced 2269 liters  of nitrogen gas are used.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.1 mole of nitrogen gives 2 moles of NO, thus as per ideal gas equation which on substitution gives V=1×8.314×273/1=2269.722 liters.

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Answer: b. Chromatography

Explanation:

Chromatography procedure will be used to separate the pigments in the ink.

To carry out this procedure, a small ink-dot is placed at the end of a filter paper. This ink-dotted end of the filter paper is then placed in a solvent.

As the solvent moves up the filter paper, it dissolves the ink mixture and spreads its component pigment across the paper.

In a shallow cylindrical lake with a radius of 4 km and an average water height of 5 m, a type A exhaust basin recorded a total water loss of 4.5 cm during a summer month.

The task is to calculate the evaporation of the lake and the volume of lake water in cubic meters for that specific time period, assuming an evaporation coefficient of 0.7. To calculate the evaporation of the lake, we first convert the recorded water loss from centimeters to meters. The total water loss is 4.5 cm, which is equal to 0.045 meters.

The evaporation from the lake can be determined by multiplying the water loss by the evaporation coefficient. In this case, the evaporation coefficient is given as 0.7. So, the evaporation from the lake is calculated as:

Evaporation = Water loss * Evaporation coefficient

Evaporation = 0.045 m * 0.7 = 0.0315 m

Therefore, the evaporation of the lake during the specified time period is 0.0315 cubic meters.To calculate the volume of lake water, we need to consider the shape of the lake, which is a shallow cylinder. The formula for the volume of a cylinder is:

Volume = π * radius^2 * height

Given that the radius of the lake is 4 km (4000 m) and the average water height is 5 m, we can calculate the volume of the lake as:

Volume = π * (4000 m)^2 * 5 m = 251,327,412 m^3

Therefore, the volume of lake water for the specific time period is approximately 251,327,412 cubic meters.

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Mass of evaporating dish and cover=19.50 grams mass of evaporating dish, cover and lead = 22.45 grams mass of evaporating dish, cover and lead oxide product=22.90 grams.The empirical formula for the product is PbO.

An empirical formula is a compound's chemical formula that only specifies the ratios of the elements it contains and not the precise number or arrangement of atoms. This would be the compound's element with the lowest whole number ratio.

Given:

A.Dish + Cover = 19.50 gram

B.Dish + Cover + lead = 22.45 grams grams

C.Dish + Cover + lead oxide = 22.90 grams

Mass of lead reacted = B-A

= 22.45 grams - 19.50 gram

= 2.95 gram

No. of moles of lead = 2.95/207.2

= 0.01g/mol

Mass of lead oxide = C-A

= 22.90 - 19.50

= 3.4 gram

Mass of oxygen in lead oxide = 3.4 - 2.95

= 0.45g

Number of moles of oxygen = 0.45/16

= 0.028moles

Therefore, it is PbO.

Thus, the empirical formula for the product is PbO.

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Reaction time is the amount of time it takes for a person or a system to respond to a stimulus or a change in the environment. In other words, it is the time interval between the onset of a stimulus and the initiation of a response.

Reaction time can be measured in different contexts, such as in human performance, neuroscience, sports, and engineering. For example, in human performance, reaction time is often used to assess cognitive and motor skills, such as reaction time in driving, reaction time in decision-making, or reaction time in sports.

In neuroscience, reaction time is used to study neural processing and the speed of information processing in the brain. Reaction time can be influenced by various factors, such as age, gender, attention, arousal, motivation, and the complexity of the task.

Reaction time can be improved with practice and training, and it can also be affected by various diseases and disorders, such as Parkinson's disease, multiple sclerosis, or attention deficit hyperactivity disorder (ADHD).

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The benefit of the release of carbon dioxide have on kelp and other producers is its ability to absorb and lock away huge quantities of carbon dioxide.

Kelp is a type of seaweed which being developed for its nutritional value. Kelp is high in antioxidants, including carotenoids and flavonoids, that help fight against disease-causing free radicals. Antioxidant minerals, such as manganese and zinc, help combat oxidative stress and may help protect cardiovascular health and prevent cancer.

Kelp has an ability to absorb and lock away huge quantities of carbon dioxide. Seaweed absorbs CO2 more effectively than trees. It also improves water quality by extracting harmful nutrients such as nitrogen from the sea.

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When covalent bonds form between hydrogen and oxygen atoms in a water molecule two hydrogen atoms share their electrons with an oxygen atom.

When two atoms exchange one or more pairs of electrons, a covalent bond is formed. These electrons are being drawn to the two atomic nuclei at the same time. A covalent bond is formed when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions. There are two types of bonds that an atom can form with other atoms: covalent and ionic. A covalent bond is formed when two or more atoms share electrons. Ionic bonds can form when two or more ions come together and are held together by charge differences.

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Growth hormon somatotropin