What property is shown on the y-axis of an H-R diagram?
A. luminosity
B. mass
C. temperature
D. apparent magnitude

Answer: .5m

Explanation:

The number of protons in an atom of an element is indicated by its atomic number in periodic table. In a neutral atom there are equal number of electrons and protons.

An atom is composed of electrons, protons and neutrons. Protons and neutrons are located inside the nucleus. Electrons are revolving around the nucleus through circular paths of fixed energies.

The number of protons in an atom is called its atomic number. Each element have thus different atomic numbers which helps to identify their electronic properties.

For a neutral atom,the number of electrons and protons are equal. The sum of number of protons and number of neutrons is called mass number of the atom.

In the periodic table, From left to right in a period the atomic number increases by one unit. Thus, elements are arranged in the increasing order of atomic number.

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Answer:

43

a) 6.730 x 10^-4

b) 5.0 x 10^4

c) 3.010 x 10^-6  

44

a) 7050. g

b) 40000500. mg

c) 2350.0 mL

Nuclear fusion in stars, such as our Sun, produces energy through the fusion of light atomic nuclei, mainly hydrogen, into heavier nuclei like helium. This fusion process releases a tremendous amount of energy.

Within the core of a star, where temperatures and pressures are extremely high, nuclear fusion takes place. The collisions between hydrogen atoms at such high temperatures provide the necessary energy to overcome electrostatic repulsion, enabling the fusion process.

In the proton-proton chain, the most common fusion process in stars, hydrogen nuclei combine to form helium nuclei through several reactions. The conversion of a small fraction of mass into energy, as described by Einstein's mass-energy equivalence, results in the release of energy in the form of gamma rays.

These high-energy photons interact with matter, gradually transforming into light and heat. This energy release sustains the star's stability by countering gravitational collapse and powers its luminosity for billions of years.

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Answer:

1) Pure water can conduct electricity because a small proportion of its molecules dissociate into ions . The two ions formed in water are, hydrogen ions, H +, and hydroxide ions, OH -.

2) dynamic equilibrium

Explanation:

I hope this helps!

From highest to lowest atomic radius:

Potassium > Lithium > Carbon > Boron > Fluorine.

Atomic number is the number of protons found in the nucleus of an atom, which determines the element and its unique properties. It is denoted by the symbol "Z" and is listed in the periodic table of elements along with the element's symbol, name, and atomic mass.

The nucleus is the central core of an atom, composed of protons and neutrons, which are collectively known as nucleons. It is located at the center of the atom and contains almost all of its mass. The number of protons in the nucleus determines the identity of the atom and is referred to as the atomic number. The nucleus is held together by the strong nuclear force, which is one of the four fundamental forces of nature.

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Answer:

The quantity of salt is "957 lb". A further explanation is given below.

Explanation:

(1)

As we know,

1 hour 40 Min

= 60 min + 40 min

= 100 min

Salt water is going in at the rate of 2 gal/min

Salt water went into the tank in 100 min will be:

= \(2 \ gal/min\times 100 \ min = 200 \ gal\)

We have 1.92 lb of salt per gal.

In 200 gal, salt went in 1 hour 40 min will be:

= \(1.92 \ salt/gal\times 200 \ gal\)

= \(384 \ lb\)

Now,

ft3 = 7.5 gal

The density of solution will be:

= \(\frac{71.8 \ lb}{7.5 \ gal}\)

= \(9.57 \ lb/gal\)

The solution went out in 100 min 1920 lb as well as going out at 19.2 lb per min.

= \(\frac{1920 \ lb}{9.57 \ lb/gal}\)

= \(200 \ gal\) (salt went out)

The salt remained in the tank at the end of 1 hour 40 min i.e.,

= \(384 - 200\)

= \(184 \ lb\)

(2)

As well as the upper limit for the no. of pounds for continues stirring indefinitely per 100 gal will be:

=  \(957 \ lb\)

Answer:

are there answer choices with the question?

Explanation:

sorry im a little confused

Answer:

A

Explanation:

The formula for the compound that forms between lithium and each polyatomic ion is \(Li_{2}CO_{3}\), \(Li_{3}PO_{4}\), \(Li_{2} HPO_{4}\) and \(CH_{3}COOLi\).

A substance made up of two or more different chemical elements together in a certain ratio is known as a compound in chemistry. When the elements interact with one another, chemical bonds are formed that are difficult to break.

Only a few of the elements on the periodic table have a second letter that is lowercase after their initial capital letter. Therefore, you can tell an ion is polyatomic if it contains two capital letters together.

So, from the question

The compound that lithium will form with carbonate is \(Li_{2}CO_{3}\)

The compound that lithium will form with phosphate is \(Li_{3}PO_{4}\)

The compound that lithium will form with hydrogen phosphate is \(Li_{2} HPO_{4}\)

The compound that lithium will form with acetate is \(CH_{3}COOLi\)

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Answer:

depending on how you change the angle on the ramp the kanetic energy can go up or down depending on how u angle the ramp

Explanation:

Answer:

Riding a bike or walking instead of driving.

Reduce the number of trips you take in your car.

Avoid using gas-powered lawn and garden equipment.

Buying fewer things that are manufactured using fossil fuels.

Explanation:

hope this helps XD

Answer:

2 electrons.

Explanation:

A balanced chemical equation always obeys law of conservation of mass.

A  balanced chemical equation generally obeys to law of conservation of mass. As per this regulation the mass of items should be equivalent to the mass of reactants. A response is supposed to be adjusted when the complete mass of particles on the two sides of the substance response is equal.According to the law of conservation of mass, the mass of the items in a synthetic response should rise to the mass of the reactants.

The law of conservation of mass is helpful for various computations and can be utilized to tackle for obscure masses, such how much gas consumed or delivered during a reaction.They should submit to the Law of conservation of Mass that expresses that matter can't be made or obliterated, it is saved. The mass of the reactants should rise to the mass of the products.Thus, the mass of substances created in a synthetic response is consistently equivalent to the mass of responding substances. Consequently, you really want to have a similar number of each kind of component on each side of a synthetic condition. This is the entire reason for adjusting a synthetic condition.

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Answer:

its B

Explanation:

The limiting reactant​ : Fe

Reaction

3Fe + 4H₂O ⇒ Fe₃O₄ + 4H₂

mass of H₂O = 10 g

mol H₂O (MW=18 g/mol) :

\(\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{10}{18}=0.56\)

mass of Fe = 16.8 g

mol Fe(MW=56 g/mol) :

\(\tt mol=\dfrac{16.8}{56}=0.3\)

Limiting reactant : the smallest ratio between mol : reaction coefficient

Fe :

\(\tt \dfrac{0.3}{3}=0.1\)

H₂O :

\(\tt \dfrac{0.56}{4}=0.14\)

Fe as limiting reactant

Answer:

Oxygen

Explanation:

the difference between DNA and RNA is that DNA is missing one Oxygen atom.

The pressure required to reduce 50 mL of a gas at standard conditions to 20 mL at a temperature of 23 °C is 10.656 atm. To solve this problem, the ideal gas law is used.

The ideal gas law is a fundamental equation of state that relates the pressure, volume, temperature, and number of moles of an ideal gas. The ideal gas law is expressed mathematically as:

PV = nRT

At standard conditions (STP), the volume of 50 mL of a gas is equivalent to 0.050 L, and the temperature is 273 K. We can use this information to find the initial number of moles of the gas:

n₁ = P*V₁/R*T₁= P(0.050 L)/(0.08206 L·atm/mol·K)(273 K) = P/2.4844

where V₁ = 0.050 L, R = 0.08206 L·atm/mol·K, and T₁ = 273 K.

To reduce the volume to 20 mL (0.020 L) at a temperature of 23°C (296 K), we can rearrange the ideal gas law equation and solve for the required pressure:

P2 = n₁*RT₂/V₂ = (P/2.4844)(0.08206 L·atm/mol·K)(296 K)/(0.020 L) = 10.656P

where T₂ = 296 K and V₂ = 0.020 L.

Therefore, the pressure required to reduce 50 mL of a gas at standard conditions to 20 mL at a temperature of 23°C is:

P₂ = 1 atm × 10.656 = 10.656 atm

Thus, the pressure required to reduce the volume of the gas is 10.656 atm.

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Answer:

Zn + 2HCl => ZnCl2 + H2

Explanation:

This equation represents salt formation or salt preparation. Thus not a neutralization reaction.

Answer:

A versatile Ideal Gas Laws calculator with which you can calculate the pressure, volume, quantity (moles) or temperature of an ideal gas, given the other three. Free online gas law calculator a.k.a. PV = nRT calculator which accepts different input metric units such as temperature in celsius, fahrenheit, kelvin; pressure in pascals, bars, atmospheres; volume in both metric and imperial units

Explanation:

Answer:

jbgnbvjbvn v ncbncjbgnbhjfjhfjhfjbfihfjh

Answer:

Ionic bonding happens when an atom of an element gives one or more of its electrons to the other element's atom..it usually takes place between metal and non metal atoms...like in NaCl, Na gives its valence electron to chlorine and completes its own octet. Chlorine accepts the electron and completes its own octet too...but now both the atoms have an opposing charge and hence they attract each other to form an IONIC bond.

Ionic bonds are the strongest of the bonds...here complete transfer of electrons takes place unlike covalent bonds.

HOPE IT HELPED..

:)

Answer:

The electrostatic interaction between an anion and cation

Answer:

Sodium chlorate

Explanation:

I searched it up

Can I pls have a brainliest Pls

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Answer:

Physics is a natural science that involves the study of matter and its motion through space and time, along with related concepts such as energy and force. More broadly, it is the study of nature in an attempt to understand how the universe behaves.

Explanation:

the hybridization of the nitrogen atom in NH2 is sp2.

The hybridization of the nitrogen atom in the cation NH2 can be explained by considering the valence electrons of nitrogen. Nitrogen has five valence electrons, and in NH2, one of these electrons is used to form a bond with the hydrogen atom, leaving four electrons.

To determine the hybridization of the nitrogen atom in the NH2+ cation, follow these steps:

1. Identify the nitrogen atom's valence electrons. Nitrogen has 5 valence electrons.
2. Add the number of hydrogen atoms bonded to nitrogen (2 in this case).
3. Add any extra electrons due to the charge. Since it's a positive cation (NH2+), we need to subtract one electron.

Now, the total number of electrons in the valence shell is 5 (from nitrogen) + 2 (from the hydrogens) - 1 (from the positive charge) = 6 electrons.

4. Divide the total number of electrons by 2 to get the electron pairs: 6 electrons ÷ 2 = 3 electron pairs.

5. Determine the hybridization based on the number of electron pairs. In this case, there are 3 electron pairs:

- 2 pairs are used for bonding with the hydrogen atoms.
- 1 pair is a lone pair on the nitrogen atom.

The hybridization that corresponds to 3 electron pairs is sp2. Therefore, the hybridization of the nitrogen atom in the NH2+ cation is sp2.

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Skeletal muscle was the Effector in the reaction time test and motor response reflects the muscular component of reaction time.

The Effector in the reaction time test was the skeletal muscle in the finger which is used to press the button. muscle and glands produces a specific response to a stimuli's and the motor response was reaction time test is the time between electromyographic activity and movement and the motor response is the response which reflects the skeletal muscle component of reaction time.

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The molarity of NaOH is \(0.24009 \mathrm{M}$\).

This is the formula for molarity:

\(\text { molarity of } \mathrm{NaOH}=\frac{\text { number of moles of } \mathrm{NaOH}}{\text { volume of } \mathrm{NaOH} \text { solution }(\mathrm{L})}$$\)

First, we need to find the number of moles of \($\mathrm{NaOH}$\) :

\($K H P$\) being "monoprotic" mean s that one mole of KHP is one equivalent. Basically, 1 molecule of KHP only donates \($1 H^{+}$\) ion.

We also know that\($\mathrm{NaOH}$\) is a monoprotic base, because there's only one \($\mathrm{OH}^{-}$\) ion in its chemical formula.

Therefore, 1 mole of KHP will correspond to 1 mole of \($\mathrm{NaOH}$\) in a neutralisation reaction.

In other words, 1 mole of \($\mathrm{NaOH}$\) will neutralise 1 mole of \($\mathrm{KHP}$\).

The number of moles of KHP that was neutralised was:

\($\frac{1.25}{39.098+1.008+8 \times 12.01+4 \times 1.008+4 \times 16}$\)

= 0.00612 moles

Because the mole ratio of K H P to N a O H is 1 : 1 , 0.00612moles of N a O H must have neutralised 0.00612 moles of K H P .

Then, we need to find the volume of the N a O H solution. This is pretty simple, actually, because it was given to us in the question: 28.05  mL , or 0.02549 L .

Finally, we just need to plug these values into the formula for molarity:

molarity of \($\mathrm{NaOH}=\frac{\text { number of moles of } \mathrm{NaOH}}{\text { volume of } \mathrm{NaOH} \text { solution }(\mathrm{L})}$\)

molarity of \($\mathrm{NaOH}=\frac{0.00612 \mathrm{~mol}}{0.02549 \mathrm{~L}}$\)

molarity of \($\mathrm{NaOH}=0.24009 \mathrm{M}$\)

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The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.085 m, it takes 26 min for it to decrease to 0.055 m.


The half-life of a first-order reaction is the time it takes for the concentration of the reactant to decrease by half. In this case, the half-life is 13 min.

To find the time it takes for the reactant to decrease from 0.085 m to 0.055 m, we need to find the number of half-lives.

First, we find the difference in concentration: 0.085 m - 0.055 m = 0.03 m.

Then, we divide this difference by the initial concentration to find the fraction remaining: 0.03 m / 0.085 m = 0.3529.

Next, we use the equation t = (0.693/k) * (1/n), where t is the time, k is the rate constant, and n is the number of half-lives.

Substituting the given values, we have 13 min = (0.693/k) * (1/n).

Solving for n, we find n = (0.693/k) / 13 min.

Now we can substitute n back into the equation:

t = (0.693/k) * (1/(0.693/k) / 13 min).

Simplifying, we get t = 26 min.

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MOG-AB associated demyelinating disease is a condition that resembles typical multiple sclerosis (MS) but involves the presence of anti-MOG antibodies.

Expanding anti-MOG testing is crucial in diagnosing and managing MOG-AB associated demyelinating disease for several reasons. Firstly, distinguishing this condition from typical MS is essential as their treatment approaches differ. While typical MS is primarily managed with disease-modifying therapies, MOG-AB associated demyelinating disease often requires immunosuppressive agents to target the pathogenic antibodies. Accurate diagnosis prevents unnecessary treatments and improves patient outcomes.

Additionally, MOG-AB associated demyelinating disease can manifest with atypical clinical features and different radiological patterns compared to typical MS. Therefore, comprehensive testing for anti-MOG antibodies helps identify patients who may benefit from alternative diagnostic and therapeutic strategies.

Furthermore, recognizing the presence of anti-MOG antibodies aids in predicting disease course and prognosis. Patients with MOG-AB associated demyelinating disease may have a higher likelihood of relapses and optic neuritis but a lower risk of developing long-term disability compared to MS patients. Tailoring management plans based on this information allows for personalized care.

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