The Sun is 73% hydrogen and 25% helium. The rest is other elements.
What is the percentage of other elements in the Sun?

Answer:

Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.

Explanation:

i took the test:P

Hope this helps!

The unknown metal X is iron metal as it reacts with copper sulfate solution but does not react with magnesium chloride.

Some metals are very reactive while other metals are less reactive or unreactive. When a more reactive metal is added to the solution of a less reactive metal, then the more reactive displaces the less reactive metal from its solution is known as a displacement reaction.

The general form of a single displacement reaction can be represented as:

\(A + BC \longrightarrow B + AC\)

When iron is placed in copper sulfate (CuSO₄) solution then the blue color of the copper sulfate solution turns a red-brown coating of copper metal deposited on the iron.

\(CuSO_4 (aq)+ Fe (s)\longrightarrow FeSO_4 (aq) +Cu(s)\)

Iron lies above the electrochemical series and is more reactive than copper. So it reacts with copper sulfate but does not give any reaction with magnesium chloride.

Learn more about displacement reaction, here:

https://brainly.com/question/3172917

#SPJ1

Answer: The oxidation state of Al in \(AlH_{3}\) is +3.

Explanation:

The number attained by an atom or substance due to loss or gain of electrons is called oxidation state.

For example, in \(AlH_{3}\) it is known that the oxidation state of hydrogen is -1 as aluminum is a cation so it cannot have an oxidation state as 'minus'.

Whereas hydrogen has the property to act both as a cation and an anion.

Let us assume the oxidation state of Al is x in the compound \(AlH_{3}\).

Hence, oxidation state of Al is calculated as follows.

\(x + 3(-1) = 0\\x - 3 = 0\\x = +3\)

This means that the oxidation state of Al in \(AlH_{3}\) is +3.

Thus, we can conclude that oxidation state of Al in \(AlH_{3}\) is +3.

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.

Answer:

Bias can cause the results of a scientific study to be disproportionately weighted in favor of one result or group of subjects. This can cause misunderstandings of natural processes that may make conclusions drawn from the data unreliable.

Explanation:

Answer:

Would be C

Explanation:

helpig and bringing noice to a persons safety is always the right thing. C is correct, hope this helps

Answer:

6

Explanation:

Magnesium=24

helium= 4

24:4=6

Answer:

The calculated mass of one atom of oxygen-18  is approximately  2.99×10⁻²³ grams

Explanation:

The given mass of an oxygen-18 atom = 18.0042 amu

The definition of the atomic mass unit is the mass equivalent to the mass of one twelfth the atomic mass of one atom of carbon-12. The atomic mass unit is used to express the mass of an isotope of an element

1 amu = 1.66 × 10⁻²⁴ grams

Therefore;

18.0042 amu = 18.0042 ×  1.66 × 10⁻²⁴ grams ≈ 2.99×10⁻²³ grams

The calculated mass of one atom of oxygen-18 ≈ 2.99×10⁻²³ grams

The atomic mass unit can be taken as the mass in grams of one mole of the substance

Therefore, the mass of one mole of the oxygen 18 atom = 18.0042 g

The molar heat of combustion of the organic compound is approximately 283 kJ/mol.

To calculate the molar heat of combustion of the organic compound, we need to determine the heat absorbed by the calorimeter and then divide it by the number of moles of the organic compound.

Number of moles (n) = 0.183 mol

Heat capacity of the calorimeter (C) = 10.5 kJ/oC

Temperature increase (ΔT) = 4.92 oC

First, let's calculate the heat absorbed by the calorimeter using the formula: q = C * ΔT

q = 10.5 kJ/oC * 4.92 oC

q = 51.66 kJ

Now, we can find the molar heat of combustion (ΔH) by dividing the heat absorbed by the calorimeter by the number of moles of the organic compound: ΔH = q / n

ΔH = 51.66 kJ / 0.183 mol

ΔH ≈ 282.62 kJ/mol

Rounding to the correct number of significant figures, the molar heat of combustion of the organic compound is approximately 283 kJ/mol.

Learn more about molar heat from the given link:

https://brainly.com/question/20716582

#SPJ11

Answer:

3MgI2 + Fe2S3 -> 3MgS + 2FeI3

Reaction Type

1.Double Displacement 

2.Oxidation-Reduction

Answer:

Not significant

Explanation:

I just did the test

The product of the reduction of ethyl 4-oxobutanoate with sodium borohydride in ethanol at room temperature for 30 minutes is Ethyl 4-hydroxybutanoate (Option A).

What is ethyl 4-oxobutanoate and what does it look like?

Ethyl 4-oxobutanoate, also known as ethyl acetoacetate, is an organic compound with the chemical formula CH₃C(O)CH₂CO₂C₂H₅. It is derived from acetoacetic acid and is an ester of acetoacetic acid.

Ethyl 4-oxobutanoate is a colorless liquid with a fruity odor.

During the reduction reaction, sodium borohydride (NaBH₄) acts as a reducing agent, donating hydride ions (H-) to the carbonyl group of the ethyl 4-oxobutanoate. This results in the conversion of the carbonyl group (C=O) to a hydroxyl group (OH) and the formation of the corresponding alcohol.

Therefore, the correct product of the reduction of ethyl 4-oxobutanoate with sodium borohydride is Ethyl 4-hydroxybutanoate (Option A).

To learn more about ethyl 4-oxobutanoate,

https://brainly.com/question/28169820

#SPJ4

Answer:

nitrogen

nitrogen oxide

zincflorite

?

potassium oxide

Answer:

CIO- or HCIO. ^_________^

the value of ΔH for the reaction of 18.1 g of hydrogen gas (H2) with excess oxygen to form water at constant pressure is -2,174.524 kJ. Since the value is negative, this indicates that the reaction is exothermic, and releases heat.

The first step is to calculate the number of moles of hydrogen gas (H2) in the 18.1 g sample:

moles of H2 = mass of H2 / molar mass of H2

moles of H2 = 18.1 g / 2.016 g/mol

moles of H2 = 8.98 mol

Since 1 mole of hydrogen gas (H2) releases 241.8 kJ of energy, we can use the following formula to calculate the amount of energy released by 8.98 mol of H2:

ΔH = nΔH_rxn

where n is the number of moles of H2 and ΔH_rxn is the molar enthalpy change for the reaction.

ΔH = 8.98 mol x (-241.8 kJ/mol)

ΔH = -2,174.524 kJ

Energy is the capacity of a physical system to perform work. It is an essential aspect of our daily lives and is involved in almost all human activities, from heating and cooling our homes to powering transportation and manufacturing processes.

Learn more about energy here:

https://brainly.com/question/1932868

#SPJ1

Answer:

Temperature physically changes matter

So, at STP, there are around 891 grammes of nitrogen gas in every 759 litres.

The two stable isotopes of naturally occurring nitrogen (7N) are nitrogen-14 and nitrogen-15, with nitrogen-14 constituting 99.6% of all naturally existing nitrogen. Along with one nuclear isomer, 11mN, fourteen radioisotopes with atomic masses ranging from 10 to 25 are also known.

Assuming "ST" refers to standard temperature and pressure (0°C and 1 atm), we can use the ideal gas law to calculate the mass of nitrogen gas:

PV = nRT

where n is the number of moles, P is the pressure, V is the volume, and T is the temperature, and R is the gas constant.

The temperature and pressure are 273.15 K and 1 atm, respectively, at STP.

To solve for n, the number of moles, we can rearrange the ideal gas law equation as follows:

n = PV / RT = (1 atm) * (759 L) / (0.0821 L·atm/(mol·K) * 273.15 K) = 31.8 mol

Now we can calculate the mass of nitrogen gas:

mass = n * molar mass = 31.8 mol * 28.01 g/mol ≈ 891 g.

To know more about nitrogen gas visit:-

https://brainly.com/question/13907528

#SPJ1

The pH of the HCl solution made by adding 0.878 moles HCl to water that has a total volume of a solution of 1855ml is 0.33.

To find the pH of the solution, follow these steps:

1. Calculate the concentration of HCl in the solution: Divide the moles of HCl by the volume of the solution in liters.
0.878 moles HCl / (1855 mL * 0.001 L/mL) = 0.473 M (molar concentration)

2. Since HCl is a strong acid, it will dissociate completely in water to form \(H^+\) ions and \(Cl^-\) ions:
HCl(aq) →  \(H^+\)(aq) +  \(Cl^-\)(aq)

3. The concentration of  \(Cl^-\) ions in the solution will be equal to the concentration of HCl since it dissociates completely:
[ \(Cl^-\)] = 0.473 M

4. Use the formula for pH to find the pH of the solution:
pH = - \(log_{10}\) [ \(Cl^-\)]
pH = - \(log_{10}\) (0.473)

5. Calculate the pH:
pH ≈ 0.33

Therefore, the pH of the solution is approximately 0.33.

To learn more about solution refer: https://brainly.com/question/12729588

#SPJ11

Answer:

force exerted on the ball

Explanation:

Answer:

The gram formula mass is the sum of the gram atomic masses of the atoms that make up a chemical formula. For lithium fluoride this works out to be 7g + 19g = 26g. Hence the mass of 1 mole of LiF is 26g; and the mass of 1.5 moles of LiF must be 1.5 × 26g = 39g.

Answer:

New growth of trees is an exception

Explanation:

when volcanoes erupt, they release hot magma that is destructive to the environment causing personal damage, lack of breathable air and death.

heat produce cannot in any way help in growth of trees

Only the combination of NaOH (aq) and Fe(NO3)2 (aq) will produce a precipitate, which is Fe(OH)2. The other combinations will not result in a precipitate.

To determine which combinations will produce a precipitate, we need to consider the solubility rules for common salts. Here's an analysis of each combination:

NaOH (aq) and Fe(NO3)2 (aq):

According to solubility rules, hydroxides (such as NaOH) are generally insoluble except for those of alkali metals and some alkaline earth metals. Fe(OH)2 is an exception and forms a precipitate. Therefore, this combination will produce a precipitate.

AgNO3 (aq) and Ca(C2H3O2)2 (aq):

Silver nitrate (AgNO3) is soluble, while calcium acetate (Ca(C2H3O2)2) is also soluble. Therefore, no precipitate will form in this combination.

NaCl (aq) and HC2H3O2 (aq):

Both sodium chloride (NaCl) and acetic acid (HC2H3O2) are highly soluble in water, so no precipitate will be formed.

NaOH (aq) and HCl (aq):

Sodium hydroxide (NaOH) is soluble, while hydrochloric acid (HCl) is a strong acid that dissociates completely. Therefore, no precipitate will form in this combination.

NH4OH (aq) and HCl (aq):

Ammonium hydroxide (NH4OH) is partially ionized and can act as a weak base. Hydrochloric acid (HCl) is a strong acid. The reaction between NH4OH and HCl results in the formation of water and ammonium chloride (NH4Cl). Ammonium chloride is soluble, so no precipitate will form.

In summary, only the combination of NaOH (aq) and Fe(NO3)2 (aq) will produce a precipitate, which is Fe(OH)2. The other combinations will not result in a precipitate.

learn more about precipitate here

https://brainly.com/question/30904755

#SPJ11

Answer:

A. Food

Explanation:

Water alone does not give energy, Carbon Dioxide cannot be consumed healthily, and photosynthesis is for plants.

Answer:

1.35g

Explanation:

times the density and volume together to get the mass

0.9 x 1.5 = 1.35g

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Thus the frequency of light is  6.8×10¹⁴  Hz.

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave, light wave.

There is a relation between frequency of wave, and wavelength of wave

Mathematically,

ν =c÷λ

where,

ν =frequency of light

c is speed of light that is 3×10⁸m/s

λ is the wavelength of light=4.38 ×10⁻⁷m

Substituting all the values

=3×10⁸m/s÷4.38 ×10⁻⁷m

= 6.8×10¹⁴  Hz

Thus the frequency of light is  6.8×10¹⁴  Hz.

To know more about electromagnetic wave, here:

https://brainly.com/question/12289372

#SPJ1

Answer:

A

Explanation:

I hope this is correct and have a great day

A is 14.03 in the given equation y = Ax + (Bx^2)/2, if we substitute y = 23.2, x = 1.40 and B = 3.63.

This is an algebraic equation with two variables of order 2. The values of x, y and the coefficient of x^2 is given here.

The given equation y = Ax + (Bx^2)/2 has the variables A, x, y, and B.

By substituting the variables y, x, and B, we can get A from the equation.

y = 23.2

x = 1.40

B = 3.63

Substituting these values,

23.2 = A*1.40 + (3.63*1.4^2)/2

23.2 = 1.4A + 3.63*1.96/2

23.2 = 1.4A + 7.1148/2

23.2 - 3.5574 = 1.4A

1.4A = 19.6426

A = 19.6426/1.4

A = 14.03

Therefore, A = 14.03

For more questions on substitution, check out,

https://brainly.com/question/22340165

#SPJ9

When the plunger of the syringe was pulled upward, the balloon expanded or inflated.

When the plunger of the syringe was pushed, the balloon compressed or deflated.

For Activity B, after being submerged in warm water, the balloon expanded or inflated.

The expansion of the balloon can be explained by the gas laws and the kinetic molecular theory (KMT). The gas laws state that when the temperature of a gas increases, its volume also increases, assuming that pressure remains constant. KMT explains that gas particles have kinetic energy and move randomly and rapidly, colliding with each other and the container they are in.

Learn more about syringes on

https://brainly.com/question/28221550

#SPJ1