an atom has 79 protons, 78 electrons and a mass number of 118. how many neutrons does this atom have​

Density of the given sample is 12.66 grams per milliliter.

Mass per unit volume is the definition of a material's density. The degree to which matter is packed together is fundamentally measured by density. It is a particular physical characteristic of a specific thing.

Density = mass/volume

Given mass = 50g

Given Volume = 3.95mL

According to question, we are required to find the density in units : grams per milliliter

Since the given values for mass and volume are grams and milliliters respectively, no change in units is required.

Putting the given values in the formula, Density = mass/volume

Density = 50/3.95

Density = 12.658 grams per milliliter

We can say, Density = 12.66 grams per milliliter

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Answer:

25.6 moles of K.

Explanation:

In the chemical equation you can see that 2 moles of potassium (K) react with 1 mol of magnesium bromide (MgBr2), so based on this information let's find the number of moles of K that we required by 12.8 moles of MgBr2:

The answer would be that we require 25.6 moles of K.

You would recover 36.525g of NaCl after evaporating all of the water.

To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:

mass = moles * molar mass

Where:

Moles = Molarity * Volume

Molarity = 0.250 M

Volume = 2500.0 mL = 2.5 L

Molar mass of NaCl = 58.44 g/mol

mass = 0.250 M * 2.5 L * 58.44 g/mol

mass = 36.525 g

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Answer:

Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other

Answer:

Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.

Explanation:

The element that has chemical properties most similar to sodium is d. rubidium.

What is rubidium?

Rubidium is in the same group (group 1) as sodium in the periodic table and has similar chemical properties, such as reactivity with water and the tendency to form ionic compounds with halogens. Magnesium, oxygen, and phosphorus are not in the same group as sodium and have different chemical properties.

What is periodic table?

The periodic table is a tabular display of all known chemical elements, arranged according to their atomic structure and properties. It is arranged in rows and columns, with elements placed in order of increasing atomic number, which is the number of protons in an atom's nucleus. The periodic table is a powerful tool for predicting the chemical behavior of elements and for understanding the relationships between different elements. It is used extensively in chemistry, physics, and other sciences to help understand the properties and behavior of different elements, and to guide research and development in many different fields.

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Given :

For a chemical reaction, the activation energy for the forward reaction is +181 kJ and the activation energy for the backward reaction is +62 kJ.

To Find :

The overall energy change for the forward reaction.

Solution :

The overall energy change for the forward reaction is :

\(\Delta E_f = E_f - E_b\\\\\Delta E_f = 181 - 62 \ Kj\\\\\Delta E_f = 119 \ Kj\)

Therefore, the overall energy change for the forward reaction is 119 Kj.

Explanation:

What is biology definition

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Answer:The colour and distribution of the organism's biochromes

Explanation:

The colour and distribution of the organism's biochromes (pigments), particularly the relative location of differently coloured areas; the shape, posture, position, and movement of the organism; and the quality and quantity of light striking the organism

Answer:

49.0g/mol is molar mass of X

Explanation:

551mg of X are dissolved in 100g of benzonitrile

Freezing point of solution: -13.4°C

The freezing point depression of a solution (Colligative property) follows the equation:

ΔT = Kf*m*i

Where ΔT is change in freezing point from the pure solvent (Benzonitrile: -12.8°C) to the solution (-13.4°C)

Kf is freezing point depression of benzonitrile: 5.34°C/m

m is molality of the solution (Moles X / kg of benzonitrile)

And i is Van't Hoff factor (1 for any solute in benzonitrile)

ΔT = -12.8°C - (-13.4°C) = 0.6°C

Solving for molality of the solution:

ΔT = Kf*m*i

0.6°C = 5.34°C/m*m*1

0.1124m = molality of the solution

Moles of X are:

0.1124mol/kg benzonitrile * 0.1kg benzonitrile = 0.01124 moles X

In 551mg = 0.551g:

Molar mass:

0.551g / 0.01124mol =

49.0g/mol is molar mass of X

Explanation:

none because they can not be mixed together

Answer:

Explanation:

1mol of \(O_2=2*16{gr\over{mol}}=32{gr\over{mol}}\\\\15.7gr->15.7gr*{1\over{32{gr\over{mol}}}}=0.491mol~of~O_2\)

as 1mol of molecular oxigen reacts with 4 mol of aluminium

1 mol of O2         -----------------------------> 4 mol of Al

0.491 mol of O2  ------------------------------>     x

\(x={0.491*4\over{1}}~mol~of~Al=1.9625~mol~of~Al\)

The concentration of CO2 in club soda is approximately 1.1964 g/L.

To find the concentration of CO2 in club soda, we need to use the stoichiometry of the reaction and the volume and concentration of the NaOH solution used.

The balanced equation for the reaction is:

CO2(aq) + 2NaOH(aq) → Na2CO3(aq)

From the stoichiometry of the equation, we can see that 1 mole of CO2 reacts with 2 moles of NaOH. Therefore, the moles of CO2 can be calculated using the volume and concentration of NaOH solution used.

Given that 32.14 mL of 0.04202 M NaOH solution was used, we can calculate the moles of NaOH:

moles of NaOH = volume (L) × concentration (M)

moles of NaOH = 32.14 mL × 0.04202 mol/L

moles of NaOH = 0.001351 mol

According to the stoichiometry of the equation, 1 mole of CO2 reacts with 2 moles of NaOH. Therefore, the moles of CO2 can be calculated as:

moles of CO2 = (moles of NaOH) / 2

moles of CO2 = 0.001351 mol / 2

moles of CO2 = 0.0006755 mol

Now, we need to convert the moles of CO2 to grams. The molar mass of CO2 is approximately 44.01 g/mol.

mass of CO2 = moles of CO2 × molar mass of CO2

mass of CO2 = 0.0006755 mol × 44.01 g/mol

mass of CO2 = 0.02979 g

Finally, we need to express the concentration of CO2 in club soda in g/L. We are given that the sample of club soda used is 25.00 mL.

concentration of CO2 = (mass of CO2) / (volume of club soda in L)

concentration of CO2 = 0.02979 g / (25.00 mL × 0.001 L/mL)

concentration of CO2 = 1.1964 g/L

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Explanation:

speed of light is 3×10^8 m/ s

1/137 of 3 × 10^ 8 m/s ( u get the speed the electron was moving with)

mass of electron 9.109× 10^-31 kg( i think we consider the mass of electron if the relativistic correction of the mass is negligible)

then from de Broglie wavelength= h/ mv

h is planck constant 6.626 × 10^-34

substitute the valies and you get the answer

am sorry I don't have my calculator with me I wuld hv written the answer bt I hope this helps

The de Broglie wavelength of an electron moving at 1/137th the speed of light is 0.24 × 10¹¹m.

The term de Broglie wavelength defined as the wavelength (λ) that is associated with an object in relation to its momentum and mass.

De Broglie wavelength is mostly represented by the symbol λ or λdB. For a particle with momentum p, the de Broglie wavelength is known as λdB = hp. where h is the Planck constant.

The speed of light = 3×10^8 m/ s

1 / 137 × 3 × 10^ 8 m/s

The mass of electron 9.109× 10^-31 kg

then from de Broglie wavelength

= h / mv

Where,

h is Planck constant 6.626 × 10^-34

substitute the values in above equation

We get,

=  6.626 × 10⁻³⁴ / 9.109 × 10⁻³¹ × 3×10⁸

= 0.24 × 10¹¹m

Thus, The de Broglie wavelength of an electron moving at 1/137th the speed of light is 0.24 × 10¹¹m.

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The element that can bond with titanium (Ti) in order to form a polar covalent bond is nitrogen (abbreviated as N).

A covalent bond is a type of chemical bond in which two different atoms interact due to differential electronegative charges. A polar covalent bond is formed in the case that differential electronegativity between atoms that may share negatively charged electrons through a covalent bond.

In consequence, a polar covalent bond is a special class of covalent bond where atoms show an unequal distribution in the covalent bond.

Therefore, with this data, we can see that polar covalent bonds represent a special class of covalent bonds where the atoms form a bond but they are distributed in an equal way, which occurs between titanium and nitrogen due to their electronegative charges and therefore unequal distribution of these charges.

Complete question:

Which element can bond with titanium (Ti) to form a polar covalent bond?A.

beryllium (Be)

B.

fluorine (F).

C.

manganese (Mn)

D.

nitrogen (N)

E.

oxygen (0)

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The correct answer is: Atoms are the building blocks that make up elements. At the center of each atom is a nucleus composed of small particles called protons and neutrons. Nuclei is the plural of nucleus; option C.

The atomic number of an element is the number of protons present in the nucleus of the atom of the element.

The nucleus is the center of the atom and is the heaviest part of the atom.

Another sub-atomic particle fund in the nucleus is the neutron.

Elements are named according to the number of protons in the nuclei.. This is because the number of protons in the nucleus of any given atom whereas the neutron number may vary, Also, electrons are easily removed from atoms of elements.

In conclusion, the number of protos in atom is used to name the atom.

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Answer: Seafloor spreading causes changes in coastlines

The society with the least negative effects on the environment is probably the one with a small population, traditional farming methods, no access to contemporary technology, and self-sufficient food production.

This is due to the fact that their way of living is less dependent on modern infrastructure and technology, both of which have a negative impact on the environment. Additionally, their agricultural methods are probably more environmentally friendly and sustainable.

The environmental effects of the other societies on the list would all be greater. Because of the use of fossil fuels and the production of products that require a lot of resources, a big, industrialized society with high levels of consumption would have a significant carbon footprint.

It would still take a lot of resources to maintain its infrastructure and create products in a less populous, highly industrialized society with moderate consumption levels, which would have a negative effect on the environment.

Given that the size of the population alone would necessitate significant resource consumption and infrastructure development, a big population with moderate industrialization and consumption levels would also have a big effect on the environment.

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Answer:

the pressure at the top of the mountain was 0.85 atm.

Explanation:

We can use the combined gas law to solve this problem:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

where P1, V1, and T1 are the initial pressure, volume, and temperature, and P2, V2, and T2 are the final pressure, volume, and temperature.

Assuming that the temperature remains constant, we can simplify the combined gas law to:

P1 * V1 = P2 * V2

where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

Substituting the given values, we get:

P1 * 1.0 L = 1 atm * 0.85 L

P1 = (1 atm * 0.85 L) / 1.0 L

P1 = 0.85 atm

Answer:

The correct answer to the following question will be "0.0013%".

Explanation:

The given values are:

Weight of an empty dish = 1.0041 ± 0.0002 g

Weight of dish + sodium chloride (NaCl) = 3.2933 ± 0.0002 g

Weight of NaCl = 2.2892 ± 0.0002 g

Now,

Volume of the solution = 500.00 ± 0.05 ± 0.0002

                                      = 500.00 ± 0.0502 ml

So,

Molarity = \(\frac{W \ NaCl}{M \ NaCl} \times \frac{1000}{Volumes \ of \ solution}\)

On putting the values in the above formula, we get

             = \(\frac{(2.2892\addeq +0.0002)}{58.440}\times \frac{1050}{(500.00+0.0502)}\)

             = (\(3.917\) ± \(0.0002\)) × (\(2\) ± \(0.0502\))

             = (\(0.7834\) ± \(.00001004\))

Now,

Absolute error = \(\frac{0.00001004}{0.7834}\times 100\)

                         = \(0.0013\)%

Explanation:

C3H8+5O2----->3CO2+4H2O

Answer:

C3H8+5O2----->3CO2+4H2O

Explanation:

Answer:

performing

Explanation:

Answer:

dew is wet and clouds are not

Explanation:

The following compounds are listed in decreasing order of intermolecular force strength:

CH₃CH₂CH₂CH₂CH₂CH₃ > (CH₃)₃CCH₂CH₃ > (CH₃)₃CCH₃

1) The following compounds are listed in decreasing order of intermolecular force strength: as branching grows, intermolecular force falls, or as surface area reduces, intermolecular force increases.

CH₃CH₂CH₂CH₂CH₂CH₃ > (CH₃)₃CCH₂CH₃ > (CH₃)₃CCH₃

2) The lowest boiling point and weakest van der wall forces are seen in the combination CH3CH2CH3.

3) The compounds listed below, in ascending sequence of increasing vapour pressure at a specific temperature, are as follows:

SF₄ < SF₆ < SiH₄  

The most polar molecule and one with the lowest vapour pressure is SF4.

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The mass percentage of KClO₃ in the initial mixture, given that the initial mixture has a mass of 7.25 g, is 62.2%

First, we shall determine the molar mass of KClO₃ and KCl. Details below:

For KClO₃

Molar mass of KClO₃ = 39 + 35.5 + (3 × 16)

Molar mass of KClO₃ = 39 + 35.5 + 48

Molar mass of KClO₃ = 122.5 g/mol

For KCl

Molar mass of KCl = 39 + 35.5

Molar mass of KCl = 74.5 g/mol

Next, we shall determine the mass of KClO₃ in the initial mixture. Details below:

Mass of KClO₃ = [molar mass of KClO₃ / molar mass of (KClO₃ + KCl)] × mass of mixture

Mass of KClO₃ = [122.5 / (122.5 + 74.5)] × 7.25

Mass of KClO₃ = 4.51 g

Finally, we shall determine the mass percentage of KClO₃. Details below:

Mass percentage of KClO₃ = (mass of of KClO₃ / mass of mixture) × 100

Mass percentage of KClO₃ = (4.51 / 7.25) × 100

Mass percentage of KClO₃ = 62.2%

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Flammable solids are materials that are assigned to hazard classes based on their chemical structure.

The classification of chemical compound based on their hazardous nature include the following:

Most oftentimes symbol are being used for a better understanding and fast passage of information to passerby t.

Therefore, flammable solids are materials that are assigned to hazard classes based on their chemical structure.

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Answer:

What are the compounds

Explanation:

Answer:

Where is the picture?

Explanation:

Answer:

Lake pontchartrain

Explanation:

The rock sample on the left is basalt, a type of igneous rock. Heat and intense pressure changed the basalt into blueschist, a type of metamorphic rock glaucophane schist

Blueschist facies is determined by the particular temprature and pressure condition required to metamorphose basalt to form blueschist and felsic rock and pelitic sediment which are subjected to blueschist facies condition will form different mineral assemblages then metamorphosed and blueschist facies rock are generally formed in subduction zones where oceanic crust is being stuffed into a trench that will become true blueschist once they were pressure cooked and also called glaucophane schist and is a metavolcanic rock that with similar composition at high pressure and low temprature

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Answer:

all of them

Explanation:

i just did it

Lewis structure shows the electrons in a specie as dots.

A Lewis structure is a structure that shows the valence electrons in an atom  or a molecule as dots. Sometimes, a single dash can be used to indicate shared electrons in molecules.

The following are aspects of the Lewis structure of ammonia;

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