Which of these is a chemical property?

boiling point
odor
ability to rust
color

Answer:

phosphorus i believe

Explanation:

in order to find the atomic number you minus the mass number from number of neutrons then just look it up in a periodic table

The mass number of the atom is 100 and number of neutrons is 85. Then, number of protons is 15. Then, element with 15 protons and 15 electrons is phosphorous.

An atom is composed of subatomic particles electrons, protons and neutrons. Protons and neutrons are located inside the nucleus. The mass number of an atom is sum of number of protons and neutrons.

The number of electrons in an atom in its neutral state is called its atomic number. In a neutral atom, the number of electrons and proton are the same.

Give the mass number = 100

no.of neutrons = 85

no.of protons = 100 -85 =15

no.of electron = 15

Thus, atomic number = 15.

The element with atomic number of 15 is phosphorous (P).

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Answer:

[tex]m=840.88g[/tex]

Explanation:

Hello,

In this case, considering the ideal gas equation as:

[tex]PV=nRT[/tex]

We can first compute the moles of air at the given conditions of 195 kPa (1.92 atm), 10 °C (283K) and 350 L:

[tex]n=\frac{PV}{RT}=\frac{1.92atm*350L}{0.082\frac{atm*L}{mol*K}*283K}\\ \\n=29.03molAir[/tex]

Next, since the molar mass of air is 28.97 g/mol, the mass is computed to be:

[tex]m=29.03mol*\frac{28.97g}{1mol} \\\\m=840.88g[/tex]

Best regards.

Answer:

Yes, it is standard for each element. You can calculate it from the formula: n=A-Z, where n is the number of neutrons, A is the atomic mass and Z is the atomic number.

Answer:

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

Explanation:

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

Chemical properties are properties that can be measured or observed only when matter undergoes a change to become an entirely different kind of matter.

Substances made of wood, such as paper and cardboard, are also flammable.

Chemical properties are properties that can be measured or observed only when matter undergoes a change to become an entirely different kind of matter.

They include reactivity, flammability, and the ability to rust.

Hence, option C is correct.

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Answer:

electrons

Explanation:

In an atom, you can have varying numbers of electrons, depending on if its an ion or not.  You can use the orbitals to see the energy level of the atom.

An atom has only one number of protons.  The number of protons cannot vary.

Answer:

A.

Explanation:

Quantitative analysis.

Answer:

11.3 g/cm³ = 11.3x100x100x100/ 1000 = 11300kg/m³

Explanation:

Answer:

No. of protons = 34

Explanation:

First we need to calculate the number of electrons in one mole of the the element:

No. of electrons per mole = Total Mass of Electrons/Mass of 1 Electron

No. of electrons per mole = (18.65 x 10⁻³ g)/(9.109 x 10⁻²⁸ g)

No. of electrons per mole = 2.04 x 10²⁵ electrons/mol

Now, we calculate the no. of electrons in 1 atom:

No. of electrons per atom = No. of Electrons per mole/No. of atoms per mole

No. of electrons per atom = (2.04 x 10²⁵ electrons/mol)/(6.022 x 10²³ atoms/mol)

No. of electrons per atom = 34 electrons/atom

Since, the no. of protons in a pure element are equal to the number of electrons. Therefore,

No. of protons = 34

In this exercise we have to use the knowledge of atoms to calculate the number of protons, in this way we find:

Protons will be  34

First we need to reckon the number of electrons fashionable individual blemish of the the place where one feels comfortable:

[tex]electrons \ per \ mole = Total\ Mass\ of \ Electrons/Mass\ of\ 1 \ Electron\\ electrons\ per\ mole = (18.65 * 10^{-3} g)/(9.109 * 10^{28} g)\\ electrons \ per \ mole = 2.04 x 10^{25} electrons/mol[/tex]

Now, we plan on the electrons in 1 smallest part of something:

[tex]electrons\ per\ atom = Electrons\ per\ mole/atoms\ per\ mole\\ electrons\ per\ atom = (2.04 * 10^{25} electrons/mol)/(6.022 * 10^{23} atoms/mol)\\ electrons\ per\ atom = 34 electrons/atom [/tex]

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Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

density = 10 g/ml

volume = 80 ml

The mass of the substance is

mass = 10 × 80

We have the final answer as

Hope this helps you

Answer:

The correct option is the last option

Explanation:

The chemical reaction provided in the question is a double-displacement reaction which is an exothermic reaction (which is the reason for the release of heat). An example of a double displacement reaction and exothermic reaction is the neutralization reaction illustrated below.

HCl + NaOH ⇒ NaCl + H₂O

From the law of conservation of energy, energy can neither be created nor destroyed, hence the total energy in a given system should ordinarily be the same (in the reactants and products), however when energy is released in a reaction (as in the case with an exothermic reaction), it shows there are more bond energy in the reactants than in the products and it is the excess energy that is been released into the atmosphere.

Answer:

heeeee pues hola no se chao

Answer:

B. salt

-

I know that you answered this question like a month ago, but im going to answer anyway for the people who is having a hard time answering this :D

Answer:

activity coefficient [tex]\mathbf{\gamma =0.809}[/tex]

activity coefficient [tex]\mathbf{\gamma = 0.791}[/tex]

The change in pH in part A = 0.092

The change in pH in part B =  0.102

Explanation:

From the given information:

pH of HCl solution = 1.092

Activity of the pH solution [a] = [tex]10^{-1.092}[/tex]

[a] = 0.0809 M

Recall that [a] = [tex]\gamma[/tex] × C

where;

[tex]\gamma[/tex]  = activity coefficient

C = concentration

Making the activity coefficient the subject of the formula, we have:

[tex]\gamma = \dfrac{[a]}{C}[/tex]

[tex]\gamma = \dfrac{0.0809 \ M}{0.100 \ M}[/tex]

[tex]\mathbf{\gamma =0.809}[/tex]

B.

The pH of a solution of HCl and KCl = 2.102

[a] = [tex]10^{-2.102}[/tex]

[a] = 0.00791 M

activity coefficient [tex]\gamma = \dfrac{0.00791 \ M}{0.01 \ M}[/tex]

[tex]\mathbf{\gamma = 0.791}[/tex]

C. The change in pH in part A = 1.091 - 1.0 = 0.092

The change in pH in part B = 2.102 -2.00 = 0.102

Answer:

D. all of these are chemical changes

Answer:

Using my (not very precise) periodic table, I get the mass of Ag as 107.87

Explanation:

This must be a combination of these two isotopes. So the % of the other isotope must be 48.16%.

To work with these percentages in an equation I'll use them as decimals.

So now I can start putting them into an equation:

107.87  =  ( 106.905 ⋅ 0.5184 )  +  ( x ⋅ 0.4816 )  

Because both of the isotope masses, multiplied by their percentage, would give us the overall average mass.

107.87  =  55.419552  ⋅  (  x  ⋅  0.4816 )  

Worked out the brackets that we can work out, and then rearrange to give:

107.87  −  55.419552  =  (  x  ⋅  0.4816  )

Again rearrange:

52.450448 =  (  x  ⋅  0.4816  )  

And final rearranging:

x  =  52.450448  - 0.4816

x

=

108.909

(using same sig figs as given in question)

You probably want to work through that again using your periodic table value for Ag.

Explanation:

1s2 2s2 2p6 3s2 3p4

Oxidation number refers to the number of electrons that an atom gains or loses as it forms a chemical bond with another element.

From the electronic configuration above, it is expected that sulphur has oxidation number of 2. This is because the p orbital can hold a maximum of 6 electrons. However, in the electronic configuration it is just holding 4. To complete it, it needs to gain 2 more electrons.

Answer:

+4, +6, –2

Explanation:

Answer:Features very high tensile strength and toughness. Titanium alloys are light in weight, have superior corrosion resistance properties and can withstand extreme temperatures. ... Titanium alloys are heat-treated to increase their strength in terms of fracture toughness, fatigue strength and high temperature strength.35 grams is the sollubility.

Explanation:

Answer:

F.p   ≈  - 66.16⁰c

B.p  ≈ 59.1⁰c

Explanation:

Normal boiling point = 61.2⁰c

Normal freezing point = -63.5⁰c

Kb = 3.63⁰⁰ c/m

Kf = 4.70⁰ c/m

molar mass = 253.8 g/mol

solvent = 350 g = 0.35 kg

calculate The new freezing point and Boiling point

First we have to find the molality = number of moles / solvent in kg

= 0.198 / 0.35 = 0.5657 M

Hence the new freezing point can be calculated as

Normal freezing temp -  new freezing temp = Kf * molality

= -63.5 - F.p = 4.7 * 0.5657

F.p = -63.5 - 2.6588 ≈  - 66.16⁰c

Boiling point

Normal boiling point - new boiling point = Kb * molality

= 61.2 - B.p = 3.63 * 0.5657

B.p = 61.2 - 2.0535 ≈ 59.1⁰c

Visible light, infrared, microwaves. This is the waves in order of frequency, from highest to lowest. Therefore, the correct option is option D.

One of the various ways that energy moves through space is electromagnetic radiation. Electromagnetic radiation includes the heat from a blazing fire, the sun's light, the X-rays your doctor uses, and the energy used it to cook food inside a microwave. Although though these energies may appear to be very different from each other, they are connected by the fact that they all have characteristics of waves.

The amplitude of a wave is the vertical line between both the tip of the crest and the wave's axis. This is the characteristic linked to the wave's brightness or intensity. The wavelength of a wave is the horizontal separation of two succeeding crests or troughs. Visible light, infrared, microwaves. This is the waves in order of frequency, from highest to lowest.

Therefore, the correct option is option D.

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Answer:

Carbon gets incorporated into marine organisms as organic matter or structural calcium carbonate.

Explanation:

ur welcome

Carbon gets incorporated into marine organisms as organic matter or structural calcium carbonate.

The carbon cycle describes how carbon moves between the atmosphere, soils, living creatures, the ocean, and human sources.

Carbon gets incorporated into marine organisms as organic matter or structural calcium carbonate. When organisms die, their dead cells, shells and other parts sink into deep water. Decay releases carbon dioxide into this deep water.

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There are 110 neutrons in the stable isotope of rhenium. The correct option is D.

A neutron is a subatomic particle that exists in the nucleus of all atoms except simple hydrogen. The name of the particle comes from the fact that it has no electrical charge; it is neutral. Neutrons have a very high density.

With the exception of the single-proton hydrogen nucleus, nuclei require neutrons to be stable. Neutrons are abundantly produced during nuclear fission and fusion.

Through mainly the process of fission, fusion, as well as neutron capture processes, they are a major contributor to the nucleosynthesis of chemical elements within stars.

The element rhenium-185 is made up of 75 protons, 110 neutrons, and 75 electrons. The element rhenium-187 is made up of 75 protons, 112 neutrons, and 75 electrons.

Thus, the correct option is D.

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Answer:

In order of increasing frequency and decreasing wavelength these are: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays........... ᕕ( ᐛ )ᕗ

..

Answer:

3 : 1

Explanation:

The following data were obtained from the question:

Initial temperature (T₁) = T

Initial pressure (P₁) = P

Final temperature (T₂) = 3T

Final pressure (P₂) =..?

Since the volume is constant, we shall use the following formula P₁ /T₁ = P₂ /T₂ to obtain the final pressure. This is illustrated below:

P₁ /T₁ = P₂ /T₂

P/T = P₂ /3T

Cross multiply

T × P₂ = P × 3T

Divide both side by T

P₂ = P × 3T /T

P₂ = P × 3

P₂ = 3P

Therefore, the final pressure is tripled.

Finally, we shall determine the ratio of the final pressure to the initial pressure as follow:

Initial pressure (P₁) = P

Final pressure (P₂) = 3P

Final pressure (P₂) : Initial pressure (P₁)

P₂ : P₁ => 3P/P

P₂ : P₁ => 3 : 1

Therefore, the ratio of the final pressure to the initial pressure is 3 : 1

Answer:

Most metalloids have some physical properties of metals and some physical properties of nonmetals. They fall between metals and nonmetals in their ability to conduct heat and electricity. They are shiny like metals but brittle like nonmetals.

Explanation:

celcius and Fahrenheit are the same at -40 degrees since the scales converge . celcius and Kelvin become Equal at high temperatures as the difference. of 273. 15 between them gets lost in the noise . 0 degree Celsius is Equal to 32degrees Fahrenheit.

Answer:

pb am 207.19 amu

pb206, pb207and pb208

Answer:

16

Explanation:

Explanation:

The pH is larger than 7.

The relationship between pH and pOH is

pH + pOH = 14

if something is base, it's pH is greater than 7.

it's pOH is between 0 and 7.