A compound has an M-/M-2 ratio of 75:25. Which of the following could be the molecular formula of this compound? a) CH2Br2 b) CH2Cl2 c) CHCI d) CH:Bre) CHF

Answer:

i think its natural . it is the natural process

Answer:

Solar radiation falls into the category of natural forces.

Explanation:

Natural forces don’t have a strong effect on recent global temperatures. The natural forces line begins to drop around 1950 and does not track with the observed temperature line. On the other hand, the human effects line rises upward with the observed temperatures, so it’s a stronger effect.

Brainilest?

Answer:

Short wavelength UV radiation ----Oxygen (O2 ), nitrogen (N2) , methane (CH4) , water (H2O)  and carbondioxide (CO2).

longer wavelength radiation---- methane (CH4) , water (H2O)  and carbondioxide (CO2)

Explanation:

Oxygen (O2 ), nitrogen (N2) , methane (CH4) , water (H2O)  and carbondioxide (CO2) are the gases which are transparent for incoming short-wavelength UV radiation while  methane (CH4) , water (H2O)  and carbondioxide (CO2) are the greenhouse gases which absorb longer wavelength. When the solar radiation comes to the earth, it has short wavelength but after reflection it converts into longer wavelength which can be prevent by greenhouse gases and increases the temperature of atmosphere.

CH4, H2O and CO2 gases absorb longer wavelength terrestrial re-radiation.

UV radiation are short wavelength radiation that reach the earth from outer space. However, certain gases that compose the atmosphere are able to absorb longer wavelength terrestrial re-radiation.

The following gases absorb longer wavelength terrestrial re-radiation;

The following gases are transparent to  incoming short-wavelength UV radiation;

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Answer:

ρ = 1.08 g/cm³

Explanation:

Step 1: Given data

Mass of the substance (m): 21.112 g

Volume of the substance (V): 19.5 cm³

Step 2: Calculate the density of the substance

The density (ρ) of a substance is equal to its mass divided by its volume.

ρ = m / V

ρ = 21.112 g / 19.5 cm³

ρ = 1.08 g/cm³

The density of the substance is 1.08 g/cm³.

Answer:

Yes, given statement is true.

Explanation:

Given that a cylinder of 1000 ml is marked at every 100 ml.

During the test, the student can easily check the volume of liquid so the student's guess is 750 ml true.  

With this measurement, we can estimate that 1/10th of 100 ml can be measured.  

So, given statement is correct.

Answer:

Yes, the digit in the hundreds place is certain and the digit in the tens place is estimated.

Explanation:

Answer:

pH of the final solution = 9.15

Explanation:

Equation of the reaction: HCl + NH₃ ----> NH₄Cl

Number of moles of  NH₃ = molarity * volume (L)

= 0.4 M * (300/1000) * 1 L =  0.12 moles

Number of moles of HCl =  molarity * volume (L)

= 0.3 M * (175/1000) * 1 L = 0.0525 moles

Since all he acid is used up in the reaction, number of moles of acid used up equals number of moles of NH₄Cl produced

Number moles of NH₄Cl produced =  0.0525 moles

Number of moles of base left unreacted =  0.12 - 0.0525 = 0.0675

pOH = pKb + log([salt]/[base])

pKb = -logKb

pOH = -log (1.8 * 10⁻⁵) + log (0.0525/0.06755)

pOh = 4.744 + 0.109

pOH = 4.853

pH = 14 - pOH

pH = 14 - 4.853

pH = 9.15

Therefore, pH of the final solution = 9.15

Answer:

pure substances and mixtures

Explanation:

pure substances are further broken down into elements and compound....... A mixture is composed of different types of atoms or molecules that are not chemically bonded.

Heterogeneous and homogeneous mixtures are the two types of mixtures. While homogeneous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components. A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.

Mixtures are materials made up of two or more different types of matter. Physical means can be used to separate them. Examples include a salt-water solution, a sugar-water solution, various gases, air, etc. The many components of any mixture do not come together by any sort of chemical transformation.

Solutions, suspensions, and colloids are the three categories into which mixtures can be divided based on particle size. A mixture's constituent parts maintain their unique physical characteristics

Answer:

both pure materials and mixes

Explanation:

The breakdown of pure substances into their component components and compounds continues. Different kinds of unchemically linked atoms or molecules make up a mixture.

To learn more about types of mixtures refer to:

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Answer:

FLUORINE, CHLORINE, BROMINE, IODINE, ASTATILE AND TENNESINE

Explanation :

Florine and chorine=gas

Bromine=liquid

ASTATILE and TENNESINE =solid

HOPE IT is right

Answer:

nanograms

Explanation:

Nuclear binding energy refers to the energy needed in order to break up the nucleus of an atom into its component parts: protons and neutrons, it is also the energy used up in the formation of the atom.

The difference between the calculated and actual mass of a nucleus gives its mass defect which is used to calculate the binding energy according to Einstein's equation. The mass differences are usually very small, as little as the order of nanograms.

Answer:

0.16 moles of Carbon

Explanation:

The balanced reaction equation:

[tex]2Fe_{2}O_{3}[/tex] + [tex]3C[/tex] → [tex]4Fe[/tex] + [tex]3CO_{2}[/tex]↑

The mole ratio of Carbon to Iron is 3 : 4 (since Fe2O3 is in excess)

i.e 3 moles of C produces 4 moles of Fe.

If 1 mole of Fe - 55.8g of Fe

? moles - 11.6g of Fe

= [tex]\frac{11.6}{55.8}[/tex] = 0.208 moles

But 3 moles of C - 4 moles of Fe

? moles of C - 0.208 moles of Fe

= [tex]\frac{3 *0.208}{4}[/tex] = 0.16 moles of carbon.

I hope this explanation was clear and useful.

Answer:

1.9 × 10⁻²⁶

Explanation:

Step 1: Write the solution reaction for M₂X₃

M₂X₃(s) ⇄ 2 M³⁺(aq) + 3 X²⁻(aq)

Step 2: Make an ICE chart

We can relate the molar solubility (S) with the solubility product constant (Ksp) using an ICE chart.

        M₂X₃(s) ⇄ 2 M³⁺(aq) + 3 X²⁻(aq)

I                              0               0

C                          +2S             +3S

E                            2S               3S

The solubility product constant is:

Ksp = [M³⁺]² × [X²⁻]³ = (2S)² × (3S)³ = 108 S⁵ = 108 (2.8 × 10⁻⁶)⁵ = 1.9 × 10⁻²⁶

The value of Ksp when there is the slightly soluble ionic compound so it should be 1.9 × 10⁻²⁶.

Since the solution reaction for M₂X₃ should be

M₂X₃(s) ⇄ 2 M³⁺(aq) + 3 X²⁻(aq)

Now make an ICE chart

So it can be like

       M₂X₃(s) ⇄ 2 M³⁺(aq) + 3 X²⁻(aq)

I                              0               0

C                          +2S             +3S

E                            2S               3S

Now The solubility product constant is:

Ksp = [M³⁺]² × [X²⁻]³

= (2S)² × (3S)³ = 108 S⁵

= 108 (2.8 × 10⁻⁶)⁵

= 1.9 × 10⁻²⁶

hence, The value of Ksp when there is the slightly soluble ionic compound so it should be 1.9 × 10⁻²⁶.

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Answer:

[tex]h=1.60\mu m[/tex]

Explanation:

Hello,

In this case, given the density and the mass of the aluminum foil, we can compute the occupied volume as shown below:

[tex]\rho =\frac{m}{V}\\ \\V=\frac{m}{\rho}=\frac{2.07g}{2.7g/cm^3} =0.767cm^3[/tex]

Next, since the volume is defined as:

[tex]V=24cm*20cm*h[/tex]

Whereas [tex]h[/tex] accounts for its thickness, we can find it to be:

[tex]h=\frac{V}{24cm*20cm}=\frac{0.767cm^3}{20cm*24cm}\\ \\h=1.60x10^{-3}cm*\frac{10000\mu m}{1cm} \\\\h=1.60\mu m[/tex]

Regards.

Answer: [tex]OH^-(aq)+NH_4^+(aq)\rightarrow NH_3(g)+H_2O(l)[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

[tex]KOH(aq)+NH_4NO_3(aq)\rightarrow KNO_3(aq)+NH_3(g)+H_2O(l)[/tex]

The equation can be written in terms of ions as:

[tex]K^+(aq)+OH^-(aq)+NH_4^+(aq)+NO_3^-(aq)\rightarrow K^+(aq)+NO_3^-(aq)+NH_3(g)+H_2O(l)[/tex]

Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.

The ions which are present on both the sides of the equation are potassium and nitrate ions and hence are not involved in net ionic equation.

Hence, the net ionic equation is :

[tex]OH^-(aq)+NH_4^+(aq)\rightarrow NH_3(g)+H_2O(l)[/tex]

Answer:

D) 5

Explanation:

In this case, the "monobromination" is the addition of one "Br" to the molecule. With this in mind, we have to explore each option to put this "Br" atom:

1) (bromomethyl)cyclopentane = The Br atom is placed in carbon 6

2) 1-bromo-1-methylcyclopentane = The Br atom is placed in carbon 1

3) (1R,2R)-1-bromo-2-methylcyclopentane = The Br atom is placed in carbon 2 (with trans configuration)

4) (1R,2S)-1-bromo-2-methylcyclopentane = The Br atom is placed in carbon 2 (with cis configuration)

5) 1-bromo-3-methylcyclopentane = The Br atom is placed in carbon 3

See figure 1

I hope it helps!

Answer:

b. In equilibrium with the liquid phase, the pressure exerted by a gas.

Explanation:

When a liquid is warmed up to a temperature , it starts vaporising . The liquid is turning into gas and gas is turning into liquid at different rates  . Initially the rate of former is higher but gradually the difference of rate between them decreases to zero . At this point the rate of conversion of liquid into gas and rate of conversion of gas into liquid becomes equal  . This is called dynamic equilibrium point .

If we change the temperature , the equilibrium gets disturbed .

At this point the pressure exerted by the gas is called the vapour pressure of the liquid .

So option b ) is correct .

At the equilibrium point, the pressure exerted by the gas molecules to the liquid molecules has been termed the Vapor pressure. Thus, statement b is correct.

The vaporization has been the process of conversion of liquid to the gaseous state with the rise in temperature. The liquids attaining a certain temperature have been vaporized into the gaseous state.

Initially, the gas phase has been less in concentration, thus the rate of formation of gas has been greater.

After a certain amount of time, the gas phase starts to cool down and converts to the liquid state. The rate of formation of the liquid has been slower.

The time when the rate of formation of liquid, and the rate of formation of gas has been equal is termed as the equilibrium point. At the equilibrium point, the pressure exerted by the gas molecules to the liquid molecules has been termed the Vapor pressure.

Thus, statement b is correct.

For more information about the Vapor pressure, refer to the link:

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Answer:

Heterogeneous Mixture. Have a good day! =)

Explanation:

The question is incomplete, so the complete question is as follows:

Decide which element probably has a melting point most and least similar to the melting point of cesium. Comparing melting point: helium thallium sodium strontium

Answer:

Most similar melting point : Sodium

Least similar melting point: Strontium

Explanation:

Melting point is defined as the temperature at which soid will melt or get converted into liquid.

Melting point of cesium is 28.44 °C and most similar melting point  is sodium as its melting point is 97.72°C and least similar melting point is strontium as it has melting point 777°C.

Hence, the correct answer is:

Most similar melting point : Sodium

Least similar melting point: Strontium

Answer:

Alloys

I hope this helps!

Answer:

D.An alloy

Explanation:

Answer:

2.15

Explanation:

For this question, we have to remember the pH formula:

[tex]pH~=~-Log[H_3O^+][/tex]

By definition, the pH value is calculated when we do the -Log of the concentration of the hydronium ions ([tex]H_3O^+[/tex]). So, the next step is the calculation of the concentration of the hydronium ions. For this, we have to use the molarity formula:

[tex]M=\frac{mol}{L}[/tex]

We already know the number of moles (0.0231 moles) and the volume (3.33 L). So, we can plug the values into the molarity formula:

[tex]M=\frac{0.0231~moles}{3.33~L}=0.00693~M[/tex]

With this value, now we can calculate the pH value:

[tex]pH~=~-Log[0.00693~M]~=~2.15[/tex]

The pH would be 2.15

I hope it helps!

Answer:

N2O(g) + 3 H2O(l) ---------------> 2 NH3(g) + 2 O2(g)

Explanation:

If we look at the reaction stated in the question, we will notice that the option chosen in the answer is the reverse of that reaction.

One thing is clear, if a reaction is possible, then its reverse reaction is equally possible. The equilibrium position may shift towards the forward or reverse reaction based on the conditions of the reaction.

Hence if the reaction, 2NH3(g) + 2O2(g) → N2O(g) + 3H2O(l) is possible, then the reaction, N2O(g) + 3 H2O(l) ---------------> 2 NH3(g) + 2 O2(g) is also possible.

Answer:

The change in temperature is [tex]26.06^{\circ} C[/tex].

Explanation:

It is given that,

The specific heat of Aluminium is cal/g°C

Mass of the sample, m = 4.55 g

Heat absorbed, Q = 2.55 cal

We need to find the change in temperature of the sample. The heat absorbed by an object is given by :

[tex]Q=mc\Delta T[/tex]

[tex]\Delta T[/tex] is the change in temperature

So,

[tex]\Delta T=\dfrac{Q}{mc}\\\\\Delta T=\dfrac{2.55\ cal}{4.55\ g\times 0.0215 \ cal/g^{\circ} C}\\\\\Delta T=26.06^{\circ} C[/tex]

So, the change in temperature is [tex]26.06^{\circ} C[/tex].

Answer: Approximately 69.5 grams of gold (Au).

Explanation:

mol = mass / molar mass

We are already given the moles of gold, 0.353. Looking at a periodic table, we cna bserve that the approximate molar mass of gold is 196.97 (I got this from ptable.com).

Plugging this into the formula above, it will look like this:

0.353 mol Au = mass / (196.97 g/mol)       (in any science class, do not forget about writing your units)

To get mass by itself, multiply both sides of the equation by 196.97 g/mol.

This yields that the mass is equal to 69.5 grams. As you can see, the units of "mol" cancel out: 0.353 mol AU * (196.97 g/mol)

The reason why I rounded my answer to 69.5 grams instead of, let's say, 69.5304, is because of a concept in science referred to as significant figures. In this case, the amount of significant figures we need to round our answer to is seen in the provided value in the problem. 0.353 has only three significant figures so I have rounded the final answer to three significant figures.

Remember, do not forget to not only unclude e units that answer should be in but some teachers also request that you write the symbol of the elemnt you are writing about, so I would write my answer as: 69.5 g Au.

I hope this helps :) have a nice day!

Answer:

Explanation:

The objective here is to draw the Lewis structure for the polyatomic trisulfide anion and to be sure all resonance structures that satisfy the octet rule are included.

The Lewis structure for  Polyatomic trisulfide anion

The first step is to the layout the skeleton of the Polyatomic trisulfide anion

         S           S           S

However, the next step is to make sure we fill in the bonding pairs of electrons on the central atom.

Then , we move over to filling the lone pairs electrons before we finally have the Lewis structure for  Polyatomic trisulfide anion as shown in the image below.

Answer:

the answer is C.

Explanation:

this is because burning anything is going to change the make-up of the object

Answer:

C). The previously known outcome of an observation or experiment can be used as solid proof that a newly-created scientific hypothesis is absolutely true.

Explanation:

A Scientific hypothesis is characterized as the proposed explanation or an educated guess about a natural phenomenon on the basis of previous knowledge as well as observation. All the given statements are true regarding a scientific hypothesis that it is 'an educated guess which explains the reason why a specific phenomenon occurs', 'being testable in a manner that could be replicated by other', 'an explanation for a natural phenomenon' except for that  the 'truth of a scientific hypothesis can never be assured completely with a solid proof as it always has chances of being expanded.' Thus, option C is the correct answer.

Answer:

Because the model makes the concepts easier to understand

Explanation:

Models are created to give a visual of every aspect of an experiment. This allows for a better understanding across the board for everyone.

Answer:

Positron emission

Explanation:

Positron emission involves the conversion of a proton to a neutron. This process increases the mass number of the daughter nucleus by 1 while its atomic number remains the same. The new neutron increases the number of neutrons present in the daughter nucleus hence the process increases the N/P ratio.

A positron is usually ejected in the process together with an anti-neutrino to balance the spins.

Answer:

0.250 moles of MgO are produced when 0.250 mol of Mg reacts completely with O₂

Explanation:

In first place, the balanced reaction between Mg and O₂ is:

2 Mg + O₂ ⇒ 2 MgO

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactants and products participate in the reaction:

Then you can apply the following rule of three: if by reaction stoichiometry 2 moles of Mg produce 2 moles of MgO, 0.250 moles of Mg, how many moles of MgO will they form?

[tex]moles of MgO=\frac{0.250 moles of Mg*2 moles of MgO}{2 moles of Mg}[/tex]

moles of MgO= 0.250

0.250 moles of MgO are produced when 0.250 mol of Mg reacts completely with O₂

Your question has been heard loud and clear.

Specific applications of mass spectrometry include drug testing and discovery, food contamination detection, pesticide residue analysis, isotope ratio determination, protein identification, and carbon dating.

Thank you

The primary function of mass spectrometry is as a tool for chemical analyses based on detection and quantification of ions according to their mass-to-charge ratio. However, mass spectrometry also shows promise for material synthesis.

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