help me with the question below

Answer:

Boron trifluoride |

Explanation:

Boron trifluoride is a colorless gas

State of matter of both substance will be liquid at 115C.

A substance-A substance's melting point is 100 degrees Celsius. Thus, liquid material A will arise from temperatures over 100 degrees. Since material A is liquid at 115 degrees Celsius, the particles are free to migrate and glide over one another.

B Substance-It has a  freezing point of 110 degrees Celsius. This signifies that substance B will exist in a liquid condition at any temperature greater than 110 °C. In a liquid condition, the components of solution B will also be sufficiently mobile to travel past one another.

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Answer:

A metal + polyatomic anion.

Explanation:

The correct balanced chemical equation is

[tex]\rm FeCl_2(aq) + 3NaOH(aq) \rightarrow Fe(OH)_3(s) + 3NaCl(s)[/tex]. Hence option A is correct.

Chemical equation is defined as the use of symbols and chemical formulas to represent a chemical reaction symbolically. Chemical equations give information about a compound's chemical make-up. The ratios in which the component parts combine to form the compound are also represented by them.

Balanced chemical equation is defined as entails giving the reactants and products stoichiometric coefficients. In a chemical equation, the number of atoms in the reactants and the number of atoms in the products must balance out.

Thus, the correct balanced chemical equation is

[tex]\rm FeCl_2(aq) + 3NaOH(aq) \rightarrow Fe(OH)_3(s) + 3NaCl(s)[/tex]. Hence option A is correct.

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Energy, in kJ, is required to completely melt 20.0 g of ice initially at -45.0 °C is 4.147kJ

Energy is the capacity for doing work

Here given data is

Mass = 20.0 g

Temprature = -45.0°C

Molar heat of fusion of ice = 6.02 kj/mol

We have to calculate energy in kJ = ?

Then q = n×ΔH

q = heat

n = number of moles

ΔH = enthalpy

First we calculate the m=number of moles

Number  of moles = mass / molar mass

Number  of moles =  12.4 g/ 18 g/mol

Number  of moles =  0.69 mol

Now put this value in formula

q = n × ΔH

q =  0.69 mol×6.02 kj/mol

q = 4.147kJ

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If there are any actual values of x for which f(x) = zero then the curve isn't always absolutely above or beneath the axis.

Check the values of y. All values positive -> curve is above y-axis. All values negative -> curve is beneath y-axis. There also are different cases. The curve might (for example) intersect the x-axis.

Adding to the output of a feature actions the graph up. Subtracting from the output of a feature actions the graph down. Here are the graphs of y = f (x), y = f (x) + 2, and y = f (x) - 2.

If the slope of f(x) is negative, then the graph of f'(x) might be beneath the x-axis. If the slope of f(x) is positive, then the graph of f'(x) might be above the x-axis. All relative extrema of f(x) turns into x-intercepts of f'(x).

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When a Kr-89 captures an electron, the particle that is formed is bromine with atomic number of 35.

Radioactivity is the spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.

The radiation emitted includes the following;

An electron is a negatively charged subatomic particle that can be either bound to an atom or free (not bound). It has a charge of -1.

According to this question, when a Kr-89 captures an electron, the particle formed can be deduced as follows:

89/36Kr + 0/-1e = 89/35Br

This suggests that the particle formed when a particle of krypton captures an electron is bromine.

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The atomic number(Z) is equal to the number of protons to equal to number of electrons.

The number of neutrons is equal to atomic mass minus the atomic number

n=A-Z

For Zn^2+, Z=28, e=28

For iron, Z=25,A=55

The number of neutrons is 55-25=30

The charge is zero

For O^2-, Z=8+2=10, n=p=10

The number of neutrons is 16-10=6

For sulfur, Z=16,A=34

For S2-, Z=16+2=18, A=34

The charge is 2-

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Ammonia is added to the test solution in a penny-earned lab to test the behavior of the reaction on a penny.

The cause of this Penny Lab is to determine how soap on a penny affects the figure of drops that it can hold, compared with a penny with no soap. Water molecules are impelled to each other, so they tend to try to stick together (cohesion). When a copper penny is heated in a solution of sodium hydroxide solution assorted with zinc dust, small amounts of zinc dissolve into the surface of the penny. This causes the penny to look silver already there is now a layer of zinc over the outside of the penny.

So we can conclude that  In this activity you will see that soap decreases the surface tension of water by satiuate water droplets on top of a penny.

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Answer:

The answer is 10.507 KJ

Explanation:

The formula you need to use for this question is MC(delta)T:

M=Mass ( 175g)

C=Specific Heat ( depends on the element, copper=0.38 j/g.k )

and T= Temperature, where you find the change in temperature by minusing the final T with the initial T.  

so, (175g)(0.38)(184-26)= 10,507 J

since we need the answer in KJ divide 10,507 by 1000

10,507/1000 = 10.507 KJ

The change in internal energy for the system is 5.656 kJ/ mole.

Internal energy is defined as the quality or state function that describes a substance's energy in the absence of capillary effects and the impacts of external magnetic, electric, and other fields. Geothermal heat from the earth's core and high-temperature mantle is the main source of internal energy for the planet.

Given,

Δq = 7.070 kJ

P∆V = 1.414 kJ

As we know that

Δq = ΔU + P∆V

So, ΔU = Δq - P∆V

ΔU = 7.070 kJ - 1.414 kJ

ΔU  = 5.656 kJ / mole

Thus, the change in internal energy for the system is 5.656 kJ/ mole.

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Answer:

(e) 148.2. However, it should be expressed only to 3 significant figures since 2.00 only has 3.

At constant temperature and volume, more I2 is added to the above equilibrium. A new state of equilibrium results from a shift to the:

Left with a net decrease in [H2].

Hence, Option A is correct .

What do you mean by equilibrium in chemistry?

Chemical equilibrium, can be defined as the reversible chemical reaction in which there is  no net change in the amounts of reactants and products. Types of chemical equilibrium are  Homogeneous Equilibrium and Heterogeneous Equilibrium

It plays a important role in chemical reaction

Rate of forward reaction =  Rate of backward reaction.

Hence , At constant temperature and volume, more I2 is added to the above equilibrium. A new state of equilibrium results from a shift to the:

Left with a net decrease in [H2].

Hence, Option A is correct .

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Answer:

Rubidium Cyanide and Water

Explanation:

An acetone with a density of 0.7857 g/mL and a mass of 0.3201 lbs will have a volume of 184.796 mL.

What is density?

The density of a substance is a function of its mass and volume. The variables are related to each other, such that:

Density = mass/volume.

Thus, given any two of the 3 variables, the third variable can be calculated by making it the subject of the formula.

Now to the problem at hand. The acetone has a density of 0.7867 g/mL and a mass of 0.3201 lbs. Because the unit of density is g/mL, the mass in lbs first needs to be converted to grams.

1 lb = 453.592 grams

0.3291 lbs = 0.3201 x 453.592

                  = 145.194 grams

Now, let's make volume the subject:

volume = mass/density

             = 145.194/0.7857

             = 184.796 mL

In summary, acetone with a density of 0.7857 g/mL and a mass of 0.3201 lb will have a volume of 184.796 mL.

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Explanation:

A mixture of a solid and a liquid

The small clay particles become suspended in the water. This kind of mixture is called a suspension. Suspensions are opaque; that means they are cloudy and we cannot see through them very well. The sugar dissolves in the water and the mixture is called a solution. Solutions are clear; that means we can see through them.

A mixture of a liquid and a liquid

Milk is not a single substance, but actually a mixture of two liquids! The one liquid component in milk is water, and the other is fatty oil. The reason milk is opaque is that tiny droplets of the oil is suspended in the water. When some liquids are suspended in liquid, we call the mixture an emulsion. Like suspensions, emulsions tend to be opaque.A mixture of vinegar and water is clear, and that is a clue that the mixture is a solution.

Solutions are special kinds of mixtures in which the particles are so well mixed that they are not separated from each other. We cannot make out separate substances.

A mixture of a gas and a gas

We learnt in that Materials that the particles of gases are far apart. This means that gases can mix very easily, because it is easy for their particles to move in amongst each other. The air we breathe is not a single gas but actually a mixture of gases

To research some substances pH 0 to less than 7 is acidic, 7 is neutral and more than 7 is neutral.

baking soda - base

Vinegar - acid

Distilled water - neutral

Pure rain - neutral

Ammonia -  nasic

Lemon juice -  acid

Hair and skin - acidic

An acid is a molecule or ion capable of both donating a proton, referred to as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid. the first class of acids are the proton donors, or Brønsted–Lowry acids.

An acid is any substance that in water answer tastes sour, adjusts blue litmus paper to red, reacts with a few metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions (acid catalysis). An acid is a substance that produces hydrogen (H+) ions when it's far delivered to water. A hydrogen ion is simply the proton and no electron

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¿What is a sulphurous gas?

Sulfur dioxide (SO) is a colorless gas with a pungent odor particular. Also called sulfite, it was used from centuries ago and its purpose is to preserve the aromas of the wine and the elimination of bacteria. It is also used in preservatives and antioxidants, and the food industries

They use it in dried fruit juices, jams and juices.

Answer:

Explanation:

Coffee is a drink prepared from roasted coffee beans. Darkly colored, bitter, and slightly acidic, coffee has a stimulating effect on humans, primarily due to its caffeine content. It is the most popular hot drink in the world. Seeds of the Coffea plant's fruits are separated to produce unroasted green coffee beans.

Lewis structure is a very simplified representation of the valence shell electron in a molecule

For Lewis structure of acetone then calculate the total number of valence electron for the acetone molecule and after determining how many valence electron there are in acetone and place them around the central atom to complete the octet and there are total 24 valence electron in the Lewis structure for acetone and it is used to show how electron are arranged around individual atom in molecule and electron are shown as dot or for bonding electron as a line between the  two atom

The Lewis structure of acetone are shown below

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Answer:

Most likely A

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M+1 peak is a small line 1 m/z unit to the right of the main molecular ion peak and the small peak is called as M+1 peak

Mass spectrum is a analytical tool useful for measuring the mass to charge ratio means m/z of one or more molecules present in a sample and these measurement can often be used to calculate the exact molecular weight of the sample components as well and M+ peak is usually the highest intensity peak in the cluster of peak at highest m/z and M+1 peak is a small line 1 m/z unit to the right of the main molecular ion peak and the small peak is called as M+1 peak

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We can change the freedom of movement in molecules of a substance by the addition or removal of heat.

Molecules are the smallest particles of a substance that are capable of independent existence and that still retain the properties of that substance.

The movement of the molecules of a substance is dependent on the strength of the force of attraction between the molecules of the substance.

The stronger the attractive forces between the molecules of a substance, the less free the molecules of the substance will be to move.

The molecules of a substance can acquire energy to overcome these attractive forces when heat is added to the substance.

Hence, an increase or decrease in the temperature of a substance will change the movement of the molecules of the substance.

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The volume of gas produced at 18 degrees Celsius 34.7 g of carbon dioxide gas creates of 623 mmHg is 0.03 L

The ideal gas equation is as follows;

PV=nRT

P,V,n,R,T are pressure, volume, number of moles, gas constant and temperature respectively

Substituting the values, we get

623xV=34.7/44x0.0821X291

623V=0.78X23.8911

623V=18.635

V=0.03 L

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The molarity of the barium hydroxide solution is 0.065M.

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

The molarity of a substance can be calculated using the following formula:

CaVa = CbVb

Where;

According to this question, an aqueous solution of barium hydroxide is standardized by titration with a 0.170 M solution of nitric acid. If 27.2 mL of base are required to neutralize 10.4 mL of the acid, the molarity of the barium hydroxide solution can be calculated as follows:

0.170 × 10.4 = Cb × 27.2

1.768 = 27.2Cb

Cb = 0.065M

Therefore, 0.065M is the molarity of the barium hydroxide solution.

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Answer:

Example problem

Explanation:

A 6.00 L sample at 25.0 °C and 2.00 atm contains 0.500 mol of gas. If we add 0.250 mol of gas at the same pressure and temperature, what is the final total volume of the gas?

Solution

The formula for Avogadro's law is:

V1/n1=V2/n2

V1=6.00 L

n1=0.500 mol

V2=?

;m

ml

n2=0.500 mol + 0.250 mol = 0.750 mol

V2=V1×n2/n1

V2=6.00 L×0.750mol

0.500

mol=9.00 L

The concentration of the specie is obtained as  0.79 M.

We know that a buffer is a solution that is resistant to changes in acidity and alkalinity. Now, we know that we have the following information;

pH = 10.00

Concentration of base = 0.18 M

Kb = 4.4 x 10 -4

Hence;

pOH = 14 - 10.00 = 4

pKb = -log( 4.4 x 10 -4)  3.36

Using the formula;

pOH = pKb + log [A-/AH]

4 = 3.36 + log[A-/0.18]

4 - 3.36 = log[A-/0.18]

Antilog(4 - 3.36) = [A-/0.18]

A- = Antilog(4 - 3.36) * 0.18

A- = 0.79 M

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Oxygen is inhaled to the lungs, and brought into the blood, which is known as diffusion . Our bodies exchange the oxygen for carbon dioxide, which is called respiration .The carbon dioxide is forced out of lungs by increasing the pressure of the lungs.

Respiration can simply be defined as the exchange of gases between an organism and its environment. In order words, it refers to the breathing in of oxygen and breathing out of carbon dioxide.

That being said, some few categories, levels or classes of respiration are known in living organisms:

So therefore, we can now confirm from the simple note given above that when substances such as oxygen moves from a region where it is highly concentrated to a region where it is of a lesser amount, it is known as diffusion.

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The energy of the eight shell of the hydrogen atom is obtained 0.2 eV

We know that from the Bohr model, the electrons that are in an atom can be arranged in energy levels. The energy levels of the atom are arranged in such a way that the levels that are lowest in energy are found nearer to the nucleus and the energy of the shells continue to increase outwards.

Thus, the energy of the eight shell would be much more than the energy of the first shell. Let us consider the formula;

E = - 13.6Z^2/n^2

Where;

Z = atomic number of the atom

n = The shell where the electron is

Thus;

E = - 13.6 * 1/8^2

E = -0.2eV

Thus the energy that an electron that we can find in the shall that has n = 8 would have the energy that is equivalent to 0.2eV.

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Taking into account the reaction stoichiometry,14.9856 L of O₂ are needed to react completely with 10.0 L of H₂S at STP?

In first place, the balanced reaction is:

2 H₂S + 3 O₂ → 2 SO₂ + 2 H₂O

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

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

First of all, you know that 10.0 L of H₂S react at STP. You can apply the following rule of three: if by definition of STP conditions 22.4 L of H₂S are occupied by 1 mole, 10 L of H₂S are occupied by how many moles?

moles of H₂S= (10 L× 1 mole)÷ 22.4 L

moles of  H₂S= 0.446 moles

To calculate the number of moles of O₂ required, the following rule of three can be applied: If by reaction stoichiometry 2 moles of H₂S react with 3 moles of O₂, 0.446 moles of H₂S react with how many moles of O₂?

moles of O₂= (0.446 moles of H₂S× 3 moles of O₂)÷2 moles of H₂S

moles of O₂= 0.669 moles

Now, you can apply the following rule of three: if by definition of STP conditions 1 mole of O₂ occupies a volume of 22.4 liters, 0.669 moles occupies how much volume?

volume= (0.669 moles× 22.4 L)÷ 1 L

volume= 14.9856 L

Finally, 14.9856 L of O₂ are needed.

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