i need help with chemistry equation

The concentration of KOH solution if 15 cm³ of 0.5 M HCl are exactly neutralised with 24 cm3 of solution of KOH is 0.313M.

The concentration of a solution can be calculated by using the following formula;

C₁V₁/C₂V₂ = na/nb

Where;

According to this question, a reaction between hydrochloric acid and potassium hydroxide forms water and potassium chloride as follows:

HCl + KOH → KCl + H2O

This suggests that na and nb values are both 1.

15 × 0.5 = 24 × C₂

7.5 = 24C₂

C₂ = 7.5/24

C₂ = 0.313M

Therefore, the concentration of KOH solution if 15 cm³ of 0.5 M HCl are exactly neutralised with 24 cm3 of solution of KOH is 0.313M.

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He takes photos of every piece of evidence before it is sent to the lab is what Sergeant Jeffers who likes photo array will do in this case and is denoted as option B.

This is defined as the process in which something is examined and it is usually accompanied with thorough search for facts so as to get accurate and meaningful results.

The use of photo arrays for investigation means that photos of every piece of evidence is taken which is worked on by the professional through series of techniques so as to catch the culprit and ensure justice is served.

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In the longstanding war between coyotes and sheep ranchers in New Mexico, studies show that coyotes kill sheep. The most likely explanation for the similarity in the percentage of sheep lost in other areas is that Another predator was killing sheep. Option B

This is further explained below.

Generally, A biological relationship known as predation occurs when one creature, known as the predator, hunts down and consumes another organism, known as the prey.

It belongs to the same group of common feeding behaviors as parasitism, micropredation, and parasitoids. Parasitism is a subtype of parasitoids.

In conclusion, Studies have shown that coyotes are the aggressors in the conflict that has been going on for a long time in New Mexico between sheep farmers and coyotes.

The hypothesis that another kind of predator was responsible for the loss of sheep in the same proportion in other locations is the one with the highest probability of being correct. Alternative B

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Explanation:

H₂PO₄⁻ (aq) + NH₃ (aq) ---> HPO₄²⁻ (aq) + NH₄⁺ (aq)

acid base conjugate base conjugate acid

H₂PO₄⁻ is donating a proton to NH₃. So H₂PO₄⁻ is acting like an acid, and NH₃ is acting as the base. Then, HPO₄²⁻ is the conjugate base of H₂PO₄⁻ and NH₄⁺ is the conjugate acid of NH₃.

Answer: b) acid

The effect of botulinum toxin cannot be determined using a yeast.

Botulinum toxin is produced by the bacterium called Clostridium botulinum. It is a neurotoxin that affects the nervous system. It is done by inhibiting a chemical called as acetylcholine.

Acetylcholine is a neurotransmitter that carries the message from the brain. It relays the message thus resulting in movement. If it is inhibited, the person would be paralyzed.

Yeast is a single-celled organism. It does not have well-developed systems as in multicellular organisms. In addition to that, the test organisms used to measure the effect of toxicity should be similar genetically to humans which would result in higher efficiency.

Thus, yeast cannot be used to determine the effect of botulinum toxin

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The Possible sub-claim in relation to Investigating Energy Systems is the Solar Cell System does have energy.

Evidence is that -

As the sun shines on a solar panel, energy is captured by the Photovoltaic cells on the panel. This is significant as it generates electrical charges which causes the flow of electricity.

These are accelerated by shifting an internal electrical field within the cell. Therefore, a solar cell system is one that has amount of energy.

A solar cell is also known as a photovoltaic cell. It is an electrical device which uses a natural physical and chemical phenomenon, a photovoltaic effect to convert light energy directly into the electricity.

Solar cells are known as photovoltaic cells. These PV cells converts sunlight directly into electricity. Solar cells produces electricity in remote locations which allows machines to be powered very far from the nearest electrical outlet. Solar cells are reliable and low-maintenance source of renewable energy.

Therefore, A PV cell can reflect and absorb, or pass via light that strikes it. The semiconductor material in PV cell conducts electricity better than an insulator.

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Answer:

P₂ = 1.18 atm

Explanation:

To find the final pressure, you need to use the Combined Gas Law equation:

[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]

In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure, volume, and temperature. After plugging the given variables into the equation, you can simplify/rearrange the equation to solve for "P₂".

P₁ = 536 pKa                     P₂ = ? pKa

V₁ = 2.50 L                        V₂ = 3.75 L

T₁ = 75.0 °C                       T₂ = 25.0 °C

[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]                                               <----- Combined Gas Law

[tex]\frac{(536 pKa)(2.50L)}{75.0^oC} =\frac{P_2(3.75 L)}{25.0^oC}[/tex]                          <----- Insert variables

[tex]17.87 =\frac{P_2(3.75 L)}{25.0^oC}[/tex]                                        <----- Simplify left side

[tex]446.7 = P_2(3.75 L)[/tex]                                      <----- Multiply both sides by 25.0

[tex]119 = P_2[/tex]                                                    <----- Divide both sides by 3.75

Finally, you need to convert the pressure from kilopascals (pKa) to atmospheres (atm).

101.3 pKa = 1 atm

 119 pKa                1 atm
---------------  x  --------------------  =  1.18 atm
                          101.3 pKa

Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new pressure of  gas is 1.18 atm.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of  gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 L.atm/K.mol

Combining Boyle's and Charles' gas law

P₁V₁/T₁ = P₂V₂/T₂

{ (5.28atm) (2.50 L)} ÷348 K ={ (P2) (3.75 L)} ÷298 K

P2 =1.18 atm

Therefore the new pressure of gas is 1.18 atm when the temperature is changed to348K and volume is increased to 3.75 L.

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Answer:Magnesium nitrate will react with sodium hydroxide to form magnesium hydroxide and sodium nitrate.

Explanation:

Answer:

675.99 g

Explanation:

1 mole of MgCl2 = 24.31 + 2(35.45) = 95.21 g

so mass of 7.10 moles = 7.10 x 95.21 = 675.991 g or 675.99 g

The chemical symbol for the ion will be  [tex]Ar^2^+[/tex]

The ion has a total of 16 electrons

The ion has a total of zero 3d electrons

The atom in question is a cation with a charge of +2.

The electron configuration goes thus: [tex]1s^2, 2s^2, 2p^6, 3s^2, 3p^4[/tex]

The total number of electrons of the ion of the atom can be calculated as:

2+2+6++2+4 = 16

With a charge of +2, it means two electrons have been lost. The total number of electrons in the atom would be:

16 + 2 = 18.

The symbol of an atom of a neutral element with 18 electrons is Ar. A neutral atom will have an equal number of protons and electrons. The number of protons in an atom is equivalent to the atomic number.

Thus, the atom is Argon with the symbol Ar.

The chemical symbol for the ion would, therefore, be [tex]Ar^2^+[/tex]

From the electron configuration, the ion has no 3d electrons. In other words, there are zero 3d electrons in the ion.

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Gas particles have not definite volume, so they spread out and occupy much space as possible.

There's a great deal of empty space between particles, that have plenty of kinetic energy and are not particularly interested in each other. Gas particles circulate very fast and collide with one another, causing them to diffuse, or spread out until they're evenly distributed all through the quantity of the container.

A gas is depend that has neither a hard and fast extent nor a set form. rather, a gas takes each the quantity and the form of its container. It spreads out to take up all to be had area.

They don't have any precise volume. This means that gases always spread out in all instructions to fill the field into which they may be positioned. This spreading out of gases to fill all of the available space is referred to as diffusion. They may be compressed effortlessly.

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The mass of water produced if 12.1 g of ethanol (C₂H₆O) undergoes the reaction is 14.2 g.

Ethanol is a natural compound. it is simple alcohol with the chemical components C₂H₆O. Its formula may be also written as CH₃−CH₂−OH or C₂H₅OH. Ethanol is a risky, flammable, colorless liquid with a characteristic wine-like odor and smelly taste.

Ethanol is used in the manufacture of medication, plastics, lacquers, polishes, plasticizers, and cosmetics. Ethanol is used in medicine as a topical antiinfective, and as an antidote for ethylene glycol or methanol overdose.

Balancing the reaction,

C₂H₆O (l) + 3O₂ (g) → 2CO₂ (g) + 3H₂O (l)

Mass of ethanol given = 12.1g

the molar mass of ethanol = 46 g

Therefore given mole = 46/12.1

                                    = 3.80 mole.

1 mole of ethanol = 3 moles of H₂O

∵ 46 g of ethanol = 54g of water

∴ 12.1 g of ethanol = 54g / 46 g × 12.1 g

                               = 14.2 g of ethanol produced.

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The time taken for 11.6% of the products to remain is 22.4 s.

The rate of reaction is the rate at which the reactants are depleted from the system or the rate at which the products appear in the system. Now we have a first order reaction. Recall that the formula of the first order reaction is written as;

ln[A] = -kt + ln[A]o

ln[A] = concertation at time t

t = time taken

k = rate constant

[A]o = initial concentration

Given that;

[A]  = 0.116[A]o and k = 0.0960 s−1

Then;

ln0.116[A]o = -0.0960t + ln[A]o

0.0960t  =  ln[A]o - ln0.116[A]o

0.0960t = ln([A]o/0.116[A]o)

0.0960t = ln(1/0.116)

0.0960t = 2.154

t = 2.154/0.0960

t = 22.4 s

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A solution to be supersaturated means more solute can still be dissolved in the solvent.

A solution is said to be supersaturated if it contains more solute than can effectively dissolve at a certain temperature. The injection of a tiny crystal of solute, known as a seed crystal, can start the recrystallization of the excess dissolved solute in a supersaturated solution.

A saturated solution is one that has dissolved the most solute possible at the temperature specified. A supersaturated solution is one that contains more solute than is necessary to reach saturation.

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By converting 21 miles/hr to centimeter we get :

938.784 cm/s

            dmi /thr = vmph

Steps to convert miles per hour to cm :

To convert 21 miles/hr to cm/s:

21 mph =

= (21 × 44.704)

= 938.784cm/s

21mph is 938.784cm/s

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We have the responses as;

1) The  solution is unsaturated

2) The solubility is 30 g of copper(II)sulfate

3) The solubility is  100g of ammonia

The term solubility has to do with the amount of solute that can dissolve in  solution at a given temperature. Let us recall that a solution is composed of a solute and a solvent. The solvent is the medium wherein the solute is dissolved.

1) Given the fact that the solubility of ammonia in water at 40 degrees Celsius is actually about 300 g/L t the follows that If you dissolved 54 grams of ammonia in 100 grams of water at tat temperature, the solution is regarded as unsaturated.

2) if about 15 g of copper(II)sulfate dissolves in  100 g of water at  3○C

x would dissolve in 200 g of water

x = 15 g * 200 g / 100 g

x = 30 g of copper(II)sulfate

3) About 100g of ammonia could be dissolved in 50g of water at 150C.

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TT is an example of homozygous pure recessive.

When the gene pairs (sometimes referred to as alleles) that regulate a trait's development are identical, the trait is said to be homozygous. Being heterozygous for a trait means having multiple alleles for that trait. A homozygous trait will always show itself in the same way.

An organism could be homozygous dominant (TT) or homozygous recessive (RR) ( tt ). When an organism has two separate alleles (Tt) for the same gene, it is said to be heterozygous (hetero- means different).

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In a chemical reaction, usually, we have something very standard, whatever is on the left side of the arrow will be Reactant, and whatever comes after the arrow will be product, so for this reaction:

Na2CO3 (aq) + MgSO4 (aq) -> Na2SO4 (aq) + MgCO3 (s)

The reactants will be: Na2CO3 and MgSO4

The products will be: Na2SO4 and MgCO3

The aq or s representation means the physical state in which the compound will be found in water, if it is aq, this means that the compound will dissolve in water and it will be found in an aqueous state. If the letter is s, therefore the compound will be a solid in water, forming a precipitate.

Since we have a double change in the positions of the elements, this will be called a Double Displacement reaction, in which we have:

AB + CD -> AC + BD

The equilibrium partial pressure of Nitrogen would be 0.0638 atm when a reaction vessel contains 4.5 atm of Br2 and 1.1 atm of NBr3.

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1) If the pressure increases, the equilibrium constant K does not change.

2) If the pressure increases, the concentration of H₂ decreases.

The reaction is given by:

CO + 2H₂    ⇄   CH₃OH            ΔH = -91.8 KJ

1) If the pressure increases, the equilibrium constant K does not change because the only factor affect the equilibrium constant k is the temperature.

2) If the pressure increases the equilibrium position shifted to right and increases the yield of product for this reaction .

                p ∝ n

Thus, using the given reaction

CO + 2H₂    ⇄   CH₃OH            ΔH = -91.8 KJ

1) If the pressure increases, the equilibrium constant K does not change.

2) If the pressure increases, the concentration of H₂ decreases.

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Four types of observations that indicates occurring of a chemical change are -

When a chemical change occurs, color of the product is changed. Chemical change is an irreversible change. It cannot be undone as physical change.

A chemical change is an exothermic reaction. A large amount of heat is released when a chemical change occur. As the product formed in a chemical change is changed in its state, color, etc. which requires a large amount of heat.

Precipitate formation occurs in a chemical change as chemical change occurs in aqueous solution where two ionic bonds combine and forms insoluble salt called precipitate.

A chemical reaction releases off a gas. An example is reaction of baking soda and lemon juice. It releases carbon dioxide gas.

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Ganymede is the largest satellite (moon) in the Solar System, larger than the planet Mercury. Ganymede is classified as a satellite instead of a planet as it orbits a planet, and not the Sun.

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All the lead ions will not be removed and 6.502 ×10-8 moles of lead ions remain in solution.

The equation of the reaction is;

Pb(NO3)2(aq) +  Na2S(aq) ---------> PbS(s) + 2NaNO3(aq)

Number of moles of Pb(NO3)2 = concentration × volume

Number of moles of Pb(NO3)2 = 11.2 mL/100   × 7.10×10-3 M = 7.952 ×10-8 moles

Number of moles of  Na2S = 12.4 mL/1000 ×  0.0117 M = 1.45  × 10-8 moles

Since the reaction is 1:1, 7.952 ×10-8 moles of Pb(NO3)2 should react with  7.952 ×10-8 moles of Na2S in order to remove all the Pb^2+ ions but we have only 1.45  × 10-8 moles of  Na2S  hence all the lead ions will not be removed.

Amount of lead ions remaining =  7.952 ×10-8  -  1.45  × 10-8 moles

= 6.502 ×10-8 moles of lead ions

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Titration is a common laboratory method for quantitative chemical analysis to determine the concentration of an identified analyte. The reagent, sometimes referred to as the titrant or titrator, is prepared as a standard solution with a specified concentration and volume.

Titration is the continuous addition of one solution with a known concentration (referred to as a titrant) to a known volume of another solution with an unknown concentration when a reaction reaches neutrality, which is occasionally marked by a color change.

Utilizing methyl orange indicator, a sodium carbonate solution and a hydrochloric acid solution can be titrated. The solution will be mildly acidic at the end point when a weak base is titrated with a strong acid. The solution becomes slightly basic when a weak acid is titrated with a strong base because the salt that results will partially hydrolyze.

Below is a list of the chemical processes that took place during this titration.

NaCl(aq) + CO2(g) + H2O → Na2CO3(aq) + 2HCl(aq)

CO2(g) + H2O  →  CO32-(aq) + 2H+(aq)

Acid and base titrations have an end point when the acid and base amounts are chemically identical. When a strong acid and a strong base are titrated, the solution neutralizes at the end point.

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Calculated with significant figures is 2804.4, which contains 5 sig figs and 1 decimal.

Three rules are used to determine the number of significant digits Non-zero numbers are always valid. All zeros between two significant digits are valid. Only trailing zeros or trailing zeros in the fractional part are significant. Enter a number or formula to calculate the number of digits and decimal places in your answer. contains 1 significant digit.

All zeros between two non-zero digits are valid. For example, 108.0097 contains 7 significant digits. Zeros to the right of the decimal point and to the left of non-zero digits have no meaning. For example, 0.00798 contained 3 significant digits. For example, the 3-digit power of 20,499 is 20,500. The first digit to round down is 9 so round up. 0.0020499 to 3 significant digits are 0.

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The concentration of the oxonim ion is 0.0099 M while the pH of the solution is 2.

The term Ka means the acid dissociation constant. This speaks of the extent to which the acid is able to become dissociated in water. We know that is an acid is able to dissociate completely in water then the acid is a strong acid. However, if the acid is not able to dissociate complete in solution then the acid is a weak acid.

We can now set up the ICE table as we would show below;

      HNO2(aq) + H2O (l) ⇔ H3O^+(aq)  + NO2^-(aq)

I      0.145                                 0                     0

C       -x                                    +x               +x  

E     0.145 - x                            x                   x

Ka = 7.2x10^−4

Ka = [H3O^+] [NO2^-]/[ HNO2]

7.2x10^−4 = x^2/0.145 - x  

7.2x10^−4(0.145 - x) = x^2

1.044 * 10^-4 - 7.2x10^−4x = x^2

x^2 +  7.2 * 10^-4x - 1.044 * 10^-4 = 0

x=0.0099 M

Then we know that  [H3O^+] = [NO2^-]

Thus;

pH = - log(  [H3O^+])

pH = - log(0.0099 M)

pH = 2

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nswer

C. Cr₂O₃ (s)

Explanation

An oxidizing agent is a substance that causes oxidation by accepting electrons; therefore, its oxidation state decreases.

A reducing agent is a substance that causes reduction by losing electrons; therefore its oxidation state increases.

The simplest way to answer this is that the oxidizing agent is the substance that is reduced, while the reducing agent is the substance that is oxidized.

Therefore, CrA

By balancing the element that appears in the fewest different formulas of the combustion reaction of propane, the coefficient that must be added to the CO₂ to balance the element C is 3.

A combustion reaction is a reaction that involves the release of large amounts of heat and light energy.

Combustion reactions include the burning of hydrocarbons in the air to produce carbon dioxide and water.

Considering the given question below:

What is the balanced equation of the reaction for the combustion of propane?

The balanced equation of the reaction for the combustion of propane is given below as follows:

C₃H₈ (g) + 5 O₂ (g) ---> 3 CO₂ (g) + 4 H₂O (l)

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Answer:

False

Explanation:

Atoms are neutral Ions carry a charge. Take a look at the groups in the periodic table for extra help in understanding this.

Let's see the definition of each concept:

An element is a substance only formed by atoms of the same element. For example, Na (sodium), O2 (oxygen), C (carbon).

A compound is a substance formed by the combination of two or more elements, through a chemical bond. For example, H2O (water), and CO2 (carbon dioxide).

A pure substance can be an element or a compound, which is alone in the media. For example, the O2 present in an oxygen bullet is pure, because it is only oxygen.

A mixture is when you have 2 or more elements or compounds present in the same media. For example, the air is a mixture of oxygen and nitrogen.

Then, the answer is that NaCl is a compound and a pure substance.