what is meaning of product and reactant ​

Answers

Answer 1

Answer:

Reactants are starting materials and are written on the left-hand side of the equation. Products are the end result of the reaction and are written on the right-hand side of the equation.


Related Questions

Write an equation for the reaction that occurs when a few drops of hydrochloric acid are added to the buffer. (nac2h3co2) of a 0.150 m acetic acid (h c2h3co2, ka = 1.8 10-5)

Answers

The equation for the reaction occurs when a few drops of hydrochloric acid are added to the buffer is:

[tex]NaOH[/tex] + [tex]Na[/tex][tex]C_{2[/tex][tex]H_{3}[/tex][tex]O_{2}[/tex] → [tex]HC_{2} H_{3} O_{2}[/tex] + [tex]Na_{2}O[/tex]

The NH3 uses the extra H+ ions that were added to the system by the addition of HCl (strong acid) to produce [tex]NH_{4}[/tex]+. Since all extra H+ ions have been captured and changed. The pH of the system hasn't altered significantly; [tex]NH_{4}[/tex]+ is a weaker acid.

When a strong acid (H3O+) is given to the buffer solution, the conjugate base in the buffer eats the hydronium ion, converting it into the water and the conjugate base's weak acid. As a result, there are more weak acids present and fewer conjugate bases as well.

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The half-life of nickel-65 is 2.50 days. how much of a 100.-g sample remains after 7.50 days?

Answers

12.5g of a 100.-g sample remains after 7.50 days.

What is half-life?

Half-life is the amount of time required for a substance's radioactivity to decrease to half its initial value, whereas mean life is the average lifetime of all the nuclei of a specific unstable atomic species.

Knowing about half-life is helpful for calculating steady-state concentrations and excretion rates for each particular drug.

Despite the fact that individual medications' half-lives vary, they always adhere to the same principle: 50% of the initial drug dose leaves the body after one half-life.

The half-life of xenon-124, or the typical amount of time needed for a collection of xenon-124 atoms to decay by half, is about 18 sextillion years (1.8 x 1022 years), or roughly 1 trillion times the universe's present age.

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A solution of cacl2 in water forms a mixture that is 28.0alcium chloride by mass. if the total mass of the mixture is 663.2 g, what masses of cacl2 and water were used?

Answers

Mass of CaCl2 = 663.2 g x 28% = 185.696g

So, Mass of water = Total mass - Mass of CaCl2 = 663.2 g - 185.696 g

⇒ Mass of water = 477.504g

What is Mass?Mass is a physical body's total amount of matter. It also serves as a gauge for the body's inertia, or resistance to acceleration (change in velocity) in the presence of a net force. The strength of an object's gravitational pull to other bodies is also influenced by its mass.The kilogram is the primary mass unit in the SI (kg).While weight has to do with how strongly a gravitational field is drawing matter in, mass is the quantity of matter. As a result, while the weight will fluctuate depending on the quantity of mass and how far away the body is from the center of gravity, the mass is a more or less absolute dimension.

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Does a reaction occur when aqueous solutions of lead(ii) nitrate and aluminum sulfate are combined?

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Yes, the reaction will occur .

Al2(SO4)3+3Pb(No3)2  →3PbSO4+2Al(NO3)3.

How can you tell whether a chemical equation has no reaction?

We use the (aq) mark to indicate a substance dissolves if it is soluble. We employ the (s) label with a substance and anticipate that it will precipitate out of solution if it is not soluble. There won't be any expected reaction if everything is solvable.

When aqueous solution of lead (II) nitrate and aluminium chloride are combined, lead(II) chloride will precipitate.

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9)
Solve the question above:

A car with a 14-gallon gas tank gets 22 mpg gas mileage. How far can the car travel on a full tank of gas?

distance traveled on a full tank = ? miles

Answers

A car with a 14 gallon gas tank get 22 mpg gas mileage. The distance traveled by a car on full tank is 308 miles.

capacity of car tank = 14 gallon

mileage of car = 22 mpg ( miles per gallon )

distance traveled on a full tank = ?

to find out the distance traveled by a car on full tank of gas,

distance traveled on full tank = capacity of car tank × mile per gallon

                                                 =  14 gallon × 22 miles / gallon

                                                 = 308 miles.

Thus , A car with 14 gallon gas tank get 22 mpg gas mileage. the distance traveled by a car on a full tank of gas is 308 miles.

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How many atoms of carbon are present in 8.06 grams of carbon tetrabromide ? atoms of carbon .

Answers

1.463×10²² atoms of carbon are present in carbon tetrabromide.

m(CBr₄) = 8.06 g; mass of carbon tetrabromide

M(CBr₄) = 331.63 g/mol; molar mass of carbon tetrabromide

n(CBr₄) = m(CBr₄) ÷ M(CBr₄)

n(CBr₄) = 8.06 g ÷ 331.63 g/mol

n(CBr₄) = 0.0243 mol; amount of carbon tetrabromide

There is one carbon atom in one molecule of carbon tetrabromide: n(CBr₄) : n(C) = 1 : 1

n(C) = 0.0243 mol; amount of carbon atom

N(C) = n(C) × Na.

N(C) = 0.0243 mol × 6.022·10²³ 1/mol.

N(C) = 1.463×10²² atoms of carbon in carbon tetrabromide

Na - Avogadro constant or Avogadro number.

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The pka of nh4 /nh3 is 9.25. calculate the ph of a solution containing 0.12 m nh4cl and 0.03 m naoh.

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The pH of given  solution is 8.77. It can be calculated by the pka value of NH₄/NH₃ and molar concentrations of both the ionic compounds.

A solution containing 0.12 NH₄Cl and 0.03 moles of NaOH undergoes a reaction in which NaOH reacts with NH₄Cl to form NaCl, producing NH₃ and H₂O.

NH₄Cl + NaOH = NH₃ + NaCl + H₂O

The pH is therefore equal to the sum of the pKa and the logarithm of the base concentration divided by the acidity. In both cases the base concentration is 0.03 molar. When sodium hydroxide is added, 1 mole of ammonia is produced for each mole added. The result is less ammonium with each addition of hydroxide.

This is how we come to a solution.

pH = pKa + log [base]/log [acid]

pH = 9.25 + log 0.03/log 0.12

pH = 8.77

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What is the maximum length of a stem used for pendant lighting before bracing is required?

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With no additional bracing needed, the maximum length of the stem utilized for pendant lightning is 12 in. (300 mm) or less. Lateral braces or an explosive flexible coupling must be utilized within 12 inches of the lightning fixture if the length is greater than 12 inches.

If you're planning on installing pendant lighting in your home, you'll need to be aware of the maximum length of the stem that can be used. According to the National Electric Code, the maximum length of the stem for pendant lighting is 12 inches (300 mm) or less. If the length of the stem is greater than 12 inches, you'll need to use lateral braces or an explosive flexible coupling within 12 inches of the lightning fixture. This will help to ensure the safety of your home and prevent any damage from occurring.

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An atom in its ground state contains 18 electrons. how many of these are in orbitals with ml = 0?

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There are 6 electrons present in the orbital containing (ml=0).

Let the element be X. Now its electronic configuration will be

For 's' orbital the value of l = 0

X(18) = 1s^2, 2s^2, 2p^6, 3s^2, 3p^6

With this electronic configuration, three sublevels are present for the 's' orbital which are 1s^2, 2s^2, and 3s^2 respectively.

Now, let's calculate the electrons in the 's' orbital with l = 0

1s^2, 2s^2, 3s^2 = 2 + 2 + 2

1s^2, 2s^2, 3s^2 = 6

Thus, an atom containing 18 electrons in its ground state has 6 electrons.

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You poured out a little (or a lot) too much of a chemical solution. it is ok to pour it back into the bottle.
a) true
b) false

Answers

(b) false

It is not ok to pour it back in the bottle

Once a chemical is taken outside its bottle or container , it reacts with various gases present in the natural environment and also with those chemical which are being released in that laboratory.This will become a source of possible contamination for the entire contents of the stock bottle.The disposal of entire chemicals should be done as per instructed on the reagent bottle to prevent any dangerYou should never put the used spatula inside the reagent bottle.Do not put the excess chemicals inside the sink also , dispose it as it was instructed on the reagent bottle.

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What is the charge on the central metal atom, the coordination number, and the overall charge for the complex ion in the compound, nh4[fe(nh3)2(cn)4]?

Answers

The charge on the central metal atom is +3.

The coordination number is 6.

The overall charge for the complex ion in the compound is -1.

Iron is the central atom in the complex ion.

The overall charge for the complex ion in the compound is -1, because it is connected to ammonium cation.

Ammonium cation (NH₄⁺) has charge +1.

The compound must have the neutral charge.

Iron is connected with six ligands.

Ligand NH₃ has no charge, while the ligand CN has charge -1.

Overall charge for the complex ion = z(Fe) + 4 × (-1) = -1

z(Fe) = +3; the charge on the central metal atom.

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For the amino acid alanine, the major species in solution at ph 7 is the zwitterionic form, which has a negatively charged carboxylic acid group and a positively charged amino group. There is a less common neutral form in which neither group is charged. The carboxylic acid group of alanine has a pka of 3. The amino group of alanine has a pka of 8. Estimate the ratio of the concentration of the neutral amino acid species to the zwitterionic species at ph 7.

Answers

The ratio between the neutral and the zwitterionic form of alanine at pH 7 is 1:100000.

Since the carboxylic group has a pKa of 3, that means that at pH 3 the ratio between its protonated and deprotonated (charged) form is 1:1. The difference between pH 7 and pH 3 is 7 - 3 = 4, which means that (because pH is a negative logarithm), pH 7 is 10000 times more basic than pH 3. This implies that the ratio between the protonated and the deprotonated form of the carboxylic group is 1:10000.
A similar calculation can be applied to the amino group. 8 - 7 = 1, so at pH 7, the ratio between its protonated (charged) and deprotonated form will be 10:1.
We then multiply these two ratios to get a ratio of neutral:zwitterionic = 1:100000.

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A+bare+helium+nucleus+has+two+positive+charges+and+a+mass+of+6.64+10-27+kg.+(a)+calculate+its+kinetic+energy+in+joules+at+7.20%+of+the+speed+of+light.

Answers

A+bare+helium+nucleus+has+two+positive+charges+and+a+mass+of+6.64+10-27+kg.+  7.57×105 eV.

What is nucleus?

When you look at a photograph of a cell, the nucleus is among the elements that is most evident. The nucleus, located in the centre of the cell, is home to all of the chromosomes, which are responsible for encoding the genetic material. Consequently, it is crucial to safeguard this area of the cell.

The membrane that surrounds the nucleus maintains all of the chromosomes inside and distinguishes between the chromosomes being inside the nucleus and the other organelles and parts of the cell remaining outside. There are pores in the nuclear membrane that enable molecules to enter and exit the nucleus as necessary, such as when RNA needs to move between the nucleus and the cytoplasm.

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What is the net force and direction of the block?

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Answer:

We know that the forces are added if they are in the same direction and they are subtracted if they are in opposite directions. So, the net force = 10 N (North) + 10 N (North) = 20 N (North) and 8 N (West) - 8 N (East) = 0. Therefore the net force on the block is 20 N in the North direction.

I REALLY NEED HELP WITH THIS ASSIGNMENT!

Answers

The maximum number of significant figure of the reading obtained in the thermometer is 3.

What is significant figure?

Significant figures are used to establish the number which is presented in the form of digits.

A significant figure is a figure or a digit that contributes to how accurately something can be measured.

For the given thermometer, the reading of the digits is in 2 significant figure and the calibration is in one digit.

combining the 2 digits of reading and 1 digit calibration gives 3 significant figures.

Thus, the maximum number of significant figure of the reading obtained based on the calibration of the thermometer is 3.

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A+14-karat+gold+ring+contains+58.3%+gold+and+weighs+12.41+g.+if+gold+sells+for+$308.00/ounce,+what+is+the+value+of+the+gold+in+the+ring?

Answers

The value of the gold in the ring is $78.50.

m(ring) = 12.41 g; mass of the ring

m(Au) = 0.583 × 12.41 g

m(Au) = 7.235 g; the mass of gold in the ring

m(Au) = 7.235 g × 0.0352 g/ounce

m(Au) = 0.255 ounce

value = 0.255 ounce × $308.00/ounce

value = $78.50; the value of the gold in the ring

Karat is a measure of the purity of gold.  A gold karat is 1/24 part of the whole.

Gold is very ductile and can be drawn into a monoatomic wire or used in the production of rings.

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Why don’t hydrogen ions appear in equation for half reaction occurring in basic solution

Answers

In a basic solution, the hydrogen ions do not  appear in equation for half reaction.

What is a redox reaction?

A redox reaction is one that involves the loss or gain of electrons. The electrons that are lost in one half equations are gained in the other half equation hence the process is synchronous. The electrons do not disappear in the process.

It is usual in some cases to use hydrogen or hydroxide ions to balance the atoms in the half equations. This occurs when the reaction is taking place in an acidic or a basic solution.

When the reaction takes place in a basic solution, there are no hydrogen ions present but only the hydroxide ions are present. Thus in a basic solution, the hydrogen ions do not  appear in equation for half reaction.

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Janice measured the mass and the volume of an object. She then determined the density of the object by dividing the object’s mass by its volume (D = ).

Which value would most likely represent the density of the object?

–1 g/cm3
4 m/s
–3 m/s
6 g/cm

Answers

The value which is  most likely represent the density of the object is option d. 1 g/cm³

Density is described as the ratio of mass to extent of an item. Density is immediately proportional to mass and inversely proportional to quantity, this is, density increases with boom in mass and reduces with growth quantity.

The unit of density is gram in line with cubic centimeter (g/cm³).

Density = [tex]\frac{mass}{volume}[/tex] =  [tex]\frac{g}{cm³}[/tex]

unit of mass can be gram, kilogram etc.

unit of volume is, metre³ etc.

The key distinction among density and weight is that weight is a degree of the amount of depend in an object, whereas density measures the quantity of depend in a unit volume.

Density is an crucial concept because it permits us to decide what substances will flow and what materials will sink when placed in a liquid. commonly, substances waft so long as their density is less than the density of the liquid.

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A block has a mass of 4.726 g and a volume of 128.9 cm3. calculate the density in g/cm3.

Answers

Density = mass/volume

  ρ=[tex]=m/v[/tex]

density = 4.726/128.9

density = 0.0366 g/cm3.

What is density?

The term "density" refers to the quantity or mass per unit of volume in a particular substance. Mass divided by volume is the formula for calculating density.

Absolute density and relative density are the two main types of density. Relative density, also known as specific gravity, is the ratio of a substance's density to the density of a reference material. The reference substance is often water.

The formula to calculate density is the mass of an object divided by its volume. The standard units are kg/m3.

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What are anisotropic azobenzene materials? how is the structure of the compounds related to this phenomenon?

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Anisotropic azobenzene materials are photoresponsive materials, very important in photochemistry.

The π-conjugated system and ring-substitution in azobenzene gives specific absorption in the UV-visible range of the spectrum.

Anisotropy is the property of a material which allows it to assume different properties in different directions.

Azobenzene is an aromatic molecule where two phenyl rings are connected with azo bond (–N=N–); see the picture below.

Azobenzene has the mesogenic property.

Anisotropic azobenzene materials have photoresponsive properties such as birefringence, phase transition, photoinduced colloidal deformation, surface-relief-gratings, bending, spontaneous surface pattern and dichroism.

The spectra of the cis- and trans-azobenzenes are distinct but overlapping.

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Calculate the fluoride ion concentration and ph of a solution containing 0.10 mol of hcl and 0.20 mol of hf in 1 l of solution. ka for hf equals 6.8 * 10-4.

Answers

The fluoride ion concentration is 1.4 x [tex]10^-^3[/tex], and the solution's pH is 1.

The main species in solution are [tex]H^+[/tex], [tex]Cl^-[/tex], HF, and the solvent [tex]H_2O[/tex] since HCl is a strong acid and HF is a weak acid. The question requests the fluoride ion concentration [[tex]F^-[/tex]], which are created when HF is ionized. Consequently, the crucial equation is:

                                  [tex]HF (aq) \leftrightarrow H^+ (aq) + F^- (aq)[/tex]

Equilibrium           0.20 – x mol   0.10 + x mol  0 + x mol

Equilibrium constant = 6.8 x [tex]10^-^4[/tex]

[tex]Ka = \frac{[H^+][F^-]}{[HF]}[/tex]

6.8 x [tex]10^-^4[/tex] = [0.10] [x] / [0.20]

x = (0.20 / 0.10) x 6.8 x [tex]10^-^4[/tex]

x = 1.4 x [tex]10^-^3[/tex]

Fluoride ion concentration, [[tex]F^-[/tex]] = 1.4 x [tex]10^-^3[/tex]

[[tex]H^+[/tex]] = (0.10 +x) = 0.10M

Thus, pH = 1.00 since it is entirely from HCl and HF has negligible contribution.

Result:

The fluoride ion concentration is 1.4 x [tex]10^-^3[/tex] and the pH of the solution is 1.00.

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Copper has two isotopes: Cu-63, and Cu-65. The percent abundance of Cu-63 is
69.1%. What is the average atomic mass of copper? Assume the masses listed
are 63.000 and 65.000.

Answers

Answer:

63.6 g/mol

Explanation:

If the percent abundance of Cu-63 is 69.1%, then Cu-65 is 30.1% since

100%-69.1%= 30.1%

To find the average atomic mass, multiiply the percentage with the corresponding mass then add the answers together.

(63 x 69.1%) + (65 x 30.1%) = average atomic mass

(63 x .691) + (65 x .301) = 43.533 + 20.085 = 63.618 g/mol = 63.6 g/mol

Calculate the volume in milliliters of a 0.875 m sodium sulfate solution containing 8.90 g of sodium sulfate?

Answers

The volume of the solution in milliliters is 60 mL.

Mass of sodium sulfate = 8.90 g

Molarity of solution of sodium sulfate = 0.875 M

Number of moles sodium sulfate is,

[tex]Number \: of \: moles = \frac{ Mass}{ Molar \: mass}[/tex]

[tex]n = \frac{m}{ M}[/tex]

[tex] = \frac{8.90}{142} [/tex]

= 0.06 moles

There are 0.06 moles of sodium sulfate.

The volume of the solution is,

[tex]Molarity = \frac{Number \: of \: moles \: of \: sodium \: sulphate}{ Volume \: of \: the \: solution }[/tex]

[tex]Volume \: of \: the \: solution = \frac{ Number \: of \: moles \: of \: sodium \: sulphate }{Molarity}[/tex]

[tex] = \frac{0.06} {0.875}[/tex]

= 0.06 L

The volume of the solution is 0.06 L.

The volume of the solution is milliliters is,

1 L = 1000 ml

0.06 L = 0.06 × 1000

= 60 mL.

Therefore, the volume of the solution in milliliters is 60 mL.

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When sodium oxide is added dropwise to a buffered solution the_____ component of the buffer consumes the added hydroxide ion

Answers

When sodium oxide is added dropwise to a buffered solution the weak acid component of the buffer consumes the added hydroxide ion.

What is a buffer?

A weak acid and its conjugate base must be present in a buffer. A solution containing these two components can be made in several ways: buffers can be made from weak acids or bases and their salts.

When a buffer is present in the solution, the hydroxide (OH-) ions react with the weak acid in the buffer solution rather than with water, resulting in water and A- ions.

Thus, the weak acid of the buffer absorbs the excess hydroxide ions from the solution.

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What+is+the+major+disadvantage+of+using+concentrated+sulfuric+acid+rather+than+85%+phosphoric+acid+for+the+dehydration+of+alcohols?

Answers

The major disadvantage of using concentrated sulfuric acid rather than 85% phosphoric acid for the dehydration of alcohols is that concentrated sulfuric acid produces messy results.

Concentrated sulfuric acid or concentrated phosphoric(V) acid (H₃PO₄) are used in alcohol dehydration.

Concentrated sulfuric acid eliminates a water molecule from the organic molecule in a dehydration reaction.

Sulfuric acid (H₂SO₄) is a strong acid and a strong oxidizing agent.

It oxidizes the alcohols to carbon dioxide, while it is reduced to sulfur dioxide. Reaction is very exothermic, release a lot of energy.

Sulfuric acid is strong diprotic acid. It dissociates on hydrogen cations (H⁺) and sulfate anion (SO₄²⁻).

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A student is trying to identify an unknown mineral sample. The sample has a mass of 150 g and displaces 30 mL of water. Which mineral does the student have

please helpp

Answers

Pyrite (density=5 g/cm

When a carbonate reacts with an acid it produces carbon dioxide, a salt, and what other product? Give the name, not the formula​

Answers

A salt, water, and carbon dioxide are produced when acids react with carbonates, such as calcium carbonate (found in chalk, limestone, and marble). Fizzing is the result of the reaction's bubbling, which is caused by the carbon dioxide.

What happen when a carbonate reacts with an acid ?

Salt, carbon dioxide, and water are produced when an acid combines with metal carbonate.

An illustration of this reaction is the formation of sodium chloride, carbon dioxide, and water when diluted hydrochloric acid combines with sodium carbonate.

2NaCl (aq) + CO2 (g) + H2O = Na2CO3(s) + 2HCl (aq) (l)

Because the acid is neutralised in these reactions, they are known as neutralisation reactions. In other words, the pH of the mixture approaches 7, or the acid and base (carbonate) are neutralised.

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151 grams of SO2 is equal to how meany moles

Answers

Answer:

151 g SO₂ × [1 mol SO₂/64.06 g SO₂] = 2.36 mol SO₂

Explanation:

Molecules that increase the production and release of neurotransmitters are known as?

Answers

Molecules which increase neurotransmitter formation and release are termed as calcium.

The release of neurotransmitter molecules is triggered by an increase in calcium. When a neuron becomes depolarized and reaches a threshold, it sends an electrical signal called the action potential down the axon. When the action potential reaches the terminal, voltage gated calcium channels open. This causes an influx of calcium, which binds to proteins and allows the fusion of neurotransmitter-filled vesicles with the membrane. This results in the release of increased level of neurotransmitter into the synapse, where it can cause changes in the postsynaptic cell.

What are Neurotransmitters?

Neurotransmitters are chemicals that neurons release in order to communicate with other neurons or effector tissues such as muscle. There are various types of neurotransmitters, each with a unique effect on the postsynaptic cell.

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3AgBr+GaPO4→Ag3PO4 +GaBr3
43g 54g 25g ?

What is the mass of GaBr,?

Is the reaction above a physical or chemical change?

How do you know?

Answers

1. The mass has to be 72g
2. Chemical change, this is because it is a reaction and substances are being created.
Other Questions
Do you think persecution of Christians made Christianity weaker or stronger? Explain. What impact did the Justinian Code have on The Byzantine Empire? (Please help who knows the answer)A. It built the Grand Cathedral C. It was the law of the land B. It constructed schools D. It honored Hagia Sophia 4.on june 1 1 bob emails cindy and offers to sell her 20 lawn mowers. three days later bob revokes his offer. both bob and cindy are merchants. under article 2 can bob revoke this offer? explain HELP ME OUT PLEASE!!!!! _______ are creations which include major copyright-protected elements of an original A) Fair Use Doctrine B) Derivative Works C) Intellectual Property D) Copyrighted What role do you think goals would play in planning the change in a company? List some goals you think might be important. (Make sure these goals have the characteristics of SMART goals Select the correct text in the passage. Which detail foreshadows the central idea that Frantz's world is about to change? (1)... For a moment I thought of staying away from school and wandering about the field could hear the blackbirds whistling on the edge of the wood, and in the Rippert field, beh through their drill. All that was much more tempting to me than the rules concerning part resist, and I ran as fast as I could to school. As I passed the Mayor's office, I saw that there little board on which notices were posted. For two years all our bad news had come from conscriptions, orders from headquarters; and I thought without stopping (2) "What can it be now?" (3) Then, as I ran across the square, Wachter the blacksmith, who stood there with his ap out to me: (4) "Don't hurry so, my boy; you'll get to your school soon enough!" (5) I thought that he was making fun of me, and I ran into Monsieur Hamel's little yard al Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.55 and a standard deviation of 0.43. Using the empirical rule, what percentage of the students have grade point averages that are between 2.12 and 2.98 ? A nurse is inspecting the iv site of a client and notices that the site is swollen, red, warm to the touch, and painful. which action by the nurse is appropriate? guess the game and name of the skin :) Essay about a european country PLEASE HELP How did the writers of the Constitution attempt to stop the federal government from becoming tyrannical? (4 points)(a) Powers were to be distributed among numerous smaller groups as articulated in Federalist No. 51.(B)The executive branch was given veto power to stop any judicial decision thought to hurt the people.(C)The legislative branch was separated into cabinet departments to limit the enforcement of laws.(d)The judicial branch was granted the power of judicial review, which elevated the judiciary to equal standing For f(x)=-4 x+1 , what is the output for the given input?b. 0 how can mammal are more intilligent than human A certain star is 3.9 x 10^2 light years from the Earth. One light year is about 5.9 x 10^12 miles. How far from the earth (in miles) is the star? Twice a number minus 5 is 7 How does the indian leader interpret french migration from europe to north america? If the production possibilities frontier is ________, then opportunity costs are constant as more of one good is produced. It is rare to see a baseball player or football player stay in the professional game past age 40. What contributes to this phenomenon?1. Drug use and steroid overdose2. Increase in illness3. Decline in vision, strength, reaction time and stamina as we age4. Younger players push them out of the game Pls help only one question :( im stuck! Find the next two terms in each sequence. Write a formula for the n th term. Identify each formula as explicit or recursive. 49,64,81,100,121, ......