Calculate the mass of 0.5mol of sodium chloride, NaCl. GIVIN 50 POINTS AND BRAINLY

The acetate buffer pH. 3.7 should be used.

What is buffer and how to prepare?

A buffer is a solution that helps to maintain a stable pH level when acids or bases are added to it. It is composed of a weak acid and its conjugate base, or a weak base and its conjugate acid. Buffers are commonly used in chemical reactions, to maintain the pH of a solution at a certain level. To prepare a buffer, one must choose the desired pH and then select the appropriate weak acid or base and its conjugate partner. The weak acid and its conjugate base, or the weak base and its conjugate acid, must then be mixed in the correct proportions to create the desired buffer. The amount of acid or base added to the buffer solution can then be monitored to ensure the pH remains constant.

Dissolve 10g of anhydrous sodium acetate in 300ml of water, adjust the ph. to 3.7 with glacial acetic acid and dilute with water to 1000ml.

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Answer:

The protons and electrons of an atom are attracted to each other. They both carry an electrical charge. Protons have a positive charge (+) and electrons have a negative charge (-). The positive charge of the protons is equal to the negative charge of the electrons.

Explanation:

Please give the brainliest.

Aspirin is an effective pain reliever (i.e. analgesic), fever reducer (i.e. antipyretic) and anti-inflammatory agent and is one of the most widely used non-prescription drugs. It is synthesized by the esterification of salicylic acid with acetic anhydride in presence of little amount of an acid as a catalyst.

After completion of synthesis, to identify the presence of unreacted salicylic acid (starting material or reactant) in the crude aspirin product, the ferric chloride test is used.FeCl3(aq) solution is used to check and test the purity of the crude aspirin.

When FeCl3 solution (2 drops of FeCl3 neutral solution in 1 mL of ethanol) is added to the solution of product formed, the salicylic acid gives purple color, while the crude aspirin product and the final purified aspirin, both gives yellow color.

This is because Fe³ ion reacts with phenols (i.e. salicylic acid) to form a purple complex. Salicylic acid contains a phenol group, whereas, acetylsalicylic acid (Aspirin) does not. Thus, after the addition of FeCl3 to the crude aspirin solution, if a purple color is observed, it means that there is still some salicylic acid present unreacted and the obtained product is impure.

If only, the yellow color is observed upon addition of ferric chloride, that means there is no unreacted starting material present in the product. A minor amount may be present in the crude aspirin product, which is not in enough concentration to form a complex with the ferric chloride to generate the purple color.

After that, when the purple color does not observe, then the product only contain crude aspirin, which can be purified by recrystallization.

For this, the crude aspirin is dissolved in a small amount of warm ethanol with a known quantity of water is added and the resultant solution is allowed to cooled slowly and then chilled.

The acetylsalicylic acid will recrystallize and the solid impurities (like unreacted salicylic acid) will remain dissolved in the solution.

The crystallised solid aspirin is collected through filtration and again tested for FeCl3 purity test, which should give yellow color with iron and it should be purer than the original aspirin.

The ferric chloride purification test of aspirin crude product suggest or prove that if an unreacted starting material is there or not. If purple color is found then starting material should be removed by suitable other purification methods like crystallisation.

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Answer:

Explanation:

1. It is an element since it has only one type of atom

2. It is a compound because 2 types of atoms are chemically bound

3. It is a mixture because it has 2 types of atoms which aren't bound

Answer:

First picture: Element

Second picture: Compound

Third picture: Mixture

Explanation:

First picture:

It represents an element as all the atoms are the same.

Second picture:

The other type of atoms are shown as chemically bonded to the green atoms — in the diagram the green atoms and pink atoms are touching.

Third picture:

It is representing a mixture as the other atoms are not chemically bonded together with the green atoms — the green and orange atoms are seperate and are just mixed

In most crystalline metals, plastic deformations caused by loads greater than the yield stress are the result of dislocation motion.

The dislocation motion plays the important role in the plastic deformation. The plastic deformation occurs when a material will be stress. The resulting plastic deformation is the permanent change. this permanent change is cannot be recovered by the removing the the stress that caused the deformation. the plastic deformation caused by the dislocation motion. dislocation motion, atoms in metals to side readily.

Thus, the plastic deformations is caused by the dislocation motion. this plastic deformation is the permanent change and not be removed by the simply removing the stress.

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Answer:a

Explanation:

look it up

Answer:

The punching bag exerts a force of 1300 Newtons on the boxer.

Explanation:

The punching bag exerts 1300 Newtons on the boxer because Newton's third law says that "every action has an equal and opposite reaction" which means that for example, as the boxer punches the punching bag, the boxer exerts a force of 1300 Newtons to the right. The punching bag at the same time exerts a force of 1300 Newtons to the left against the boxer. So "every action" would be the boxer pushing on (punching) the bag and the bag moving (for example) to the right, away from the boxer, "equal and opposite reaction" would be the punching bag pushing against the boxer (during contact) and moving to the left, which is cause for the back and forth movement of the bag after contact with the boxer.

(Sorry for the long-winded explanation, hope this helps!)

an electronic interaction that stabilizes alkenes and carbocations and results from overlap of a vacant p orbital on one atom with the neighboring c-h sigma bond is known as Hyperconjugation.

The delocalization of the sigma electrons in the C-H bond of an alkyl group coupled to an atom in an unsaturated system or to an atom with an unshared p orbital is known as hyperconjugation, which is a general stabilizing interaction. When a suitable attacking reagent is present in an organic molecule, electron displacement happens.

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The rate constant for weak acid and base for the dissociation is low, they do not easily dissociate in water. Therefore, option 1 is the correct option.

Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base releases hydroxide ion OH⁻ ion when dissolved in water.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. Strength of acidic nature is directly proportional to the concentration of hydronium ion.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. Temperature affect the pH. At room temperature pH scale is between 0 to 14. 7 is the pH of neutral solution. A solution of the ionic salt NaF is basic in nature. The acid in the give equation is H₂Se as it is giving hydronium ion.

Therefore, option 1 is the correct option.

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The products formed during the single displacement reaction between Al₂S₃ and Li are Li₂S₃ and Al.

What are deplacement reactions?

When a more reactive element pushes a less reactive element out of a compound that also contains the less reactive element, a displacement reaction takes place. The less reactive element has undergone a displacement reaction and is now pure and unmixed.

In the reaction of  Al₂S₃ and Li the following is observed:

Li+ Al₂S₃  = Li₂S₃ +Al

Lithium displaces aluminium here.

Hence the products formed during the single displacement reaction between Al₂S₃ and Li are Li₂S₃ and Al.

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Aluminum is a metal whose temperature rises by 52.0 °C in a 100 g sample after absorbing 4680 J of heat.

What is specific heat capacity?

The amount of heat per unit mass needed to raise the temperature by one degree Celsius is known as the heat capacity or specific heat. The ability to distinguish between two polymeric composites using specific heat is useful in calculating processing temperatures and the quantity of heat required for processing.

We have a mass (m) of 100 g of an unidentified metal whose temperature (T) rises by 52.0°C after absorbing 4680 J of heat (Q). The amount of heat needed to raise the temperature of the unit mass by the unit of temperature is known as the specific heat capacity (c) of the metal.

The metal with the highest specific heat capacity is aluminum (0.900 J/g°C).

Aluminum is a metal whose temperature rises by 52.0 °C in a 100 g sample after absorbing 4680 J of heat.

Hence, Aluminum is the metal

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option A.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

Composite materials are made from Concrete and steel. A composite material is made up of two or more constituent materials whose properties are very dissimilar from each other.

Therefore, the correct option is option A.

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The energy of the wave of frequency 3.78×10¹⁰ Hz is 2.5×10⁻²³ J.

Energy is the ability or the capacity to perform work.

To calculate the energy of the wave, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the energy of the wave is 2.5×10⁻²³ J.

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The change of enthalpy for the given reaction is equal to -6387 KJ.

Enthalpy can be defined as the sum of internal energy and the product of volume and Pressure, expressed as shown below:

H = U + PV

The change in enthalpy between the beginning and final states can be expressed as:

ΔH = ΔU + ΔPV

Given reactions with enthalpy change are shown below:

2Al (s) + 6HCl (aq) → 2AlCl₃ (aq) + 3H₂ (g)      }×1        ΔH₁ = -1049 kJ

HCl (g) → HCl (aq)                                            } ×6       ΔH₂ = -74.8 kJ/mol

H₂ (g) + Cl₂ (g) → 2HCl (g)                                }× 3      ΔH₃ = -1845. kJ/mol

AlCl₃ (aq)  → AlCl₃ (s)                                      }× 2         ΔH₄ = +323. kJ/mol

[tex]\triangle H^o_f =1\times \triangle H_1 +6\times \triangle H_2+3\times \triangle H_3+2\times \triangle H_4[/tex]

[tex]\triangle H^o_f =1\times (-1049) +6\times (-74.8)+3\times (-1845)+2\times (+323)[/tex]

[tex]\triangle H^o_f =-6387 KJ[/tex]

Therefore, the change of enthalpy for the reaction of the formation of aluminum chloride is -6387 KJ.

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Molarity of 125g cobalt chloride dissolved in a final volume of 300ml is 1.75M.

What is molarity?

Molarity is a unit of concentration for a solution, which is the number of moles of a solute per liter of solution. It is denoted by the symbol “M” and is an important concept in chemistry. Molarity is used to quantify the amount of a solute that is present in a solution and can be used to calculate the volume of a solution required to make a solution with a certain molar concentration. Molarity is a key parameter in determining the properties of a solution and is used to solve for the mass or volume of a solute needed to make a solution.

M= no. of moles of solute /volume of solution (in L)

Volume of solution = 300/1000 =0.3 L

Moles of cobalt chloride = 125/237.9 moles

M= 125/ (237.9×0.3) = 1.75 mol L⁻¹ = 1.75M

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Alpha Centauri  would he be able to reach first.

What is Alpha Centauri  ?

At a distance of 4.37 light years, the star system known as Alpha Centauri is thought to be the one that is nearest to our solar system. Alpha Centauri A, Alpha Centauri B, and Alpha Centauri C, often known as Proxima Centauri, are the three stars that make up the stellar system.

The first mention of this star system dates back to 1592, when an explorer named Robert Hues brought it to light through his research. The binary character of the system wasn't understood until 1689. This star system has been the subject of extensive recent research, and studies conducted over the previous ten years have uncovered a number of interesting facts about Alpha Centauri.

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The question about plants can be answered scientifically by classifying is What kinds of animals like to eat dandelion plants? Therefore, option C is correct.

Many songbirds consume dandelion seeds, including chipping, field, house, song, and white-throated sparrows, American goldfinches, and indigo buntings. Bobwhite quail, wild turkeys, ruffed grouse, rabbits, white-tailed deer, and eastern chipmunks all consume dandelions.

They are one of the first food sources for bees, butterflies, moths, flies, beetles, and other insects because they bloom early in the spring. Dandelion seeds are eaten by finches and sparrows.

Thus, option C is correct.

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The time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h is 4.8 hours

We know that speed is defined as the distance travelled per time as shown below:

Speed = Distance / time

With the above formula, we can determine the time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h. Details below:

Speed = Distance / time

5.6 = 25 / time

Cross multiply

5.6 × time = 25

Divide both sides by 5.2

Time = 25 / 5.2

Time = 4.8 hours

This, the time taken is 4.8 hours

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7.35 KJ energy is gives off when 1.00 g Fe is reacted with excess oxygen according to the reaction.

The reaction between Fe and O is as below :

4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(g)

here , Δ H =  - 1652 KJ

The enthalpy change is -1658 KJ. It means the reaction gives off 1652 heat or energy.

Heat released when 1.00g of is reacted with excessive oxygen:

Moles of Iron (Fe) = [tex]\frac{1g}{56g/mol}[/tex] = 0.0178 mol

According to reaction, When 4 moles of an Iron (Fe) reacts with 3 moles of Oxygen (O) it gives 1652 Kilo Joules of Energy.

Then 0.0178 Moles of Iron (Fe) will give :

∴ [tex]\frac{1652 KJ}{4}[/tex] × 0.0178 = 7.35 KJ

So, 1.00 g of Fe reacts with an excess of oxygen to release 7.35 KJ of energy.

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the answer is d

i looked this up i was confused myself but its d or e

A plate slides beneath another plate due to convection currents and gravity. Hence option 2 is correct.

Subduction is defined as a process through which, at convergent borders, the oceanic lithosphere is recycled into the Earth's mantle. Subduction happens when one plate is driven beneath the other and back into the Earth's interior when two plates collide at a convergent boundary.

An object is drawn into the mantle by convection currents. Due to gravitational attraction, one plate slides under another. When an oceanic plate collides with a continental plate and slides beneath it, subduction occurs. When two oceanic plates or a plate bearing continents contact, one plate will bend and slide under the other.

Thus, a plate slides beneath another plate due to convection currents and gravity. Hence option 2 is correct.

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Answer: b. A plate slides beneath another plate due to convection currents and gravity. 

Explanation:

Answer:The ionic formula for Lithium Oxide is

L

i

2

O

.

Lithium is an Alkali Metal in the first column of the periodic table. This means that lithium has 1 valence electron it readily gives away in order to seek the stability of the octet. This makes lithium a

L

i

+

1

cation.?

Explanation:

Answer: O 2 2−

Explanation: I just ripped this

Carbon is covalently bound to four iodine atoms in [tex]CI_{4}[/tex], also known as carbon tetraiodide, which is [tex]sp^{3}[/tex] hybridized.

Its form is tetrahedral, and its bond angles are 109.5°. It is vivid red in color and easily breaks down into tetraiodoethylene [tex]C_{2}I_{4}[/tex].

Of the nonmetals we mix with halogens, carbon has perhaps proven to be the most challenging. The electronegativity of carbon is 2.5, which puts it on par with iodine and just somewhat behind fluorine, chlorine, or bromine. Thus, carbon may share some of its electrons in a covalent connection with halogens.

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The IUPAC name for C2H5 is ethyl radical.

Ethyl is a Radical formed from Ethane. Ethane is a chemical compound, which is a colorless and odorless gas. It is a non-polar dispersion force.

Ethyl is also known as ethyl alcohol or ethanol. It is a flammable liquid that is toxic. It is used by medical practitioners, mainly in hand sanitizers.

Ethyl is an organic hydrocarbon molecule. IUPAC is an international federation that represents chemistry and its related tools and techniques. It is a part of the International Science Council, and helps in designing various chemical structures, names  and standards.

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The survival level of C02 for humans in space is 0.01 to 0.02% and within the level will have minor symptoms.

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The mechanistic intermediate that is used to explain the preference for addition of the Br atom , of Hbr, to the internal carbon of a terminal alkyne is free-radical conditions.

The addition of HBr to an alkyne under free-radical conditions is governed by the addition of a Br atom to the alkyne which helps in giving the most stable alkyl radical possible. The addition of HBr in the absence of radicals is governed by the addition of a proton to the double bond which helps in giving the most stable carbocation possible.

A molecule wherein a carbon atom has a fine fee and three bonds is known as a carbocation. We can basically say that they are carbon cations. Later, it forms into carbonium ion. Any even-electron cation that possesses a big effective charge at the carbon atom is known as an carbocation.

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N2  < F2 <  Cl2 < 02 By Terms Of Increasing Average Molecular Speed At 25°C, according to the stated formula.

Molecules were inorganic entities that are composed of different molecules. Examples include typical substances like water (H2O) and carbon dioxide (CO2).

Two or even more atoms make up molecules. They may have the same atoms (for example, an oxygen molecule contains two oxygen atoms) or different atoms if they have more than one (a water molecule has two hydrogen atoms and one oxygen atom). Biological molecules like DNA and proteins can include thousands of atoms.

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These technology would changes in near future

Artificial Intelligence

Gene Technology

Human-Computer Interfaces

What is Artificial Intelligence Technology?

The definition of artificial intelligence is the theory and development of computer programs that are able to do tasks and solve problems that usually require human intelligence

You've probably read or heard of the ubiquitous buzzword known as artificial intelligence, or AI. When you think about AI, articles about technology, the digital age, and robotics might come to mind. But what exactly is it, and how is it put to use?

Programming technology to solve problems is a technological advancement known as artificial intelligence

In-depth explanations of artificial intelligence's definition, applications, and future prospects are provided in this manual.

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Answer:

Element Arsenic

Explanation: