A piece of solid ni metal is put into an aqueous solution of znso4. write the net ionic equation for any single-replacement redox reaction that may be predicted. (use the solubility rules provided in the owl preparation page to determine the solubility of compounds.)

Because the student stopped adding ice when the water cooled down to 15°C, the final calculated value of AH would be different. This is because the heat of fusion of water is not a constant, but rather it decreases as the temperature decreases. Thus, the heat of fusion would be less at 15°C than it would be at 0°C.

What is temperature?
Temperature is a numerical expression of how hot a substance or radiation is.
There are three different types of temperature scales: those that are defined by the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body, like the SI scale; those that rely only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are not defined by theoretical principles but rather by useful empirical properties of particulate matter.

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In an acid-base neutralization titration, where the end point is a neutral solution, the unknown concentration of the receiving solution can be calculated because the concentration of he acid solution must match the concentration of the basic solution

Neutralization is a chemical reaction where an acid and a base react with each other in equimolar amount and acid base neutralization titration is based on acid base in quantitatively measurement and that's why it is called as acid base neutralization titration

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I was asking about this earlier

Answer:

In chemistry and atomic physics, the main group is the group of elements whose lightest members are represented by helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, and fluorine as arranged in the periodic table of the elements. The main group includes the elements in groups 1 and 2, and groups 13 to 18.

Answer:

it's c

Explanation:

I got a 100 on test5tttttttttttttttt

If the initial pressure of (CH3)20, is 135 torr, the final pressure after 1420s is 51.4torr .the half life is 1019s.

We know ,

For the 1st order reaction we have the reaction in terms of pressure is

Pₓ = P₀ e⁻kt

lnPₓ = lnP₀ - kt

kt = lnP₀ -lnPₓ  = 2.303log P₀/Pₓ

t = (2.303/k) logP₀/Pₓ

Where ,

k = rate constant = 6.8×10⁻4 s⁻1

P₀ = initial pressure = 135torr

Pₓ= final pressure

t = time taken = 1420s

putting the values in the places of the symbol ,

1420 =( 2.303 / 6.8 ×10⁻4 ) log 135/Pₓ

1420 = (2.303×10^4/6.8 ) ×log 135/Pₓ

(1420×6.8 / 2.303×10^4) = log 135/Pₓ

0.41928 = log 135/Pₓ

135/Pₓ = 10^0.41928 = 2.6259

Pₓ = 135/2.6259 = 51.4 torr

Hence , the final pressure after 1420s is 51.4torr .

b) the half life formula is given by ,

T1/2 = 0.693/k = 0.693 / 6.8×10⁻4 = 0.1019×10^4 =1019s

Hence , the half life is 1019s .

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The scientific explanation about conduction is; heat transfer by conduction is the process by which heat flows from region of higher temperature to another region of lower temperature without the bulk movement of the particles of the substance.

Conduction heat transfer is the transfer of heat by means of molecular excitement within a material without bulk motion of the mater.

Heat transfer by conduction allows heat to be transferred from a region of higher temperature, to another region of lower temperature without the bulk or entire movement of the particles of the substance.

Thus, we can conclude that conduction, a method of heat transfer occurs as a result of temperature difference between two bodies.

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The crystallization makes the protein active. The diffractive pattern observed during X-ray exposure to the crystal can be used to calculate the electron density map of the crystalline protein. this makes option D correct.

Proteins are complex amino acids. They are long chain or structure made up of amino acids. Proteins are of different types, globular protein which are soluble and fiber like protein which are insoluble. Hair, skin,muscles are fiber like proteins. Egg albumin and egg white are gobular proteins. Protein may vary from structure to structure. Some are primary structured, some are secondary, some are tertiary or some are Tetranary. 

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The mass, in grams, of 2.50 mol of iron(iii) hydroxide is 225g

Mass is the measure of amount of matter in a substance or in a object

Here given data is mass iron(iii) hydroxide in mole =  2.50 mol and we have to find mass in gram = ?

The mass of one mole of Fe(OH)₂ = 89.85g/mol

So multiply by given mole by molar mass

2.50mol Fe(OH)₂ = 89.85g/mol Fe(OH)₂/1 mol Fe(OH)₂ = 225g Fe(OH)₂

mass, in grams, of 2.50 mol of iron(iii) hydroxide is 225g

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The equation of the precipitation reaction is given below:

Precipitation reactions are reactions in which two solutions are mixed together to give a product that is insoluble in an aqueous medium known as a precipitate.

The precipitate obtained can be removed from the mixture through filtration using filter paper.

Precipitation reactions can either be a single displacement or double displacement reaction.

The equation of the reaction of the formation of the precipitate is Ba₃(PO₄)₂ is given below:

Barium iodide, BaI₂ reacts with sodium tetraoxophosphate (v), Na₃PO₄.

BaI₂ (aq) + Na₃PO₄ (aq) ---> Ba₃(PO₄)₂ (s) + 3 NaI (aq)

Therefore, the formation of  a white precipitate shows that barium tetraoxophosphate (v) Ba₃(PO₄)₂ is insoluble in water.

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The ksp of caf2 if its molar solubility is 2.04 x 10-4 m is 3.40 x 10⁻¹¹.

Solubility is described because the maximum quantity of a substance with the purpose to dissolve in a given quantity of solvent at a distinct temperature. Solubility is a function property of a selected solute-solvent combination, and exclusive substances have greatly differing solubilities.

calculation:-

Caf₂ ----> Ca²⁺   + 2f⁻

                  s          2s

Ksp = [Ca²⁺] [f⁻]

ksp = [s][2s]²

      = 4s³

Given

S = 2.04 x 10⁻⁴

⇒ Ksp = 4( 2.04 x 10⁻⁴)²

⇒ Ksp = 4 ( 8.49 x 10⁻¹²

⇒ Ksp = 3.40 x 10⁻¹¹

Solubility is the capability of a substance, the solute, to form an answer with some other substance, the solvent. Insolubility is the other belonging, the inability of the solute to shape this kind of solution.

Solubility refers to the best quantity of solute that may dissolve in a regarded amount of solvent at a given temperature. In a solvent, an answer is a homogeneous aggregate of one or greater solutes.

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From the information given, the amount of milk that an adult would need to drink in order to get their RDA for calcium is 826.45cm³. While the amount of milk they would need to drink to get their RDA for B-12 is 266.67. See the explanation below.

Recommended Dietary Allowances (RDAs) are nutrient consumption levels determined by the Food and Nutrition Board to be adequate to fulfill the known nutritional needs of nearly all healthy people based on scientific evidence.

The calculation that justifies the above is given as follows:


For calcium, the RDA is derived as follows;

(500/605) * 1000

= 826.446280992

[tex]\approx[/tex] 826.45cm³

For Vitamin B-12, the RDA is derived as follows;

(500/4.5) x 2.4

= 266.666666667

[tex]\approx[/tex] 266.67cm³

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Full Question:

See attached image.

For a neutralization reaction, more heat is evolved and Q is doubled.

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The equation for cellular respiration is :

Glucose + oxygen ⇒ water + energy + carbon dioxide

HOW CELLULAR RESPIRATION WORKS:

The process through which living things receive the energy (ATP) required for metabolic activity is called cellular respiration.

It entails the breakdown of sugar molecules (with or without oxygen) to release carbon dioxide and produce energy in the form of ATP (CO2).

The reactants of cellular respiration, or the substances that are used for the beginning of the chemical process, are sugar (glucose) and oxygen. The products, or the results of cellular respiration, are water, carbon dioxide, and ATP energy. Thus it is the answer.

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Answer:

81.8 grams of Al is required

The molar heat of solution is  -23.2 kJ/mol.

The molar heat is the heat that is evolved when one mole of the rubidium bromide is dissolved in water under standard conditions. We first have to find number of moles of the solution. When we dissolve the solid in solution heat is absorbed or evolved as seen above.

Number of moles =  7.00 g/165 g/mol = 0.04 moles

Given that;

H = cθ

H = heat absorbed or evolved

θ = temperature change

c = heat capacity

H = -(2.65 *  0.350)/0.04

H = -23.2 kJ/mol

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1) When the powdered sulfur are placed together in a metal beaker, the both are examples of pure substances

2) When the both substances are heated such that magnesium sulfide is formed, it is no more a mixture but a compound.

The term mixture has to do with a combination of two or more substances that are not chemically combined together. Let us note that a mixture would always retain the properties of the individual substances that do make up the mixture as it were.

When the components of a mixture react chemically then it is no more a mixture because a chemicals bond now exists between the substances and they can no more be separated by means of a physical method.

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The mass of potassium chloride, KCl needed to make the solution is 148 g

We'll begin by obtaining the mole of KCl. This can be obtained as follow:

Molarity = mole / volume

Cross multiply

Mole = Molarity x Volume

Mole of KCl = 4 × 0.5

Mole of KCl = 2 moles

Finally, we shall determine the mass of KCl

Mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of KCl = 2 × 74

Mass of KCl = 148 g

Thus, the mass of KCl is 148 g148 g

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The boiling point of nitrogen is so low because the nitrogen molecules are very small. The small size of the molecules means that they can escape the liquid state very easily.

What is nitrogen?
The chemical element with the atomic number 7 and the letter N is known as nitrogen. The lightest element in group 15 of the periodic table, often known as the pnictogens, nitrogen is a nonmetal. It is a typical element in the cosmos, believed to be eighth in the Milky Way and the Solar System in terms of overall abundance. Two of the element's atoms combine to generate N₂, an odourless and colourless diatomic gas, under standard pressure and temperature. The majority of the atmosphere on Earth is made up of N₂, making it the most prevalent uncombined element. All living things contain nitrogen, which is principally found in the amino acids that make up proteins, the nucleic acids that make up DNA and RNA, and the energy-transfer molecule adenosine triphosphate.

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Answer:

Explanation:

It is the lighter outer part of a shadow, and it is a factor that causes partial solar eclipses, penumbral lunar eclipses, and partial lunar eclipses. You can consider it a shadow within a shadow

When we observe the spectral lines for a variety of different elements within an atom we see that transition of electrons causes it to emit light in specific spectral lines in a spectrum.

What is transition of electrons?

In an atom, the jump of an electron from one energy phase to another energy phase is called transition of electrons.

Typically, an electron continue to change its quantized energy levels from one to another within few nanoseconds by absorbing UV radiations and that is why the spectrum or spectral lines appear to be discontinuous.

In general, transition of electrons mostly occurs in s, p and n energy orbitals.

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Answer: Heterogeneous mixture (suspension)

Explanation: There is a pattern of the items making them different which is heterogeneous.

One part of the earth system water-air, rock or life and describe how other parts might be effected if the first part were removed then the biosphere which contain all planet living organism and in the atmosphere  which contain all planet air

Earth system is the earth interacting with physical, chemical as well as biological and the sphere are so closely connected that a change in one sphere often result in change one or more of other sphere and events that occur in one component eventually affect the other and the components are geosphere is the ability to live in certain places whereas hydrosphere is the ability to use water whereas atmosphere impacting the temperature and ability to breath and also the water-air, rock in that one is missing so it will definitely affect the other

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The density of the resultant mixture is 0.925 g/cm³.

The mass of each component of the mixture is calculated as follows;

m = ρV

where;

mass of water = 20 cm³  x  1 g/cm³ = 20 g

mass of ethanol = 20 cm³  x 0.789 g/cm³ = 15.78 g

Total mass of the mixture = 20 g + 15.78 g = 35.78 g

The density of the mixture is calculated as follows;

Density of the mixture = total mass / total volume

Density of the mixture = (35.78 g) / (38.7 cm³) = 0.925 g/cm³

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The signs which are typically posted in areas of active lab work are safety equipment signs, Chemical storage signs, Signs prohibiting food and drink, and Personal protective equipment (PPE) signs.

Typically, active lab work is an area or lab where different samples of tissues, blood, urine, and other fluids are tested for diagnosis purposes and also for research.

A standard lab establishes some PPE signs and rules which must be followed by all the workers, patients, and staff.

In every laboratory, there are some general rules regarding the use of hazardous materials and equipment and for this purpose, safety signs are placed for precaution. Food and drinks are also prohibited in the lab as they may get contaminated.

These rules are being acquainted with the equipment and operation methods, not working alone in the lab, and wearing gloves and goggles, lab coats, and safety shoes for personal safety.

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A 99.0 ml sample of 1.00 m NaOH is mixed with 49.5 ml of 1.00 m H₂SO₄ in a large styrofoam coffee cup; the cup is fitted with a lid through which passes a calibrated thermometer. The temperature of each solution before mixing is 23.00 °c. after adding the NaOH solution to the coffee cup and stirring the mixed solutions with the thermometer, the maximum temperature measured is 31.50 °c. Assuming that the density of the mixed solutions is 1.00 g/ml, that the specific heat of the mixed solutions is 4.18 j/(g·°c), and that no heat is lost to the surroundings, the enthalpy of reaction is found to be 10.6 x 10⁻² kJ/mol.

The enthalpy change of the reaction can be calculated by using the mass of solution, temperature change, and specific heat of water when sodium hydroxide and sulfuric acid reacts.

The balanced chemical equation for the reaction is given as,

H₂SO₄(aq) + 2 NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l)

We know that,

volume of solution is 49.5 mL + 99.0 mL = 148.5 mL

Heat of the reaction can be given as - q = mcΔT

Mass of the solution, m = 148.5 x 1 g   = 148.5 g

                                                       1 mL

Specific heat, c = 4.18 J /g°C

Temperature change, ΔT = 31.50°C - 23.00°C = 8.5°C

Substituting values in equation,

q = 148.5 g x 4.18 J/g°C x 8.5°C = 5276.20 J

Now we will find moles,

Moles of NaOH = 0.99 mL x 1.00 M = 0.99 mol naOH

Moles of H₂SO₄ = 49.5 mL x 1.00 M = 49.5 mol H₂SO₄

Enthalpy of the reaction will be -

Enthalpy = 5276.20 J = 10.6 x 10⁻² kJ/mol

                   49.5 mol

Hence, the enthalpy is 10.6 x 10⁻² kJ/mol

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The chocolate chips that are in one mole of chocolate chips is 6.02214 × 10²³ chips.

The mole of a substance is defined as the amount of substance that is my are up of 6.02214 × 10²³ particles and this number is called the Avogadro's number.

This means that 1 mole of substance= 6.02214 × 10²³ of particles that makes up the substance.

The Avogadro's number is a constant used for all substances such as the chocolate chips.

That is to say, one mole of the chocolate chips has a mass of 0.324 g but contains 6.02214 × 10²³ particles of chocolate chips.

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The number of chocolate chips that are included inside one mole of chocolate chips is equal to 6.02214 ×10^23 chips.

The quantity of a material that may be made up of 6.02214 ×10^23 particles is referred to as a mole, and this number is known as Avogadro's number. The mole is the unit of measure used to describe this quantity.

This indicates that there are 6,02214×10^23 particles in one mole of the material, which implies that one mole of the substance is equal to one mole.

Avogadro's number is a constant that is applied to many different kinds of things, including chocolate chips.

In other words, one mole of chocolate chips has a mass of 0.324 g, yet it includes 6.02214 ×10^23 individual chocolate chip particles.

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