which one is correct?

40.4 C

So far q(rxn) = q(water) + q(CaCl2) (136g)(4.184J/°Cg)(Tfinal - 25.0°C) = (125g)(4.184)(Tfinal - 25.0°c) + (11g)c(Tfinal - 25.0°C).

The specific heat capacity is measured in J/(kg K) or J/(kg °C), and it is the amount of heat (J) absorbed per unit mass (kg) of the material when its temperature rises by 1 K (or 1 °C).The average kinetic energy of the atoms or molecules in the system is measured by temperatures. The zeroth law of thermodynamics states that when two objects are in thermal equilibrium, no heat is transferred between them, resulting in an equalisation of their temperatures.

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The molar mass of the other gas is 153.79 g/mol

Step 1: The Data given,

It required 57 s for 1.0 L of the gas to effuse.

Under identical experimental conditions it required 26 s for 1.0 L of O2 gas to effuse.

Step 2: Calculate the molar mass

Graham's law of effusion says:

r1/r2 = √(M2/M1)

⇒ with r1 = effusion rate 1 = L/57s

⇒ with r2 = effusion rate 2 = L/26s

⇒ with M1 = molar mass of the gas = x g/mol

⇒ with M2 = molar mass of oxygen = 32 g/mol

We should be careful if we plug in the effusion rate. Because the fractions could flip if we don't give the effusion rates as numeral values.

(L/57s)/(L/26s) = 26/57 = √(32/M1)

26/57 =√(32/X)

(26/57) ² = 32/X

0.208064 =32/X

X = 32/0.208064

X = 153.79 g/mol

Hence, The molar mass of the other gas is 153.79 g/mol

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The ocean's salinity is raised by both sea ice production and ocean water evaporation. Ongoing inflow of fresh water from the rivers, fall of rain and snow, and the melting of ice constantly balance.

It makes a significant contribution to conductance and influences many elements of the biochemistry in groundwaters as well as the biological activities that take place there. Temperature, pressure, and salinity all influence the physical properties of water, including its density its heat capacity.

Seawater salinity is impacted by rains, ice development, melting, and drainage. Seawater evaporate, leaving behind salts, which enhances their concentration and raises the salt of the water.

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Answer: B Is the answer

Explanation:  I just did this

Magnesium would be chosen to produce the hydrogen gas .

What is Chemical reaction ?

There are chemical reactions taking place all around us. Nothing could be further from the reality, despite the fact that we occasionally link chemical processes with the sterile surroundings of the test tube and the lab. A staggering, nearly incomprehensible variety of new substances and energy changes actually result from the enormous number of alterations that occur in our environment every second of every day.

Chemical reactions happen whether or not you want them to in nature, where they can be considerably less controlled than in a lab. They can also be more messier. Whether it be a forest fire that is blazing.

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By finding the serial fraction, we arrive to the aforementioned Karp-Flatt metric.

A measure of code parallelization in systems with parallel processors is the Karp-Flatt metric. This metric exists in addition to Amdahl's law and Gustafson's law as a measure of the level of parallelization of a specific computer code. In 1990, Horace P. Flatt and Alan H. Karp made the suggestion.

The effectiveness of a parallel algorithm operating on a parallel processor can be evaluated in a variety of ways. The Karp-Flatt metric identifies a statistic that highlights performance characteristics that are difficult to identify from other metrics. Amdahl's Law has the following pseudo-"derivation," .

Note that the left hand side reflects a metric quantity rather than a quantity that was derived mathematically, indicating that this is not a "derivation" from Amdahl's law. The analysis above only demonstrates that the Karp-Flatt measure and Amdahl's Law are compatible.

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The density of the solid substance if a cube  measuring 2.02cm on one side having a mass of 101g is  12.254g/cm^3.

What is meant by density?

Density can be defined as the relationship between mass of a substance and volume of that substance. Density explains how tightly the atoms in a substance is packed together.

Density of the substance can be calculated by dividing mass by volume of the substance.

Volume of the cube = LxBxH = 2.02cm x 2.02cm x 2.02cm = 8.242 cm^3

Density = mass/volume = 101g/8.242cm^3 = 12.254 g/cm^3

Therefore, the density of the solid substance if a cube  measuring 2.02cm on one side having a mass of 101g is  12.254g/cm^3.

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The given equation is showing the law of conservation of mass as the number of hydrogen and oxygen atoms are same on the both sides of the equation.

A chemical equation can be described as the representation of a  reaction in terms of chemical symbols of the substances. A chemical equation possesses of participating reactants in the reaction, formed products, and an arrow representing the direction of the chemical reaction.

The chemical equation in which the number of atoms of each element is equal on either side of the equation is called a balanced chemical equation.

The law of conservation of mass obeys by every balanced chemical equation. By following law of conservation, the total mass of the chemical elements  on the reactant side should be equal to the total mass of chemical elements on the product side in a balanced chemical equation.

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The primary difference between the oxidation of glucose to CO₂ by glycolysis and the critic acid cycle vs by the pentose phosphate is the glycolysis occurs in cytosol. to CO₂ is release of CO₂ is in mitochondria and in the pentose phosphate CO₂ is generated in the cytosol.

When the glucose oxidation takes place  by glycolysis and the citric acid cycle , the total catabolism will occur. The energy is released and this energy is trapped in ATP. in this glucose is catabolizes. in pentose phosphate  CO₂   is generated in the cytosol.

Thus, The primary difference between the oxidation of glucose to CO₂ by glycolysis and the critic acid cycle vs by the pentose phosphate is the glycolysis occurs in cytosol. to CO₂ is release of CO₂ is in mitochondria and in the pentose phosphate CO₂ is generated in the cytosol.

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The given question is incomplete and the complete question is

When 2 moles of Fe(s) react with Cl2(g) to form FeCl3(s) according to the following equation, 799 kJ of energy are evolved.  Is this reaction endothermic or exothermic and What is the value of q

When 2 moles of Fe(s) react with Cl2(g) to form FeCl3(s) according to the following equation, 799 kJ of energy are evolved then the reaction is exothermic reaction and the value of q is -1598 kJ

Mole is the amount of substances of a specified elementary entity

2 moles of Fe(s) react with Cl2(g) to form FeCl3(s)

Energy = 799 kJ

We have to calculated reaction endothermic or exothermic = ?

The value of q = ?

So according to the reaction 799 kJ of energy are evolved it means that the enthalpy is negative as the reactant have more energy than the product and which means this is an exothermic reaction

And here we know that enthalpy of reaction is -799kJ/mol and considering the reacted 2 mole of solid iron then

q = 2 mol×-799kJ/mol

q = -1598 kJ

-1598 kJ energy are evolved when 2 mole of solid iron is react

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The safety factor describes how much more robust a system is than is necessary for the load that is intended.

The shape, dimensions, and holes of a metal support bracket determine its strength. Static loading, bracket material Designing a metal support bracket that is strong depends on the metal's thickness and profile. Thus, strength is determined by shape, size, and holes. The bracket's material not only determines its strength, but it also has the ability to withstand rusting. Static loading examines the amount of load the bracket can support before deflection to evaluate the strength. utilising the safety factor .

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You can find the mass and volume of the pure metal then compare the density with the table of densities to determine which metal.

Density is a term used to describe how tightly a substance is packed. It fits that criteria of mass per unit volume. Formula for Density or Density Symbol: D The formula is: = m/V where is the object's mass, m is its density, and V is its volume. The term "mass" is used to describe how much matter there is in a thing. Mass is often represented in kilogrammes (kg) or grammes (g) (kg). The most common units of mass measurement are kilogrammes (kg) and grammes (g). No matter where in the cosmos it is or how much gravitational force is exerted on it, mass is a measure of how much matter there is.

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K+ has the greatest nuclear charge (Z = 19), its radius is smallest, and S2− with Z = 16 has the largest radius.

What is atomic radius ?

Atomic radius is generally given as the total distance from the nucleus to the outermost orbital of an electron. Simply put, it can be defined as analogous to the radius of a circle, where the center of the circle is the nucleus and the outer edge of the circle is the outermost orbit of the electrons. As you begin to move or move down the periodic table, trends emerge that help explain how atomic radii change.

The net nuclear charge (Zeff) of an atom is the net positive charge experienced by the valence electrons. Not all of the positive charge is seen by valence electrons, as some of the positive charge is masked by core electrons. A detailed explanation of shields and effective nuclear charges can be found here. Zeff greatly influences the atomic size of an atom. So a decrease in Zeff results in an increase in atomic radius. This is because the electrons are more shielded from the nucleus and the attractive force between the nucleus and electrons is reduced. Zeff decreases from right to left down the periodic table down the group, so the atomic radius increases as the group moves down the periodic table from right to left.

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The pressure, in atm, if the sample of helium is compressed to 125 ml is 2.32 atm

An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.

Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.

Using the ideal gas equation:-

At constant temperature

Given;

P₁ = 0.9 atm

V₁ = 322 ml = 0.322 L

P₂ = ?

V₂ = 125 ml = 0.125 L

P₁V₁ =P₂V₂

P₂ = P₁V₁ /V₂

    = 0.9 × 0.322 /0.125

    = 2.32 atm

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I would expect the dissolved oxygen levels from wаter entering а lаke to hаve lower thаn the lаke itself becаuse the steаm is аble to hаve wаrm wаter which cаn cаuse the lаke temperаture to be wаrm аlso. Hаving wаrm wаter meаns hаving less dissolved oxygen.

Dissolved oxygen (DO) is the аmount of oxygen thаt is present in wаter. Wаter bodies receive oxygen from the аtmosphere аnd from аquаtic plаnts. Running wаter, such аs thаt of а swift moving streаm, dissolves more oxygen thаn the still wаter of а pond or lаke. Heаlthy wаter should generаlly hаve dissolved oxygen concentrаtions аbove 6.5-8 mg/L аnd dissolved oxygen sаturаtion between аbout 80-120%.

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Answer:

Bile

Explanation:

Bile is secreted by the liver to help in the breaking down of food particles.​

Answer:

Explanation:

Numerous, controlled studies have demonstrated that people who exercise regularly have greater bone density than those who are more sedentary.

Any type of exercise will stimulate the deposition of more bone tissue, but resistance training has a greater effect than cardiovascular activities.

Hope this helps

Answer: The concentrations of the products and

reactants are equal.

Explanation:

Answer:

Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number. A property closely related to an atom’s mass number is its atomic mass.

Explanation:

The physical properties (strength, flexibility, and viscosity) of the polymer would change if more borate ion had been added is that it becomes thicker and the viscosity will decreases.

The reaction takes place when the borax is added to the solution. when we add the borax in the solution the glue and the borax will combine and form the new substance that is flexible and the springy. The physical properties like strength, flexibility and the viscosity would change.

Thus, The physical properties (strength, flexibility, and viscosity) of the polymer would change if more borate ion had been added is that it becomes thicker and the viscosity will decreases.

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Maximum amount of ethane formed is 9.47660606 grams .

What is Chemical reaction ?

There are chemical reactions taking place all around us. Nothing could be further from the reality, despite the fact that we occasionally link chemical processes with the sterile surroundings of the test tube and the lab. A staggering, nearly incomprehensible variety of new substances and energy changes actually result from the enormous number of alterations that occur in our environment every second of every day.

Chemical reactions happen whether or not you want them to in nature, where they can be considerably less controlled than in a lab. They can also be more messier. Whether it be a forest fire that is blazing.

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The calculations about the neutralization reaction show that;

1) hydroxide ions has a concentration of  0.0025 M

2) The amount of the HCl is 0.01 moles

3) The reaction equation is; [tex]KOH (aq)+ HCl(aq) ----- > H_{2} O (l)+ KCl(aq)[/tex]

4) The pH of the solution is 7.

We know that the addition of the potassium to the water is going to lead to a reaction that would produce potassium hydroxide as one of the products of the reaction as we can see it; [tex]2K(s) + 2H_{2} O(l) ---- > 2KOH(aq) + H_{2}(g)[/tex]

Number of moles of the potassium used =  0.195g/39 g/mol

= 0.005 moles

Since we produced 0.005 moles of hydroxide ions, the concentration of the hydroxide ions is; 0.005 moles * 500/1000 L = 0.0025 M

ii) Number of moles of the hydrogen ions =  Concentration * volume

= 0.1 * 100/1000

= 0.01 moles

The balanced reaction equation of the neutralization reaction is given by;

[tex]KOH (aq)+ HCl(aq) ----- > H_{2} O (l)+ KCl(aq)[/tex]

The pH of the solution ought to be seven.

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The rate of reaction when 0.4g of zinc trioxocarbonate (iv) reacted with dilute hydrochloric acid to produce zinc chloride and carbon (iv) in  2 minutes is 0.0016 mol/min.

The rate of a reaction is the time taken for product molecules to appear or the time taken for reactant molecules to be converted.

Or

The equation of the reaction is given below:

ZnCO₃ (s) + 2 HCl (aq) ---> ZnCl₂ (aq) + H₂O (l) + CO₂ (g)

Molar mass of zinc carbonate = 125.39=8 g/mol

Moles of zinc carbonate converted = 0.4 / 125.38

Moles of zinc carbonate converted = 0.0032 moles

Time taken = 2 minutes

Rate of reaction = 0.0032/ 2

Rate of reaction = 0.0016 mol/min

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The yield of products formed is:

gold phosphate equals 111.93 grams and the yield of lithium acetate 32.30 grams.

This theoretical yield can be calculated as:

Molar masses of reactants and products that they need. lithium phosphate equals 115.79 grams per mole. Mass of gold phosphate equals 685.87 grams per mole and the molar mass of lithium acetate equals 65.98 grams per mole. Using number of moles and mass of substance produced we can calculate the products formed.

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the WASB has a slightly acidic equivalence point and SASB has a slightly basic equivalence point. This is because WASB has a higher concentration of hydronium ions than SASB.

Hydronium ions play an important role in acid-base reactions. It is the hydrogen ion that is released or taken up in the acid-base reaction. The higher the concentration of hydronium ions, the more acidic the solution. In an acid-base reaction, an acid donates a hydrogen ion to a base. Bases accept hydrogen ions. This creates new water molecules. The equivalence point is the point at which an acid and a base react with 1:1 ratio. At this point the solution is neutral. If the acid has a higher concentration of hydronium ions than the base, the equivalence point is slightly acidic. This is due to the presence of more hydronium ions than at the start of the reaction. If the base has a higher concentration of hydronium ions than the acid, the equivalence point is slightly basic.

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Answer:

Explanation:nitrous acid

An electron of mass travelling in a circular orbit with a constant speed of v makes up a hydrogen atom. The orbital radius is 5*10^- 11 meters. The lepton particle family's first generation includes electrons.

In a hydrogen atom, the electron orbits the nucleus in a circle with a radius of 5*10^- 11 metres. It lasts for 1.5*10^16 seconds. The electron motion is accompanied by a current (electromagnetic charge: 1.6*10^19 C).

The electron is a subatomic particle with the symbol e or and an electric charge of one elementarily negative charge of hydrogen atom. Because they are thought to be elementary particles and do not have any known components or substructure, electrons are part of the first generation of the lepton particle family.

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