You have a solution that contains 100 ml of 1. 5 m potassium carbonate and another 100 ml solution that contains 1. 0 m fecl2 and 2. 0 m nabr. When you mix the two solutions together to form a precipitate. What is the precipitate and how much is formed assuming the insoluble product precipitates completely?.

The % of composition of unknown Ni compound is 5869 %

Composition is the act of combining part or element to form a whole and it is also refer to arrangement type and ratio of atom and molecule in the chemical substances

Here we have to find % composition of Ni compound = ?

For % composition  = mass of element/molecular mass × 100

Mass of Ni = 58.69 u

For % composition  of unknown Ni compound  =  58.69 u × 100

For % composition  of unknown Ni compound  = 5869 %

% composition = 5869 %

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The no. of moles of steam present in the cooker is found to be 0.565 mol using the ideal gas equation.

The ideal gas equation, states that the sum of the universal gas constant and the absolute temperature of a gas is equal to the product of the volume and pressure of one gram of an ideal gas.

The ideal gas equation is PV = nRT. The ideal gas's pressure, volume, total no. of moles, universal gas constant, and temperature are all represented in this equation by the symbols P, V, n, R, and T, respectively.

The no. of moles of a substance is calculated by dividing its mass during a chemical reaction by the mass of one mole of that substance.

Given:

Pressure, P = 4.50atm

Volume, V = 4L

Temperature, T = 115℃ = 273 + 115 = 388K

To find:

No. of moles, n = ?

Formula:

PV = nRT

Calculations:

n = 4.50 x 4 / 0.082 x 388

n = 0.565 mol

Result:

By using the ideal gas equation, 0.565 mol of steam is found to be present in the cooker.

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The molarity of the sodium hydroxide, NaOH solution, given that 18.66 mL was used is 0.107 M

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

KHP + NaOH -> KNaP + H₂O

From the balanced equation above,

1 mole of KHP reacted with 1 mole NaOH.

Therefore,

0.002 mole of KHP will also react with 0.002 mole of NaOH.

Finally, we shall determine the molarity of the NaOH solution. Details below:

Molarity = mole / volume

Molarity of NaOH = 0.002 / 0.01866

Molarity of NaOH = 0.107 M

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16.934 grams of water is formed when 12.5 liter NH3 (at 298 k and 1.50 atm) is reacted with 18.9 l of o2 (at 323 k and 1.1 atm).

Using the formula of ideal gas equation PV = RT

Where P is pressure, V is volume, R is Avogadro’s constant and T is temperature

We calculate the given as,

number of NH3 = n1 

n1= PV/RT 

= 0.7663 moles

number of moles of O2 = n2

n2 = 0.784 moles

now, - 5 moles of O2-------------6 moles of H20

hence, 0.784 moles will give

 6 x 0.784 / 5 = 0.941 moles of H2O 

0.941 moles of H2O = 16.934 gms

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Answer:

the answer is A-Helium

Explanation:

trying to reach 20

Baased on the percent abundances and relative atomic masses of its two naturally occuring isotopes, the average atomic mass of rhenium is 186.252 amu.

To calculate the average atomic mass of rhenium, we need to multiply the relative atomic mass of each isotope with its corresponding percent abundance, and then add the results up.

So, for Re-185:

185 amu * 0.374 = 69.19 amu

(amu = atomic mass unit)

And for Re-187:

187 amu * 0.626 = 117.062

Now we add these two up to reach the average atomic mass of rhenium:

69.19 amu + 117.062 amu = 186.252 amu

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Answer:

PE=mgh

m=mass

g=gravity

h=height

Hello. The answer should be like this in below.

The variable "[tex]m[/tex]" represents the mass. It is a constant value for every substance and is assumed not to change over time.

The variable "[tex]g[/tex]" is the acceleration of gravity. It has a constant value and the numerical value of the gravitational constant for the planet we live on (Earth) is [tex]9.81m/s^2[/tex].

The variable "[tex]h[/tex]" is the distance between sea level and the center of mass of the object. (Height) The unit is meter.

Answer

The rate increases to eight times the original rate.

Explanation

When the concentration of each reaction is doubled, the rate increases by eighth compared to the initial rate.

Example: Rate =k[A][B]^2

Lets assume : [A]1 = 0.1 and [A]2 = 0.2

[B]1 = 0.2 and [B]2 = 0.4

Initially: Rate = (0.1)(0.2)^2 = 4x10^-3

After doubling: Rate = (0.2)(0.4)^2 = 0.032

Divide the final answer by the initial one

=> 0.032/4x10^-3 = 8

We can see here that the both measurements are accurate. This is the true because the both values are in the correct number of significant figures.

The term density has to do with the ratio of the mass to the density of the object. We know that the accuracy of a measurement has a lot to do with the number of significant figures in the measurement. In this case, we are told that two students in a lab are asked to calculate the density of a block with a mass of 31.0 g; they are not told how many digits to round their measurements. Student A finds length to be 2 cm width to be 4 cm and height 8 cm. Student B finds the length to be 2.65 cm, width to be 4.20 cm, and height to be 8.35 cm.

For the first student, the density is obtained as;

Density = mass/ volume

= 31.0 g/ 2 cm * 4 cm *  8 cm

= 0.5 g/cm^3

For the second student;

Density = mass/ volume

= 31.0 g/2.65 cm * 4.20 cm * 8.35 cm

= 0.33 g/cm^3

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The hydrolysis of  ATP into ADP and inorganic phosphate is an exergonic reaction that drives many endergonic reactions in a cell.

Adenosine triphosphate (ATP) is a molecule that can store chemical energy in high-energy phosphoanhydride bonds. These bonds can be split to release chemical energy, for example in muscles. This process is known as ATP hydrolysis.

ADP has a higher entropy than ATP, which is a measure of chaos. The reaction therefore happens spontaneously because it desires to be at a higher entropy level owing to thermodynamics. Additionally, ATP has a greater Gibbs free energy value than ADP.

In order to proceed, an endergonic reaction needs free energy. Photosynthesis is an instance of an endergonic process of biological importance.

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The volume of carbon dioxide given off when 0.9 grams of glucose ferments is 0.22414 Liters.

The molecular weight of glucose is 180 grams/mole. Moles of glucose are calculated by the mass of glucose divided by molecular weight.

Moles of glucose = 0.9 ÷ 180 = 0.005

According to the stoichiometry of the reaction C6H12O6 → 2C2H5OH + 2CO2, moles of CO2 produced by the fermentation of glucose are two times the moles of glucose. So, the moles of CO2 produced are 0.01

At r.t.p., the volume of 1 mole of any gas is measured to be 22.214 L

hence, the volume of 0.01 moles of CO2 = 0.01 × 22.214 = 0.22214 L

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The statement about chemical reaction is true is :

B) The reaction rate can increase.

A) The rates are always constant is not true. for a chemical reaction, the rate of chemical reaction does not remains constant because rate depends on the concentration of reactants.

B) The rate of reaction can increase is true . for a chemical reaction , the rate of reaction can be increase by increasing the concentration of reactant.

C) The rate of reaction cannot change is not true.

D) The rate of reaction cannot decreases is not true . reaction rates

decreases with time .

Thus, The statement about chemical reaction is true is :

B) The reaction rate can increase.

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The boiling point would remain unchanged, because boiling point does not depend on the volume of the liquid.

What is a boiling point?

The temperature at which a liquid's vapor pressure equals the pressure around it and the liquid transforms into a vapor is known as the boiling point of a material. A liquid's boiling point changes according on the atmospheric pressure in the area.

A liquid's boiling point changes depending on the pressure being applied; the normal boiling point is the temperature at which the vapour pressure is equal to the average atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). Water boils at sea level at 100° C (212° F).

Hence, the boiling point will remain unchanged.

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Answer:

A miniature keychain lamp produces one or two lumens

Answer:

D. They have the same number of protons as electrons.

Explanation:

Protons are found in the nucleus of the atom and have a positive charge while electrons orbit around the nucleus and have a negative charge. Usually, in a neutral atom of an element, the number of protons is equal to the number of electrons. This is why the atom has no charge because the positive and negative charges cancel out. When an atom loses an electron its charge turns positive while when it gains an electron its charge turns negative.

The equator is warmer because of the greater angle at which the sun's rays strike Earth's surface at the equator i.e. option D.

What do you mean by the Equator?

An Equator is a hypothetical line that circles a planet or other celestial body in the center.

As the climate at the poles is cooler than that close to the equator. This is because  Sun's rays are impinging at an angle on high latitudes due to the curvature of the Earth.

This is because as you walk away from the equator, the Earth's surface gradually tilts away from the sun (the sun is lower on the horizon).

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The experimental value has a 0.278 % error when compared to the literature / actual value.

The absolute value of the difference between the measured or the experimental value and the literature or actual value is multiplied by 100 and divided by the actual value to get the percent (%) error calculation.

Serious repercussions might happen if the analysis contains a significant inaccuracy. Analytical chemistry is built on the principles of precision, repeatability, and dependability.

The following actions can help reduce % error: guarantee that observers and measurement takers have received enough training. Use the most precise measuring device for taking the reading. Measurements must be recorded in a controlled environment. Test your measurement equipment on a pilot.

Given:

1 mol of H2 = 2.02g

To find:

% error = ?

Formula:

% error = (experimental value – literature value) / literature value x 100

Calculations:

Recall that, at STP

most gases will occupy 22.4L if they are ideal gases

Therefore,

Density = Mass / Volume

Density = 2.02g / 22.4L = 0.09017g/L

This is the experimental value for density of H2

Literature value = 0.08992g/L

% error = (0.09017 - 0.08992) / 0.08992 x 100 = 0.278% error

Result:

The % error is found to be 0.278%.

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6 electrons are lost in all in redox reaction between aluminium  and manganese ion as aluminium looses  3 electrons to get oxidized and manganese get 2 electrons to get reduced hence 3×2=6 electrons are lost.

Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.

While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species. Electrons which are given off in oxidation are used up in reduction.

The ion or molecule which accepts electrons is called as oxidizing agent while the ion or molecule which donates electrons is called as a reducing agent.

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White milk is a colloidal solution, Pepsi is a solution, Oxygen is a pure substance, vinegar is a solution and vegetable salad is a mechanical mixture.

Pure substances have a stable or unchanging structure and ar created from only one form of particle. parts and compounds ar subclasses of pure substances. a cloth that only contains one kind or category of atom is alleged to be a component.

In contrast to a chemical composition, a mechanical mixture has components that can be separated mechanically.

A solution is an amalgam of ions or molecules (very, very small).

A suspension may appear cloudy or muddy due to the greater particle sizes present.

Sol is another name for a colloidal solution. Colloidal particles make up the dispersed phase in a sol, which has a continuous medium known as the dispersion medium.

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The mass of platinum present in a 37g sample of this compound is calculated to be 27.136 g

To determine the mass of platinum we first determine the empirical formula as follows;

chlorine: mass / molar mass = 2.30 / 35.453 = 0.065 moles

platinum: mass / molar mass = 6.33 / 195.084 = 0.032 moles

Now dividing each of the calculated mole values by the smallest number of moles;

chlorine: 0.065 / 0.032 = 2.03 ≈ 2

platinum : 0.032 / 0.032 = 1

Therefore the empirical formula would be [tex]PtCl_{2}[/tex]

Now we have to find the mass of platinum in 37g of [tex]PtCl_{2}[/tex];

mass of platinum / total mass = x / 37

x / 37 = ( 195.084)/(195.084 + 2×35.454)

x / 37 = 0.73342

x = 37 × 0.73342

x = 27.136

Hence the mass of platinum in a 37g sample of this compound is calculated to be 27.136 g

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A reaction's rate constant is discovered to be 0.15 . If the initial concentration of the reactant is 0.30 m, 22.2 sec of time does it take for the concentration to decrease to 0.15 m.

1/[A]t=kt+1/[A]o

t=(1/[A]t−1/[A]o)/k=(1/0.15−1/0.30)/0.15=22.2seconds

Mathematically, time and other physical quantities can be coupled to create additional ideas like motion, kinetic energy, and time-dependent fields. The basis of recordkeeping is timekeeping, a complex of technological and scientific challenges. Time is change, or the span of time during which change takes place with motion. Without a change, it is impossible to detect the passage of time. Comparison with a standard is used to calibrate the length of time or change.The SI unit of time is called the second, abbreviated as s. Time can be used to quantify, compare, or even order events based on their duration or the intervals between them. One method of making efficient use of resources is to use time study and motion study, which enhance output and performance.

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Low pressure is usually located near the equator whereas high air pressure is usually located over the  North and South Poles.

Areas in low latitudes close to the equator are alluded to as the tropics. Sunlight hits the Earth’s surface there at a high angle. It is about a 90° point all year round. As a result, the tropics receive more sunlight per unit of surface range than other places on Earth. This causes the arrival, the water, and then the air at the equator to always be warm. At scopes close to the North Pole and the South Pole, sunlight strikes Earth’s surface at a low angle. Sunlight is spread over a larger surface region than within the tropics. This implies that the poles receive exceptionally small energy per unit of the surface zone and so they are cooler. Since that warm air rises and cold air sinks. Warm air is much less denser than cold air. Rising warm air puts less pressure on Earth than cooler air. Air pressure is ordinarily low over the tropics because it is as a rule warm there. Air pressure is as a rule high over colder zones such as the North and South Posts.

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Antacids neutralize the hydrochloric acid in your stomach  the correct Neutralization reaction of stomach acid with milk of magnesia is

Mg(OH)2(s) + 2HCl(aq) ==> MgCl2(aq) + 2H2O(l)

Heartburn, indigestion, and upset stomach can be treated with antacids, which neutralize stomach acid. Some antacids have been used to treat diarrhea and constipation. Marketed antacids include sodium, calcium, magnesium, or aluminum salts. Some medications have two salts in combination, like magnesium carbonate and aluminum hydroxide.

In a chemical reaction known as neutralization an acid and a base interact quantitatively. By neutralizing a reaction in water, surplus hydrogen or hydroxide ions are removed from the solution.

Because milk of magnesia is an alkaline suspension, anything acidic it comes into contact with triggers a neutralizing reaction. Because of this, when taken internally, it effectively combats excess stomach acid.

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The mass of the water in the beaker is 11.9 grams. The energy needed to convert the mass is 3748.5 J. The total energy needed to vaporize the water is 6997.2 J.

Energy is defined as the quantitative property that is imparted to a body or physical system and is visible in the performance of work as well as in the form of heat and light.

There are basically two types of energy.

Formula for calculating the mass is

q = mcΔT

m = q / cΔT

m = 1100 J / 4.2 J / g °C x (47-25°C)

m = 11.9 grams

The energy can be calculated as

q = 11.9 g x 4.2 J / g °C x (100 - 25°C)

q = 3748.5 J

The total energy is

q = 11.9 g x 4.2 J / g °C x [120-(-20°C)]

q = 6997.2 J

The amount of heat removed is

q = 2.76 g x 4.2 J / g °C x (100 - 25)

q = 869.4 J

Thus, the  mass of the water in the beaker is 11.9 grams. The energy needed to convert the mass is 3748.5 J. The total energy needed to vaporize the water is 6997.2 J.

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150.0 g of a metal sample heated to 75.0 oC is introduced to 150.0 g of water heated to 15.0 oC. In a sealed, dark container, the water's temperature rises to 18.3 oC. The metal's specific heat is 0.24 J/g of temperature.

Specific heat is the amount of energy needed to raise a substance's temperature by one degree Celsius per gramme. Typically, the units of specific heat are calories or joules per gramme per degree Celsius. The specific heat of water, for instance, is 1 calorie (or 4.186 joules) per gramme per degree Celsius. In the 18th century, the Scottish scientist Joseph Black noted that equivalent masses of various substances required varying quantities of heat to elevate them across the same temperature range. Based on this discovery, he developed the theory of specific heat. Early in the 19th century, French physicists Pierre-Louis Dulong and Alexis-Thérèse Petit proved that calculating a substance's atomic weight is possible by measuring its specific heat (see Dulong-Petit law).

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In the titration of acetic acid and NaOH using an indicator, the reported mass percent of acetic acid is higher.

To indicate the color shift, a small amount of base is applied to the indicator. This yields the titration end point. It should be emphasized that this tiny surplus of base is used by the indication rather than the titre. This indicates that titration has already been finished, and the added base helps elevate pH, causing the indicator to change hue.

[tex]M_{acid} V_{acid} = M_{base} V_{base}[/tex]

[tex]V_{base}[/tex] will be somewhat higher, resulting in a slightly higher estimated value of [tex]M_{acid}[/tex].

[tex]M_{acid} = M_{base} V_{base} / V_{acid}[/tex]

This mistake is insignificant since very little excess is required for the indicator to change color.

During the titration of NaOH versus [tex]CH_3COOH[/tex] using indicator, the number of [tex]OH^-[/tex] ions required to reach the end point equals the number of [tex]H^+[/tex] ions from the analyte, [tex]CH_3COOH[/tex] plus the number of [tex]H^+[/tex] ions from the indicator, resulting in a slightly higher calculated molarity of acetic acid and a higher reported mass percent of acetic acid.

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A phenol red solution changes color as there is change in pH. A molecule that will cause a decrease in pH as its levels increase is an acid. Acids are molecules that release H+ ions in solution, and this increase in H+ ions decreases the pH of the solution.

A decrease in pH indicates an increase in the concentration of hydrogen ions in a solution. One molecule that can cause this is carbonic acid (H2CO3). Carbonic acid is formed when carbon dioxide (CO2) dissolves in water and reacts with water molecules to form H+ and HCO3- ions. The H+ ions increase the acidity of the solution and decrease the pH.

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The enthalpy of the process could be obtained as -14.22 kJ/mol.

We have to find the number of moles of the calcium chloride from;

1. 00 M * 25/1000L = 0.025 moles

Number of moles of the calcium fluoride = 2.00 M * 25/1000 L = 0.05 moles

Given that 1 mole of  calcium chloride reacts with 2 moles of  calcium fluoride

0.025 moles of calcium chloride reacts with 2 moles  *  0.025 moles/1 mole

= 0.05 moles

Hence, calcium chloride is the limiting reactant.

The total mass of the solution = 25 ml + 25 ml  = 50 ml

Mass of the solution = 50 g

The heat lost = -( 50 g * 4. 184 j/°c•g * (26. 7°c * 25. 0°c)) * 10^-3/0.025 moles

= -14.22 kJ/mol

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Answer:

48.059

Explanation:

Find on periodic table and add

32.06+15.99