potassium iodide reacts with lead (ii) nitrate to form lead (ii) iodide and potassium nitrate. what are the reactants? what are the products?

Always wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron whenever using concentrated acids or acid solutions. Purchase dilute acids whenever possible Acid handling requires the use of latex gloves. Solvent and chemicals in miscellaneous category require the use of polythene gloves. Check the gloves for any pin-holes prior to use. Wash your hands before eating, even if gloves were used while handling the chemical.  

i know it'sis a lot and it's a little messed up but can you handle it if you can and if it's right you mind giving me a brainliest?

Always wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron whenever using concentrated acids or acid solutions

Answer:

For addition and subtraction use the following rules:

1. Count the number of significant figures in the decimal portion ONLY of each number in the problem

2. Add or subtract in the normal fashion

3. Your final answer may have no more significant figures to the right of the decimal than the LEAST number of significant figures in any number in the problem.

Explanation:

The mass of water required to change the temperature of water from 25.0°C to 35.0°C when 4,000 joules of energy are released is 95.6g.

The mass of a substance in a calorimetry procedure can be calculated by using the following formula:

Q = mc∆T

Where;

According to this question, a sample of water is changed from 25.0°C to 35.0°C when 4,000 joules of energy are released. The mass of the water sample is as follows:

4000 = m × 4.184 × 10

4000 = 41.84m

m = 95.6g

Therefore, 95.6 grams is the mass of the water sample.

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An increase in the surface area of the solid will increase the rate of the reaction.

The reaction rate will be influenced by the solid's surface area if one of the reactants is solid. This is due to the fact that the two kinds of molecules can only collide at the liquid-solid interface, also known as on the surface of the solid. The reaction rate will rise due to a more significant interaction of the surface areas between the two molecules when the solid is pulverized into a gas. If a reactant has a larger surface area: The other reactant is exposed to more particles. Particles are more likely to collide, which results in more successful collisions per second this will influence the reaction speed to increase.

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The reactivity of a substance with oxygen is a chemical, not a physical property. The reason it is called a chemical property is that it relies on its electron configuration to determine how it behaves around other substances.

A chemical property is a property of any material that becomes apparent during or after a chemical reaction; that is, any quality that can only be determined by changing the chemical properties of a substance.

Oxygen is a very reactive element, is highly paramagnetic and readily combines with other elements. One of the most important chemical properties of oxygen is that it promotes combustion. Even at room temperature, oxygen binds to elements and forms e.g. rust.

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The cell obtain more magnesium through Active transport.

Active transportation uses include:

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From the diagram showing an example of convection, the label that belongs on the arrow is cooler water sinks while hotter water rises.

Convection currents are currents that are set up by particles of a substance that transfer heat by the process of convection.

Convection is a form of heat transfer in which the particle of the substance transferring heat move from one point to another transferring heat as they move.

Convection is one of the three processes of heat transfer. The two other processes of heat transfer are conduction and radiation.

In the diagram shown, the heat transfer process show is convection.

The heat supplied by the flame is transferred from the bottom of the pot to the top by the movement of the water molecules. Heated water molecules move up while cold water molecules move down to replace them, thus, setting up a convection current.

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Answer: Homogenous mixture

Mixing honey with water will give you a homogenous mixture. It is uniform and even, as the honey particles are distributed equally throughout the water.

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The student used an acid-base extraction method to isolate three compounds. In this lab, students will use solvents of different polarity (mobile phases) to determine the optimal separation of the pigments found in spinach extracts.

Mixtures are physical mixtures or additional materials that retain their inherent properties and come together in the form of a reaction, suspension, or colloid. Combinations are materials made from materials or other uniquely styled materials. It can be separated using physical methods. Examples include solutions of salt and water, mixtures of sugar and water, various gases, and air.

The mixture consists of one or more pure materials with different compositions. There are heterogeneous and homogeneous types of mixtures. Dissimilar combinations have visually distinguishable additives, while homogeneous combinations appear uniform throughout. Agglomerates are created by the mixing of two or more distinct substances in the body and can be separated from below into their original substances. A chemical reaction occurs when additional substances combine to form a completely new substance and cannot be separated back into the original substance.

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To determine the total number of elements in a chemical formula is being able to recognise the elements of the chemical formula.

An element is defined as the chemical substance that cannot further be divided by any chemical process into smaller particles.

A chemical formula is a representation for a chemical compound or molecules which contains one or more elements with the number of atoms attached as a subscript.

An example of a chemical formula is NaCl. This chemical formula contains one element of sodium (Na) and one element of chlorine (Cl).

In order to determine the total number of elements in a chemical formula, the elements should be recognised and the subscript attached to the element shows the number of atoms of the element found in that particular formula.

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In other to increase the electric force between two charged particles by a factor of 16, the charged particle is increased by 16.

This is referred to as the repulsive or attractive interaction between any two charged bodies and we should note that like poles repel and unlike poles attract.

One of the charged particle has to be increased by 16 for there to be an increase in the electric force between the particles by a factor of 16 and it can seen below:

F1/ F2 = kq1q2/r² / 16kq1q2 / r² where f is force, q is the charge and r is distance between charges.

F1 / F2 = 1/16

F2 = 16F1

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Answer:

q2

Explanation:

Both the reactants are gases at STP.

Equation:

2H2S + 302 → 2SO2 + 2H2O

As per this equation 2 moles (2 x 22.4 L) of H2S

need 3 moles (3 x 22.4 L) of oxygen for their

complete oxidation.

So, volume of oxygen needed for 2.8 L of H2S =

(2.8 x 3 x 22.4)/(2 x 22.4) = 4.2 L (answer)

(a) H₂O(g) represents water in the gaseous state. It is produced as a product of the reaction between hydrogen sulfide (H₂S) and oxygen (O₂).

Gaseous state refers to a substance existing as a gas. When a substance is in the gaseous state, its particles are not closely packed together like in a solid or liquid state. Instead, they are spread out and move freely, filling the available space.

(b) To calculate the volume of oxygen required to react with 50 cm³ of hydrogen sulfide, we need to use the stoichiometry of the reaction. From the balanced equation, we can see that the molar ratio between hydrogen sulfide (H₂S) and oxygen (O₂) is 2:3.

Given: Volume of hydrogen sulfide (H₂S) = 50 cm³

Using the molar ratio, we can set up the following proportion: 2 mol H₂S / 3 mol O₂ = 50 cm³ H₂S / x cm³ O₂

To find the volume of oxygen, we can solve for x:

x = (50 cm³ H₂S * 3 mol O₂) / 2 mol H₂S

Now, we need to convert the obtained moles of oxygen to volume using the ideal gas law. Since the volume is given in cm³, we can assume that the temperature and pressure are constant at standard conditions (typically 0°C and 1 atm).

Using the ideal gas law equation: PV = nRT

Assuming constant temperature and pressure, we can rearrange the equation as: V = (n * R * T) / P

Substituting the values: V = (moles of O₂ * 22.4 L/mol) / (1 atm)

Calculate the moles of O₂ using the obtained value from the proportion.

Finally, convert the volume from liters to cm³ by multiplying by 1000.

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Answer:Dmitri Mendeleev

Explanation:

The ddt in the soil with half-life of 12 years needs 44.4 years to decompose.

We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation

N = No(1/2)^(t/t'')

where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.

From the question above, we know that

t'' = 12 yr

N = 15 ppbm

No = 195

By substituting the given parameter, we can calculate the required for decomposing

N = No(1/2)^(t/t'')

15 = 195(1/2)^(t/12)

1/13 = (0.5) ^ (t/12)

t/12 = ⁰'⁵log(1/13)

t/12 = 3.7

t = 44.4 years

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Answer:

20

Explanation:

Pressure = Force / Area of Piston

0.5x0.5=0.25

5/0.25=20

----------------------------------------------------

If that answer doesn't work then try not squaring the 0.5

5/0.5=10

Activation polarization is occuring due to the evolution or deposition of some gases taking place in a redox reaction. Concentration polarization occurs between two electrodes when uneven distribution of ions occurs in the boundary.

Polarization is the process of charge separation between two species or the potential difference occurred due to the concentration gradient.

The two types of polarization occuring are activation polarization and concentration polarization. In activation polarization there occurs difference by the accumulation of gases.

For example the evolution of gases from the hydrogen electrode immersed in an electrolyte causes a polarization between the two electrodes.

In concentration polarization, there will be a concentration gradient of ions in the boundary of two electrodes occured due the electroanalytical reaction.

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The percent of sodium hypochlorite in the bleach sample is calculated to be 9.44% if 3.06 g of sodium hypochlorite is present.

Percentage can be calculated by dividing a value by the total value and then multiplying the resultant by 100.

In this case, we can determine the percentage of sodium hypochlorite in the bleach sample by dividing the mass of sodium hypochlorite by the total mass of the sample and then multiplying the resultant by 100 as follows;

percent of sodium hypochlorite = (mass of sodium hypochlorite/mass of sample) × 100

As 3.06 g of sodium hypochlorite is present in 32.4 g of the sample of bleach, substituting these values in the equation as follows;

percent of sodium hypochlorite = (3.06 ÷ 32.4) × 100

percent of sodium hypochlorite = 0.0944 × 100

percent of sodium hypochlorite = 9.44%

Therefore the percentage of sodium hypochlorite in the bleach sample is calculated to be 9.44%.

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Answer: type the compound into your search bar then it should tell you what it is for 3. you should look up "what is the formula for -----" same thing for #4

Explanation:

Answer:

2.a.  germanium tetrahydride

2.b. dinitrogen tetrabromide

2.c. diphosphorus pentasulfide

2.d. selenium dioxide

2.e. nitrogen trihydride

2.f. silicon dioxide

3.a. PO3

3.b. SiCl4

3.c. N2O5

3.e. N2O4

3.f. CO

4.a CO2

4.b. SF6

4.c. N2Cl4

4.d. CI4

4.e. PF5

4.f. P2O5

****All numbers are subscripts, please do not write them as is, but to the bottom right of them like shown in the options from question 2.

Explanation:

To name covalent compounds (NM+NM), we use prefixes.

To name covalent compounds goes as follows:

First, name the first element in the formula the normal name it has (ex. Nitrogen, Oxygen). If the first element is present more than once shown by a subscript, use a prefix that will indicate how many there are present (ex. mono, di, tri).

Next, name the second element in the compound using prefixes aswell if present more than once. These elements though, will end with -ide instead of their original name (ex. monoxide, dibromide, trichloride).

A sample of gas occupies a volume of 70.3 ml as it expands, it does 140.6 j of work on its surroundings at a constant pressure of 783 torr and the final volume of the gas is 11.12L

A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container and even in the presence of gravity and regardless of the amount of substance in the container

Here given data is 11.12L

V₁ = Initial volume = 70.3 ml = 0.0703ml =  (1L=1000ml)

w = 140.6 J = 1.387 J = (1Latm=101.3J)

Pressure =  783 torr = 1.03 atm  = (1atm=760 torr)

V₂ = final volume = ?

1.387Latm = 1.03 atm × (V₂ - 0.0703ml)

(V₂ - 0.0703ml) = 11.05

V₂ = 11.12L

The final volume of the gas is 11.12L

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By calculating the response factor for the internal standard first, we can calculate that the concentration of the unknown analyte sample is 2.64 ppm.

When solving problems like this, we need to calculate the appropriate response factor:

A(X) / C(X) = F * A(S) / C(S)

A(X) - response for the analyte (3.47)

C(X) - concentration of the analyte (1 ppm)

F - response factor

A(S) - response for the internal standard (5.23)

C(S) - concentration of the internal standard (1 ppm)

F = A(X) * C(S) / (C(X) * A(S)

F = 3.47 * 1 ppm / (5.23 * 1 ppm)

F = 0.663

Now we can use this in the second calculation to obtain the concentration of the analyte in the sample. One thing to note is that in second measurement 1 mL of a 5.00 ppm internal standard was diluted to 10 mL, so the concentration of the internal standard is actually 5.00 ppm / 10 = 0.500 ppm.

4.26 / C(X) = 0.663 * 2.43 / 0.500 ppm

C(X) = 4.26 * 0.500 ppm / (0.663 * 2.43)

C(X) = 1.32 ppm

Because 5 mL of the analyte solution were diluted to 10 mL, the concentration is actually 2 * 1.32 ppm = 2.64 ppm.

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The percent by mass concentration of calcium chloride is 0.20%

What is mass concentration?

Mass concentration, which is a quantity to measure this same concentration of a solute in the solution, is similar to molar concentration, molality, and mass fraction. It reveals how much of a solute there is in a certain volume of solution. Let's use coffee as an example to try to understand it. By combining coffee, sugar, and hot water, a straightforward instant coffee can be made. 10 g of coffee and 5 g of sugar are required to make a typical cup (250 mL) of coffee. Depending on individual preferences, the sum may change. We will need twice as much of the ingredients—20 g of caffeine and 10 g of sugar—to make two cups (500 mL).

When the mass of a solute as well as the mass of a solution are given, the mass percent is employed to express this same concentration of a solution:

Mass Percent=Mass of Solute/Mass of Solution×100%

% by mass = mass of substance/ mass of solution * 100 %

                   = 1.54/750*100 % = 0.20%

The percent by mass concentration of calcium chloride is 0.20%

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It is the 400 nm photon that has the greater energy by a factor of 1.77.

We know that the wavelength has to do with the horizontal distance that is covered by a wave. We know that the longer the distance that is covered then the weaker the wave. In other words, the wavelength of the wave is inversely proportional to the to the energy of the wave. The greater the wavelength, the lesser the energy.

Let us now find the energy of each of the wavelengths;

E = hc/λ

E = energy of the light

h = Plank's constant

c = speed of light

λ = wavelength

For the  700 nm photon;

E = 6.6 * 10^-34 * 3 * 10^8/ 700 * 10^-9

E = 2.8 * 10^-19 J

For the 400 nm photon;

E = 6.6 * 10^-34 * 3 * 10^8/ 400 * 10^-9

E=  4.95 * 10^-19 J

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Acid - base pairs.

Arrhenius theory, says, that acids are substances that dissociate in water to yield electrically charged atoms or molecules, called ions, one of which is a hydrogen ion (H+), and that bases ionize in water to yield hydroxide ions (OH−).

It is now known that the hydrogen ion cannot exist alone in water solution; rather, it exists in a combined state with a water molecule, as the hydronium ion (H3O+). In practice the hydronium ion is still customarily referred to as the hydrogen ion.

----------------------------------------------------------------------------------------------------------------

a) HClO3 + H2O <=> H3O + + ClO3-

HClO3 is the acid, ClO3- is the base (acid-base pair)

H2O acepts that H+ from the HClO3, and becomes H3O+

H2O is a base, H3O+ is the acid (acid-base pair)

----------------------------------------------------------------------------------------------------------------

b) HSeO4 - + NH3 <=> NH4 + + SeO4 2-

Here HSeO4 - can free one H so it would be the acid, and SeO4 2- is the base.

NH3 receives H+ from acid, so it is the base, and NH4+ is the acid.

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c) HCO3- + OH - <=> CO3 2- + H2O

HCO3- gives away one H, so it is the acid, and CO3 2- is the base

(HCO3-,CO3 2-) acid-base pair.

OH- receives the H+ and becomes H2O. OH- is the base and H2O acid.

H2O can be acid and base, remember that. In this case it is the acid.

---------------------------------------------------------------------------------------------------------------

d) C5H5NH + + H2O <=> C5H5N- + H3O+

C5H5NH has the H, but on the right it doesn't, so it would be th acid. C5H5N- is the base.

H2O here is a base, because it receives the H+, and becomes H3O+ (the acid).

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Answer:

Enzymes act as catalysts, accelerating the chemical reaction by lowering the activation energy. Activation energy is the energy needed for the particles to react. Enzymes come out of the reaction unchanged.

Explanation:

Explanation:

The release of O₂( oxygen gas) from the process of photosynthesis is made disks to be able to float.

Photosynthesis can be described as the process in which green plants manufacture their food in the presence of sunlight which is trapped by the chlorophyll of the leaves. They are also called primary producers and they use compounds such as water and carbon dioxide.

The spinach leaf disks intake carbon dioxide from a sodium bicarbonate solution and sink to the bottom of a beaker. When the beaker is exposed to light, the disks use carbon dioxide gas and water to produce oxygen gas and glucose. Oxygen gas released from the leaves due to photosynthesis forms tiny bubbles that make the leaves float.

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The volume of the balloon when the balloon descended down in the water becomes 0.0217 Liters.

We know, from the Boyle's Law,

If the temperature of a gas is kept constant, the pressure of the gas and the volume of the gas becomes inversely proportional to each other.

So, we can write,

P₁V₁ = P₂V₂

Where,

P₁ is the initial pressure of the gas,

V₁ is the initial volume of the gas,

P₂ is the final pressure of the gas,

V₂ is the final volume of the gas.

According to the given condition, the initial volume of the ideal gas was 1.52 L and the initial pressure of the gas is 1 atm and the final pressure of the gas is 70 atm while the final volume is unknown,

So,

1.52 x 1 = V₂ x 70

V₂ = 0.0217 Liters.

The final Volume of the gas is 0.0217 Liters.

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Answer:

384.9 mL.

Explanation:

What is given?

Volume 1 (V1) = 823.7 mL.

Pressure 1 (P1) = 351.8 torr.

Pressure 2 (P2) = 752.9 torr.

What do we need? Volume 2 (V2).

Step-by-step solution:

This is a Boyle's Law problem. Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases.

The formula of the law is:

Where P is pressure and V is volume. We want to find volume 2, 'V2'. So let's solve for 'V2' and replace the given data that we have in the new formula:

The new volumewill be 3384.9 mL You can note as the pressure is increasing, the volume is decreasing.