Read the list of substances. Spoon, Styrofoam cup, Scissors, Pencil. Which substances are likely to float in water?
A) Spoon and Scissors
B) Scissors and Pencil
C) Styrofoam cup and Spoon
D) Styrofoam cup and Pencil​

Answer:

17.2mL

Explanation:

Step 1:

Determination of the molarity of potassium phosphate K3PO4 solution.

This is illustrated below:

Mass of K3PO4 = 46.3g

Molar Mass of K3PO4 = (39x3) + 31 + (16x4) = 212g/mol

Mole of K3PO4 =..?

Mole = Mass /Molar Mass

Mole of K3PO4 = 46.3/212 = 0.218 mole

Volume of water = 250mL = 250/1000 = 0.25L

Molarity = mole /Volume

Molarity of K3PO4 = 0.218/0.25

Molarity of K3PO4 = 0.872M

Step 2:

Determination of the volume of the stock solution of K3PO4 needed.

Molarity of stock solution (M1) = 0.872M

Volume of stock solution needed (V1) =..?

Molarity of diluted solution (M2) = 0.1M

Volume of diluted solution (V2) = 150mL

The volume of the stock solution needed can be obtained as follow:

M1V1 = M2V2

0.872 x V1 = 0.1 x 150

Divide both side by 0.872

V1 = (0.1 x 150)/0.872

V1 = 17.2mL

Therefore, the volume of the stock solution needed is 17.2mL

Answer:

In this type of solution, perchloric acid is a strong acid which means that its conjugate base is extremely weak. As such, the solution of HClO4 H C l O 4 and NaClO4 N a C l O 4 is not a buffer solution.

Answer:

1. Yes, no, no

2. No, yes, no

3. Yes, Yes, No

Explanation:

Three states of matter exist – solid, liquid, and gas. Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume.

Answer:

Explanation:

Ok so for the first row I believe is Yes, No, No

Second row  No, yes, No

last row i dont know

I hope this helped

(p.s I have't done this in a couple of months so it might be wrong and i am so sorry if it is.)

The peroxide addition would yield a product that is different from the antiperoxide addition

Markovnikov's rule states that when a protic acid HX is added to an alkene, the acid hydrogen (H) forms a bond with the carbon atom that has the greatest number of hydrogen atoms, while the halide (X) group forms a bond with the carbon atom that has the fewest hydrogen atoms.

This can be summed up with the phrases "the rich get richer" and "the poor get poorer" in terms of hydrogen. This fundamental principle of alkene chemistry aids in predicting the results of addition reactions.

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Approximately 631.5 liters of dry air at 25°C and 750 torr would need to be processed to produce 150 liters of liquid \(O_2\) -183°C.

To solve this problem, we need to consider the ideal gas law and the molar volume of gases.

First, we can calculate the number of moles of oxygen in 150 L of liquid \(O_2\) at -183°C. To do this, we divide the mass of liquid oxygen by its molar mass:

Mass of liquid oxygen = volume of liquid oxygen * density of liquid oxygen = 150 L * 1.14 g/mL = 171 g

Molar mass of oxygen (O2) = 32 g/mol

Number of moles of oxygen = mass of oxygen / molar mass of oxygen = 171 g / 32 g/mol ≈ 5.34 mol

Since the mole fraction of oxygen in dry air is given as 0.21, we can calculate the total moles of dry air needed to produce 5.34 mol of oxygen:

Moles of dry air = moles of oxygen / mole fraction of oxygen = 5.34 mol / 0.21 ≈ 25.43 mol

Now, we can use the ideal gas law to calculate the volume of dry air at 25°C and 750 torr (convert to atm) that corresponds to 25.43 mol:

PV = nRT

P = 750 torr * (1 atm / 760 torr) ≈ 0.987 atm

V = volume of dry air (unknown)

n = 25.43 mol

R = 0.0821 L·atm/(mol·K)

T = 25°C + 273.15 = 298.15 K

Solving for V:

V = nRT / P = (25.43 mol)(0.0821 L·atm/(mol·K))(298.15 K) / 0.987 atm ≈ 631.5 L

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Answer:

\(K=1.7x10^{-3}\)

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to solve this problem by firstly setting up the equilibrium expression for the given reaction, in agreement to the law of mass action:

\(K=\frac{[NO]^2}{[N_2][O_2]}\)

Next, we plug in the given concentrations on the data table to obtain:

\(K=\frac{(0.034)^2}{(0.69)(0.98)}\\\\K=1.7x10^{-3}\)

Regards!

Answer:

Anaerobic metabolism

Overview. Anaerobic metabolism is the creation of energy through the combustion of carbohydrates in the absence of oxygen. This occurs when your lungs cannot put enough oxygen into the bloodstream to keep up with the demands of your muscles for energy.

Explanation:

One important chemical reaction in our daily life is the process of cellular respiration, which occurs in living organisms to produce energy in the form of ATP.

The reaction involves the breakdown of glucose, a type of sugar, into carbon dioxide and water, and the release of energy in the process. The general equation for cellular respiration is,

\(C_{6} H_{12} O_{6}\) + \(6O_{2}\) → \(6CO_{2}\) + \(6H_{2}O\) + energy (ATP)

This reaction occurs continuously in our cells, providing the energy needed for various cellular activities and bodily functions. Without cellular respiration, we would not be able to survive.

Another important application of chemical reactions in daily life is in the production of food. Cooking food involves various chemical reactions, including the breakdown of complex carbohydrates and proteins into simpler molecules, the caramelization of sugars, and the Maillard reaction between amino acids and reducing sugars. These reactions help to create the flavor, aroma, and texture of the food we eat.

In addition, chemical reactions are also used in the production of many consumer products, such as cleaning agents, cosmetics, and pharmaceuticals. The chemical reactions involved in these products are carefully designed and controlled to ensure their effectiveness and safety for use.

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Answer:

moringa tree has seeds that have unique properties towards water purification

Explanation:

the seeds of moringa tree have an extract which can separate unwanted particulates from the water sediment impurities.

they have the

anti-microbial treatment potentials

moringa also has various vitamins since it is a plant tissue

Based on the given information, it is not possible to accurately predict which number is the predicted yield, the actual yield, and the percent yield without additional information or context. The percent yield is calculated by comparing the actual yield to the predicted yield, which are both typically measured in grams or moles.

The list of the factors that will increase the reaction rate of a chemical reaction are

The Factors that can increase the reaction rate of a chemical reaction include:

Lastly, Increasing the surface area of the reactants: as the surface area of the reactants increases, the number of reactant particles in contact with each other increases, making it more likely for them to collide and react.

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Answer:

the answer is 64 moths are dark

Answer: d

Explanation:because it makes sence i think

Answer:

Mole fraction of B is 0.76

Explanation:

The pressure of a mixture of gases using vapor pressure and mole fraction of each gas is:

P = P°aₓXa + P°bₓXb + ... + P°nₓXn

Where P is pressure of the system, P° is vapor pressure of pure gas and X is its mole fraction.

In the problem, the pressure of the mixture of two gases is 740torr, mol fraction of A is 0.24 and vapor pressure of B is 800torr, that is:

740torr =  P°aₓ0.24 + 800torrₓXb

Also, the sum of mole fractions for each of the compounds in the mixture is 1, that is:

1 = Xa + Xb

As Xa = 0.24

1 = 0.24 + Xb

1-0.24 = Xb

0.76 = Xb

Mole fraction of B is 0.76

go play mine craft use code wild ............................

The concentration of lead in the solution is 4.8 ppm.

The ppm (parts per million) is a unit used to express the concentration of a solution. It is defined as the number of parts (by mass) of a solute per million parts (by mass) of the solution. To convert from grams per 100 grams to ppm, we can use the following formula:

ppm = (mass of solute/mass of solution) x 10^6

In this case, the mass of solute (lead) is 0.00048 g, and the mass of solution is 100. g. Plugging these values into the formula, we get:

ppm = (0.00048/100) x 10^6

ppm = 4.8

Therefore, the concentration of lead in the solution is 4.8 ppm.

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Answer:

2.528x10⁻³M

Explanation:

Molarity is an unit of concentration used in chemistry. Is defined as the moles of solute per liter of solution.

To find the molarity of the solution we need to determine the moles of ammonium sulfate present in the initial 49.16mL solution and, with total volume, we can find the molarity, thus:

Moles ammonium sulfate:

49.16mL = 0.04916L * (0.0270 moles / L) =

1.327x10⁻³moles ammonium sulfate

These moles are present in 525.0mL = 0.525L. Thus, molarity of the solution will be:

1.327x10⁻³moles ammonium sulfate / 0.525L =

Answer:Ion-dipole

Explanation:

Answer:

How do amoeba respire.

how do plants respire.

The halogens are the elements of the 17th group of the periodic table, from the given choices, the elements that belong to this group are Fluorine and Chlorine.

When Liquid mercury (13.6 g/mL), kerosene (0.8 g/mL), and water (1.0 g/mL) are poured into the same container, the liquid Mercury will settle at the bottom

We know already that density is the mass per unit volume of substance. This is given as:

Density = mass / volume

We must recognize that we various liquids exist in the same container, the denser liquid will settle at the bottom.

With the above information in mind we can predict accurately what will happen when mercury, kerosene and water are pored into the same container. Details below:

From the above data, we can see that Mercury Has the highest density followed by water.

Thus, we can conclude that:

Mercury will settle at the bottom, followed by water and kerosine will be on top

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Answer:

1 s-orbital, 3 p-orbital and 5 d-orbital

Answer:

there are a total of nine orbitals in a third energy level

Explanation:

Air escape from a tire when tire valve is opened because the pressure from the weight of the car is forcing the already pressurized air out .

When air is filled in tires, it get into more compact area than the outer atmosphere, therefore particles in tire are close to each other and exert pressure continuously on tire walls to get out of it. Thus, material of the tire need to be pressure resistant as much possible.

After opening the tire valve, air starts leaving with huge sound as strain outside the tire is weaker than that inside the tire. Molecules strike with the same force on larger area and pressure starts diminishing.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: Air leaves a tire when the tire valve is opened because

A. the pressure outside the tire is lower than the pressure inside the tire.

B. the pressure outside the tire is greater than the pressure inside the tire.

C. the temperature is higher outside the tire than inside the tire.

D. there are more gas particles outside the tire than inside the tire.

Answer:

Half life = 13.197 hour

Explanation:

Given:

Old amount (A₀) = 3.2

New amount (A) = 0.4

Radiation decay time (t) = 39.6 hour

Half life = T(1/2)

Find:

Half life = T(1/2) = T

Computation:

A = A₀\(e^{-(\frac{0.693t}{T} )}\)

\(e^{-(\frac{0.693t}{T} )}\) = 0.4 / 3.2

-[27.4428 / T] = In (0.125)

-[27.4428 / T] = -2.0794

[27.4428 / T] = 2.0794

T = 13.197

Half life = 13.197 hour

Answer:bromine

Explanation:

Explanation:

its 399929939932929292