Please help me I need these answers

The molarity of the solution is 0.023 M and the molality of the solution is  17.9 m.

The concentration of a solution is defined as the amount of substance in a solution. Now we are told that we have a solution of  2.64 L aqueous solution of KOH. The solution has a density of 1.29 g/mL.

Density of the solution = 1.29 g/mL

Volume of the solution =  2.64 L

mass of the solution = 1.29 g/mL * 2.64 L = 3.4 g

Number of moles of the solute =  3.4 g/56 g/mol = 0.061 moles

Molarity =  0.061 moles/2.64 L = 0.023 M

Molality of the solution = 0.061 moles/3.4 * 10^-3 Kg = 17.9 m

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Since she suspects that the substance is cocsine, the thing that she should do next is option 1-Perform a confirmatory test.

The way that Drug evidence is collected is that from any crime scene, evidence is obtained, photographed, packaged, documented as well as been sent for analysis and then the forensic scientist will carry out the Analysis.

Since the evidence has been sent to Roshni, all she has to do is to carry out the confirmatory test to see if the drug is what she suspected.

Therefore, Since she suspects that the substance is cocsine, the thing that she should do next is option 1-Perform a confirmatory test.

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Answer:

CH3COOH + OH- ----> CH3COO- + H2O

Answer:

I don't understand snap the equation and send it

Answer:

18g6.02×1023molecules=500gx. 18 g 6.02 × 10 23 molecules = 500 g x .

Explanation:

1) The mass of the object is 18 g

2) The correct relationship is option C

Density is the ratio of the mass to the volume of a body. We know that the density of the body is an intrinsic property. This implies that it does not change with the amount of substance or with the mass of the body. Let us now try to solve each of the problems.

1) Density = mass/volume

Volume = 1 cm * 3 m * 2 cm = 6 cm^3

Density of the body = 3 g/cm^3

Mass of the body = 6 cm^3 * 3 g/cm^3 = 18 g

2) To answer question 2, we have to remind ourselves of what we said that the density is the ratio of the mass to the volume of a body and that the density of a body is constant. This implies that the relationship that defines the relationship of the mass to the density of the material does not change and this is shown by option C.

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Answer:

Physical change

Explanation:

Because there may be or may not be change in state,shape size.When water is heated it come to a state of vapour

2 hour 30 minute it take to deliver all of the solution

Normal saline is a cornerstone of intravenous solutions commonly used in the clinical setting IV saline to replenish lost fluids, flush wounds, deliver medications, and sustain patients through surgery, dialysis, and chemotherapy and saline IV have even found a place outside the hospital, as a trendy hangover remedy

Here given data is IV saline solution deliver = 2.00 L and drop factor = 60.0 gtt/mL and drip rate = 115.0 gtt/min.

We have to calculate hours = ?

So for calculating hours

Time = volume × drip rate

Time = 2.00 L ×  115.0 gtt/min

Time = 230 means 2hours 30 minute

2 hours 30 minute will it take to deliver all of the solution

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The number of each type of particle is:

The number of protons is 11

The number of neutrons is 12

The number of electrons is 10

A proton is a stable subatomic particle with the symbols p, H+, or 1H+ and an electric charge of +1 e. Its mass is 1836 times greater than that of an electron and only slightly less than that of a neutron. Every atom's nucleus contains one or more protons. The defining characteristic of an element is its atomic number, which is the number of protons in its nucleus (represented by the symbol Z).

The neutron, symbol n or n0, is a subatomic particle with a neutral charge and slightly more mass than a proton. Atomic nuclei consist of protons and neutrons. With the exception of the hydrogen nucleus, which has a single proton, neutrons are necessary for the stability of nuclei. Nuclear fission and fusion generate a ton of neutrons.

For a neutral Na, Sodium atom:

The mass number P+N = 23

Atomic number (E or P) = 11

A charged Na atom that has lost an electron is positively charged and so:  Number of Protons = 11 (Still the same)

Number of neutrons = 12

Number of electrons = 11-1=10 (the atom has lost an electron)

If an atom loses an electron, it becomes positively charged ie. P>E

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The four states or phases of matter are:

Liquid: This state or phase of matter has no definite shape. It takes the shape of the container.

Solid: Solid has a definite volume and shape

Gas: Neither a definite shape nor volume.

Plasma: No fixed shape or volume.

Matter can simply be defined as anything that has mass and occupies space. There are four major States or phases of matter. These are: Solid, liquid, gas and plasma.

So therefore, the four states or phases of matter are:

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The percent by mass of oxygen in H₄P₂O₇ is 62.92%.

The percentage by mass of an element in a compound can be calculated by dividing the atomic mass of the element by the molar mass of the compound multiplied by 100 as follows:

% by mass = atomic mass of O/molar mass of H₄P₂O₇ × 100

The molar mass of H₄P₂O₇ can be calculated as follows:

1(4) + 31(2) + 16(7) = 178g/mol

Percent by mass of oxygen = (112g/mol ÷ 178g/mol) × 100

Percent by mass of oxygen = 62.92%

Therefore, 62.92% is the percent by mass of oxygen.

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This nuclear reaction would give Boron - 14 as the product.

A beta emission has to do with the transformation of a proton to electron. This occurs with the change in the atomic number of the element. In this case, the parent nucleus that undergoes decay is carbon - 14.

The daughters nucleus will have the same mass number but a different atomic number. Let us now see the product of this reaction.

From the equation shown, this nuclear reaction would give Boron - 14 as the product.

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Answer:

Dehydration synthesis involves the formation of new chemical bonds between two molecules which leads to the formation of new compounds. A reaction occurs with the loss of water molecules at each step.

The aluminum ion, Al3+, is produced when an aluminum atom loses three electrons, and the magnesium ion, Mg2+, is produced when a magnesium atom loses two electrons. Atoms of elements that lose electrons gain a positive charge.

The three valence electrons in aluminum are lost, forming a cation with a positive charge of three: These cations have names that correspond to the metals that they are made of the octet rule is not always followed by transition elements and the metals to their right; frequently, they create more than one cation. Ionization is the process by which ions are created when an atom or molecule gains or loses an electron.

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Answer:

Cyclooctyne (C8H12) is the smallest cycloalkyne capable of being isolated and stored as a stable compound

Explanation:

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The final temperature of the canister is 312.76 degrees celsius.

The relation between temperature and pressure is given by the Gay Lusaac’s Law.

According to this law at constant volume, pressure is directly proportional to the temperature.

Mathematically it is as follows,

Pressure (P) ∝ Temperature(T)

P = K T

P/T = K(constant)

Thus the ratio of P/T will remain the same if volume remains constant.

So, P1/T1 = P2/T2

Here P1= initial pressure of the canister = 97.2 kPa = 0.95 atm

P2 = Final pressure of the canister = 1.88 atm

T1 = Initial temperature = 23 c = 296 K

T2 = Final temperature = ?

Putting these values

0.95/296 = 1.88/T2

T2 = 585.76 K or 312.6°C.

Thus, the final temperature of the canister is 312.76 degrees celsius.

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Answer:

No

Explanation:

They are bonded on a molecular level and a chemical process must be used to separate

Answer:The branch pf science that Mary works in is botany because botany is the study of plants.

Number of moles of N in 0.207 g of N₂O= 0.0094

We are starting with 0.207g of N₂O in this instance. Let's use the molar mass, which is 44.013 g/mol, to convert that to moles.

(1 mol N₂O / 44.013 g N₂O) x 0.207 g

⇒ 0.00470 mol N₂O.

Having reached moles of nitrogen monoxide, we must now determine how many moles of nitrogen there are. We can see that there is a subscript of 2, indicating that there are two moles of nitrogen for every mol of nitrogen dioxide. You might think of it in terms of food; there are two pieces of bread for every sandwich.

In order to obtain moles of N, let's multiply the amount of moles of N₂O by 2.

(2 mol N / 1 mol N₂O )x 0.00470 mol N₂O = 0.0094 mol N.

Hence, Number of moles of N in 0.207 g of N₂O will be 0.0094.

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The density of the object is 4.4 g/mL.

The term density refers the ratio of the mass of the mass to the volume of a body. The density of a body is a constant as it does not change irrespective of the mass or the volume of the object in at any given time. We have now been told that the former volume of the water was 21.27 mL. The addition of the object increased the volume of the object to about 24.78 mL.

Let us recall that is common to obtain the volume of a solid by the displacement method. The volume of the substance before and after the addition of the solid is recorded. The volume of the solid is taken to be the volume of the liquid that is displaced since the solid must displace its own volume of liquid.

Hence we have;

Mass = 15.45 g

Volume = 24.78 mL -  21.27 mL = 3.51 mL

Density =  15.45 g/3.51 mL

= 4.4 g/mL

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Answer:

neutrons = 71

protons = 6

electrons = 6

Explanation:

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Answer:

The position of their eyes

Explanation:

See, the dog is able to see the object more than the rabbit can is because of the position of their eyes.

The dogs eyes are positioned in the front like our eyes making the dog have a stereoscopic vision (180 degree field of view)

With rabbits though, they can't really see what's in front of them because their eyes are on the side hence the dog can see the object more than the rabbit can.

Answer:

47.5 millimeters

Explanation:

The gas inside the bubbles that form in the boiling water is H₂O(g).

The gas inside the bubbles that form in the boiling water is mostly water vapor. The bubbles in the water vapor start to form on nucleation sites. The water vapor bubbles start to form larger as the temperature increases because more liquid is being converted to gaseous form. Vapor-filled bubbles shrink and disappear completely.

Therefore, when water is boiling the physical state of water, liquid changes to another state of water which is gaseous.

Hence, the bubble that we see in boiling water is the gaseous form H₂O(g) of water.

The boiling water is the vaporous form H₂O(g) of boiling water.

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4.5g of mass of mercury contains the same number of atoms as 90.15g of helium.

With the atomic number 80 and the symbol Hg, mercury is a chemical element. Formerly known as hydrargyrum, which is a combination of the Greek terms hydor (water) and argyros), it is also known as quicksilver (silver). The only other element that is known to be liquid under these conditions is the halogen bromine, however metals like caesium, gallium, and rubidium melt just above ambient temperature. Mercury is a heavy, silvery d-block element.

All around the world, deposits of mercury, primarily in the form of cinnabar, are found (mercuric sulfide). Cinnabar, either natural or manufactured mercuric sulfide, is ground to create the crimson pigment vermilion.

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Answer:

I think It's the 2nd "There are two compounds present"

2.01214904 × 10²² silver atoms are there in 3.74 g of silver

The most common isotope of silver has 60 neutrons, 47 protons, and 47 electrons. Silver is a soft metal with a glossy metallic luster under normal circumstances. It is exceedingly malleable and ductile (can be formed into a wire).

The molar mass of silver is as follows:

Molar mass of Ag = 107.8682 g/mol

The number of atoms in a molar mass is Avogadro’s number:

6.022140857 × 10²³

Therefore 3.8 g of silver contains 3.8 times 6.022140857 × 10²³ divided by 107.8682 that equals 0.03522818 times

6.022140857 × 10²³

= 2.01214904 × 10²² atoms.

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The solubility of the compound is obtained as 9.5 * 10^-14 M.

The solubility product refers to the equilibrium constant that shows the extent to which a thing is soluble in water, Now we can write the solubility product as;

Ksp = [Hg^2+] [2OH^-]^2

Let  [Hg^2+]  =  [OH^-] = x

Then I can write;

Ksp = x * (2x)^2

Ksp = 4x^3

When x = solubility

x = ∛Ksp/4

Ksp =  3.60×10^−26

x =  ∛ 3.60×10^−26/4

x = 9.5 * 10^-14 M

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