1. How many molecules are in 4.5 moles?

According to the forces of attraction freezing point and boiling point of water are different and are not related to  strength of electrostatic forces.

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

Explanation:

Combined Gas Law

T2= T1P2V2/ (P1V1) = 348.15 X .5 X 3.4/(2 X 7.5) =39.46 K or -233.69C

Answer:

a) polytetrafluorethylene

b) polyethylene terepthalate

c) Nickel

d) Polytetrafluroethylene

e) Aluminum

Explanation:

a) polytetrafluorethylene can be used to make laboratory bottles that can contain nitric acids ( dilute ones ) because of its resistance to either acidic or basic solution

b) polyethylene terepthalate can be used because it is relatively cheaper, also Benzene doesn't exhibit corrosion effect

c) Nickel can be used to produce pipes that transport hot alkaline solutions

d) Polytetrafluroethylene can be used for underground water tanks

e) Aluminum is used because it is light weighted and exhibits corrosion resistivity to climate change

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Phosphatidylserine is a type of phospholipid that is mainly found in cell membranes. Its structure is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule.

The fatty acid chains are hydrophobic, meaning they repel water, while the phosphate group and serine molecule are hydrophilic, meaning they attract water.

The glycerol molecule acts as a bridge that connects the two fatty acid chains to the phosphate group and serine molecule.
The structure of phosphatidylserine is important for its function in the cell membrane.

Because of the hydrophobic and hydrophilic components of its structure, phosphatidylserine is able to form a lipid bilayer, which is a barrier that separates the inside of the cell from the outside environment.

The hydrophilic heads of the phosphatidylserine molecules face outward and interact with water, while the hydrophobic tails face inward and repel water.
Phosphatidylserine also plays a role in cell signaling and apoptosis, which is programmed cell death.

It acts as a signaling molecule by binding to proteins that are involved in cellular pathways.

In addition, phosphatidylserine is translocated to the outer leaflet of the cell membrane during apoptosis, which signals to immune cells that the cell is ready to be removed.
In conclusion, the structure of phosphatidylserine is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule. Its hydrophobic and hydrophilic components allow it to form a lipid bilayer in cell membranes, and it also plays a role in cell signaling and apoptosis.

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Answer:

Gases are more difficult to measure than liquids, because measured volumes are highly affected by temperature and pressure. Gas meters measure a defined volume, regardless of the pressurized quantity or quality of the gas flowing through the meter.

Explanation:

It is difficult to measure the volume of agas because measured volumes are highly affected by temperature and pressure.

Answer:

HEIGHT IS 6cm and the base is 10 cm

Explanation:

Answer:

B. Combustion .

Explanation:

Hello.

In this case, since this reaction is started by pentyne and oxygen which are converted to carbon dioxide and water, we can infer this is a combustion reaction because it involves the burnt of a fuel, in this case the pentyne, by using oxygen in order to yield carbon dioxide and water, which are smaller molecules than the original pentyne.

It is important to notice that these reactions are very exothermic because they go to break the C-H bonds in the fuel which release a considerably high amount of energy.

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Explanation:

from chemical basics is the law of solution concentration which is no. of moles÷ volume

Answer:

pretty sure its B

Explanation:

Answer:

b :)

Explanation:

right on edge 2020

Answer:

i think it table broke in half

Explanation:

Answer: it would be change in water temperature

Explanation: because the change in the water is the temperature and its is

evaporation

The correct valence for ions of the following elements are:

Ca: 2+

Cl: 1-

O: 2-

Al: 3+

K: 1+

What is valence?

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Rounding to the appropriate number of significant figures, the equilibrium constant (Kc) for the reaction is approximately 1.66.

To calculate the equilibrium constant (Kc) for the given reaction, we can use the formula:

Kc = ([H2]^3 * [N2]) / [NH3]^2

Plugging in the given equilibrium concentrations, we have:

Kc = (0.470^3 * 0.800) / (0.250^2)

Calculating the numerator:

(0.470^3 * 0.800) = 0.1037032

Calculating the denominator:

(0.250^2) = 0.0625

Now, dividing the numerator by the denominator:

Kc = 0.1037032 / 0.0625 = 1.6592512

The equilibrium constant represents the ratio of the concentrations of products to reactants at equilibrium. In this case, the equilibrium constant is greater than 1, indicating that the products (H2 and N2) are favored at equilibrium. This means that the forward reaction is favored, leading to the formation of more products compared to reactants.The equilibrium constant value of 1.66 suggests that the forward reaction is moderately favored at equilibrium, but without additional context, it is difficult to determine the extent of the reaction or the relative concentrations of reactants and products at the beginning of the reaction.

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The physical and chemical properties of seawater vary according to latitude, depth, nearness to land, and input of fresh water. The physical and chemical properties of seawater have a great effect on organisms, varying especially with the size of the creature. Marine organisms have evolved a wide variety of unique physiological and morphological features that allow them to live in the sea.

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Answer:

1.875 gallons

Explanation:

At 25 degrees Celsius, with 50g of sugar, the solution will appear clear and homogeneous, with all the sugar dissolved. The ratio of dissolved sugar to undissolved sugar will be 50:0, as all the sugar has dissolved.

If an additional 55g of sugar is added to the 25-degree water, the solution will become supersaturated. This means that the water cannot dissolve all the sugar, resulting in the excess sugar remaining undissolved as solid particles at the bottom of the container. The solution will appear cloudy, and the ratio of dissolved sugar to undissolved sugar will be 50:5, as only 50g of the added sugar can dissolve.

When the solution is heated, the solubility of sugar increases. As a result, more sugar will dissolve, and the solution will become clear again. The ratio of dissolved sugar to undissolved sugar will approach 105:0 as the temperature increases and more sugar dissolves.

If the heated solution is slowly cooled back to 25 degrees Celsius, the solubility of sugar decreases. This will cause the excess sugar to come out of the solution and form solid crystals, which will be visible as sugar particles. The solution will appear cloudy again, and the ratio of dissolved sugar to undissolved sugar will depend on the amount of sugar that remains dissolved after cooling.

Adding a seed crystal to the mixture provides a surface for sugar crystals to form, resulting in the rapid crystallization of the remaining dissolved sugar. The solution will become saturated with sugar crystals, and the ratio of dissolved sugar to undissolved sugar will be close to 0:55, as most of the sugar will have crystallized. The solution will appear cloudy with a significant amount of sugar crystals present.

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Answer:

17.94 annd 27.69 respectively.

Explanation:

Na(s) + Cl(g) n` NaCl(s)

mass of NaCl = 45.6 g

Mr of NaCl = 23 + 35.5

= 58.5g/mol

mole of NaCl = mass/Mr

= 45.6/58.5

= 0.78 moles

From the equation;

1 mole of NaCl = 1 mole of Na = 1 mole of Cl

hence 0.78 mol of NaCl = 0.78 mol of Na = 0.78 mol of Cl.

mass of Na = 0.78 × 23

= 17.94 grams

mass of Cl = 0.78 × 35.5

= 27.69 grams

The mass of the sodium and chlorine gas taken for the reaction was  17.92 grams and 27.73 grams​ respectively.

Sodium chloride is an ionic compound in which the sodium (Na⁺) and chloride (Cl⁻) ions are present in a ratio of 1 : 1. It is commonly known as table salt or halite.

Sodium and chlorine react with each other to generate a substance that is familiar to everybody around the globe which is sodium chloride.

2Na (s)   +   Cl₂ (g)   \(\longrightarrow\)    2NaCl (s)

The atomic mass of the sodium (Na) = 23 g/mol

The atomic mass of chlorine,(Cl) = 35.5 g/mol

The molar mass of the sodium chloride (NaCl) = 58.5 g/mol

Given, the mass of the NaCl formed = 45.6 g

If 117 g NaCl formed from sodium = 2× 23 g

Then 45.6 NaCl will be formed from Na = 17.92 g

If 117 g NaCl formed from chlorine = 2× 35.5 g

45.6 NaCl will be formed from chlorine = 2× 35.5 ×45.7/117 = 27.73 g

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Answer:

C.) protons and neutrons

Explanation:

Most atoms contain proton(s), neutron(s), and electron(s). Within the nucleus of an atom, there are protons and neutrons. Electrons are located outside of the nucleus.

Answer:

heat production

Explanation:

Answer:

00 mg/kg/day given IV once daily

Explanation:

Answer:

4NH3(g) + 3O2(g) → 2N2(g) + 6H2O(g)

Explanation:

Answer:

Explanation:

The original volume of the gas can be found by using the formula for Boyle's law

\(V_1 = \frac{P_2V_2}{P_1} \\\)

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

From the question we have

\(V_1 = \frac{1.85 \times 12.5}{5.25} = \frac{23.125}{5.25} \\ = 4.4047619\)

We have the final answer as

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Camels lose less water through their urine and feces than many other mammals. Their kidneys concentrate water heavily, leading to salty urine. The intestines also reabsorb water from intestinal material as it is digested, so dry feces are produced.

Answer:

cannot be measure

Hope this helps :) !!!

In order to find the empirical formula of this compound, we need to find the number of moles of each element present in this molecule, we can do that by using the given information if the question, and the molar mass of each element:

90 grams of Carbon, molar mass = 12 grams/mol

11 grams of Hydrogen, molar mass = 1 gram/mol

35 grams of Nitrogen, molar mass = 14 grams/mol

Now let's start with Carbon:

12g = 1 mol

90g = x moles

x = 7.5 moles of Carbon in 90 grams

Hydrogen:

1g = 1 mol

11g = x moles

x = 11 moles of Hydrogen in 11 grams

Nitrogen:

14g = 1 mol

35g = x moles

x = 2.5 moles of Nitrogen in 35 grams

Now we have 7.5 moles of C, 11 moles of H and 2.5 moles of N, according to the rules on building the molecular formula of a compound, we can not use decimal numbers to build it, therefore we need to multiply all the values for 2

7.5 * 2 = 15 moles of Carbon

11 * 2 = 22 moles of Hydrogen

2.5 * 2 = 5 moles of Nitrogen

Now we have all the number in the integer form

To find the empirical formula, we need to divide all the values by the smallest value of moles:

15/5 = 3 moles

22/5 = 4.4 moles

5/5 = 1 mol

Therefore the final empirical formula is C3H4N

Answer:

Aerosol cans are pressurized, High temperatures increase the pressure in an aerosol can, potentially to the point of explosion.

The reaction time decreases as the temperature increases of the reaction mixture increases.

A sample record of results is:

An increase in temperature leads to an increase in reaction rate or a decrease in reaction time.

The increase in temperature provides more thermal energy to the reactant molecules, which leads to an increase in the average kinetic energy of the molecules. As a result, more reactant molecules have sufficient energy to overcome the activation energy barrier and undergo successful collisions, leading to an increased reaction rate.

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There is no reason to run these solutes at the 20 MWCO because they are both much smaller than the MWCO of the membrane.

The MWCO (molecular weight cut off) is the molecular weight of a solute at which it will be retained by a membrane during a process such as ultrafiltration or dialysis. If a solute has a molecular weight higher than the MWCO of a membrane, it will be retained and not pass through the membrane. If the molecular weight of a solute is lower than the MWCO, it will pass through the membrane.

In this case, glucose has a molecular weight of 180 g/mol (6 carbons x 12 g/mol per carbon + 6 oxygens x 16 g/mol per oxygen) and albumin has a molecular weight of approximately 81,942 g/mol (607 amino acids x 135 g/mol per amino acid). Both of these solutes have molecular weights that are much lower than 20,000 g/mol, which is a typical MWCO for ultrafiltration or dialysis membranes.

They would both easily pass through the membrane and be lost during the process. Instead, a membrane with a much lower MWCO would be needed if we wanted to retain these solutes during a process such as ultrafiltration or dialysis.

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