Lipid molecules are made of long chains of hydrogen and what other element?.

At 50 degrees Celsius, potassium chloride is soluble in 43.0 grammes per 100 grammes of water.

The solution to the issue gives you the solubility of potassium chloride, KCl, in water at 20°C, which is stated to be 34 g/100 g H2O. For every 100 g of water in a saturated potassium chloride solution at 20 °C, 34 g of dissolved salt will be present.

The solution to the issue gives you the solubility of potassium chloride, KCl, in water at 20°C, which is stated to be 34 g/100 g H2O.

The amount of a material that can dissolve completely in a solvent at a specific temperature is known as its solubility. A saturated solution is one such example. 

learn more about potassium chloride refer

https://brainly.com/question/25380525

#SPJ4

Answer:

200g/dm3

Explanation:

100cm3  needs to be converted into dm3

cm3 ⇒ dm3= ÷1000

\(\frac{100}{1000\\}\)= 0.1

To find the concentration we need to follow the formula:

C=\(\frac{m}{v\\}\)

C=\(\frac{200}{0.1}\)

C= 200g/dm3

Answer:

a molecule of an element is called atomicity

Answer:

density = 5 g/ml

Explanation:

D=m/v. Mass=30g and Volume=6mL

SO solve for D when m = 30 and v = 6

D=m/v

D = 30/6

density = 5 g/ml

Answer:

The correct option is a ball resting on the edge of a cliff.

Explanation:

A ball resting on the edge of a cliff is the correct option because it has the most potential energy and this is because potential energy is the energy stored by an object or energy posses by an object due it is position. It is the energy at rest.

A ball resting on the edge of a cliff indicate that the ball is a t rest, and it's possess energy base on its position relative to it's zero position.

Answer:A ball resting on the edge of a cliff.

Explanation:

The student failed to rinse a wet burette with a small amount of base before starting a titration. The student would need more titrant (base) to neutralize the acid than if they had rinsed the burette before starting the titration.

The reason for this is that when a wet burette is not rinsed with the titrant, the remaining water in the burette can dilute the titrant, thereby decreasing its concentration. If the titrant is diluted, more of it would be required to neutralize the same amount of acid. This would result in a titration that requires more titrant (base) to neutralize the acid than if the burette had been properly rinsed with the base.
In other words, not rinsing the burette with a small amount of base can affect the accuracy of the titration results. It is, therefore, important to properly rinse the burette with the titrant before starting a titration to avoid diluting the titrant and ensure accurate titration results.
In conclusion, more titrant (base) would be required to neutralize the acid if a wet burette is not rinsed with a small amount of base before starting a titration. It is essential to rinse the burette before starting a titration to avoid dilution of the titrant and ensure accurate titration results.

for more such question on titration

https://brainly.com/question/186765

#SPJ11

Answer:

Explanation:

NCl3 does not dissolve in water because it is a nonpolar molecule which is different with water. NCl3 is nonpolar due to the difference in electronegativities between 3 atoms of Cl and 1 atom if N2.

Answer:

A polar solute dissolves into a polar solvent and a non-polar compound dissolves into a non-polar solvent, this rule is known as "like dissolves like".

Compound that would have the highest boiling point is c) CH₃CH₂CH₂CH₂CH₂OH.

Pentan-1-ol (CH₃CH₂CH₂CH₂CH₂OH) is an alcohol with boiling point of 137⁰C.

While boiling, liquid pentan-1-ol is changed into gaseous pentan-1-ol.

Alcohols have higher boiling point than ethers, because it can form hydrogen bonds (see the picture below).

Between molecules of water there are hydrogen bonds, which must be brake so water can evaporate.

Hydrogen bond is an electrostatic attraction between two polar groups in which one group has hydrogen atom (H) and another group has highly electronegative atom such as nitrogen (like in this molecule), oxygen (O) or fluorine (F).

More about alcohol: brainly.com/question/9867663

#SPJ4

Using this formula, we can calculate the confidence interval once we have the sample data, without the sample data, it is not possible to provide an accurate confidence interval estimate.

To construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system, we would need the sample data, specifically the number of cell phone users and the number of users who developed cancer. Without the sample data, it is not possible to provide an accurate confidence interval estimate.

However, if we assume that we have the necessary sample data, we can proceed with the calculation. The formula for calculating a confidence interval for a proportion is:

Confidence interval

\(=�^±�×�^(1−�^)�Confidence interval= p^​ ±z× np^​ (1− p^​ )​ ​ where:�^p^​\)

 is the sample proportion (number of users with cancer divided by the total number of cell phone users).

\(�\)

z is the z-score corresponding to the desired confidence level (90% confidence level corresponds to a z-score of approximately 1.645).

\(�\)

n is the sample size (total number of cell phone users).

Using this formula, we can calculate the confidence interval once we have the sample data.

Learn more about confidence from below link

https://brainly.com/question/333719

#SPJ11

Answer:

29 grams

Explanation:

At 20°C, a saturated solution of sodium nitrate (NaNO3) contains 86 grams of solute in 100 m of water.

This means the solubility of NaNO3 at  20°C is 86 g/100 ml of water

The solubility of NaNO3 at 50 °C is 115 grams of NaNO3/100 ml of water.

Therefore; to get the amount of sodium nitrate must be added to saturate the solution at 50°C;

We subtract the solubility at 20°C  from the solubility at 50 °C

That is; 115 g/100 ml of water - 86 g/100 ml of water

         = 29 grams of NaNO3

On the basis of classification, electrolytic cells use non-spontaneous reactions which require an external power source in order to proceed.

On the other end, galvanic cells are spontaneous reaction, meaning it occurs with no outside intervention

A chemical change or reaction simply refers to a change which is not easily reversed and in which no new substance is formed.

So therefore, On the basis of classification, electrolytic cells use non-spontaneous reactions which require an external power source in order to proceed.

Learn more about chemical reactions:

https://brainly.com/question/11231920

#SPJ1

Answer:

0.182 moles of CO₂ are produced by this combustion

Explanation:

First of all, we state the combustion reaction:

C₃H₈  +  5O₂  → 3CO₂  +  4H₂O

As we do not have data from the oxygen, we assume it as the excess reactant. Let's determine the moles of propane, by the Ideal Gases Law.

We convert pressure from Pa to atm

67200 Pa . 1 atm /101300 Pa = 0.663 atm

P . V = n . R . T

0.633 atm . 2.33L = n . 0.082 . 297K

(0.633 atm . 2.33L) / (0.082 . 297K) = n

n = 0.0606  moles

Now we analyse the stoichiometry. Ratio is 1:3.

1 mol of propane can produce 3 moles of carbon dioxide

Then, 0.0606 moles of propane may produce (0.0606 . 3) /1 = 0.182 moles

In conclussion, 0.182 moles of CO₂ are produced by this combustion

Answer:

Altogether for both models; two red jellybeans, two white jellybeans, two black jellybeans and six blue jellybeans.

Note: Since no specific color was stated for oxygen atoms, the answer assigns blue colored jellybeans to represent oxygen atoms.J

Explanation:

Sodium bicarbonate, NaHCO₃ is a compound composed of one atom of sodium, one atom of hydrogen, one atom of carbon and three atoms of oxygen.

Since red jellybeans represent sodium atoms, white jellybeans represent hydrogen atoms, black jellybeans represent carbon atoms and blue jellybeans represent oxygen atoms, each of the two students will require the following number of each jellybean for their model of sodium carbonate: One red jellybean, one white jellybean, one black jellybean and three blue jellybeans.

Altogether for both models; two red jellybeans, two white jellybeans, two black jellybeans and six blue jellybeans.

Answer:

Topographic maps are an important tool because they can represent the three-dimensional landscape in two dimensions. A person who can read a topo map can find out the location of peaks, valleys, ridges and saddles, among other land features.

Explanation:

There are total three laws of newtons, first law of newtons, second law of newton and third law of newton. Therefore, for every action there is an equal and opposite reaction.

Newton's first law is also called law of inertia. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Third law of newton states  that for every action there is an equal and opposite reaction.

Therefore, for every action there is an equal and opposite reaction.

To know more about  newton's law, here:

https://brainly.com/question/29768600

#SPJ1

Answer:

iaiaiaiiaiaiaaiiaiaiaiaiaiia

Explanation:

babababbabahahahhahahahhahahahhahahahahahhahahahahahhahahhahahyayoenbshiwibbshhjjahjb bjkkoankokokkoekormkrokrkrk

The sizes of both the anode and the cathode change because the copper ions travel from the anode to the cathode. Therefore,  a solid copper appears directly beneath the anode. The number of copper ions remains the same so there is no color in the CuSO₄ solution.

Electrolytic refining can be described as a process of refining metal, especially copper by the process of electrolysis. During electrolysis,  impure metal is used as the anode and pure metal as the cathode.

The pure metal is formed at the cathode when the electrical current is applied by dissolving impure metal at the anode.

In copper refining, a block of impure copper is taken as an anode. CuSO₄   is used as a graphite-coated electrolyte along with pure copper, as a cathode. In electrolysis, CuSO₄ divides into a positive ion of copper (Cu²⁺) and sulfate (SO₄²⁻). The copper ion (Cu²⁺) travels made of pure copper where it absorbs the electrons from the cathode.

Learn more about electrorefining, here:

https://brainly.com/question/15124516

#SPJ2

The type of glass that has been exposed to high temperatures and shatters into tiny pebble-like fragments when it breaks is called tempered glass.

Tempered glass is a type of safety glass that has been treated with heat and chemicals to make it stronger and more durable than regular glass. When it breaks, it shatters into small, rounded fragments that are less likely to cause injury than the sharp shards produced by regular glass. Tempered glass is commonly used in applications where safety is a concern, such as car windows, shower doors, and storefront windows. It is also used in the construction of buildings, furniture, and appliances.

To know more about temperature

brainly.com/question/11464844

#SPJ4

Answer:

C) 10.2

Explanation:

Formula: Actual-Expected/Expected

The actual was 55.2 while the expected was 50.1

55.2-50.1/50.1=0.101796407 * 100= 10.2%

The percentage error in the student's determination is 10.2%

The correct answer to the question is Option C. 10.2

From the question given above, the following data were obtained:

Measured value = 55.2 °C

Accepted value = 50.1 °C

Next, we shall determine the absolute error. This can be obtained as follow:

Measured value = 55.2 °C

Accepted value = 50.1 °C

Absolute error = |Measured – Accepted|

Absolute error = |55.2 – 50.1|

Finally, we shall determine the percentage error.

Absolute error = 5.1 °C

Accepted value = 50.1 °C

\(Percentage error = \frac{Absolute error }{Accepted value} * 100\\\\= \frac{5.1}{50.1} * 100\\\\\)

Therefore, the percentage error in the student's determination is 10.2%.

The correct answer to the question is Option C. 10.2

Learn more: https://brainly.com/question/17441904

Answer:

idrk im sorry and iknow this didnt help bt im sorry

Explanation:

The action modeled by the diagram is; flow of ions ( cations and anions ) in a cell/compound

The diagram is used to represent the flow of control ( flow of ions ) in a system, it is similar to a data flow diagram, because the start, direction and endpoint of an activity diagram is the similar to that of a data flow diagram. Activity diagrams are also used to generally describe the steps in a use case system as seen in the diagram attached in the question.

Hence the diagram ( activity ) represents the flow of ions in a compound

learn more : https://brainly.com/question/16610518

Answer:

126 g of H₂O

Explanation:

Firstly, we complete the equation:

2H₂  +  O₂  →  2H₂O

If we have 7 moles of hydrogen, we assume, the oxygen is in excess.

Ratio is 2:2.

2 moles of hydrogen can produce 2 moles of water

Then, 7 moles of H₂ must produce 7 moles of water.

We convert moles to mass → 7 mol . 18 g/mol = 126 g

The optimum temperature for sucrase activity is 37 °C. The hydrolysis of sucrose is slowest at 0 °C.

The optimum temperature for sucrase activity is 37 °C, which means that the enzyme functions most efficiently at this temperature. As the temperature deviates from the optimum, the enzyme activity decreases. Therefore, the hydrolysis of sucrose would be slowest at a temperature that is significantly lower or higher than 37 °C.

Among the given choices, the temperature that is significantly lower than 37 °C is 0 °C (choice e). Enzyme activity is typically greatly reduced or completely halted at very low temperatures, as the enzyme molecules become less active or may even denature. Therefore, the hydrolysis of sucrose would be slowest at 0 °C.

To learn more about temperature

https://brainly.com/question/30033084

#SPJ11

Answer: the volume increases

Explanation: It increasses because the volume is how tall it is

The valence electrons are located in an atom's outermost energy level

In an atom, there are levels of energy in the shell and subshell  

This energy level is expressed in the form of electron configurations.  

Electrons fill the orbitals based on the Aufbau principle, namely the filling of electrons starts from the lowest energy level

Usually used in describing Lewis structures, placed around the element

Each orbital in an atom consists of 4 quantum numbers  : n, l, ml, ms

Each electron has a different quantum number and this conforms to Pauli's rule: no electrons have the same 4 quantum numbers

Valence electrons are electrons used in a chemical bond , and  in an atom's outermost energy level

Noble gas has a stable electron configuration of 8 valence electrons which guides the formation of chemical bonds called the octet rule

Prior to melting, both compounds were solids at first. Both samples were the same mass. The melting point of substance A is the same as that of substance B.

Two pure substance samples are heated continuously, and temperature is measured as a function of time. Melting point is the temperature at which a substance changes state from a solid to a liquid (or, less frequently, liquefaction point). At the melting point, there is an equilibrium between the solid and liquid phases. Chemicals that are produced by the chemical industry can be divided into three groups based on the volume of production: bulk chemicals, fine chemicals, and chemicals found. Prior to melting, both components were solids at first. Both samples were the same mass. The melting point of substance A is the same as that of substance B.

Learn more about compounds here

https://brainly.com/question/12166462

#SPJ4

Answer:

B.electrostatic repulsion by gold nuclei

Explanation:

According to Rutherford's experiment, a thin gold foil was bombarded with alpha particles. Some of the particles passed through the foil undeviated, some were scattered through large angles while some bounced backwards.

It follows that the particles that bounced backwards must have encountered a massive particle of like charge.

The atom is composed of a nucleus which contains positively charged particles. Some of the alpha particles which are positively charged particles bounced back when they encountered the positively charged particles in the nucleus.

Answer: The correct option is B (electrostatic repulsion by gold nuclei).

Explanation:

In the Rutherford's experiment, he used positively charged particles called alpha particles to bombard an atom in order to find out what is inside the atom. Together with two other scientists, Geiger and Marsden, they used a narrow beam of alpha particles emitted from a radioactive source to bombard a thin gold foil. The scattering of the particles from the gold foil was detected by a movable zinc sulphide screen which could be rotated to various positions around the foil.

Each time an alpha particle hit the screen, a visible flash of light or scintillation was produced. This was observed by a microscope attached to the screen. It was then observed that some of the particles followed a straight path through the gold foil while a few where scattered in a backward direction. This was as a result of electrostatic repulsion by gold nuclei which occurs due to the greater part of the mass of the atom was concentrated in a minute nucleus with positive charge.

So,

Given the following reaction:

We want to find the number of moles of water that can be produced from the reaction of 2.0 moles of hydrogen gas is reacted with 2.5 moles of oxygen gas.

First of all, we need to check which of both reactants is the limiting reactant because that reactant is going to generate the product.

To find the limiting reactant, we're going to use the coefficients of the reaction. The equation tells us that per each two moles of H2, one mol of O2 is needed to react. So,

We have 2 moles of H2, but we need 5 moles of H2 to react according to the reaction.

Since we have less amount of what we really need, then, H2 is the limiting reactant.

Now, the moles of water produced will be:

The answer is 2 moles of H2O.

Answer:

e< d< b< c=f< a

Explanation:

Quantum numbers refers to values that exactly describe the energy of electrons within an atom or a molecule. Electrons are known to possess a set of four quantum numbers used in describing the energy state of such electron. These quantum numbers are solutions to the Schrödinger wave equation for the hydrogen atom.

In describing any electron within the atom, the relevant set of four quantum numbers are: principal quantum number (n), orbital, azimuthal, subsidiary or angular momentum quantum number (l), magnetic quantum number (ml), and spin quantum number (ms).

In the arrangement above, the electrons are arranged in order of increasing energy. Each arrangement of quantum numbers corresponds to a particular energy state of the electron.

Answer:

they are very dangerous.

Explanation:

they cause disease in humans, animals, crops, and can cause permanent damage to immune systems.

Answer:

viruses can shut your immune system and infect blood cells thus killing you. vaccines will provent this by prepering your immune system so when you get said virus, it will reduce your chance of death

Explanation:

im not smart with health but i hope this is correct!

Answer:

6.02*1022

Explanation:

I don't know why