Which of the following best describes the structure of a nucleic acid?


a. Carbon ring(s)
b. Globular or fibrous
c. Single or double helix
d. Hydrocarbon(s)

Answer:

CA, AI, O

Explanation:

Look at a periodic table and locate each element. Note their electronegativity levels.

Answer:

write

threetypesofisomerismthatalkenescanexhibit?

Answer:

the arrow

Explanation:

this show reaction give product which always appear on right side

Answer:16km/hr

Explanation:

48km/3hr= 16km/hr

Answer:

16km/ hr

Explanation:

Answer:

8.90g

Explanation:

2×O=2×16.00=32.00g

mass=0.278×32.00g=8.90g

Answer: 682 grams

Explanation:

The balanced chemical reaction is:

\(4Fe+3O_2\rightarrow 2Fe_2O_3\)

\(O_2\) is the limiting reagent as it limits the formation of product and \(Fe\) is the excess reagent.

According to stoichiometry :

3 moles of \(O_2\) produce = 2 moles of \(Fe_2O_3\)

Thus 6.40 moles of \(O_2\) will produce=\(\frac{2}{3}\times 6.40=4.27moles\)  of \(Fe_2O_3\)

Mass of \(Fe_2O_3=moles\times {\text {Molar mass}}=4.27moles\times 159.69g/mol=682g\)

Thus 682 g of \(Fe_2O_3\) will be produced from 6.40 moles of oxygen

Answer: two solutions mixed in a beaker produce a solid

Explanation: it formed a new substance

The equilibrium constant at this temperature is Kc= 4.17 x 10⁻⁶.

Since the equilibrium constant depends on the equilibrium concentration of both the reactants and the products of the chemical reaction.

Balanced reaction equation

2CH₄(g)⇌C₂H₂(g)+3H₂(g)

The initial concentration of the CH₄ = 0.093 M

The equilibrium concentration of the H = 0.017 M

Equilibrium constant = ?

Let's make the ice table

2CH₄(g) ⇌ C₂H₂(g) + 3H₂(g)

0.093 M 0 0

-2x +x +3x

0.093-2x x 0.017 M

3x = 0.017 M

Therefore, x =0.017 M /3 = 0.00567 M

Therefore, the equilibrium concentration of CH₄ =

0.093 M – 2x = 0.093 M – (2 x 0.00567 M) = 0.0817 M

Equilibrium concentration of the C₂H₄ = x = 0.00567 M

Let's write the equilibrium constant expression

Kc= [C₂H₄[H2]³/[CH₄]²

Let's put the values in the formula

Kc= [0.00567][0.017]³/[0.0817]²

Kc= 4.17 x 10⁻⁶

Therefore, the equilibrium constant is 4.17 x 10⁻⁶.

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Answer:

1. Molecular equation

BaCl2(aq) + 2AgNO3(aq) –> 2AgCl(s) + Ba(NO3)2 (aq)

2. Complete Ionic equation

Ba²⁺(aq) + 2Cl¯(aq) + 2Ag⁺(aq) + 2NO3¯ (aq) —> 2AgCl(s) + Ba²⁺(aq) + 2NO3¯(aq)

3. Net ionic equation

Cl¯(aq) + Ag⁺(aq) —> AgCl(s)

Explanation:

1. Molecular equation:

BaCl2(aq) + AgNO3(aq) –> AgCl(s) + Ba(NO3)2 (aq)

The above equation can be balance as follow:

There are 2 atoms of Cl on the left side and 1 atom on the right side. It can be balance by putting 2 in front of AgCl as shown below:

BaCl2(aq) + AgNO3(aq) –> 2AgCl(s) + Ba(NO3)2 (aq)

There are 2 atoms of Ag on the right side and 1 atom on the left side. It can be balance by putting 2 in front of AgNO3 as shown below:

BaCl2(aq) + 2AgNO3(aq) –> 2AgCl(s) + Ba(NO3)2 (aq)

Now, the equation is balanced

2. Complete ionic equation

In solution, BaCl2 and AgNO3 will dissociate as follow:

BaCl2(aq) —> Ba²⁺(aq) + 2Cl¯(aq)

AgNO3(aq) —> Ag⁺(aq) + NO3¯ (aq)

BaCl2(aq) + AgNO3(aq) –>

Ba²⁺(aq) + 2Cl¯(aq) + 2Ag⁺(aq) + 2NO3¯ (aq) —> 2AgCl(s) + Ba²⁺(aq) + 2NO3¯

3. Net ionic equation

Ba²⁺(aq) + 2Cl¯(aq) + 2Ag⁺(aq) + 2NO3¯ (aq) —> 2AgCl(s) + Ba²⁺(aq) + 2NO3¯(aq)

Cancel out the spectator ions i.e ions that appears on both side of the equation in order to get the net ionic equation. This is illustrated below:

2Cl¯(aq) + 2Ag⁺(aq) —> 2AgCl(s)

Cl¯(aq) + Ag⁺(aq) —> AgCl(s)

1. Molecular equation: \(BaCl_2(aq) + 2 AgNO_3(aq) \rightarrow 2 AgCl(s) + Ba(NO_3)_2(aq)\)

2. Complete Ionic equation:\(Ba^{2+} (aq)+ 2Cl^- (aq) + 2 Ag^+ (aq) + 2NO_3^-(aq) \rightarrow2AgCl(s) + Ba^{2+}(aq) + 2 NO_3^-(aq)\)3. Net ionic equation: \(Cl^- (aq) + Ag^+ (aq) \rightarrow AgCl(s)\)

1. Molecular equation:

\(BaCl_2(aq) + AgNO_3(aq) \rightarrow AgCl(s) + Ba(NO_3)_2(aq)\)

There are two Cl atoms on the left side and one on the right. Balance can be achieved by adding 2 in front of AgCl, as seen below:

\(BaCl_2(aq) + 2AgNO_3(aq) \rightarrow AgCl(s) + Ba(NO_3)_2(aq)\)

There are two Ag atoms on the right side and one on the left. It is possible to achieve equilibrium by adding 2 in front of \(AgNO_3\), as demonstrated below:

\(BaCl_2(aq) + 2 AgNO_3(aq) \rightarrow 2 AgCl(s) + Ba(NO_3)_2(aq)\)

2. Complete ionic equation

\(BaCl_2\) and \(AgNO_3\) will dissociate in solution as follows:

\(BaCl_2(aq) \rightarrow Ba^{2+}(aq) + 2Cl^-(aq)\)

\(AgNO_3(aq) \rightarrow Ag^+ (aq) + NO_3^-(aq)\)

\(Ba^{2+} (aq)+ 2Cl^- (aq) + 2 Ag^+ (aq) + 2NO_3^-(aq) \rightarrow2AgCl(s) + Ba^{2+}(aq) + 2 NO_3^-(aq)\)

3. Net ionic equation

To obtain the net ionic equation, cancel out the spectator ions, which are ions that appear on both sides of the equation. As an example, consider the following:

\(2Cl^-(aq) + 2Ag^+(aq) \rightarrow 2AgCl(s)\)

\(Cl^-(aq) + Ag^+(aq) \rightarrow AgCl(s)\)

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Answer: b!

Explanation:

The purpose of this process is to reduce the risk of having outliers of false results.

It is important to bear in mind that a good scientific experiment usually tests one independent variable at a time, and that is why it is important to keep all other potential variables constant and to use a control group.

Although, the experiment you are referring to in your question is missing the general principle when conducting an experiment is the running of multiple tests before coming up with an actual test result.

Therefore, when completing a science experiment it is important to run multiple tests like heating the substance several times until a constant mass value is obtained,  in other to ascertain the results. the reason why such process is undertaken is to reduce the risk of having outliers of false results.  

A scientific experiment involves several procedures and this depends on the type and purpose of the experiment.

for example ;

An experiment with the purpose of determining how the mass of an object reacts to heat will require the mass of the object to be recorded  after heating the object/substance several times.

Hence we can conclude that the purpose of the process is to reduce the risk of having outliers of false results.

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Answer:

Preventing erosion – Land Reclamation

Protecting nesting areas – Protecting Biodiversity

Preventing littering – Land Reclamation

Preventing habitat disruption – Protecting Biodiversity

Protecting native species – Protecting Biodiversity

Preventing contamination of soil – Land Reclamation

Explanation:

I really hope I'm right! I tried my hardest, please give me brainliest :)

have a good day!

The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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When sodium metal and hydrochloric acid combine, salt and hydrogen gas are produced. As a result, sodium metal and hydrochloric acid will be your reactants since these are the things that undergo transformation to produce salt and hydrogen gas.

In a chemical reaction, one or more substances—also known as reactants—are changed into one or more additional substances—also known as products. Chemical components or chemical compounds make up substances.

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Answer:

solar flair I think I'm not sure

Answer:

c the available food supply

Answer:

88.9%

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

2AlCl3(aq) + 3H2SO4(aq) —> Al2(SO4)3(aq) + 6HCl(aq)

Step 2:

Determination of the masses of AlCl3 and H2SO4 that reacted and the mass of Al2(SO4)3 produced from the balanced equation.

Molar mass of AlCl3 = 27 + (35.5x3) = 133.5g/mol

Mass of AlCl3 from the balanced equation = 2 x 133.5 = 267g

Molar mass of H2SO4 = (2x1) + 32 + (16x4) = 98g/mol

Mass of H2SO4 from the balanced equation = 3 x 98 = 294g

Molar mass of Al2(SO4)3 = (27x2) + 3[32 + (16x4)]

= 54 + 3[32 + 64]

= 54 + 3[96] = 342g/mol

Mass of Al2(SO4)3 from the balanced equation = 1 x 342 = 342g

Summary:

From the balanced equation above,

267g of AlCl3 reacted with 294g of H2SO4 to produce 342g of Al2(SO4)3.

Step 3:

Determination of the limiting reactant. This is illustrated below:

From the balanced equation above,

267g of AlCl3 reacted with 294g of H2SO4.

Therefore, 25g of AlCl3 will react with = (25 x 294)/267 = 27.53g of H2SO4.

From the calculations made above, we see that only 27.53g out 30g of H2SO4 given were needed to react completely with 25g of AlCl3.

Therefore, AlCl3 is the limiting reactant and H2SO4 is the excess.

Step 4:

Determination of the theoretical yield of Al2(SO4)3.

In this case we shall be using the limiting reactant because it will produce the maximum yield of Al2(SO4)3 since all of it is used up in the reaction.

The limiting reactant is AlCl3 and the theoretical yield of Al2(SO4)3 can be obtained as follow:

From the balanced equation above,

267g of AlCl3 reacted to produce 342g of Al2(SO4)3.

Therefore, 25g of AlCl3 will react to produce = (25 x 342) /267 = 32.02g of Al2(SO4)3.

Therefore, the theoretical yield of Al2(SO4)3 is 32.02g

Step 5:

Determination of the percentage yield of Al2(SO4)3.

This can be obtained as follow:

Actual yield of Al2(SO4)3 = 28.46g

Theoretical yield of Al2(SO4)3 = 32.02g

Percentage yield of Al2(SO4)3 =..?

Percentage yield = Actual yield /Theoretical yield x 100

Percentage yield = 28.46/32.02 x 100

Percentage yield = 88.9%

Therefore, the percentage yield of Al2(SO4)3 is 88.9%

Answer:

The final temperature is 181.92°C

Explanation:

Given

Initial Temperature, T1 = 0°C

Initial Volume, V1 = 555mL

Initial Pressure, P1 = 80.0kPa

Final Volume, V2 = 1880ml

Final Pressure, P2 = 39kPa

Required

Determine the Final Temperature, T1

This question illustrates ideal gas law and will be solved using:

(P1 * V1)/T1 = (P2 * V2)/T2

But first, we need to convert temperature to degree Kelvin

T1 = 0°C = 273 + 0 = 273k

Next, we substitute values for P1, V1, T1, P2 and V2

THE EQUATION BEFOMES

(80 * 550)/273 = (1880 * 39)/T2

44000/273 = 73320/T2

Cross Multiply

44000 * T2 = 73320 * 273

44000T2 = 20016360

Solve for T2

T2 = 20016360/44000

T2 = 454.92K

Convert to degree Celsius

T2 = 454.92 - 273

T2 = 181.92°C

Hence, the final temperature is 181.92°C

The ideal gas law, also called the general gas equation, is the equation of the state of a hypothetical ideal gas.

The ideal gas law work under the constant:-

Hence the formula we gonna use is as follows:-

\(PV = nRT\)

In the question, the pressure, temperature, and volume are given in two different system

Hence it is equal to

\(\frac{PV}{T} = \frac{PV}{T}\)

Put the value given,

\(\frac{80*50}{273} = \frac{1880*39}{T}\)

Solving the equation, the value T will be:-

\(T2 = \frac{20016360}{44000}\)

=181.92C

The temperature given is 181.92C

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Answer:

fusion in the sun

Explanation:

I know this because I am currently talking this test and I know it cause I did it

Answer:Turning on a ceiling fan: electrical to mechanical

I took the test and Fusion in the sun: chemical to light and heat Lighting a match: sound energy into chemical energy were the wrong answers.

Yes the all types of the consumers are the heterotrophs.

The consumers play a very important role in the ecosystem of the earth by maintaining the population and growth to the organism of the ecosystem. If we remove the consumer or either the producer then the whole system of the ecosystem will be destabilize, and thus the ecosystem can survive from the overpopulation problem and lack of food problem. The other organism can transfer energy to the consumer.

Both the primary (herbivores) and as well as the secondary (carnivores and omnivores) consumers are heterotrophs.

So we can conclude that yes the all types of the consumers are the heterotrophs.

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Image 1

1) There is more proton repulsion in Uranium than in Barium

2) Barium experiences a stronger force holding the nucleons together

3) The repulsion of the neutrons in Uranium makes the nuclide unstable

4) The higher the atomic number, the more likely that the nucleus is radioactive.

5) U-238 has 146 neutrons

6) U - 235 has 143 neutrons

Image 2;

1) You can minimize background radiation by limiting your outdoor exposure.

2) Cosmic radiation is the most difficult to avoid.

The natural radiation that is constantly present in the environment is known as background radiation.

It includes internal radiation found in all living things as well as cosmic radiation, which originates from the sun and stars and terrestrial radiation, which originates from the Earth.

We know that the repulsion of the protons in the Uranium nucleus is more than that of the barium nucleus because there are more neutrons in the Uranium nucleus. It is this repulsion that makes Uranium unstable.

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Answer:

compounds

Explanation:

It is a substance formed when two or more. When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.

Answer:

Brain big big brain

Explanation:

Biggest brain small brain Big brain big stonks

Answer:

[See Below]

Explanation:

✦ Physical Changes:

  ✧ Is when the form changes, but not the chemicals in that form.

  ✧ An example of this would be chopping wood. It's still wood but it's a different size now. It's easier to burn it since it's smaller.

✦ Chemical Changes:

  ✧ Is when the chemicals inside that form change to something else entirely

  ✧ An example would be an egg, when you cook the egg it can turn into being scrambled or fried. But you can't eat the raw egg until the chemicals change.

~Hope this helps Mate. If you need anything feel free to message me.

Answer:

Here is an example of the full report for this type of lab. Includes data table etc. I would suggest making some changes on wording prior to submission

Explanation:

Answer:

the jar is powerful for people to hear thing because if a phone ring it would be loud to hear

Explanation:

The first four periods compared to the group containing nitrogen Group 15 elements have half-filled p orbitals.

A basic part of a whole. In chemistry, refers to a simple substance that cannot be broken down into smaller parts or changed into another substance. The basic part of an element is an atom, which contains protons, neutrons, and electrons. All atoms of an element have the same number of protons.

The elements are classified as metal, non-metal, and metalloid. The extreme left side elements in the periodic table are metals, for example, sodium, calcium, caesium, etc. However, elements on the right side are generally referred to as non-metals, carbon, chlorine, oxygen, etc.

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Answer:

Atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. In a covalent bond, two atoms share one or more electrons.

The equation that is going to show the loss of the third electron from the copper at is;

Cu(s) ----> Cu^3+ + 3e

Ionization energy is the amount of energy required to remove an electron from an atom or a positively charged ion in its gaseous state. It is also known as ionization potential or ionization enthalpy.

The ionization energy of an atom varies based on its position in the periodic table, and it generally increases from left to right across a period and decreases down a group.

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From the Herszsprung -Russel Diagram presented it is to be noted that if a star has an absolute magnitude of 10 and a temperature of 20,000 K, the spectral class under which the star would be classified is; O-Types. (Option B).

These stars have a blue-white appearance and are characterized by strong emission lines in their spectra, which are caused by the high temperatures in their atmospheres.

The absolute magnitude of a star is not directly related to its spectral class, but it can be used to estimate the distance of a star from Earth. A star with an absolute magnitude of 10 would be relatively faint if it were close to Earth, but it could be much brighter if it were farther away.

Hence, if a star has an absolute magnitude of 10 and a temperature of 20,000 K, it would be classified as an O-type star.

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