pleaseee helpppp


A chemist measures the enthalpy change AH during the following reaction:

2 Na(s) + Cl2(9)-2 NaCl(s)

AH=-822. kJ

Use this information to complete the table below. Round each of your answers to the nearest kJ/mol.

​

Answer:

D

Explanation:

WOOOOOO

The statement which best compares DNA and RNA with regard to the process of protein production is that RNA leaves the nucleus during the process and DNA remains in the nucleus.

DNA is a hereditary material which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus  and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate  sugar are together called as nucleotides.

Learn more about DNA,here:

https://brainly.com/question/31098

#SPJ6

Answer:

Qura'an is what makes my day, I read it every morning and it makes me relaxed. I love reading the Qura'an. Do dua for me because I hope I am gonna memorize it after I finish reading it with tajweed.

Explanation:

Answer:

:)

Explanation:

Quran is something that makes you feel relax.

Answer:

book on a table

Explanation:

potential energy is stored energy

also mark brainliest

Answer:

A child Swinging on a play

Explanation:

Because The potential Energy is about doing something The Defference about Kinetic Energy are A Things That not move before you moved it

Answer:

i think your answer is carbon because it has 6 neutrons and electron is also 6

Answer:

B

Explanation:

Two quick google searches later I grace you with the google has bestowed upon me

The question is missing. Here is the complete question.

One light beam has wavelength, [tex]\lambda_{1}[/tex], and frequency, f₁. Another light beam has wavelength, [tex]\lambda_{2}[/tex], and frequency, f₂. Write a proportion that shows how the ratio of the wavelengths of these two light beams is related to the ratio of the frequencies.

Answer: [tex]\frac{f_{1}}{f_{2}} =\frac{\lambda_{2}}{\lambda_{1}}[/tex]

Explanation: In vacuum, eletromagnetic waves travels at a constant speed called "speed of light", whose symbol is [c] and magnitude is 3x10⁸m/s.

Speed of light, frequency and wavelength are related by the formula:

[tex]c=\lambda.f[/tex]

So, if one light beam has wavelength and frequency, [tex]\lambda_{1}[/tex] and f₁, respectively, the second beam has wavelength [tex]\lambda_{2}[/tex] and frequency f₂ and both travel at speed of light:

[tex]\lambda_{1}f_{1}=\lambda_{2}f_{2}[/tex]

[tex]\frac{f_{1}}{f_{2}}=\frac{\lambda_{2}}{\lambda_{1}}[/tex]

Then, the ratio that shows the relation between frequencies and wavelengths of these light beams is [tex]\frac{f_{1}}{f_{2}}=\frac{\lambda_{2}}{\lambda_{1}}[/tex]

Answer:

alleles

Explanation:

Answer:

The answer is alpha, beta, and gamma

Explanation:

I took this quiz, and that answer was correct.

(Good luck on primavera my G)

Answer:

D

Explanation:

Bases have a bitter taste, slippery when touched and they can form hydronium ions. (they can conduct electricity.)

The answer is  C.) Evidence

Answer:

Explanation:

I think 480. It should be able to give off more than it has and some of that energy is transferred.

Answer:

The answer is B!

Explanation:

if they are lower this means that they have been on the ground longer there for older

The statement that is true about fossils is that fossils  found in lower layers of sedimentary rock are older than fossils found in upper layers of sedimentary rock.

They are the types of rocks which are formed as a result of accumulation of minerals or organic particles at the surface of the earth.Sedimentation is the name given to a collective process which cause the particles to settle.

The study of sedimentary rocks is useful in civil engineering and as important sources of coal, fossil fuels and ores.The color of sedimentary rock is often determined by iron content and sometimes due to the presence of organic matter.

They are classified based on origin in to 4 types which are clastic, biochemical ,chemical and other sedimentary rocks.While based on composition they are classified as siliciclastic,carbonate ,evaporite,organic rich,siliceous ,iron-rich and phosphatic sedimentary rocks.

Learn more about sedimentary rocks,here:

https://brainly.com/question/10709497

#SPJ3

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\ [/tex]

From the question we have

[tex]volume = \frac{26.4}{1.59} \\ = 16.60377...[/tex]

We have the final answer as

Hope this helps you

Answer:

i can help i think depends on the question! :)

Answer:

Metallic compound

Explanation:

Metallic compound -

A metallic compound refers to the species having at least one metal, is known  as a metallic compound.

In general a metallic compound consists of two ions, a positive ion or the cation, is is basically a metal, and,

a negative ion or an anion, which is a non - metal.

Hence, from the given statement of the question,

The correct answer is - metallic compound.  

Answer:

it is b

Explanation:

Becuase CO2(g) is the right answer bc i said so ok if u think im wrong ask your mom of if u say im dum im not im a teacher ok bye

Answer:

[tex]322014\ \text{J}[/tex]

Explanation:

m = Mass of water = 1 kg

c = Specific heat of water = [tex]4182\ \text{J/kg}^{\circ}\text{C}[/tex]

[tex]\Delta T[/tex] = Change in temperature = [tex](99-22)^{\circ}\text{C}[/tex]

Heat or energy required in the system is

[tex]Q=mc\Delta T\\\Rightarrow Q=1\times 4182\times (99-22)\\\Rightarrow Q=322014\ \text{J}[/tex]

The energy required is [tex]322014\ \text{J}[/tex]

Unit of energy is Joule

[tex]mc\Delta T=\text{kg}\times \dfrac{\text{J}}{\text{kg}^{\circ}\text{C}}\times\ ^{\circ}\text{C}=\text{J}[/tex]

As heat is being absorbed by the water it is endothermic in nature.

Aluminium alloys are used because they are light, relatively strong and inexpensive. Aluminum on its own is very soft and weak. However add about .24% copper and it becomes heat treatable and the 2024 alloy also age hardens. This works well for the skin of the aircraft. Rivets made from the 2117 alloy (.17% copper) work harden. This means they become hard as they are installed, resulting in a strong, durable structure. However aluminum alloys do have their limitations, and repeated cabin pressurization cycles can result in fatigue and cracking. These are normally found and repaired during the various aircraft letter checks.

HOPE IT HELPS YOU OUT PLEASE MARK IT AS BRAINLIEST AND FOLLOW ME PROMISE YOU TO FOLLOW BACK ON BRAINLY.IN

Answer:

4) Aluminum Oxide

Explanation:

Answer:

Aluminum Oxide

Explanation:

:)

Answer:

A. water evaporating. it must be there.

Answer:

Using glucose to provide energy for the body

Explanation:

Answer:

Explanation: When solutions of potassium iodide and lead nitrate are combined?

The lead nitrate solution contains particles (ions) of lead, and the potassium iodide solution contains particles of iodide. When the solutions mix, the lead particles and iodide particles combine and create two new compounds, a yellow solid called lead iodide and a white solid called potassium nitrate. Chemical Equation Balancer Pb(NO3)2 + KI = KNO3 + PbI2. Potassium iodide and lead(II) nitrate are combined and undergo a double replacement reaction. Potassium iodide reacts with lead(II) nitrate and produces lead(II) iodide and potassium nitrate. Potassium nitrate is water soluble. The reaction is an example of a metathesis reaction, which involves the exchange of ions between the Pb(NO3)2 and KI. The Pb+2 ends up going after the I- resulting in the formation of PbI2, and the K+ ends up combining with the NO3- forming KNO3. NO3- All nitrates are soluble. ... (Many acid phosphates are soluble.)

The net ionic equation for the reaction that occurs when solutions of lead(II) nitrate and potassium iodide are combined in a test tube is:

Pb²⁺(aq) + 2 I⁻(aq) ⇒ PbI₂(s)

Solutions of lead(II) nitrate and potassium iodide were combined in a test tube. This is a double displacement reaction. The complete ionic equation is:

Pb²⁺(aq) + 2 NO₃⁻(aq) + 2 K⁺(aq) + 2 I⁻(aq) ⇒ 2 K⁺(aq) + 2 NO₃⁻(aq) + PbI₂(s)

Spectator ions are those that appear both in the reactants and in the products. They do not participate in the reaction, so they do not appear in the net ionic equation. The net ionic equation is:

Pb²⁺(aq) + 2 I⁻(aq) ⇒ PbI₂(s)

The net ionic equation for the reaction that occurs when solutions of lead(II) nitrate and potassium iodide are combined in a test tube is:

Pb²⁺(aq) + 2 I⁻(aq) ⇒ PbI₂(s)

Learn more: https://brainly.com/question/21883718

Answer:

There are 4 subshells, s, p, d, and f. Each subshell can hold a different number of electrons. The n number determines how many of the subshells make up the shell. For example, the 1st shell is made up of 1 subshell, s.

Explanation:

hope this helps...

Answer:

i wasn't getting what your question is so this is it

The number of proton will be 15 and number of electron will be 18.

In the nuclei of atoms, the proton is just a basic electrically charged particle with neutrons. The p symbol is used to represent it.

The electron is just a subatomic particle with a negative electric charge. It will find  easily in the surrounding nucleus. They are assumed to be elementary particles.

Calculation of number of proton and number of neutron shown below:

It is given that the atomic number of phosphorus is 15 . After adding three more electrons in the outermost orbital of the  phosphorus atom , new atomic number will be 18.

The atomic mass of the  phosphorus = 31.

The number of proton = number of electron = atomic number

So, the number of proton = 15

Due to gaining 3 electrons , the number of electrons will be 15+3 = 18

Therefore, the number of proton will be 15 and number of electron will be 18.

To know more about proton and electron.

https://brainly.com/question/13131235.

#SPJ2

Answer:

d = 0.84 g/cm³

Explanation:

Given data:

Mass of wood = 2.85 g

Volume of water = 20.0 mL

Volume of water + wood = 23.4 mL

Density of wood = ?

Solution:

Volume of wood = (Volume of water + wood ) - Volume of water

Volume of wood = 23.4 mL - 20.0 mL

Volume of wood = 3.4 mL

1 mL = 1 cm³

Density of wood:

d = m/v

d =  2.85 g / 3.4cm³

d = 0.84 g/cm³