Please help with chemistry homework (I’ll mark brainliest!)

the gravity of the sun keeps them in their orbits just as the moon orbits the earth because of the pull of Earth's gravity the earth orbits the sun because of the pull of the sun's gravity

Order of metals from least reactive to most reactive: B <C <A <D

Reducing agents are substances that experience oxidation  

Oxidizing agents are substances that experience reduction

The metal activity series is expressed in voltaic series  

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au  

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent  

The more to the right, the metal is less reactive (harder to release electrons) and the stronger oxidizing agent

So that the metal located on the left can push the metal on the right in the redox reaction  

Let's analyze the statement in the problem

I. Only A, C and D react with 1 mol/L HCl to give H₂(e)

M + HCl ⇒ MCl + H₂(MCl : alkali, MCl₂ : alkaline earth)

A, C and D can react with 1 mol / L HCl, meaning metals A, C and D are located to the left of element H (more reactive), and B in the right of element H

II. When A is added to solutions of the other metal ions, metallic B and C are  formed but not D.

This means that metal A is more reactive than metals B and C, while D is more reactive than A, so metal D is the most reactive

Answer:

(D) The minimal chance that the newly formed neutrons of a fission

Explanation:

I got it right on A P E X

Answer:

D. the minimal chance that the newly formed neutrons of a fission

reaction are absorbed by more atoms.

Explanation:

took test

Answer:

Organism B produces pyruvic acid at a faster rate as the temperature increases than Organism A.

Explanation:

Answer:

D

Explanation:

The potential energy curve of a system of atoms define the potential energy of the atoms with respect to the inter-nuclear separation. The minimum point of the curve represents the equilibrium bond length of the bond.

The energy of the system depends on the distance between the two interacting atoms.

Looking at the potential energy curve for hydrogen molecule in option D, we can assert that a chemical bond indeed exists between the two atoms of hydrogen and the minimum point of the curve is the equilibrium bond length of the bond.

A common relation between potential energy and internuclear distance when stated, is applicable to the ground states of diatomic and polyatomic molecules.

The potential energy of two separate hydrogen atoms often becomes lower as they approach each other, and the single electrons on each atom are shared to form a covalent bond.

The bond length is regarded as the internuclear distance where the lowest potential energy is gotten. The strong attraction of each shared electron often stabilizes the system.

Learn more from

https://brainly.com/question/18484436

Answer: C

Explanation: Answered this same question on a test before

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{5.6 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 93.023...[/tex]

We have the final answer as

Hope this helps you

Answer:

4.36 ppm

Explanation:

First we convert percent transmittance to absorbance:

Then we calculate the concentration of the solution, using Lambert-Beer's equation:

It is usually used with molar concentrations but given that the given absortivity is in ppm terms and the answer is also in ppm, we can simply use the given value.

The concentration of the solution is 4.36 ppm when the percent transmittance measured in a 1.00 cm cell is 53.9%, the absorptivity is 6.14x10⁻² L/(mg*cm), and the wavelength is 580 nm.        

We can calculate the concentration of the solution with the Beer-Lambert equation:  

[tex] A= \epsilon Cl [/tex]   (1)  

Where:

With the transmittance, we can find the absorbance as follows:

[tex] A = -log T [/tex]  

Where T is the transmittance = 53.9% = 0.539

So, the absorbance is:

[tex] A = -log T = -log(0.539) = 0.268 [/tex]

Finally, by solving equation (1) for C, we have:

[tex] C = \frac{A}{\epsilon l} = \frac{0.268}{6.14 \cdot 10^{-2} L/(mg*cm)*1.00 cm} = 4.36 mg/L [/tex]

Therefore, the concentration of the solution is 4.36 ppm.

You can find more about absorbance and transmittance here:

I hope it helps you!

Answer:

what are the choices?

Explanation:

Answer:

E and B

Explanation:

the warmer the weather the faster it will decompose, this why is why sometimes bodies last longer frozen, or in cool temperatures.

that statement takes a out.

An illness shouldn't effect a decomposing body

Weight also shouldn't effect a decomposing body

Being buried can make bodies decompose fast because of all the bugs and other animals that will get down there and decompose it faster

Answer: B,E

Answer: yes

Explanation:

Answer:

I believe it is a chemical change.

Answer:

never move

Explanation:

Just like an electric current, we can only see the effects of magnetism when an electron is subjected to two simultaneous constant magnetic fields.

An electron at rest that is subjected to a magnetic field will never move but only in an electric field. The electrons are subjected to an electric force collinear with the electric field but in the opposite direction (the charge is negative).The acceleration vector tends to be in the same direction as the force, opposite the electric field.

Answer:

Heritable traits are known to be passed from one generation to the next via DNA, a molecule that encodes genetic information. ... Organisms inherit genetic material from their parents in the form of homologous chromosomes, containing a unique combination of DNA sequences that code for genes.

Explanation:

Answer:

  Graphite

Explanation:

The structure of diamond is similar to that shown, but has a middle layer that is offset from the others. The structure of Buckminsterfullerene is that of a soccer ball, 60 atoms arranged in a 32-faced figure.

The structure shown matches that of graphite.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{5.25 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 87.209302...[/tex]

We have the final answer as

Hope this helps you

Answer:

it affects by how many fishes it kills i think

Explanation:

Answer:

It is necessary to use models to study sub- microscopic objects such as atoms and molecules because they are too small to be seen.

Explanation:

because of double bond within chemical foundation.

Answer:

Saturated fatty acids exhibit a linear structure while unsaturated fatty acids bend, or kink, due to double bonds within the chemical foundation.

Answer:

The right answer is Option d (0.00103 M).

Explanation:

The given values are:

T = 31.6

e = 487 L mol cm

length, l = 1 cm

As we know,

Absorbance,

[tex]A=2-log_{10}(percent \ T)[/tex]

[tex]A=2-log_{10}(31.6)[/tex]

[tex]A=0.5003[/tex]

By using the Beer's law, we get

⇒ [tex]A=ecl[/tex]

⇒ [tex]c=\frac{A}{el}[/tex]

On substituting the values, we get

⇒    [tex]=\frac{0.5003}{487\times 1}[/tex]

⇒    [tex]=0.001027 \ \frac{mol}{L}[/tex]

⇒    [tex]=0.00103 \ M[/tex]

Answer:

Nitrogen

Explanation:

Answer:

add

Explanation:

Answer:

Explanation:

Solar energy

Your answer  is 100% Solar Energy,

Answer:

final volume = 10.5 Liters N₂(g) at 21°C and 823Torr*

Explanation:

*Note=>No specified mass value of N₂(g) is defined in the problem. Therefore for a starting point, the gas sample is assumed to be 1.00 mole N₂(g) at STP conditions  22.4L

Determine volume of  N₂(g) at 21°C(=294K) and 823 Torr (= 2.286 Atm).

Start with Volume of N₂(g) at 0°C and 1 Atm pressure => 22.4L and adjust to final volume of  N₂(g) based upon 21°C(=294K) and 823 Torr (= 2.286 Atm).

V(final) = 22.4L(294K/273K)(360 Torr/823 Torr) = 22.4L(294/273)(360/823) = 10.55 Liters final volume.

Note: The volume of 1 mole (assumed) of any gas at STP (0°C/1 Atm) is 22.4 Liters. To convert to non-STP conditions, convert temperature and pressure factors (changes) that reflect what happens when the gas is expanded or decreased; but, these adjustments are taken independently for each variable of interest.  The following notes explain.

For the increase in temperature from 0°C(=273K) to 21°C(=294K) one must apply a temperature ratio that will increase volume. That is, the change in volume due to the temperature change is 294K/273K. If a 273K/294K ratio were used the volume would have decreased. Not so for heating a sample of gas.

For the increase in pressure one should expect a decrease in volume. Therefore apply a pressure ration that will effectively decrease the volume of the gas. That is, to decrease a 22.4L sample at STP multiply the standard volume by a ratio of pressures that will decrease 22.4L to a smaller volume. That is, V(final by pressure effects) multiply by 360Torr/823Torr to decrease the STP VOLUME (22.4L) to the new non-standard volume. If 823Torr/360Torr were used, the final volume would not be smaller, but larger. Such is the physical effect of an increasing pressure change.

Answer:

Explanation:

First of all, let's write the equation of the reaction.

CH₃COOH + NaOH  ⇒ CH₃COONa + H₂O

The formula to be used here is CaVa/CbVb = na/nb

where Ca is the concentration of the acid (?)

Cb is the concentration of the base (0.175M)

Va is the volume of the acid (25 mL)

Vb is the volume of the base (37.5 mL)

na is the number of moles of acid (1)

nb is the number of moles of base (1)

Ca × 25/0.175 × 37.5 = 1/1

Ca = 0.175 × 37.5 × 1 /25 ×1

Ca = 0.263 M

The concentration of the acid in the sample was 0.263 M

Explanation:

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{2.91 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.04833887...[/tex]

We have the final answer as

Hope this helps you