Write a decay equation for neon-19

Answer: it is D

Explanation: got it wrong so y’all can get it right

Answer:

D. 200 meters

Hope this helps!

Explanation:

Answer:

a) 2H2O

Explanation:

I took the quiz

Answer:

2H20 or A- the other person was right:) give them brainliest.

Explanation:

I just took the test.

Answer:

A. synthesis

Explanation:

The reaction given is a synthesis reaction in which two substances combines to give a product.

In this reaction:

      4Fe + 3O₂ →  2Fe₂O₃

The reaction involves the formation of a single product from two or more reactants.

The formation of a compound from union of the constituent elements also falls into this category of reaction.

Explanation:

You need to remember a few things if you want the answer to this question...

Therefore you need to draw a atom that is similar to this:

Hope this helps.

0.057 M is the molarity of a solution prepared by diluting 125 mL of 0.400 M [tex]K_2Cr_2O_7[/tex] with 875 mL of water.

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Given:

[tex]V_1[/tex] =125 mL

[tex]V_2[/tex] =875 mL

[tex]M_1[/tex] =0.400 M

[tex]M_2[/tex] =?

[tex]M_1 V_1[/tex]=[tex]M_2V_2[/tex]

0.400 M x 125 mL = [tex]M_2[/tex] x 875 mL

0.05714285714 =[tex]M_2[/tex] = 0.057 M

Hence, 0.057 M is the molarity of a solution prepared by diluting 125 mL of 0.400 M [tex]K_2Cr_2O_7[/tex] with 875 mL of water.

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Answer:

[tex]Ka=7.73x10^{-5}[/tex]

Explanation:

Hello!

In this case, since the pH is measure of the amount of hydrogen ions in solution, first given the pH we can compute the concentration of hydrogen ions via:

[tex]pH=-log([H^+])[/tex]

[tex][H^+]=10^{-pH}=10^{-2.353}=4.436x10^{-3}M[/tex]

Thus, since the ionization of the given acid, leads to the following equilibrium expression as it is a weak one:

[tex]Ka=\frac{[H^+][A^-]}{[HA]}[/tex]

We notice the concentration of hydrogen ions equal the concentration of the acids conjugate base, so we can compute:

[tex]Ka=\frac{4.436x10^{-3}*4.436x10^{-3}}{0.259-4.436x10^{-3}}\\\\Ka=7.73x10^{-5}[/tex]

Best regards!

Answer:

b

Explanation:

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 60 × 20

We have the final answer as

Hope this helps you

Answer:

Ionic bonds

Explanation:

The force of attraction between the opposite charges of the ions in an ionic compound is called an ionic bond.

An ionic bond results from the electrostatic force of attraction between oppositely charged ions.

This attraction creates an ionic or electrovalent bond.

Answer:

Work shown below!

Explanation:

[tex]Hg^{+1} HSO_{4} =HgHSO_{4}[/tex]

Answer:

115.2ml of water should be added.

Explanation:

We start with 46.2ml of 1.396M sugar solution;

We want to end up with a 0.56M sugar solution;

Finding the number of moles in the sugar solution to begin with:

moles of sugar in solution initially = 46.2 × 1.396 = 64.4952

Vd = volume of desired solution (i.e. 0.56M solution)

w = volume of water added

Vd = (46.2 + w)

Using the mol = vol' × conc'n equation:

64.4952 = Vd × 0.56

Vd = 64.4952/0.56

Vd = 115.17

46.2 + w = 115.17

w = 115.17 - 46.2

w = 68.97ml

A balanced nuclear reaction equation indicates that there is a rearrangement during a nuclear reaction, but of subatomic particles rather than atoms. Nuclear reactions also follow conservation laws, and they are balanced in two ways: The sum of the mass numbers of the reactants equals the sum of the mass numbers of the products.

Please mark brainliest:)

Answer:

Explanation:

It's because of the sun! Bananas are curved so they can retrieve sunlight.

give him the brainliest

Answer:

[tex]\mathrm {CH_24}[/tex]

Explanation:

To determine the molecular formula, enter the appropriate value for the molecular mass. We get [tex]CH_{2}4[/tex] as our answer to the question.

Answer:

10.7g of [tex]CO_{2}[/tex]

Explanation:

Any gas at STP occupies 22.4 L/mol.

As such:

5.46/22.4 = 0.244 mol of [tex]CO_{2}[/tex]

mass = mol * molecular weight = 0.244 * 44 = 10.7g of [tex]CO_{2}[/tex]

The mass of a CO₂ gas sample that occupies 5.46 L at STP is 10.7 grams.

STP is defined as to enable comparisons between various sets of data, consistent sets of settings for experimental measurements must be defined. The abbreviation STP stands for standard temperature and pressure. Standard temperature and pressure refers to 273.15 K (0 C) and 1 bar, respectively (exactly 105 pascals ). For scientists to be able to compare different sets of data in a meaningful way, a global standard for temperature and pressure must be established.

At STP, any gas takes up 22.4 L/mol.

Thus, 5.46/22.4 = 0.244 moles of CO2

Mass, which is one mole times the molecular weight of 44 molecules

= 0.244 moles x 44

= 10.7 grams.

Thus, the mass of a CO₂ gas sample that occupies 5.46 L at STP is 10.7 grams.

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Answer:

Metal

Explanation:

Answer:

Explanation:metals

Answer:

1. True

2. True

3. True

4. Vertical

5. periods

6. All the given options

7. Atomic

8. False

9. False

10. 116

Thank you again :-D

Answer:

1. True

2. True

3. True

4. B. vertical

5. B. periods

6.  A, B, C, D

7. C. Atomic

8. B. false

9. A. True

10. A. 112

Explanation:

1. Helium is a natural gas found in the atmosphere and below ground.

2. Neon is also natural gas found in Earth's atmosphere and can be seen on the periodic table.

3. An element is considered a pure substance because it is made up of only one type of atom and cannot be broken down into a simpler form.

4. Families/groups go up and down (vertical), while periods go across (horizontal)

5. As I just mentioned, periods run horizontally on the Periodic table.

6.  Matter is everything that takes up space and has mass. Therefore, all of the given answers consist of matter. Why else would they matter? :)

7. The title of the "Most Accurate Clock In The World" goes to the British atomic clock at UK's National Physical Laboratory (NPL).

8. Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium. Therefore, we consist of more that 99%.

9. A grain of sand is relatively small; about the size of one atom.

10. The periodic table has 112 elements because there were 112 elements before IUPAC reviewed elements 113, 115, 117 and 118, and decided to give them official names and symbols. This was relatively recent. The total number of elements is 118 though.

I would like to apologize in advance if any of these were incorrect.

Answer:

Theory of Plate Tectonics

Explanation:

Scientists especially Geologists study and record seismic data and volcanic activities in order to support the theory of plate tectonics.

The theory of plate tectonics suggests that the earth is broken into slabs called the lithosphere that moves over the fluid asthenosphere below.

Answer:

[tex]m_{Cu(NO_3)_2}=2.36 gCu(NO_3)_2[/tex]

Explanation:

Hello!

In this case, since the chemical reaction between copper and nitric acid is:

[tex]2HNO_3+Cu\rightarrow Cu(NO_3)_2+H_2[/tex]

By starting with 0.80 g of copper metal (molar mass = 63.54 g/mol) and considering the 1:1 mole ratio between copper and copper (II) nitrate (molar mass = 187.56 g/mol) we can compute that mass via stoichiometry as shown below:

[tex]m_{Cu(NO_3)_2}=0.80gCu*\frac{1molCu}{63.54gCu} *\frac{1molCu(NO_3)_2}{1molCu} *\frac{187.56gCu(NO_3)_2}{1molCu(NO_3)_2} \\\\m_{Cu(NO_3)_2}=2.36 gCu(NO_3)_2[/tex]

However, the real reaction between copper and nitric acid releases nitrogen oxide, yet it does not modify the calculations since the 1:1 mole ratio is still there:

[tex]4HNO_3+Cu\rightarrow Cu(NO_3)_2+2H_2O+2NO_2[/tex]

Best regards!

Amount of copper (II) nitrate would be produced is 2.25 gram

Given that;

Amount of copper metal = 0.80 g

Find:

Amount of copper (II) nitrate would be produced

Computation:

Cu + 4HNO₃ → Cu(NO₃) + 2NO₂ + 2H₂O

Number of moles = Given mass / Molecular mass

Number of moles = 0.80 / 63.5

Number of moles = 0.012 mol

So,

n = Given mass / Molecular mass

0.012 = Given mass / 63.5 + (63.5 + 48)

Given mass = 2.25 gram

Amount of copper (II) nitrate would be produced = 2.25 gram

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The potential and kinetic energy of a falling book is present. Kinetic energy is indeed the force driving motion, manifested in the motion of a particle, an object, or a collection of particles.

The correct answer is A

Kinetic energy is the term for the energy present in an object in motion. Examples of velocity include your movement as you walk down the street and the planet's rotation around the sun. The formula for kinetic energy is as follows: K.E. is equal to half of an object's mass times its square velocity, or m/v2.

The capacity of kinetic energy to perform work is perhaps its most significant quality. The force applied to that of an object when it is moving is referred to as work. This intimate relationship between work and energy makes them go together.

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Answer:

The molecules inside the ice pack are frozen therefore they are stuck in place. The molecules inside an insulated cup aren't frozen but still stuck inside of their container so that they can not fly out.

Explanation:

Answer:

This is Ohio.

Explanation:

(no dude im dead i live in kentucky XP)

Answer:

option B is correct

Explanation:

impulse is a change in momentum

Answer:

2H2 + 02 --> 2H20

Explanation:

H2 + 02 --> H2O

H =2x2 = 4                |   H = 2 x 2 = 4

                                 |

O =2                          |   O = 1 x 2 = 2

dm me if u have questions regarding the solution hihi :)

Answer:

NaOH is the limiting reactant and MgCl2 is in excess.

Explanation:

let's calculate the mole of each reactant.

number of moles of MgCl2 = [tex]\frac{187}{1000} L* 0.103 mol / L =0.01926 mol\\[/tex]

number of moles of NaOH = [tex]\frac{33.58 }{1000}L * 0.839 mol/L =0.0282 mol[/tex]

as per the reaction , 1 mol of Magnesium choloride reacts with 2 moles of NaOH

hence 0.01926 needs 0.01926x2= 0.03852 moles of NaOH , but there are only 0.0282 moles of NaOH available .

The limiting reactant for the reaction between 187.0 mL solution of 0.103 M MgCl₂ and 33.58 mL solution of 0.839 M NaOH is NaOH

We'll begin by calculating the number of mole of MgCl₂ and NaOH present in the solution.

Volume = 187 mL = 187 / 1000 = 0.187 L

Molarity = 0.103 M

Mole = Molarity x Volume

Mole of MgCl₂ = 0.103 × 0.187

Volume = 33.58 mL = 33.58 / 1000 = 0.03358 L

Molarity = 0.839 M

Mole = Molarity x Volume

Mole of NaOH = 0.839 × 0.03358

Finally, we shall determine the limiting reactant. This can be obtained as follow:

MgCl₂ + 2NaOH —> Mg(OH)₂ + 2NaCl

From the balanced equation above,

2 moles of NaOH required 1 mole of MgCl₂.

Therefore, 0.028 mole of NaOH will require = [tex]\frac{0.0282}{2}\\[/tex] = 0.014 mole of MgCl₂

From the calculations made above, we can see that only 0.014 mole of MgCl₂ out of 0.019 mole reacted completely with 0.028 mole of NaOH.

Therefore, NaOH is the limiting reactant and MgCl₂ is the excess reactant.

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Answer:

True

Explanation:

Hope this helps! :)

Answer:

This is True.

Explanation:

Answer:

Number of moles

Explanation:

Using the number of moles in chemical reactions, we can determine the quantity of products and even the reactants that are combining to form them.

The number of moles is derived using the expression below is;

     Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

Once we establish the number of moles of any of the specie given from the mass and molar mass, we can relate it to any other species.

Answer:I think it's d but I could be wrong

Answer:

John Newlands

Explanation:

he established the law of octaves