18 protons
22 neutrons
18 electrons
how do i draw this ? please help ASAP.

Answer: it is D

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

Answer:

D. 200 meters

Hope this helps!

Explanation:

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:

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:

it's good because u learn about chemicals and fumes

irs bad because some smells are just horrible

Answer:c

Explanation:

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:

[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

Find more information about 'Molecular mass'.

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Explanation:

se

te

as

b

wish you the best on this assignment love, god bless you my dear .

Answer:

option B is correct

Explanation:

impulse is a change in momentum

Answer:

a. 4s

Explanation:

The outer energy level and sublevel used in the electron configuration for potassium is the 4s sub-level.

Potassium has 19 electrons.

The electronic configuration of this chemical element is:

                    1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

The outermost energy level is the 4s

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:

[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:

atom, ions, protons neutrons, atomic number

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:

John Newlands

Explanation:

he established the law of octaves