the mass number of an element whose atoms contain 18 protons, 22 neutrons and 18 electrons

Answers

Answer 1

Answer:

Argon has the chemical formula Ar. Argon has 18 protons and 22 neutrons in its nucleus giving it an Atomic Number of 18 and an atomic mass of 40. Argon is a Noble Gas. Argon is a gas at room temperature.

Explanation:


Related Questions

In a bond between potassium (K) and bromine (Br),

A.

the potassium atom will gain an electron and become smaller as a cation, while the barium atom will lose an electron and become bigger as an anion.

B.

the potassium atom will lose an electron and become smaller as an anion, while the barium atom will gain an electron and become bigger as a cation.


C. the potassium atom will gain an electron and become smaller as an anion, while the barium atom will lose an electron and become bigger as a cation.

D.

the potassium atom will lose an electron and become smaller as a cation, while the barium atom will gain an electron and become bigger as an anion.

Answers

Answer:

D (But as a heads up, you wrote barium instead of Bromine)

Explanation:

The Potassium atom will lose an electron since its valence shell only has one, while Bromine has 7 electrons in its valence shell. Potassium wants to get rid of its one electron, Bromine wants to gain that one electron to get a full shell.

Potassium will become a CATION with a positive charge (since it lost an electron), Bromine will become an ANION with a negative charge (since it gained an electron)

Advantages and disadvantages of titration?

Answers

Answer:

What are the advantages of titration?

Titrimetric analysis commonly referred to as volumetric analysis offers distinct advantages over cumbersome gravimetric methods:

Speed of analysis.

Instantaneous completion of reactions.

Greater accuracy due to minimization of material loss involved in decanting, filtration, precipitation or similar operations.

Explanation:

Disadvantages

It is a destructive method often using up relatively large quantities of the substance being analysed.

It requires reactions to occur in a liquid phase, often the chemistry of interest will make this inappropriate.

It can produce significant amounts of chemical waste which has to be disposed of.

It has limited accuracy.

hope this helps Please inform me if its helpful

The advantages of titration:

It is generally cheap, requiring little in the way of equipment.It does not require a high level of skill.It can often be done rapidly.Results are immediately available.

Disadvantages

It is a destructive method often using up relatively large quantities of the substance being analysed.It requires reactions to occur in a liquid phase, often the chemistry of interest will make this inappropriate.It can produce significant amounts of chemical waste which has to be disposed of.

What is titration?

Titration is a quantitative technique where a solution of a known concentration is used to determine the concentration of the unknown solution.

Titration is a technique where a solution of known concentration is used to determine the concentration of an unknown solution.

The Titration Process Is Influenced by the Following Factors:

Measuring methodInstrument (instrument uncertainty/abrasion of the burette)Electrodes (electrode uncertainty/alteration of electrodes)HandlingBalance (weighing error)TemperatureVolumetric solution (change of the concentration, through alteration, carbon dioxide, vaporation of water/solvent)

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15 POINTS AND BRAINLIEST



Martin hooked up the following circuit. He noticed that the light did not turn on. How could he fix the circuit to make it work?


A. Martin needs to have one wire coming from one side of the battery to the light bulb and one wire coming from the other side to the switch. To make a closed circuit, he can use a wire to connect the switch to the light bulb.


B. Martin needs to connect one wire from the switch to the battery and one wire from the battery to the light bulb. When he does this, it will be a closed circuit that allows electricity to flow.

C. Martin needs to turn the battery around. When he does this, it will become a closed circuit allowing electricity to flow through the circuit in a loop.

D. The switch is in the open position. If Martin lifts the switch, it will close the circuit and electricity will flow from the battery to the light bulb in a loop.
Question 17(Multiple Choice Worth 2 points)
(07.01 MC)

Answers

Answer:   maybe D sorry if it's wrong

Explanation:

I need help ASAP my final 20 points!!!

Answers

option d, good luck! :)

Use this oxidation-reduction reaction to answer questions about half-reactions:
Upper m g plus 2 upper H upper C l right arrow upper M g upper C l subscript 2 plus upper H subscript 2.
Classify these half-reactions by typing in “O” for “oxidation half-reaction,” “R” for “reduction half- reaction,” and “N” for “neither.”

Answers

Answer:

For those who need it, the answers are N, O, R

Explanation:

To solve such this we must know the concept of redox reaction. Therefore, the given reaction is an oxidation and reduction reaction. The oxidation reaction is Mg [tex]\rightarrow[/tex] MgCl[tex]_2[/tex] and reduction reaction is HCl [tex]\rightarrow[/tex]  H[tex]_2[/tex] .

What is chemical reaction?

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously. Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant.

Mg + 2HCl [tex]\rightarrow[/tex] MgCl[tex]_2[/tex] + H[tex]_2[/tex]

Mg [tex]\rightarrow[/tex] MgCl[tex]_2[/tex] O

HCl [tex]\rightarrow[/tex]  H[tex]_2[/tex]      R

Therefore, the given reaction is an oxidation and reduction reaction.

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how to tell if an electron will make a cation or anion

Answers

A cation is a positive charged ion and a anion is a negatively charged ion. An electron will make a cation if it is lost and a anion if it is gained.

The etymology of the prefix cat- means the way down: so think of the sun setting down and losing light. Cat = losing electrons (Such as in a CAThode ray).

The etymology of the prefix -an means upwards. So think of the sun rising up and becoming brighter. An = gaining electrons and becoming overall more negative as electrons are negatively charged.

1. In drawing Lewis structures, a single line (single bond) between two elements represents: ? a shared electron B. ? B 2 a shared pair of electrons c. ? an octet of electrons D. ? an unshared pair of electrons​

Answers

Answer:

B a shared pair of electrons (2)

Explanation:

In Lewis structures, a single line represents a single pair of electrons. This means that the elements share 2 electrons or one pair of electrons

Hope this helps!

The shared electrons behave as if they belong to both atoms in the bond and bind the two atoms together to form a molecule. The shared electrons are typically depicted as a line (—) connecting the bonded atoms. (A line in a Lewis structure represents two electrons. Therefore, option A is correct.

What is lewis structure ?

Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, are diagrams that depict the bonding between atoms in a molecule as well as any lone pairs of electrons that may exist.

A Lewis structure is based on the octet rule, which states that atoms share electrons in order for each atom to have eight electrons in its outer shell. An oxygen atom, for example, has six electrons in its outer shell.

Gilbert N. Lewis, who introduced the Lewis structure in his 1916 article The Atom and the Molecule, was named after it. Lewis structures expand on the electron dot diagram concept by adding lines between atoms to represent shared pairs.

Thus, option A is correct.

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Types of Reaction

A) Synthesis

B) Decomposition

C) Single displacement

D) Double displacement

E) Combustion

Answers

F - Synthesis

G - Single Displacement

H - Combustion

I - Double Displacement

Hope it helps :)

Identify the limiting reactant when 9.65-g H2SO4 reacts with 6.10-g of NaOH.

Answers

Answer:

3.56

Explanation:

20. A way to describe a chemical reaction
a. Equations
c. Molecules
b. Metals
d. Elements

Answers

D. Elements

Hope this helps

Which of the following is not an alteration of a document?
additions
obliteration
erasure
O all of these answers
charring
None of these answers
ill give brainley

Answers

charring is not an alteratiom of a document

Describe how this instrument works.
(legit this is 100pts so uhh help)
Operation

Answers

Answer:

This is a reflector telescope and  in which it captures different wavelengths of light and it hits one mirror, bounces back and hits another and then is shown through the eyepiece. It captures all of the visible spectrum and some areas above and below it. These telescopes are better for seeing big picture and not the fine details in planets surfaces.

Hope this helps!

Explanation:

Answer:

This is a reflector telescope and  in which it captures different wavelengths of light and it hits one mirror, bounces back and hits another and then is shown through the eyepiece. It captures all of the visible spectrum and some areas above and below it. These telescopes are better for seeing big picture and not the fine details in planets surfaces.

Hope this helps!

Explanation:

The reactant side of a balanced chemical equation is shown below,
PC15 + 4H20 →
How many hydrogen atoms should there be on the product side in the equation? (5 points)
8
6
4
2

Answers

Answer:

do u still need the answer..

Explanation:

Helppp plzzzz!!!!!!1Asappppp

Answers

Answer:

0.178M

Explanation:

The question can immediately be understood as comparing two states.

- The initial state M1 , V1.

- The Final state M2 , V2.

M - Molarity.

V - Volume (in mili liters/ml/ in this case).

The formula is stated as:

M1 * V1 = M2 * V2

Given- Required

M1 = 0.125M V1 = 265ml M2 = ?

V2 = 186ml

Plug these values into the formula above and divide V2 to get M2.

rearranged formula - M2 = M1 * V1 / V2 = 0.125M * 265ml / 186ml

= 0.178091397 M ~ ~ 0.178M.

which pair of atoms constitutes a pair of isotopes of the same element?

Answers

Answer:

element with same number of protons but different number of neutrons

brainliest plzzzzz

State of Matter refers to _______.

Answers

Answer:

matter refers to anything that has mass and volume which occupies space

Why are earthworms called as “friends of farmers”? Answer in no less than 4 sentences

Answers

Answer:

Organic matter composted with earthworms, often known as vermicompost, has been demonstrated in studies to have disease-suppressing qualities. The earthworms loosen the soil and enrich it with humus. As a result, they are known as farmer's pals. They help the crops grow healthier and over the time have earned farmers trust.

Explanation:

Hope this helps in some way!

when an electron is acquired by a neutral atom, the energy change is called

Answers

Answer:

when an electron is acquired by a neutron atom, the energy change is called its electron affinity

When an electron is added to a neutral atom to create a negative ion, the energy of the atom changes (in kJ/mole). This is how electron affinity is defined. Alternatively put, the possibility of the neutral atom receiving an electron.

What is electron affinity ?

The amount of energy released when an electron binds to a neutral atom or molecule in the gaseous state to produce an anion is known as the electron affinity of an atom or molecule.

Although there is a slight distinction between the two, electron gain enthalpy is occasionally also referred to as electron affinity. The amount of energy released when an electron is added to a single gaseous atom is known as the electron gain enthalpy.

The amount of energy released when an atom receives an additional electron is known as its electron affinity. The gaseous state is when electron affinities are measured. On the periodic table, electron affinities tend to shift from negative to positive as we move from left to right.

Thus, when an electron is acquired by a neutral atom, the energy change is called as electron affinity.

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Give braniliness
AH = ?
Select one:
O a. Hproducts/Hreactants
O b. products-Hreactants
O c. Hreactants+H products
O d. Hreactants-Hproducts

Answers

Answer:

I think its C

Explanation:

Astatine-218 has a half-life of 1.6 seconds. If you begin with a 1.7 g sample of astatine-218, how much of the sample remains after 3.2 seconds?​

Answers

Answer:

do you still need help on this question

Explanation:

Complex organisms require a large number of cells that
A.Complex organisms require a large number of cells that

Answers

Yes.
That’s the answer to your question

which two observers would be experiencing the same apparent solar time?

Answers

The observers which would experience the same apparent solar time are observer B and observer E. This means the correct response as per the full question indicated in the attached document is number 2.

Types of Solar Time

There are two types of Solar Time. They are:

Apparent Solar Time and Mean Solar Time

What is Apparent Solar Time?

Apparent solar time refers to the time of the day that is shown by the hour angle of the sun. It is also defined as the sun's position in the sky going by direct observation. Direction observation of the sun to determine Solar Time is possible using a Sundial.

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Normal human sex cells have 23 chromosomes. Use the art to determine the number of chromosomes a sex cell may have if the nondisjuction occured during Meiosis I. Include all possible chromosome totals.

Answers

Answer:

46.....................

The science of measuring chemicals that go into and come out of a reaction is called
O meteorology
O atomic mass measuring
O molar metrology
o stoichiometry

Answers

Answer:

I think it is stoichiometry

PLEASE HELP I AM FAILING

Answers

Answer:

160.3 g S

Explanation: there you go

Consider the following reaction:
Mg + 2H2O Mg(OH)2 + H2 ΔH = -353 kJ

This reaction is
A.
exothermic because heat is released.
B.
endothermic because heat is released.
C.
endothermic because heat is absorbed.
D.
exothermic because heat is absorbed.

Answers

Answer:

A

Explanation:

I think it's the answer

A small container of perfume is opened in a classroom. Soon every student in the room smells the perfume. Explain this in terms of molecules.

Answers

When perfume or cologne is sprayed into the air, it turns into a gas and its particles mix with other air particles that quickly move around the room. This is because gas is the least dense of the three states of matter. It moves quickly into any space or volume because it has the least density. This is called diffusion, when molecules or particles move from areas with high concentration to low concentration areas. 

Which statement best describes what happens to the stability of hydrogen and oxygen atoms when they form bonds in a water molecule?

Answers

Answer:

It's c

Explanation:

Because I've checked

can someone please explain how to find an emperical formula given mass not percentage?​

Answers

Answer:

1. Get the mass of each element by assuming a certain overall mass for the sample (100 g is a good mass to assume when working with percentages). ...

2. Convert the mass of each element to moles. ...

3. Find the ratio of the moles of each element. ..

4. Use the mole ratio to write the empirical fomula

Answer:

Multiply each result by the given mass.

Explanation:

Hi!

In order to find percent/mass composition you would

1. write the formula

2. calculate the molar mass for each equation

3. add all the masses to get the compound molar mass

4. divide each molar mass by the total mass

and then for mass composition, you would multiple eachy result by the given mass.

For example;

Calculate the number of grams of gold in 89.6 grams of gold(1) perchlorate.

Your formula would be AuClo4

Au : 196.96 x 1

Cl: 35.4 x 1

O: 16 x 4

Add the masses together to get 296.5 g/mol

Lets say we're looking for Oxygen. You would take what you got (16 x 4) and divide it by the total mass. 64/296.5

This would equal 0.215. Instead of multiplying this by 100 like you would for percent, for mass you would multiply by what is given. in this instance it is 89.6.

0.215 x 89.6 = 19

But the question is asking for gold,

197/296

= 0.664 x 89.6

= 59.5

Your answer would be 59.5 grams Au

Hope this helped! : D

It takes 60 mL of 0.20 M of sodium hydroxide (NaOH) to neutralize 25 mL of carbonic acid (H2CO3) for the following chemical reaction:


2 NaOH + H2CO3 → Na2CO3 + 2 H2O


The concentration of the carbonic acid is _____.

Answers

It requires 60 mL of 0.20 M sodium hydroxide [tex](NaOH)[/tex] to neutralize 25 mL of carbonic acid [tex](H_2CO_3)[/tex], hence the carbonate ions concentration is [tex]0.24M[/tex].

Given:

Reaction:

[tex]\to \bold{2NaOH + H_2CO_3 \to Na_2CO_3 + 2H_20 }[/tex]

[tex]NaOH[/tex] volume [tex](V_B) = 60 \ ml[/tex]  

[tex]H_2CO_3[/tex] Volume [tex](V_A) = 25\ ml[/tex]  

[tex]NaOH[/tex] Molarity [tex](C_B) = 0.20\ M[/tex]

[tex]H_2CO_3[/tex] moles [tex](n_A) = 1[/tex]

[tex]NaOH[/tex] moles [tex](n_B) = 2[/tex]

To find:

[tex]H_2CO_3[/tex] Molarity [tex](C_A) =?[/tex]

Solution:

Using the neutralization reaction:  

[tex]\to \frac{C_AV_A}{C_BV_B} =\frac{n_A}{n_B} \\\\[/tex]

[tex]\to C_B = 0.2\ M \\\\ \to n_A = 1 \\\\ \to n_B = 2 \\\\ \to V_B = 60\ ml \\\\ \to V_A = 25\ ml[/tex]

Calculating the [tex]C_A[/tex]:

 [tex]\to \frac{C_A \times 25}{0.2 \times 60} =\frac{1}{2} \\\\\to C_A =\frac{1 \times 0.2 \times 60}{2 \times 25} \\\\\to C_A =\frac{1 \times 2 \times 12}{2 \times 5 \times 10} \\\\ \to C_A =\frac{ 12}{ 5 \times 10} \\\\\to C_A = \frac{6}{5 \times 5} \\\\\to C_A = \frac{6}{25} \\\\\to C_A=0.24\ M[/tex]

Therefore, the concentration of carbonic acid is "0.24M".

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The concentration of carbonic acid( H₂CO₃) is 0.24 M.

The given reaction:

2 NaOH + H₂CO₃ → Na₂CO₃ + 2H₂O

Volume of NaOH  = 60mL

Volume of H₂CO₃ = 25 mL

Molarity of NaOH= 0.20M

To find:

Molarity of H₂CO₃=?

2 moles of NaOH and 1 mol of H₂CO₃ reacts to give 1 mol of Na₂CO₃.

Using the neutralization reaction:  

Consider A to be NaOH and B to be  H₂CO₃

[tex]\frac{\text{Number of moles of A}}{\text{Number of moles of B}} =\frac{\text{Molarity of A*Volume of A}}{\text{Molarity of B*Volume of B}}[/tex]

On substituting the values in order to calculate molarity of H₂CO₃:

[tex]\text{Molarity of B}=\frac{1*0.2*60}{2*25} \\\\\text{Molarity of B}=0.24M[/tex]

Therefore, the concentration of H₂CO₃ is 0.24 M.

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