HURRY PKEASE HELP!!!

Answer:

the sum of the atomic masses of the elements

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the correct option is option D.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

The relative mass is the mass that is with respect to mass of a matter that is considered as standard. In chemistry relative mass is equal to the mass of one-twelfth the mass of C-12 isotope .

Out of relative and average atomic mass, relative atomic mass is more accurate as it is calculated with respect to a standard quantity. Molar mass is mass of 1 mole of a compound. Molar mass is the  sum of the atomic masses of the elements.

Therefore, the correct option is option D.

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Answer:

:)

Explanation:

Property Nitrogen Bismuth

Atomic radius (pm) 56 143

First Ionization energy (kJ/mol) 1402 703

Common Oxidation state(s) -3 to +5 +3

Ionic radius (pm) 146(-3) 103(+3)

Answer:The nitrogen family includes the following compounds: nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). All Group 15 elements have the electron configuration ns2np3 in their outer shell, where n is equal to the principal quantum number. The nitrogen family is located in the p-block in Group 15, as shown below.

Periodic Trends

All Group 15 elements tend to follow the general periodic trends:

Electronegativity (the atom's ability of attracting electrons) decreases down the group.

Ionization energy (the amount of energy required to remove an electron from the atom in its gas phase) decreases down the group.

Atomic radii increase in size down the group.

Electron affinity (the ability of the atom to accept an electron) decreases down the group.

Melting point (amount of energy required to break bonds to change a solid phase substance to a liquid phase substance) increases down the group.

Boiling point (amount of energy required to break bonds to change a liquid phase substance to a gas) increases down the group.

Metallic character increases down the group.

Explanation:

Answer:

Wavelength of the photon depends on transition from different states.

Explanation:

The wavelength of the photon that is emitted from the atom during the transition depends on the transition from different states. If the photon is emitted from n=4 state to n=3 state, the wavelength of photon is 1875 while on the other hand, if the photon is emitted from n=5 state to n=3 state, the wavelength of photon is 1282. If the photon is emitted from n=3 state to n=2 state, the wavelength of photon is 656.

Answer:

663 g

Explanation:

Step 1: Write the balanced equation

2 LiOH + CO₂ ⇒ H₂O + Li₂CO₃

Step 2: Calculate the moles corresponding to 825 L of CO₂

At standard pressure and temperature, 1 mole of CO₂ has a volume of 22.4 L.

825 L × 1 mol/22.4 L = 36.8 mol

Step 3: Calculate the moles of H₂O formed from 36.8 moles of CO₂

The molar ratio of CO₂ to H₂O is 1:1. The moles of H₂O formed are 1/1 × 36.8 mol = 36.8 mol.

Step 4: Calculate the mass corresponding to 36.8 moles of H₂O

The molar mass of H₂O is 18.02 g/mol.

36.8 mol × 18.02 g/mol = 663 g

Answer:

When it is at its highest point

Explanation:

It is talking about potential not kinetic

The question is incomplete, the complete question is;

A block is pulled 0.90 m to the right in 2.5 s. What is the blocks average speed to the nearest hundredth of a m/s

Answer:

0.36 m/s to the hundredth place

Explanation:

Now let us remember the definition of speed. Speed is defined in physics as distance/time.

Here we have the distance as 0.9 m

We have the time as 2.5 s

Hence the average speed is obtained from;

Speed = 0.9/2.5 = 0.36 m/s to the hundredth place

Answer:

2Al+3Fe ------- Al2O3+3Fe

this is answer no 2

N2+3H2------- 2NH3

this is answer no 3

I think helps

Best of luck

Answer:

Concentration of Mg(OH)₂ is 0.600 M

Explanation:

Our solution is made by Mg(OH)₂, the solute and waterm as solvent. In the begining we convert the moles to mass:

18.6 g . 1 mol /41.32g = 0.450 mol.

As water is the solvent, the volume for the solution is 750 mL.

We define molarity as the amount of moles of solute, contained in 1 L of solution, but we can also say that molarity are the mmoles contained in 1 mL of solution

M = mol/L = mmol /mL

We convert the mol to mmol → 0.450 mol . 1000 = 450 mmol

M = mmol/mL → 450 mmol / 750mL ⇒ 0.600 M

Answer:

Phenylmethanethiol

Explanation:

Benzyl bromide is a compound from the toluene family with an alpha position substituent of bromine. When this compound (Benzyl bromide) reacts with sodium hydrogen sulfide, it yields a principal organic product called Phenylmethanethiol which is an alpha-toluenethiol that belongs to a group of aromatic compounds containing one monocyclic ring system comprising of benzene.

Answer:

c because they are the closest together

Answer: Covalent compounds form when atoms that have similar electronegativity values form covalent chemical bonds. When a covalent compound dissolves in water, it does not dissociate into ions. Because there are no free electrons or ions in the water (electrolytes) dissolved covalent compounds can't conduct electricity.

Explanation:

dude. g o o g l e.

Answer:

V₂ = 100 L

Explanation:

Given data:

Initial volume = 300.0 L

Initial pressure = 55.0 KPa

Final volume = ?

Final pressure = 165 KPa

Solution:

The given problem will be solved through the Boyle's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

55 KPa × 300 L = 165 KPa× V₂

V₂ = 55 KPa × 300 L / 165 KPa

V₂ = 16500 KPa.L/165 KPa

V₂ = 100 L

Answer:

There is 1.

Explanation:

There is only 1 iodine atom in HI. In addition to this, there is 1 hydrogen atom in HI.

According to the chemical formula, there is one iodine atom in one molecule of hydrogen iodide.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Answer:12 mol

Explanation: both vessels are at the same temp and pressure (and the pressure is low and/or the temperature high).

6.7mol per 1.3L = 6.7/1.3 mol/L

so in 2.33L = 6.7*2.33/1.3 = 12 mol

Answer:

the highest is "A" and the lower is "C"

Answer:

V = 268.8 L

Explanation:

Given data:

Number of moles of nitrogen = 12 mol

Temperature = 273 K

Pressure = 1atm

Volume occupy = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

1 atm × V = 12 mol ×0.0821 atm.L/ mol.K   × 273 K

V = 268.95 atm.L / 1 atm

V = 268.8 L

The molarity of an acetic acid solution : 0.321 M

Titration is a procedure for determining the concentration of a solution by reacting with another solution that is known to be concentrated (usually a standard solution). Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range  

Reaction

HC₂H₃O₂(aq) + NaOH(aq) → H₂O(l) + NaC₂H₃O₂(aq)

Molarity NaOh=0.212

volume NaOH=25 ml=0.025 L

mol NaOH =

[tex]\tt mol=M\times V\\\\mol=0.212\times 0.025\\\\mol=0.0053[/tex]

mol ratio NaOH :  HC₂H₃O₂ from the equation = 1 : 1, so mol HC₂H₃O₂ :

[tex]\tt \dfrac{1}{1}\times 0.0053=0.0053[/tex]

The molarity of acetic acid HC₂H₃O₂ :

[tex]\tt molarity(M)=\dfrac{n}{V}\\\\M=\dfrac{0.0053}{0.0165}\\\\M=0.321[/tex]

Or you can use titration formula :

[tex]\tt M_1V_1n_1=M_2V_2n_2(n=acid/base~valence, for NaOH~and~Acetic~acid=1)\\\\0.212\times 25\times 1=M_2\times 16.5\times 1\\\\M_2=\dfrac{0.212\times 25\times 1}{16.5\times 1}\\\\M_2=0.321[/tex]

Answer:

F

Explanation:

learned this before

Answer:

A Lewis base is any species capable of donating an electron pair.

Answer:

False

Explanation:

sounds waves can't travel so far

Answer:

P = 58.52 atm

Explanation:

Given data:

Mass of sample = 32.0 g

Pressure of sample = ?

Volume of gas = 850 cm³

Temperature of gas = 30°C

Solution:

Number of moles of gas:

Number of moles = mass/molar mass

Number of moles = 32.0 g/ 16 g/mol

Number of moles = 2 mol

Pressure of gas:

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

30+273 = 303 K

850 cm³ × 1L /1000 cm³ = 0.85 L

by putting values,

P× 0.85 L = 2 mol × 0.0821 atm.L/ mol.K  × 303 K

P = 49.75 atm.L/ 0.85 L

P = 58.52 atm

Answer:A

Explanation: I think I am right

The limiting reagent : HCl

Given

Mg + 2HCI - MgCl₂ + H₂

2.5 mol of Mg  and 4.0 mol of HCl

Required

the limiting reagent

Solution

A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients

mol ratio Mg : HCl =

[tex]\tt \dfrac{2.5}{1}\div \dfrac{4}{2}=2.5\div 2[/tex]

HCl as a limiting reagent(smaller ratio)

Answer:

More construction can happen with the metals that are mined, which can disrupt new ecosystems

Fossil fuels burned during mining release carbon dioxide, leading to ocean acidification

Explanation:

Good Luck!

answer: the answer is More construction can happen with the metals that are mined, which can disrupt new ecosystems.

Explanation:

since he wana give 2 dang on answers to a 1 answer question like dang!!

Answer:

Pb oxidation number is +2

C in CH4 is -4. H is +1. 4H + 1C = 0. ; 4(+1) + C = 0 ; C = -4

O is usually -2. 3O = 3(-2) = -6. ; 2Fe =. +6 ; each Fe is +3

2Ag = +2 since O = -2 ; each Ag = +1

Answer:

D highland

Explanation:

Answer:

A or C

Explanation:

it's one of those answers I'm sure of

Answer:

the element is fluorine

Explanation:

for the future, add up the little dots- which are electrons and the total of the dots is the atomic number, the little number on the periodic table.

Answer:

Ununennium, also known as eka-francium or element 119, is the hypothetical chemical element with symbol Uue and atomic number 119. Ununennium and Uue are the temporary systematic IUPAC name and symbol respectively, which are used until the element is discovered, confirmed, and a permanent name is decided upon. In the periodic table of the elements, it is expected to be an s-block element, an alkali metal, and the first element in the eighth period. It is the lightest element that has not yet been synthesized.

Explanation:

Answer: d

Explanation: Wind and rain interacted with the rock, breaking it into small pieces.

Keanu realizes the sand used to be part of the rock formations. Wind and rain interacted with the rock, breaking it into small pieces and turn into sand. Therefore, option D is correct.

A rock formation refers to a specific arrangement or pattern of rocks in a particular area that has formed over a long period of time due to geological processes such as erosion, weathering, and tectonic activity.

Wind and rain interacted with the rock, breaking it into small pieces. Over time, the forces of weathering and erosion can break down rock formations into smaller and smaller particles, including sand.

Wind can carry these particles away from their original location and deposit them elsewhere, such as on a nearby beach. In the case of the black sand on the beach in Hawaii, it is likely that the sand was formed from the weathering and erosion of the volcanic rock that makes up much of the island.

Thus, option D is correct.

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