Balancing
equations
• Check that the Synthesis reaction is selected and
that all coefficients are set to one. (The
coefficients are the numbers in the boxes.)
Introduction: The equation H, + O, H,O is unbalanced because there are two oxygen atoms
on the reactants side of the equation, and only one on the products side of the equation. To
balance the equation, you cannot change the structure of any of the molecules, but you can
change the number of molecules that are used.
Question: How are chemical equations balanced?
1. Balance: Tum on Show histograms. The equation is balanced when there are equal
numbers of each type of atom represented on each side of the equation.
In the Gizmo, use the up and down arrows to adjust the numbers of hydrogen, oxygen, and
water molecules until the equation is balanced. When you are done, turn on Show
summary to check your answer.
Write the balanced equation here:
H2+
Н,0
to see other

Answer:

Absolute humidity

Explanation:

Answer:

sodium(Na) is more active between Li and Na because is larger in size. Outermost electrons are less tightly held in sodium than in lithium. As a result, sodium loses its outermost electron more easily than lithium.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 20 mL

density = 2 g/mL

The mass is

mass = 20 × 2

We have the final answer as

Hope this helps you

Answer:

72.66%

Explanation:

NH₄Cl reacts in presence of NaOH producing ammonia, NH₃, as follows:

NH₄Cl + NaOH → NaCl + NH₃ + H₂O

The residual NaOH reacts with H₂SO₄ as follows:

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O.

The equivalent-gram of H₂SO₄ are:

16mL * 0.1N * 1.06 = 1.696mEq.

As the complete residual solution is 100mL but the neutralization was made only with 10mL, the mEq you need to neutralize the residual NaOH is:

1.696mEq * (100mL / 10mL) = 16.96mEq.

The mEq of NaOH you add in the first are:

25mL * 0.95mEq = 23.75mEq

That means the NaOH that reacts = moles of NH₄Cl is:

23.75mEq - 16.96mEq = 6.79mEq = 6.79mmoles NH₄Cl =

6.79x10⁻³ moles NH₄Cl

In grams (Using molar mass NH₄Cl = 53.5g/mol):

6.79x10⁻³ moles NH₄Cl * (53.5g / mol) =

0.3633g of NH₄Cl are in the original mixture.

% is:

0.3633g/ 0.5g * 100 = 72.66%

The percentage of pure NH₄Cl in the mixture = 72.66%

Given data :

0.5 gm of mixture of NH₄Cl and NaCI

25 ml of 0.95 N NaOH

Determine the % of pure NH₄Cl in the mixture

Given that the reaction equation of the mixture is ;

NH₄Cl + NaOH ---->  NaCl + NH₃ + H₂O

And the residual solution reaction with H₂SO₄ is

2NaOH + H₂SO₄ ----> Na₂SO₄ + 2H₂O.

∴ H₂SO₄ ( equivalent gram )  = 16mL * 0.1N * 1.06 = 1.696

but the equivalent gram of H₂SO₄ required to neutralize NaOH = 1.696 * ( 100 mL / 10 mL ) = 16.96  

NaOH⁻ = 25mL * 0.95 = 23.75mEq ( from the first reaction equation )

next step : Determine the number of moles of NH₄Cl

 moles of NH₄Cl  = 23.75- 16.96 = 6.79 * 10⁻³

Final step : Calculate the % of pure NH₄CI in the mixture

moles of  NH₄Cl = 6.79 * 10⁻³

molar mass of  NH₄Cl  = 53.5g/mol

∴ mass of NH₄Cl = 6.79 * 10⁻³  * 53.5 = 0.3633g

% of pure NH₄CI in the mixture =  ( 0.3633 / 0.5 ) * 100 = 72.66%

Hence we can conclude that The percentage of pure NH₄Cl in the mixture is  72.66%

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Explanation:

please refer to the attached file (English)

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The number of valance electron is 6

Valence electrons are the electrons found in the outermost shell of an atom.

The given atom has the following electronic configuration;

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴

The number of valence electron in a given electronic configuration is determine as follows;

The number of valance electron is found in this sub-orbitals = 4s², 4p⁴

The number of valance electron = 2 + 4 = 6

Thus, the number of valance electron is 6

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Answer: A

Happens when familiar things are selectively ignored.

Answer:

Explanation:

25.8 ml of .095 N NaOH is needed to neutralise the remaining acid

equivalent of NaOH used = 25.8 x .095 / 1000 = .002451 gm equivalent .

acid remaining = .002451 gm equivalent .

acid initially taken = 100 ml of .1 N  /  1000  = . 01 gm equivalent

acid reacted with metal = .01  -.002451 = .007549 gm equivalent

This must have reacted with same gram equivalent of metal oxide

.007549  gm equivalent = .15 gm of metal oxide

1 gm equivalent = 19.87 gm

equivalent weight of metal = 19.87 - equivalent weight of oxygen

= 19.87 - 8 = 11.87 .

1

The statement that described a property that is unique to metalloids would be that they are semiconductive.

Generally, semiconductors are material that at equilibrium between the conductive nature of conductors and non-conductive nature of insulators. In other words, semiconductors are not as conductive as conductors neither are they total insulators.

Semiconductivity is a property that is unique to metalloids because their electrons are more strongly bound to the nucleus of their atoms than those of metals.

Shiny, solid, and brittleness are properties that are shared among a wide variety of materials but semiconductivity is a property that is unique to metalloids.

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Answer: Bbbbb

Explanation:

Answer:

29.854

Explanation:

12+17=29

.354+.5= 854

Answer:

Elements

Explanation:

An element is defined by the number of protons in its nucleus.

Answer:

ammonium chloride

Explanation:

Because NH is ammonium and Cl is chlorine

Answer:

people who discover new things fyi you dont have any answer choices on there

Explanation:

there are different type of scientist

Answer:

A scientist asks questions about the world.

Explanation:

Answer:

Researchers at Virginia Tech decided to try using biochar to help reforest the post-mining site soil. They got permission to apply a layer of biochar to a post-mining site before it was reseeded and replanted.

Answer:

the answer you are searching for is

Answer:

CnH2n-2 where n is the number of carbon atoms

Explanation:

for example :

pentayne

C5 H (5x2 -2 )

C5H8

Therefore, to make 3.00 L of a 1.90 M solution of sodium hydroxide, 228 grammes of sodium hydroxide must be dissolved.

We need to dilute 40 grammes of sodium hydroxide in one litre of water in order to create a solution with a 1 molar concentration. You can make 1M NaOH solution by weighing 39.9 g of NaOH granules and dissolving them in 1 litre of water.

We can use the following method to calculate the mass of sodium hydroxide needed to make the solution:

m = M × V × MW

where:

m = mass of solute (in grams)

M = molarity of the solution (in moles per liter)

V = volume of the solution (in liters)

MW = molecular weight of the solute (in grams per mole)

Substituting the given values, we get:

m = 1.90 mol/L × 3.00 L × 40.00 g/mol

m = 228 g.

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Answer:

600K

Explanation:

PV=nRT

T=PV/nR

= 1.6atm* 15.0L/ 0.5mol*0.0821LatmK^-1mol^-1

=600K

Answer:

The correct answer is atomic mass

Explanation:

on engenuity

Answer:

The correct answer is atomic mass.

Explanation:

I took the quiz on edginuity

Answer: Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations.

Atoms are made up of subatomic particles and gain or lose electrons to achieve the full electronic configuration and its octet.

The particle of matter has been constituted of at least a proton termed an atom. The electrons in orbitals and the protons and neutrons organized in a nucleus make up the main components of an atom.

Cations are the name given to ions that donate their electron. While anions are atoms that get extra electrons from other species. Seventeen protons and seventeen electrons make up a neutral chlorine atom. The octet needs one electron to be complete. Chlorine has the electrical configurations 2, 8, and 7, and will remain stable if it accepts an electron from a cation.

Therefore, atoms frequently absorb and lose electrons to maintain stability.

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Answer:

B has highest stability

Explanation:

as its octet is complete

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Answer:

1 cal = 0.004187 kJ

1,500,000 cal = 6280.5 kJ

Answer:

B

Explanation:

Answer:

vacuoles

Explanation:

Vacuoles are not only found in animal and plant cells, but on every given diagram vacuoles are huge and singular on a plant cell. Animals however, there are multiple and are much smaller

Given :

Two samples of matter differ in temperature by 20°C.

To Find :

The difference in temperature of these two samples using the  Kelvin scale.

Solution :

Let , initial and final temperature is [tex]T_i[/tex] and [tex]T_f[/tex] .

So , [tex]T_f-T_i=20^oC[/tex] .

Now , temperature in kelvin is given by [tex](T_i+273)[/tex] and [tex](T_f+273)[/tex] .

So , difference between them is :

[tex]=(T_f+273)-(T_i+273)\\\\=T_f-T_i\\\\=20\ K[/tex]

The difference in temperature of these two samples using the  Kelvin scale is 20 K .

Therefore , the magnitude of difference in kelvin and Celsius is same .

Hence , this is the required solution .

Answer:

Being a reaction that releases heat, it is considered exothermic.

Explanation:

That is why if we consider it exothermic, the heat that is released to the medium is chemical energy lost from the interaction between the chemical bonds throughout the reaction. Having said this, we can affirm that the energy of the links of the products IS LESS than that of the REAGENTS, otherwise it happens in the endothermic ones, where it occurs in a vice versa.

These processes tend to have greater entropy and greater disorder in the reaction, greater kinetic energy between the particles.

Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of mercury = 15 mL

density = 13.55 g/cm³

The mass is

mass = 13.55 × 15

We have the final answer as

Hope this helps you

Answer:

Explanation:

14 protons

17 neutrons

18 electrons

Mass number = ?

Mass number = protons + neutrons.

[tex]Mass\:number = 14+17\\\\Mass \:number = 31[/tex]

Atomic number = ?

The number of protons = atomic number.

Atomic number = 14

Charge = ?

The charge of an element = number of protons minus the number of electrons.

[tex]Charge=14 -18\\\\Charge = -4[/tex]