How would you prepare 1.00 L of a 0.50 M solution of each of the following?
NiCl2 from the salt NiCl2. 6H2O

The effect of using plant food(Miracle grow) is providing nutrients for plants, increasing longevity, and fostering plant growth.

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Ionic bonding continued. In the reaction between lithium and oxygen, lithium donates its valence electrons to oxygen atoms.

Li ( Z=3 ) , E.C. 2,1

Lithium will lose one electron to form unipositive ions.

O ( Z=8 ), E. C. 2, 6

Oxygen will gain 2 electrons to form a negative ion

So the formula of Lithium oxide will be Li2O

Hence the number of oxide ions will be half the number of Lithium ions or 1.07 × 10^22 / 2 Or 0.585 × 10^22 ions.

As you can see in the animation to the right, two lithium atoms react with one of her oxygen atoms. Each lithium atom donates an electron to an oxygen atom. In ionic compounds, the total number of cation charges must equal the total number of anion charges. In other words, the connection must be neutral. This is an example of a binary ionic compound consisting of two elements, a cation, and an anion. Lithium, a metal, has a positive charge, and fluoride, a non-metal, has a negative charge, so these two ions are held together by an ionic bond.

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The number of moles 2.44 x 10²⁴ H₂O molecules will be having is 4.05.

Converting between molecules and moles is done by either multiplying by or dividing by Avogadro's number.  To go from molecules to moles, divide the number of molecules by 6.02 x 10²³.

Avogadro's number, which is equal to 6.022 × 10²³, is the number of units in one mole of any material (defined as its molecular weight in grams). Depending on the substance and the nature of the reaction, the units could be electrons, atoms, ions, or molecules.

Thus,

No. of molecules = No. of moles × Avogadro no.

from the question we know,

No. of molecules = 2.44 × 10 ²⁴

Avogadro no. = 6.02 × 10²³

i.e. 2.44 × 10²⁴ = No. of moles  × 6.02 × 10²³

No. of moles = 2.44 × 10 ²⁴

                         6.02 × 10²³

No. of moles = 4.05

The number of moles 2.44 x 10²⁴ H₂O molecules will be having is 4.05.

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Heavy metals such lead and arsenic does cause damage to human DNA.

Industries which release heavy metals into land and water ecosystems should be penalized.

However, the exposure of these heavy metals damage the body due to the by inhibiting proteins in DNA pathways during repairs.

The side or adverse effects of exposure of heavy metals have great risk to the well being of humans. Among these effects are as follows:

So therefore, heavy metals such lead and arsenic does cause damage to human DNA.

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The kind of chemical reaction that results in the formation of sodium chloride is a neutralization reaction.

Bases react to produce water and salt, which requires the interaction of H+ and OH- ions. A pH of 7 results from the neutralization of a potent acid and a potent base. A strong base neutralizing a weak acid will provide a pH result that is more than 7, while the neutralization of a strong acid and weak base will produce a pH result that is less than 7.

A solution is neutralized when equal amounts of acid and base combine to create salts. One mole of protons (H+) is equivalent to one mole of the base, and one mole of acid is equivalent to one mole of protons (H+) (OH-). N parts of acid will always neutralize N parts of the base because salts are created by neutralization reactions with comparable weight concentrations of acids and bases.

Therefore, the kind of chemical reaction that results in the formation of sodium chloride is a neutralization reaction.

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Answer:

Explanation:

55647 for b

The mass of ammonia gas produced by the given volume of hydrogen and nitrogen is 5.066 g.

The mass of ammonia in grams would be produced at temperature 288 K and a pressure of 0.87 bar is determined using the ideal gas equation.

The ideal gas equation is as follows;

PV = nRT

where;

P is pressure

V is volume

n is number of moles

R is molar gas constant = 8.314 × 10⁻² L.bar.K⁻¹.mol⁻¹

T is temperature in kelvin.

number = mass/molar mass

Considering the data provided, the moles of each gas present in their containers are as follows;

n = PV/RT

moles of nitrogen gas:

P = 0.87 bar,  V = 11.67, R = 8.314 × 10⁻² L.bar.K⁻¹.mol⁻¹, T = 288 K

n = 0.87 * 11.67/8.314 × 10⁻² * 288

n = 0.424 moles

moles of hydrogen gas:

P = 0.87 bar,  V = 12.3, R = 8.314 × 10⁻² L.bar.K⁻¹.mol⁻¹, T = 288 K

n = 0.87 * 12.3/8.314 × 10⁻² * 288

n = 0.447 moles

The equation of the reaction is given below:

N₂ (g) + 3 H₂(g) → 2 NH₃ (g)

From the equation, mole ratio of nitrogen to hydrogen is 1 : 3, therefore, hydrogen is the limiting reactant.

Moles of ammonia gas produced = 0.447 * 2/3 moles

Moles of ammonia gas produced = 0.298 moles

molar mass of ammonia gas = 17.0 g/mol

Mass of ammonia gas produced = 0.298 moles * 17.0 g/mol

Mass of ammonia gas produced = 5.066 g

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[tex] \huge \mathbb{\pink{\fbox{\blue{\underline{\green{ANSWER}}}}}} \\ \\ \tt (a) \: 1.37 \times 10 {}^{ 0} [/tex]

The two things shown by a chemical formula are: it tells the number of atoms of each element in a compound and symbols of the atoms of the elements present in the compound.

A chemical formula is used by scientists to represent the information concerning the elements and the types of elements found in a chemical compound.

A chemical compound is a substance that is made up of two or more elements which are chemically combined together.

There are various type of chemical formula which include the following:

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A scientific theory is backed up by pieces of evidence hence it is not a mere guess.

A scientific theory is a well crafted explanation of an observed phenomenon. A scientific theory is different from a mere guess in the sense that the scientific theory must have some basis that support it.

A mere guess does not have any kind of data that supports it. Let us take the theory of evolution as an example. Countless discoveries of fossil evidences have shed some light on the probability of the theory. In this case, we can not consider it a mere guess since there is some kind of evidence that supports the claims of the theory.

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Answer:

the areas which are flat in the heating curve is when matter is condensing

[tex]\implies[/tex] The correct answer is (B) 0.00037

[tex]\bf{ \underline{Step \: 1)} :3.7 × 10^{-4 }we \: can \: write \: as \:37 × 10^{-5}}[/tex]

[tex]\bf{ \underline{Step \: 2)} :37 × 10^{-5 } \: we \: can \: write \: as \: 37 × \frac{1}{10^5}}[/tex]

[tex]\bf{ \underline{Step \: 3)} :37 × \frac{1}{10^5}\: we \: can \: write \: as \: (37 × \frac{1}{(10)(10)(10)(10)(10)}})[/tex]

[tex]\bf{ \underline{Step \: 4)} :37 × \frac{1}{(10)(10)(10)(10)(10)} we \: can \: write \: as \: ( 37 × \frac{1}{100000}})[/tex]

[tex]\bf{ \underline{Step \: 5)} :37 × \frac{1}{100000} \: we \: can \: write \: as \: \frac{37}{100000}}[/tex]

[tex]\bf{ \underline{Step \: 6)} :\frac{37}{100000} \: we \: can \: write \: as \: 0.000037}[/tex]

The vapor pressure is obtained as 3.7 atm.

The Clausius-Clapeyron equation is the equation that we could use to obtain the vapor pressure of a solution at any temperature. Of course we would always have two different temperatures to work with.

Hence;

ln(P1/P2) = ΔHvap/R (1/T2 - 1/T1)

P1 = initial pressure

P2 = final pressure

ΔHvap =  enthalpy of vaporization

T2 = final temperature

T1 = initial temperature

ln(1/P2) = 35.2 * 10^3/8.314 (1/338 - 1/307)

ln(1/P2) = 4234(0.00295 - 0.00326)

ln(1/P2) = -1.31

1/P2 = e^-1.31

P2 = 1/e^-1.31

P2 = 3.7 atm

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Answer:

yes

Explanation:

it is a mixture of gases.

there are some other main gases like,

nitrogen with approximately 78%

and oxygen with 21%

and many other gases.

Answer: 9.946*10^-2 M

Explanation: if u multply

Answer:

radioactive decay or solar radiation

Explanation:

The quantity  in moles of sodium atoms is 0.631 moles of sodium if you have 3.80 × 10²³ moles  of sodium.

Moles is defined as a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules and some other specified particles.

It is a very important unit of measurement which chemist use. It can also be defined as the amount of substance that contain exactly 6.022 x 10²³ elementary entities in a given substances.

1 moles = 6.022 x 10²³ atoms

3.80 × 10²³ atoms of sodium will have

3.80 × 10²³  x 1 mole of Na /  6.022 x 10²³ atoms

= 0.631  moles of Na

Thus, quantity  in moles of sodium atoms is 0.631 moles of sodium if you have 3.80 × 10²³ moles  of sodium.

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Answer:

i think paint

Explanation:

hi

1 mile is  1 609 meters.  (rounded).

As there is 100 centimeters in a meter, then

1 mile is  160 900 centimeter.  

Then 1.5 miles , is 1 mile + one half so :

160 900 + 160 900 /2 =  160 900 + 80 450

                                     =  241 350

1.5 mile is  241 350  centimeters.  

please note that the value of a mile was rounded.

The average atomic mass of the two isotopes  is 7346.717 atomic mass units.

Average atomic mass  of an element  is the sum of masses of it's isotopes multiplied by it's natural abundance. The percent of natural abundance of isotope is converted in to decimal form by dividing it by hundred.

It is a fraction representing natural abundance of the isotope .It is found out because there is no mass set for an element.

To calculate average atomic mass, the given data is substituted in the formula,

average atomic mass=abundance×atomic mass of isotope 1 +abundance×atomic mass of isotope 2

=(0.158×71.68)+(99.842×73.47)

=11.3254+7335.39

=7346.71 atomic mass units

Thus, the average atomic mass is 7346.71 atomic mass units.

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Answer:

3.83*10⁻²¹ [J].

Explanation:

1) formula:

E=hν, where ν=5.77*10¹²; h=6.63*10⁻³⁴;

2) according to the formula above:

E=577*10¹⁰*663*10⁻³⁶=382551*10⁻²⁶ [J]≈3.83*10⁻²¹[J].

The reactants are CH4 and O2 and the products are CO2 and H2O. The coefficients for both CH4 and CO2 are 1, meaning that for each mole of CH4 consumed, 1 mole of CO2 is produced.

Solution:

X₂ (03 (s) + 24U (ag) → 2x4(aq) + [tex]H_{2}ol[/tex] + [tex]o_{2}(g)[/tex]

Moles of [tex]o_{2}[/tex] = Mass of CO₂ produced 0.5938/Molar mass of co₂

= 0.593g/44.01gmol·

= [tex]n_{co2}[/tex] = 1.35*[tex]10^{-2} mol[/tex].

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Answer:

The kinetic energy is,

Explanation :

The formula for kinetic energy is:

where,

R = gas constant = 8.314 J/mol.K

T = temperature =

Now put all the given values in the above kinetic energy formula, we get:

Therefore, the kinetic energy is,

Explanation:

The correct answer is 3.68 × 10^23 atoms.

The Avogadro's number is the number of constituent particles—typically molecules, atoms, or ions—that make up a mole of a substance. The relationship between the molar mass of a substance and the mass of a sample is determined by its proportionality. In the International System of Units, it has the symbol NA or L and a value of 6.022140857 × 10^23 mol^-1 (SI).

Weight of C6H6 = 8 gram

C6H6 Molar mass is = 78 gram/mole

Mole of C6H6 = 8 / 78 mole

= 0.102 mole C6H6

Mole of C6H6 = No. of C6H6 molecule / Avagadro number

0.102 × 6.03 × 10^23 = No of  C6H6 molecule

Here 6 atoms in  C6H6 molecule so

No. of H atoms in  C6H6 = 0.102 × 6.03 × 10^23

= 3.68 × 10^23 atoms

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The mass of the silver that will raise the water by 1.5 mL is 15.75 g

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

With the above formula, we can obtain the mass of the silver. Details below

Density = mass / volume

Cross multiply

Mass = Density × Volume

Mass of silver = 10.5 × 1.5

Mass of silver = 15.75 g

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Mass of chromium contained within a sample of chromium (III) chloride with mass of 83.1g is 27.25 g

Given,

chlorine present in 15.8 g of sample of chromium (III) chloride is 10.6g

we have to find out mass of chromium present in 83.1 g of chromium (III) chloride.

First step is to find out mass percentage of chlorine and chromium atom in CrCl3.

No. of atoms of chromium in chromium (III) chloride = 1

molar mass of chromium = 52 g/mol

Total mass of element = 52 × 1 = 52

No. of atoms of chloride in chromium (III) chloride = 3

molar mass of chloride = 35.5g/mol

Total mass of element = 35.5 × 3 = 106.5

Total mass of chromium (III) chloride = 158.5 g/mol

mass percentage of chromium = 32.8 %

mass percentage of chloride = 67.1 %

So, the mass of chromium present in chromium (III) chloride = (32.8 / 100) × 83.1

= 27.25 g

Therefore mass of chromium in 83.1g of chromium (III) chloride is 27.25 g

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The density of the solid block is 3.79 * 10⁻³ g/cm³.

The density of a substance is defined as the ratio of mass and volume of a substance.

Density measure how close together the particles of a given mass of a substance is. Substances with high density have greater masses compared to the volume of those substances whereas substances with low densities have greater volume compared to their masses.

The volume of the solid block = 78 * 55 * 35 = 150150 cm³

mass of solid block = 569 g

Density of the solid block = 569 g/150150 cm³

Density of the solid block = 3.79 * 10⁻³ g/cm³

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The forward reaction in the tetra-chloro cobalt(II) ion and hexa-aquo cobalt ion equilibrium is a exothermic process.

The reaction is exothermic in the forward reaction because Co(H₂O)₆[tex]^+2[/tex]  is more stable than CoCl₄[tex]^2-[/tex] as the bond are stronger in aquo complex of cobalt than in chlorate complex.

It is expected that if temperature is increased, reaction will occur in reverse direction to favoring endothermic reaction ,and if temperature is decreased exothermic reaction is favored.

In exothermic reaction,the color of complex is pink due to an increase in the number of water molecules while in endothermic reaction there is an increase in the concentration of chloride ions which leads to blue color solution.

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The velocity vs. time graph that corresponds to the info shown by the position vs. time graph is that the graph that has continuous acceleration (straight line).

The above statement of continuous acceleration means a relentless acceleration. A straight lines is just known to be a continuing acceleration that's said to be unchanging. Note that when there's a curved lines in a very graph, it implies that there's a non-constant acceleration. Therefore an object that's undergoing constant acceleration is one that may be seen in an exceedingly line. So therefore, the speed vs. time graph is one that matches with the information represented by the continual acceleration (straight line) on the graph.

Constant acceleration means that velocity changes at a constant rate with respect to time. If acceleration is made zero, velocity does not change. If acceleration is positive, the magnitude of velocity increases correspondingly.

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Answer:

your answer is c your welcome

Explanation:

Masses of water and carbon dioxide be 54 g and  66 g respectively.

Mass is a measure of the amount of matter that an object contains

Here given data is 1.00 x10⁵ grams of oxygen and  1.00 x10⁵ grams of methane and the reaction is

CH₄ +2O₂ → CO₂ + 2H₂O

Then (12+4)= CH₄ , 2×(16×2)=2O₂  , 12+(16×2)=CO₂  , 2×(16+2)=2H₂O

CH₄ = 16 g, 2O₂ = 64 g, CO₂ = 44 g, 2H₂O = 36 g

Then, we have to find masses of water and carbon dioxide = ?

24g of CH₄=24/16×44 = 66 g of CO₂

16 g of CH₄ will produce 36 g of water

Then, 24 g of CH₄ = 24/16×36 = 54 g of water

Mass of water is  54 g and mass of carbon dioxide is 66 g

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