Name these compounds according to IUPAC.

Answer:

pH = 10.63.

Explanation:

Recall that lithium hydroxide (LiOH) is a strong base and hence dissociates completely into Li⁺ and OH⁻ ions.

Therefore, the concentration of OH⁻ ions is equivalent to the concentration of the base.

Find pOH:

[tex]\displaystyle \begin{aligned} \text{pOH} & = -\log[\text{OH}^-] \\ \\ & = -\log(0.00043) \\ \\ & = 3.37 \end{aligned}[/tex]

Using the relationships between pH and pOH, hence determine pH:

[tex]\displaystyle \begin{aligned}\text{pH} + \text{pOH} & = \text{p}K_w = 14.00 \\ \\ \text{pH} & = 14.00 - 3.37 \\ \\ & = 10.63\end{aligned}[/tex]

In conclusion, the pH of the solution is about 10.63.

Answer:

Answer below

Explanation:

Physical changes dont change the chemical makeup of an object. An example would be to tear a piece of paper. Tearing the paper doesnt change how the paper was made chemically

Chemical changes on the other hand do change the chemical makeup of an object. An example of a chemical change would be to bake a cake. The reason being that the chemical makeup of the cake batter is changed so that the actual cake is formed.

H2SO3 is the correct answer. I understand school is hard, but WORK HARDER!

Answer:

c. 0.220 mol H₂

Explanation:

No. of moles

[tex]{\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Answer}}}}}}}}}}}}}[/tex]

[tex] \sf C) \: 0.220 \: mol \: H_2[/tex]

Explanation:

1 mol = 22.4 litres

4.92 = how many moles?

[tex] \sf \implies \frac{4.92}{22.4} \\ \\ \sf \implies 0.2196 \\ \\ \sf \implies 0.220 \: mol \: H_2[/tex]

Answer:

c.

Explanation:

The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old, but the insect identity of the fossil has been contested. Global climate conditions changed several times during the history of Earth, and along with it the diversity of insects.

Answer:C

Explantion:This is The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old

Answer:

B

Explanation:

Carbon-14 will steadily decrease in a dead organism. Fossils are no different. Sense it's dead already, it will still be getting rid of the last bit of carbon-14 it has in a steadily way.

correct option is option B

Oxidation state of Na= +1

Oxidation state of O = +2

Let Oxidation state of Cl =x

Then,

(+1) + X + 3×(-2) = 0

X-5 = 0

so x = +5

Answer:

Magnesium is likely to be less reactive than both strontium and sodium

Answer:

The answer is Magnesium (Mg)

Answer:

An ideal gas has identical particles of zero volume, with no intermolecular forces between them. The atoms or molecules in an ideal gas move at the same speed. Almost all gases obey the gas laws within a limited range of pressures and temperatures.

hope this helps!

fringing reef..........

Answer:

E

Explanation:

The empirical formula has a mass of

3*C = 3*12 = 36

4*H = 4*1   =   4

1*O = 1 * 16 = 16                   Add

Total =          56

The actual mass of the molecule in nature is 112

Multiplier = nature's mass /  empirical formula mass

Values

Nature's mass = 112

Empirical mass = 56

Solution

Multiplier = Natures mass/Empirical Mass

Multiplier = 112  / 56

Multiplier = 2

Formula

Nature's formula = (Emperical Mass)_multiplier

Nature's formula = (C3H4O)_2                             Multiply

Nature's formula = C6H8O2

Check

C6 = 6*C = 6*12 = 72

H8 = 8*H = 8*1 =    8

O2 = 2*O = 2*16 = 32  Add

Total                      112  which checks with what is given.

Answer:

Frequency of the ultrasonic sound, f=1000kHz=10

6

Hz

Speed of sound in air, V

a

=340m/s

The wavelength (λ

r

) of the reflected sound is given by the relation:

λ

r

=V/f

=340/10

6

=3.4×10

−4

m.

(b) Frequency of the ultrasonic sound, f=1000kHz=10

6

Hz

Speed of sound in water, V

w

=1486 m/s

The wavelength of the transmitted sound is given as:

λ

r

=1486/10

6

=1.49×10

−3

m.

Answer:

Explanation:

''A conjugate acid is formed when a proton is added to a base, and a conjugate base is formed when a proton is removed from an acid.''

In a conjugate acid-base pair, only difference between molecules is the amount of ''H''

One molecule must have 1 more H

in the last example HNO2 and H2O, difference is not only the H amount also H2O doesn't have N. So we can't say they are conjugate acid-base pair.

Answer:

The molar mass of calcium hydroxide,

Ca(OH)2, is 74.092 g/mol.

Explanation:

The molar mass of a compound is determined by multiplying the subscript of each element in the formula by its molar mass (atomic weight on the periodic table) in g/mol, and adding the results.

The formula for calcium hydroxide is: Ca(OH)2

Molar Mass Ca(OH)2:

(1×40.078g/mol Ca)+(2×15.999g/mol O)+(2×1.008g/mol H)

=74.092 g/mol Ca(OH)2

Answer:

74.093 g/mol

Explanation:

Add the mass of Ca (found on the periodic table), the mass of 2 oxygens and 2 hydrogens together.

40.078+2(15.999)+2(1.00784)=74.093

Answer:

helium=1,2atm

argon=2,8atm

Explanation:

partial is pressure exerted by each gas in a system since 30% is helium it means 70% is argon

argon =70%x4

helium=30%4

Dalton's law of partial pressure is applicable to only ideal gas not to the vanderwaal gases. The partial pressure of helium and argon is 1.2atm and  2.8atm respectively.

According to Dalton's law of partial pressure, the total pressure of a mixture of gases is equal to the total sum of partial pressure of individual exerting on the walls of the container.

Mathematically,

Partial pressure=total pressure× mole fraction

Total pressure= 4.00 atm

percentage of helium = 30%=0.3

percentage of argon=100-30%=70%=0.7

Substituting the given values in above equation

Partial pressure of helium=4.00 atm× 0.3

Partial pressure of helium=1.2atm

Partial pressure of argon = 4.00 atm× 0.7

Partial pressure of argon = 2.8atm

Therefore, the partial pressure of helium and argon is 1.2atm and  2.8atm respectively.

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Answer:

According to the equation below salt is produced by BaH2s

Answer:

I think b is the correct answer

Answer:

b

Explanation:

is the dictionary definition of a word.

is the feeling or idea associated with a word.

Answer:

Ideal fuel shows the following characteristics:

• It should be less expensive,

• It should be easily available,

• It should produce a large amount of heat,

• It can be transported easily.

• It has high calorific value.

• It should burns easily in air at a moderate rate.

Answer:

1.Ecologists often estimate the size and density of. populations using quadrats and the mark-recapture method.

2. The two key components of ecosystem stability are resilience and resistance.

3.The availability of abiotic factors (such as water, oxygen, and space) and biotic factors (such as food) affect population

4. When the climate is changing in the colder direction it effects the planet in the opposite way than it does when it is changing in the warmer direction. Ad nauseam the contemporary, it’ll keep getting hotter and at a greater rate so the ecosystem is going to die.

Answer:

Because the Earth is always shifting, so research has to constantly be updated.

Lower rate after another 3 seconds of the given rate is concentration of reactants increased while the concentration of product decreased.

Rate of the reaction gives idea about the speed of the completion of the reaction or the formation of product.

Given rate of reaction = 1.8×10⁻⁶ m/sec

After 3 seconds rate of the reaction decreases, which means speed of the formation of product decreases as a result of which:

Hence, concentration of reactants increased while the concentration of product decreased.

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Answer:

B.  The concentration of reactants decreased while the concentration of product increased.

Explanation:

i took the test

Explanation:

option option B is the correct answer of given statement helium-4(He)=2

Answer:

3AlCl₃

Explanation:

molar mass of aluminum chloride AlCl₃ is 133.33 g/mole

133.33 times 3 is 400

put 3 in front of AlCl₃

3AlCl₃

https://study.com/academy/lesson/aluminum-chloride-formula-molar-mass-decomposition.htm

Answer:

it allows us to determine what substances will float and what substances will sink when placed in a liquid.

Answer:

Boiling: The process of conversion from liquid to gas on heating is called boiling.

Example: Water on heating turns into water vapour.

Melting: The process of conversion from solid to liquid at room temperature is called melting.

Example: Ice cream melting at room temperature.

Sublimation: The Conversion of solid to gas directly is called sublimation.

Example: Camphor, Dry ice

Explanation:

Hope it helps you:))))

Answer:

The Explanation

Explanation:

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The empirical formula of the compound containing 15.66% A and 84.34% Z as given from the question is AZ₂

Divide by their molar mass

A = 15.66 / 15.45 = 1.014

Z = 84.34 / 41.62 = 2.026

Divide by the smallest

A = 1.014 / 1.014 = 1

Z = 2.026 / 1.014 = 2

Thus, the empirical formula of the compound is AZ₂

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Answer:

single covalent bond

Explanation:

The bond formed between two atoms each sharing one electron is called single covalent bond

The figure 1 is the structure of diamond. The type of bond in diamond is covalent sp³ bond. DIamond exists in hexagonal arrangement of carbon atoms.

Allotropes are substances formed from a single elements with different number in various size and shape. Carbon exhibit catenation property which means it can forms chains with other carbon in any large number.

The allotropes of carbon are diamond, graphene and fullerene. Diamond is hexagonal arrangement of carbons atom bonded covalently in sp³ hybridisation.

In graphene as shown in the second figure, bonded carbons atoms are arranged as layers where carbon is in sp²hybridisation. In the case of fullerenes, there are both hexagonal and pentagonal rings adjacent to each and are formed by 60-70 carbons.

In all these allotropes, the bond type between two carbons atoms is covalent. Covalent bond is formed by sharing of electrons between the two atoms.

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