Unlike particles in a liquid or a gas, the particles in a typical solid are arranged
A. separately from one another in constantly changing positions
B. in close contact with one another and in constantly changing positions
C. randomly in fixed positions
D. in orderly patterns and fixed positions

The pH of a solution can be determined by taking the negative logarithm (base 10) of the concentration of hydrogen ions (H+) in the solution. Based on the calculated pH of approximately 12.30, the solution is considered basic.  Hence, option C is correct answer.

Given: Concentration of NaOH = 0.0199 M

Since NaOH dissociates completely, the concentration of hydroxide ions (OH-) is equal to the concentration of NaOH:

[OH-] = 0.0199 M

Next, one calculate the pOH using the formula:

pOH = -log[OH-]

pOH = -log(0.0199)

pOH ≈ 1.70

To find the pH, one use the equation:

pH + pOH = 14

pH = 14 - pOH

pH = 14 - 1.70

pH ≈ 12.30

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Mass is conserved when 40 g of sodium hydroxide reacts with 36.5 grams of hydrogen chloride.

Sodium hydroxide reacts with hydrogen chloride according to the following equation:

NaOH + HCl ---> NaCl + H2O

Mole of 40 grams of sodium hydroxide = 40/40 = 1 mol

Mole of 36.5 grams HCl = 36.5/36.5 = 1 mole

From the equation of the reaction, the mole ratio of sodium hydroxide to hydrogen chloride is 1:1.

In other words, 40 grams of sodium hydroxide stoichiometrically balances 36.5 grams of hydrogen chloride.

Thus, the mass is conserved.

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Answer:

Molarity = 1.12 mol/L

Explanation:

To make an aqueous solution of Na₂O, the concentration will be calculated by: concentration (c) (or molarity) = number of moles present (n) ÷ volume needed (V) (in litres)

since we don't have moles, we can calculate moles by:

number of moles (n) = mass present (m) (in grams) ÷ molar mass (M) (in grams per mole), which we can find using a standard IUPAC Periodic Table

∴ n(Na₂O) = m/M = 34.8/(22.99×2+16.00) = 0.56147 mol

Now we have the number of moles present, we can calculate concentration:

∴ c(Na₂O) = n/V = 0.56147/0.50L = 1.12 mol/L

B. velocity

This is the answer

The number of moles required is 2.06 moles

Calculating the products and reactants in a chemical reaction is known as stoichiometry. Essentially, statistics are what it is about. Stoichiometry is a crucial idea in chemistry that enables us to compute reactant and product amounts using balanced chemical equations.

Number of moles of the HCl = 150 g/36.5 g/mol

= 4.11 moles

Then we have that;

1 mole of W(OH)2 reacts with 2 moles of HCl

x moles of W(OH)2 reacts with 4.11 moles of HCl

x = 2.06 moles

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Answer:

Boron and/or Polonium

Explanation:

In the periodic table, you can see a stair-stepped line starting at Boron (B), atomic number 5, and going all the way down to Polonium (Po), atomic number 84. Except for Germanium (Ge) and Antimony (Sb), all the elements to the left of that line can be classified as metals.

Answer:

bromine (br)

Explanation:

edg 2021

Answer:

why is ur name different sexxxy............................................................

Explanation:

Answer:   A

Explanation: The increase in acid strength with increasing number of terminal oxygen atoms is due to both an inductive effect and increased stabilization of the conjugate base.

Answer:

The substance is a mixture because it left a white powder in the beaker when boiled.

Explanation:

On the basis of the evidence collected, it can be concluded that unknown liquid substance is a compound as it left behind a residue in the beaker on decomposition.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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Here we go ~

Mass of 1 mole C - 12 atom = 12 g

So, mass of 1 carbon - 12 atom = ( 12 / 1 mole ) g

that is :

\(\qquad \sf  \dashrightarrow \: \cfrac{12}{6.022 \times 10 {}^{23} } \: \: g\)

[ since 1 mole = 6.022 × 10²³ ]

\( \qquad \sf  \approx2 \times 10 {}^{ - 23} \: \: g\)

Molarity :

Molarity is defined as " The number of moles of solute present in per litre of solution "

Molality :

Molality is defined as " Number of moles of solute present per kg mass of solvent "

As per the given reaction ~

\(\qquad \sf  \dashrightarrow \: Zn + 2\:H Cl \rightarrow ZnCl_2 + H_2\)

32.65 g of zinc reacted,

[ Number of moles of zinc reacted = mass of zinc reacted divided by its formula Weight ]

\(\qquad \sf  \dashrightarrow \: number \: \: of \: \: moles = \cfrac{32.65}{65.3} \: \: mol\)

\(\qquad \sf  \dashrightarrow \: number \: \: of \: \: moles = \cfrac{1}{2} \: \: mol\)

so, we can say that " half mole Zinc reacted with 1 mole of HCl to form half mole of Zinc chloride and half mole of Hydrogen gas "

And we already know that 1 mole of any gas occupies 22.7 litre volume at STP.

So, volume of Hydrogen gas Liberated :

\(\qquad \sf  \dashrightarrow \: \cfrac{1}{2} \times 22.7\)

\(\qquad \sf  \dashrightarrow \: 11.35 \: \: litres\)

The relationship between Molarity and molality can be expressed as :

\(\qquad \sf  \dashrightarrow \: M =\cfrac{ 1000(m \times d)}{1000+(m \times F)}\)

Terms :

\(\qquad \sf  \dashrightarrow \: M =\cfrac{ 1000(3 \times 1.110)}{1000+(3 \times 40)}\)

\(\qquad \sf  \dashrightarrow \: M =\cfrac{ 1000( 3.330)}{1000+120}\)

\(\qquad \sf  \dashrightarrow \: M =\cfrac{ 3330}{1120}\)

\(\qquad \sf  \dashrightarrow \: M =2.973 \: mol \: l {}^{ - 1} \)

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Explanation:

6 CO2 + 12 H2O ---->C6H12O6 + 6 O2+ 6 H2O

Answer:

Under the earth's surface, rocks melt, metamorphize, and crystalize.

Explanation:

Metamorphic and Igneous rocks are basically dependant on the heat/pressure of the environment under the surface :) Melting, metamorphosing and crystallization all occur under earth's surface.

The specific processes in the rock cycle that occur beneath the Earth surface are :

Under the Earth surface the specific rock cycle processes that leads to the formation of the different types of rocks includes;  Melting, metamorphization and rock crystallization.

Metamorphic rocks are formed from other rocks ( sedimentary and igneous rocks)  due to the change in temperature and this process is metamorphization. while igneous rocks are formed from molten rocks caused by the melting process. Sedimentary rocks are formed by the deposition of sediments from weathering of existing rocks this is the  crystallization process.

Hence the specific process in the rock cycle that occur beneath the Earth's surface are : Melting, metamorphosing and crystallization.

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The number of moles of agl needed to react with 85.0 g na2s is 1.09. Given that, the reaction is 2AgI + Na₂S → Ag₂S + 2NaI.

From the equation, we can see that for every 1 mole of Na₂S that reacts, 2 moles of AgI are needed. Therefore, we can use the following formula to find the number of moles of AgI needed:

moles of AgI = moles of Na₂S * (moles of AgI / moles of Na₂S)

We can find the moles of Na₂S by using the molar mass, which is the mass of one mole of a substance. The molar mass of Na₂S is:

Molar mass of Na₂S = 2(22.98977 g/mol) + 32.066 g/mol = 78.107 g/mol

Now we can substitute the known information into the formula and solve for the number of moles of AgI:

moles of AgI = (85 g of Na₂S) / (78.107 g/mol) * (2 moles AgI/1 mole Na₂S)

The number of moles of AgI is approximately: 1.09

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In the reaction : 2AgI  +   Na₂S    ----->   Ag₂S   +   2NaI, the number of the moles needed to react with the 85 g of Na₂S  is 2.16 mol.

The reaction is given as :

2AgI  +   Na₂S    ----->   Ag₂S   +   2NaI

The mass of the Na₂S  = 85 g

The molar mass of the Na₂S  = 78 g / mol

The number of the moles = mass / molar mass

                                           = 85 / 78

                                            = 1.08 mol

2 moles of the AgI react with the 1 mole of the Na₂S

moles of the AgI = 2 × 1.08

                            = 2.16 mol

Thus, the moles of the AgI is 2.16 mol.

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Answer:

when the coal is heat with presence of oxygen it's called combustion...

Answer:

In HCl,HH and HI dipole-dipole and London forces are present but in HF besides these, intermolecular hydrogen bonding is also present

Electronegtativity decreases from Cl to H so, dipole moment decreases from HCl to HH. As the boiling point is increasing from HCl to HH, it means London forces are predominant.

London force is directly proportional to the number of electrons in a molecule.

HF has the highest electronegativity, as a result, has highest dipole moment and also has hydrogen bonding therefore, HF shows the highest boiling point.

There is 1.0 mole of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution.

To determine the number of moles of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution, we need to use the equation:

moles = concentration (M) × volume (L)

Since 1 liter is equal to 1000 milliliters, we divide 500.0 mL by 1000 to get 0.5 L.

Next, we substitute the values into the equation:

moles = 2.0 M × 0.5 L

The concentration of 2.0 M indicates that there are 2.0 moles of KNO₃ in 1 liter of the solution. Therefore, multiplying the concentration (2.0 M) by the volume (0.5 L) gives us the number of moles of KNO₃:

moles = 2.0 M × 0.5 L = 1.0 mol

Hence, there is 1.0 mole of KNO3 in 500.0 mL of a 2.0 M KNO₃ solution.

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Answer:

guizzes

Explanation:

guizlet

Answer:

2. 8 moles of carbon dioxide can be produced from 12.5 moles of oxygen. 1 mole of octane can be produced from 8 moles of carbon dioxide gas.

Explanation:

hope this helps :)

Answer:

The sun, like all stars, is able to create energy because it is essentially a massive fusion reaction. Technically known as nuclear fusion, this process releases an incredible amount of energy in the form of light and heat.

Types of energy produced: Stars produce energy from nuclear reactions, primarily the fusion of hydrogen to form helium.

Explanation:

hope this helped :D

1) To determine the solubility of potassium chloride at different temperatures, we can refer to a solubility curve for potassium chloride. Unfortunately, since the solubility curve is not provided, I cannot give you the exact solubility values at 80°C and 40°C. Solubility is typically given in grams of solute per 100 grams of solvent (usually water) at a specific temperature.

2) To calculate the mass of potassium chloride that would crystallize out of solution, we need to determine the difference in solubility between 80°C and 40°C. Let's assume that at 80°C, the solubility of potassium chloride is 50 g/100 g of water, and at 40°C, the solubility is 30 g/100 g of water.

The initial amount of potassium chloride in the solution is 50 g (saturated solution in 100 g of water at 80°C). At 40°C, the solubility decreases to 30 g/100 g of water.

The amount of potassium chloride that crystallizes out can be calculated by subtracting the final solubility from the initial amount:

50 g - 30 g = 20 g

Therefore, 20 grams of potassium chloride would crystallize out of the solution when cooled from 80°C to 40°C.

Answer:

Temperate Deciduous Forest

Explanation:

Answer:

When a boy smells the aroma coming from the pot on the stove is actually detecting the chemicals coming from the air which comes from hot food that dissolves in the mucus present in the nasal cavity that carries tiny hairs made up of the nerve fibers that absorb these chemicals and excite or stimulate the olfactory receptors.

Various types of a distinct aroma or smell lead to a specific combination of the olfactory cells to make a specific smell. These combination patterns transported to the olfactory bulb along axons; a long extended neuron.

The sensory patterns or information encoding the smell of food present in the pot reaches the primary olfactory cortex in the brain, which is present on the anterior surface of the temporal lobe, and decodes accordingly.

Answer:You breath in what you smell and if it smells good or not you usely get up an see what is in the kitchen

Explanation:

Answer:

Explanation:

rate = Δ[C]/Δt,

Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.

Answer:

These all are physical properties except reaction with water.

Explanation: