The sodium salt, NaA, of a weak acid is dissolved in water; no other substance is added. Which of these statements (to a close approximation) is true?

Answer:

H₂CO₃

Explanation:

Water + Carbon di oxide

H20+ CO2

= H2CO3

t = 57 min., Therefore, we can say that it takes 57 minutes for cyclopropane's partial pressure to drop from 1 atm to 0.125 atm at 500°C.

Propene (CH3CH=CH2) is produced by the isomerization of cyclopropane, which is a first-order process. A sample of cyclopropane converts to propene in 79 minutes at 760 K.

The reaction is a first-order reaction because it is an isomerization reaction, and its rate constant is expressed in terms of minutes. The sum of the powers or exponents that the concentration terms are raised in the rate law expression can be used to define the order of a reaction.

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Answer:the answer is b

Explanation:

Answer:

Protons-2 for both

neutrons-2 for helium-4 and neutrons-3 for helium-5

electrons-1 for both

Explanation:

draw a ring and put protons and neutrons in the middle and the electrons on the ring

Answer:

Thats potassium (k)

Explanation:

Answer:

Explanation:

To maintain homeostasis, unicellular organisms grow, respond to the environment, transform energy, and reproduce. The cells of multicellular organisms become specialized for particular tasks and communicate with one another to maintain homeostasis. All body systems work together to maintain homeostasis.

Being made up of many cells helps large organisms maintain homeostasis as follows:

Cells act in a coordinated way in the organisms and they prevent changes in the environment from interfering with their functioning.

The existence of large complex organisms was only possible thanks to the evolution of an internal environment, whose physical and chemical conditions must be maintained at relatively constant levels, favorable for cells.

The cells were able to specialize in tasks that would help maintain specific aspects of the internal environment.

For example, some cells organized into tissues specialized in maintaining the balance of salt and water; others, in providing nutrients; while others, in maintaining appropriate levels of oxygen and carbon dioxide.

In addition, specialized tissues and organs form systems within the internal environment of the organisms.

For example, the digestive system that provides nutrients; while the cells related to the circulation, among other things, distribute oxygen and nutrients.

In this way, specialized cells and tissues must continuously correct the physical and chemical composition of the internal environment, so that it remains conducive to life.

The maintenance of relatively constant conditions in the internal environment is what is called homeostasis.

Therefore, we can conclude that being composed of many cells helps large organisms to conserve specific aspects of the internal environment to maintain its homeostasis.

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Answer:

Digestion is not an example of combustion. Digestion is an endothermic process where energy is utilized to break down the complex food molecules into simple forms. In a combustion reaction carbon dioxide,water,energy and some by products are released.

Explanation:

Answer:

Alchohol, Disenfective wipes, Bleach, Soap,

Explanation:

The density of rock weighing 1.705 kg is 3.213 gm/ml.

Explanation:

Given;

Volume of rock = 334.5 ml

Weight of rock = 1.075 kg = 1075 gm

By the formula,

Density = Weight in gm/Volume in ml

              = 1075/334.5 gm/ml = 3.2137 gm/ml

Therefore, density of rock is 3.213 gm/ml.

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The mass of O₂ required to make 3.0 kg of copper is 1585 g.

The mass of oxygen required is determined as follows;

The equation of reaction is:

Cu₂O (s) + C (s)→ 2 Cu (s) + CO (g)

1 mole of Cu₂O produces 2 moles of Cu

Molar mass of Cu = 64.0 g/mol

Molar mass of Cu₂O = 144 g/mol

144 g of Cu₂O produces 64 g of Cu

3.0 kg of Cu = 3000 g

Mass of Cu₂O required to produce 3000 g of Cu = 3000 * 144/(64 *2)

Mass of Cu₂O required to produce 3000 g of Cu = 3375 g of Cu₂O

The percent yield is 78%

Hence the mass of Cu₂O required = 3375 g / 0.78

mass of Cu₂O required = 4326.9 g of Cu₂O

From the first reaction equation, 3 moles of O₂ produce 2 moles of Cu₂O

3 * 32 g of O₂ produces 2 * 144 g of Cu₂O

mass of O₂ required to produce 4326.9 g of Cu₂O = 4326.9 * 96/288

mass of O₂ required to produce 4326.9 g of Cu₂O = 1442.3 g

The percent yield is 91%

Hence the mass of O₂ required = 1442.3 g / 0.91

The mass of O₂ required = 1585 g of O₂.

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The amount in moles of the excess reactant left is 0.5 mole.

Balanced equation- 2ZnS (s) + 3O₂(g) --> 2ZnO (s) + 2SO₂(g).

What is another name for zinc sulfide?

From the balanced equation,

2 moles of ZnS reacted with 3 moles of O₂

How to determine the excess reactant

From the balanced equation,

2 moles of ZnS reacted with 3 moles of O₂

Therefore,

4.2 moles of ZnS will react with =(4.2 × 3) / 2 = 6.3 moles of O₂

From the calculations made above, we can see that only 6.3 moles of O₂ out of 6.8 moles given, is required to react completely with 4.2 moles of ZnS.

Thus, ZnS is the limiting reactant and O₂ is the excess reactant.

How to determine the mole of the excess reactant remaining

The excess reactant is O₂. Thus the mole remaining after the reaction can be obtained as illustrated below:

Mole of O₂ given = 6.8 moles

Mole of O₂ that reacted = 6.3 moles

Mole of O₂ remaining =?

Mole of O₂ remaining = (Mole of O₂ given) - (Mole of O₂ that reacted)

Mole of O₂ remaining = 6.8 - 6.3

Mole of O₂ remaining = 0.5 mole

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Answer:

Freezing the liquid

Explanation:

Freezing a liquid causes a liquid to become a soild.

Answer:

changing the temperature of the liquid

Explanation:

Ex. Cooking brownie batter(liquid), turns it into an edible brownie(solid). Ex. Putting water into a freezer freezes it, turning it into a solid.

Answer:

your answer is single replacement reaction or ay+b----> by+a

Answer:

3

Explanation:

begining 0's are never significant

all numbers 1-9 are always significant

ending 0's are only significant when there is

a decimal.

Answer:

it's in the explanation

Explanation:

Lungs- Respiratory

Heart- Circulatory

Brain- Nervous

Stomach- Digestive

Bladder- Excretory

Answer:
Higher pH (more alkaline)

Explanation:

The pH scale measures on a scale of 0 to 14 the acidity or basicness of whatever is being tested.

The lower the pH, the more acidic it will be. Acids are scaled as being anything having a pH of lower than 7.

The higher the pH, the more alkaline (or basic) it will be. Bases are scaled as being anything having a pH of higher than 7.

Substances that are at a pH of 7 are considered neutral, like water (H2O)

Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.

The volume of one nanocontainer is the amount of space it can hold. To find the volume, you need to know the dimensions of the nanocontainer.

If the nanocontainer is a regular shape, such as a cube or a cylinder, you can use the appropriate formula to calculate the volume. For example, the volume of a cube is found by multiplying the length, width, and height of the cube. If the nanocontainer is an irregular shape, you can use water displacement to find the volume. Here's how it works:
1. Fill a graduated cylinder with a known volume of water.
2. Carefully place the nanocontainer into the cylinder, making sure it is fully submerged.
3. Measure the new volume of the water in the graduated cylinder.
4. The difference between the initial and final volume is the volume of the nanocontainer.
Remember to record your measurements accurately to get an accurate volume.

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The equilibrium constant (Keq) for the reaction Cl₂O + 3/2 O₂ (g) ⇌ 2 ClO₂ at 298 K is 1.0 x 10⁻²⁶.

The equilibrium constant (Keq) is determined using the equation Keq = \(\rm e^{(-\Delta G/RT)\), where ΔG is the standard free energy change, R is the gas constant, and T is the temperature in Kelvin. However, in this case, we are given ΔH (enthalpy change) and ΔS (entropy change), so we need to use the equation ΔG = ΔH - TΔS.

Plugging in the given values:

ΔH = 126 kJ/mol = 126,000 J/mol

ΔS = -74.9 J/mol K

T = 298 K

ΔG = ΔH - TΔS

ΔG = 126,000 J/mol - 298 K * (-74.9 J/mol K)

ΔG = 126,000 J/mol + 22,320 J/mol

ΔG = 148,320 J/mol

Now, we can calculate Keq:

Keq = \(\rm e^{(-\Delta G/RT)\)

Keq = \(\rm e^{(-148,320\ J/mol) / (8.314\ J/mol K \times 298\ K))}\)

Keq ≈ 1.0 x 10⁻²⁶

Therefore, At a temperature of 298 K, the equilibrium constant (Keq) for the reaction between Cl₂O and 3/2 O₂ to form 2 ClO₂ is approximately 1.0 x 10⁻²⁶.

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The concentration of the NaOH solution is 10.00 g/dm³.

To calculate the concentration in g/dm³ of a solution of NaOH containing 0.25 moles in 1 dm³, we need to know the molar mass of NaOH.

The molar mass of NaOH is calculated as follows:

Na (Sodium) = 22.99 g/mol

O (Oxygen) = 16.00 g/mol

H (Hydrogen) = 1.01 g/mol

Molar mass of NaOH = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 40.00 g/mol

Now, we can calculate the concentration (C) using the formula:

C = (moles of solute) / (volume of solution in dm³)

C = 0.25 moles / 1 dm³

C = 0.25 mol/dm³

To convert moles to grams, we can multiply the molar mass by the number of moles:

Concentration in g/dm³ = (0.25 mol/dm³) * (40.00 g/mol)

Concentration in g/dm³ = 10.00 g/dm³

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the NaOH concentration is 0.07799 M.

we need to find out the NaOH concentration. For this, we'll use the formula for molarity of a solution. Molarity is defined as moles of solute per litre of solution. The formula for Molarity is:

Molarity (M) = Mass of solute in grams / Molar mass of solute × Volume of solution in liters.

So, we can rearrange the formula as:

M = (m/V) × (1/MW)

where M is the molarity of solution, m is the mass of solute, V is the volume of solution and MW is the molecular weight of the solute. Using this formula, we can calculate the NaOH concentration as follows:

Given, mass of KHP = 0.6986 g

Volume of NaOH = 43.92 mL = 0.04392 L

To find: NaOH concentration

Using the given mass of KHP, we can find the number of moles of KHP as:

moles of KHP = mass / molar mass of KHP= 0.6986 / 204.22= 0.003421 mol

Now, using the balanced chemical equation between NaOH and KHP, we can say that: 1 mole of NaOH reacts with 1 mole of KHP.

This means that the number of moles of NaOH used in the reaction = 0.003421 mol

So, using the formula for molarity, we can say that:

Molarity of NaOH = moles of NaOH / volume of NaOH= 0.003421 / 0.04392= 0.07799 M

Therefore, the NaOH concentration is 0.07799 M.

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Answer:

10 g/cm3

Explanation:

The density is equal to mass/volume

so Mass is 80g

and volume is 2*3=8

so density=80/8=10g/cm3

Answer:

\(\boxed {\boxed {\sf 10 \ g/cm^3}}\)

Explanation:

We are asked to find the density of a cube. The density of a substance is its mass per unit volume. The formula for calculating density is:

\(\rho= \frac{m}{v}\)

We know the mass of the cube is 80 grams. We don't know the volume of the cube, but we can calculate it using the following formula.

The side length (s) of the cube is 2 centimeters. Substitute this value into the formula.

Now we know the mass and volume of the cube. We can substitute the values into the density formula.

\(\rho= \frac{80 \ g }{8 \ cm^3}\)

Divide.

\(\rho= 10 \ g/cm^3\)

The density of the cube is 10 grams per cubic centimeter.

The rate law for the given reaction is k[A][B]^3.

Given reaction is 2A + 3B → Products which is first order in A and third order overall.

To find the rate law we need to use the equation for the third-order reaction which is given as :

k[A]^m[B]^n

where, k is the rate constant

m is the order of the reaction with respect to A (i.e., first order in A)

n is the order of the reaction with respect to B (i.e., third order in B)

By substituting the given values , k[A]^1[B]^3

The order of the reaction with respect to A is 1, so we include [A] to the power of 1, which we can write as [A]^1 or simply as [A]. The order of the reaction with respect to B is 3, so we include [B] to the power of 3, which we can write as [B]^3.

The overall rate law is : k[A][B]^3

Thus, the rate law for the given reaction is k[A][B]^3.

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The correct matches are:

(i) Acid chlorides and esters experience primarily dipole-dipole interactions between their molecules.

(ii) 1º and 2º amides experience primarily hydrogen bonding between their molecules.

(iii) Acid chlorides, esters, and 3º amides have lower boiling points than other carboxylic acid derivatives of similar size and shape.

(iv) 1º and 2º amides have the highest boiling points among other carboxylic acid derivatives of similar size and shape.

i.

Acid chlorides and esters experience primarily dipole-dipole interactions between their molecules due to the presence of polar bonds within the molecules.

ii.

1º and 2º amides experience primarily hydrogen bonding between their molecules, as they contain the necessary hydrogen and oxygen or nitrogen atoms for hydrogen bonding.

iii.

Acid chlorides, esters, and 3º amides have lower boiling points than other carboxylic acid derivatives of similar size and shape. This is due to the absence of hydrogen bonding in these compounds, resulting in weaker intermolecular forces.

iv.

1º and 2º amides have the highest boiling points among other carboxylic acid derivatives of similar size and shape. This is because they can form extensive hydrogen bonding between their molecules, leading to stronger intermolecular forces and higher boiling points.

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Answer:

Explanation:

The number of atoms of Al can be found by using the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 1.5 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

A mixture of molecules is a group of molecules in which there are multiple different elements and atoms, that are in either fixed proportions or random. There are heterogeneous and homogenous mixtures.

Explanation:

At 298 K and 1 atm, Br₂ is a liquid with a high vapor pressure, and Cl₂ is a gas. Forces among Br2 molecules are stronger than those among Cl2 molecules, Therefore, option A is correct.

Pressure of vapor or equilibrium The pressure that a vapor exerts on its condensed phases in a closed system when they are in thermodynamic equilibrium with one another at a specific temperature is known as vapor pressure. A liquid's evaporation rate can be determined by looking at the equilibrium vapor pressure.

Solids, gases, and liquids are the three different states in which matter can exist. Molecules in these states of matter are kept together by attractive forces.

Since liquids have a stronger intermolecular force of attraction than gases do, they are not as mobile as gases.

Thus, option A is correct.

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Answer:

Book on Table

Car at the Hilltop

Falling Objects

Skydiver

Hammering a Nail

Dam Water

Roller Coaster

Stretched Rubber Band

Simple Pendulum

Compressed Spring

Battery

Flashlight

Exothermic Chemical Reaction

Burning of Oil, Gas and Coal

Wind Turbine

Explanation:

have a nice day!