rank substituents in order of their priority when assigning the e or z label to an alkene. you are currently in a ranking module. turn off browse mode or quick nav, tab to move, space or enter to pick up, tab to move items between bins, arrow keys to change the order of items, space or enter to drop. highest priority lowest priority answer bank

0.025 moles of hydroxide ions (OH-) are there in 25.0 mL of 1.00 M NaOH.

We may use the following formula to calculate the number of moles of hydroxide ions (OH-) in 25.0 mL of 1.00 M NaOH:

moles = concentration x volume

First, we need to convert the volume from milliliters to liters, which can be done by dividing by 1000:

25.0 mL = 25.0/1000 = 0.025 L

plugging in the values:

moles of NaOH = concentration x volume = 1.00 mol/L x 0.025 L = 0.025 mol

Since NaOH dissociates completely in water to produce one mole of hydroxide ions for every mole of NaOH, we have:

moles of OH- = 0.025 mol

Therefore, there are 0.025 moles of hydroxide ions (OH-) in 25.0 mL of 1.00 M NaOH.

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Answer: \(136.2\times 10^{23}\) molecules

Explanation:

According to avogadro's law, 1 mole of every substance contains avogadro's number of particles.

To calculate the moles, we use the equation:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}=\frac{1200g}{53.06g/mol}=22.62moles\)

1 mole of acrylonitrile has = \(6.023\times 10^{23}\) molecules

Thus 22.62 moles of  acrylonitrile has = \(\frac{6.023\times 10^{23}}{1}\times 22.62=136.2\times 10^{23}\) molecules

Taking into account the definition of Avogadro's number, 1.36×10²⁵ molecules of C₃H₃N are in 1200 g.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

In this case, you know the molar mass of the elements is:

So, the molar mass of the compound C₃H₃N is calculated as:

C₃H₃N= 3× 12 g/mole + 3× 1 g/mole + 14 g/mole

Solving:

C₃H₃N= 53 g/mole

You have 1200 g of C₃H₃N. So, knowing its molar mass, you can calculate the number of moles that contain a mass of 1200 g as:

1200 g×\(\frac{1 mole}{53 grams} \)= 22.64 moles

Then you can apply the following rule of three: If by definition of Avogadro's number 1 mole of C₃H₃N contains 6.023×10²³ molecules, 22.64 moles of C₃H₃N contains how many molecules?

amount of molecules of C₃H₃N= (22.64 moles × 6.023×10²³ molecules)÷ 1 mole

amount of molecules of C₃H₃N= 1.36×10²⁵ molecules

Finally, 1.36×10²⁵ molecules of C₃H₃N are in 1200 g.

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The number of valence electrons related to an element's chemical properties due to combining capacity of valence electron of elements with other elements.

It depends upon the number of electrons in outermost shell. In simple ionic compound valence is the number of electrons gained or lost by an atom of an element to complete its octet. Element having less than four electrons in their valence shell; prefer to lose of the electrons to complete their octet.

For example, Na, Mg  and Al have 1, 2 and 3 electrons in their valence shells respectively. They lose these electrons to have valency of 1, 2 and 3 respectively. On the other hand elements having five or more than five electrons in their valence shells, gain electrons to complete their octet. For example: N ,O and Cl have 5, 6 and 7 electrons in their valence shells respectively. They gain 3, 2 and 1 electrons respectively to complete their octet.

Hence in this way, number of valence electrons change the chemical properties of elements.

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When we convert 2.50 moles of Na₂SO₄ to mass of NaOH, given the chemical equation, the result obtained is 200 grams

We'll begin by obtaining the moles of NaOH that reacted to produce 2.50 moles of Na₂SO₄. Details below:

CaSO₄ + 2NaOH -> Na₂SO₄ + Ca(OH)₂

From the balanced equation above,

1 mole of Na₂SO₄ was produced from 2 moles of NaOH.

Therefore,

2.50 moles of Na₂SO₄ will be produce from = 2.5 × 2 = 5 moles of NaOH.

Finally, we shall determine the mass of NaOH. Details below:

Mole = mass / molar mass

Cross multiply

Mass = Mole × molar mass

Mass of NaOH = 5 × 40

Mass of NaOH = 200 grams

Thus, the mass of NaOH is 200 grams

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Fossil fuels are formed over millions of years from the remains of dead plants and animals that have been buried under layers of rock and sediment.

These fuels contain stored carbon that was originally absorbed by the plants and animals during their lifetime. Examples of fossil fuels include coal, oil, and natural gas. When these fuels are burned for energy, the carbon is released into the atmosphere in the form of carbon dioxide, which contributes to climate change. Natural gas is a combustible mixture of hydrocarbons and other organic compounds that is found beneath the Earth's surface. Coal is a non-renewable fossil fuel that is used to generate electricity and heat, and is also used in the production of steel, cement, and other industrial products.

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A weak base, ammonia solution will dissociate into: NH3 + H2O. Initial combination: NH4+ + OH- , The pH of a 0.205 M ammonia solutionpH = 11.3

Quite poisonous is ammonia. Lungs, eyes, & skin can become seriously corroded by it. Ammonia poisoning can potentially lethal. Ammonia can injure people permanently by causing blindness and lung issues, for example.

Approximately 80% of a ammonia produced from industry is used as fertilizer in agriculture. In addition to these uses, ammonia is also employed in the production of polymers, explosives, textiles, insecticides, dyes, and other compounds. It also serves as a refrigerant gas.

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simple molecules contain two atom bonded together

Answer:  Simple Molecule

Explanation:  Ambigous question.  What is the scientific definition of "simple molecule?"  More by process of elimination than actual difinition, this is a simple molecule.  It takes a minum of two atoms to make a molecule (by definition).  A crystal is a collection of molecules, a polymer is a chain of molecules, and a complex molecule is, er  . ., complex.  The only reasonable, and best, answer is "simple molecule."

The combine mass of the sled and the rider, given that each dog pulled with a force of 30 N is 200 Kg

We know that force is related to mass and acceleration according to the following formula:

Force (F) = mass (m) × acceleration (a)

F = ma

With the above formula, we can determine the combined mass of the sled and rider. Details below.

From the question given above, the following data were obtained:

The combined mass can be obtained as follow:

Force = mass × acceleration

240 = mass × 1.2

Divide both sides by 1.2

Mass = 240 / 1.2

Mass = 200 Kg

Thus, the combine mass is 200 Kg

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Answer:

Shampoo

Explanation:

Its a homo mixture because if you look at the way it is mixed you will

know it is a homogeneous mixture

Answer:

Reflection takes place from the polished smooth surfaces

Explanation:

A vacuum does not refer to an opaque body. An opaque body does not allow light to pass through it while a vacuum is simply empty space without air.

A smooth polished surface often acts as a mirror, it is a good reflector of light.

The moon is a non luminous body in the sky. It merely reflects the light from the sun.

A Pinhole camera can not take pictures of moving objects because it only focuses on any image placed before it.

Shadows are not inverted, the always appear upright.

Answer:

A spatial pattern is a perceptual structure, placement, or arrangement of objects on Earth. It also includes the space in between those objects. Patterns may be recognized because of their arrangement; maybe in a line or by a clustering of points.

Explanation:

The element that is able to form a divalent negative ion in the list is selenium. Option A

We know that an ion can be formed when there is the loss or gain of electrons from an atom. When electrons are lost from atom what we have is a positive ion and when electrons are gained in an atom what we have is a negative ion.

The magnitude of the charge on the ion would have to do with the number of the electrons that have been lost or gained by the atom that we are looking at.

We know that a divalent negative ion can be formed by the atoms that belong to group sixteen of the periodic table hence we look out for the members of that group and a typical example of that is selenium. This element is one of the elements found in group sixteen.

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Answer:

23.5 %

Explanation:

La fórmula del ácido sulfúrico es H₂SO₄, mientras que su masa molar es de 98 g/mol.

Siendo la densidad 1.4 g/mL, quiere decir que en 1 mL de solución tenemos 1.4 g de solución. Como la concentración es de 330 g/L entendemos que la solución contiene 330 gramos de soluto en 1L de solución.

Entonces en 1000 mL de solución (lo que equivale a 1 litro), tendremos:

1.4 g/mL = masa de solución / 1000 mL

masa de solución = 1.4 g/mL . 1000 mL =  1400 g

Como % en masa es la concentración que define la masa de soluto en 100 gramos  de solución, para esta solución de H₂SO₄ es:

(330 g / 1400 g) . 100 = 23.5 %

Explanation:

49.31 + 43.79 = 93.10

finding the percentage of hydrogen in the compound hence 100-93.10 =6.9

therefore 6.9 percent of hydrogen is present in the compound

assuming that the compound is in 100 g so the elements present would be 49.31g of C , 43.79g of O and 6.9g of H

no. of moles of C = given mass÷molar mass

= 49.31 ÷ 12

=4.11 mol

no of moles of O = givem mass ÷molar mass

=43.79÷ 16

=2.73 mol

no. of moles of H =6.9÷1

=6.9 mol

dividing the no. of moles of each element by the least count of the elemnt to get the ratio of the simple whole numbr

therefore

so by dividing we get 1:1:2 of C:O:H

the empirical formula is CH2O

empirical formula mass of CH2O IS

= (12)+(2×1)+(16)

= 12+2+16

=30 G/MOL

n= molar mass of the compound ÷ empirical formula mass of the compound

so, n= 146.1 ÷30

n=5

molecular formula = n×empirical formula

molecular formula= 5×CH2O

molecular formula=C5H10O5 (ribose is the compound)

A hydrogen-filled balloon is ignited and 2.60 g of hydrogen reacts with 20.8 g of oxygen. 23.18 grams of water vapor form.

The reaction between hydrogen and oxygen yields water vapor (H2O). Thus, when a hydrogen-filled balloon is ignited and 2.60 g of hydrogen reacts with 20.8 g of oxygen, we can calculate the amount of water vapor produced as follows: Reaction equation:

H2(g) + O2(g) → H2O(g)

The molar mass of H2 = 2.02 g/mol

The molar mass of O2 = 32 g/mol

The molar mass of H2O = 18.02 g/mol

From the equation, we can see that the stoichiometric ratio of H2 to O2 to H2O is 2:1:2. This means that for every 2 moles of H2 that react, 1 mole of O2 reacts, and 2 moles of H2O are produced. Using the molar masses and the stoichiometric ratios, we can find the amount of water vapor produced as follows:

Mass of H2 = 2.60 g

Number of moles of H2 = mass / molar mass

= 2.60 g / 2.02 g/mol = 1.2871 mol

Number of moles of O2 = (1/2) × number of moles of H2

= (1/2) × 1.2871 mol = 0.6435 mol

The number of moles of H2O = the number of moles of H2 = 1.2871 mol

Mass of H2O = the number of moles × molar mass = 1.2871 mol × 18.02 g/mol = 23.18

Therefore, 23.18 grams of water vapor form.

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Answer:

There are billions of galaxies in the universe, not just one.

The universe formed from a central point.

Most galaxies in the universe are moving away from Earth.

Explanation:

Answer:

Teeth gridning

Explanation:

BC YOUR GRINDING IT

Answer:

2. Distillation Flask

3. Fractionating column

4. Thermometer

5. Condenser

6. cold water in

7. cold water out

8. Recieving flask

13. Electric heater

According to the web:

1. "In a collision, there is a force on both objects that causes an acceleration of both objects; the forces are equal in magnitude and opposite in direction. For collisions between equal-mass objects, each object experiences the same acceleration."

2. "If object A is in motion, collides with object B at rest, then the system will have some momentum due to motion of object A. Now after collision let us imagine the object becomes at rest, and object B comes to motion. This means the object B has some momentum making the system to have momentum."

WARNING: PLAGIARISM IS A REAL THING AND CAN AFFECT YOUR EDUCATION, THAT IS WHY I HAVE PLACED DOWN MY SOURCE SO THAT YOU DO NOT GET IN TROUBLE. DO NOT COPY THIS ANSWER WORD FOR WORD ON YOUR HOMEWORK. USE THIS AS A SOURCE, AND MAKE IT YOUR OWN:

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Answer:

Difference in temperature.

Explanation:

Conduction is the movement of heat energy through a substance or from one substance to another by direct contact of atoms and molecules. Heat moves directly from one molecule to another. The heat energy speeds up the movement of the atoms and they collide with other molecules setting them into faster motion.

Answer:

1: X and Y

2: A

Explanation:

Answer:

R = 8.314 pKa*L/mol*K

The value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

To determine the value for the ideal gas constant (R) when pressure (P) is in kilopascals (kPa), temperature (T) is in kelvins (K), volume (V) is in liters (L), and amount of gas (n) is in moles, we need to use the appropriate units for R based on these measurements.

The ideal gas constant, R, can be expressed in various units. The most common units for R are:

R = 0.0821 L·atm/(mol·K) (atmospheres, liters, moles, and kelvins)

However, since you provided the measurements in kilopascals, liters, moles, and kelvins, we need to use a different value for R that is consistent with these units:

R = 8.314 kPa·L/(mol·K)

Therefore, when pressure is in kilopascals, volume is in liters, amount of gas is in moles, and temperature is in kelvins, the value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

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Explanation:

Element: Carbon

Mass number: 12

atomic number: 6

No of protons : 6

At the transition stage, one form of matter starts getting converted into another form of matter.

Solid, liquid and gas are the three phases in which matter occur in nature. Matter is interconvertible in nature i.e it can be converted from one form to another.

Melting, freezing and evaporation are the three phases of transition.

Liquid water at low temperature freezes to form solid ice. This process is known as freezing. Whereas, liquid water when provided high temperature or heat releases vapours. This process is known as evaporation. Solid ice when brought at room temperature gets converted back into liquid water. This process is known as melting.

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To determine which cubic unit cell strontium (Sr) crystallizes in, we need to calculate its atomic packing factor (APF) for each of the three cubic unit cells:



simple cubic (SC), body-centered cubic (BCC), and face-centered cubic (FCC).The APF is the fraction of space in a unit cell that is occupied by atoms. It is calculated as follows:APF = (number of atoms in a unit cell x volume of each atom) / volume of the unit cellFor a cubic unit cell, the volume of the unit cell is given by:volume of unit cell = a^3where a is the length of the side of the cube.For a simple cubic unit cell, there is only one atom at each corner of the cube. The length of the side of the cube (a) is equal to twice the atomic radius (2r). Therefore, the volume of each atom is:volume of atom = (4/3) x pi x r^3 = (4/3) x pi x (216.3 pm)^3 = 2.613 x 10^-23 cm^3The volume of the unit cell is:volume of unit cell = a^3 = (2r)^3 = 8 x (216.3 pm)^3 = 9.295 x 10^-22 cm^3The number of atoms in a simple cubic unit cell is 1, so the APF is:APF = (1 x 2.613 x 10^-23 cm^3) / (9.295 x 10^-22 cm^3) = 0.281For a body-centered cubic unit cell, there is one atom at each corner of the cube and one atom at the center of the cube. The length of the side of the cube (a) is equal to four times the atomic radius (4r/√3). Therefore, the volume of each atom is:volume of atom = (4/3) x pi x r^3 = (4/3) x pi x (216.3 pm)^3 = 2.613 x 10^-23 cm^3The volume of the unit cell is:volume of unit cell = a^3 = (4r/√3)^3 = (64/3) x (216.3 pm)^3 = 6.452 x 10^-22 cm^3The number of atoms in a body-centered cubic unit cell is 2, so the APF is:APF = (2 x 2.613 x 10^-23 cm^3) / (6.452 x 10^-22 cm^3) = 0.68For a face-centered cubic unit cell, there is one atom at each corner of the cube and one atom at the center of each face of the cube. The length of the side of the cube (a) is equal to two times the square root of two times the atomic radius (2√2r). Therefore, the volume of each atom is:volume of atom = (4/3) x pi x r^3 = (4/3) x pi x (216.3 pm)^3 = 2.613 x 10^-23 cm^3The volume of the unit cell is:volume of unit cell = a^3 = (2√2r)^3 = 32 x (216.3 pm)^3 = 1.238 x 10^-21 cm^3The number of atoms in a face-centered cubic unit cell is 4, so the APF is:APF = (4 x 2.613 x 10



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The test statistic is 2.08. Since the calculated test statistic (z = 2.08) falls in the rejection region (z > 1.645), we reject the null hypothesis.

(i) Alternative hypothesis: Ha: μ > 11 kg per kilometre (there is a significant difference between the sample and population mean)Where μ represents the population mean carbon dioxide (CO2) per kilometre.

(ii) The test statistic is given by

: z = (X - μ) / (σ / √n)

Where X = sample mean

= 12 kg per kilometre

μ = population

mean = 11 kg per kilometre

σ = population standard deviation

= 2.5 kg per kilometre

n sample size = 41

Therefore, z = (12 - 11) / (2.5 / √41)

= 2.08

(iii) Using a significance level of 5%, the rejection region is given by z > 1.645

(iv)This means that there is strong evidence that the airline has failed to attain their CO2 emission goal at a significance level of 5%.

(v) The 95% confidence interval is given by:

X ± zα/2(σ / √n) = 12 ± 1.96(2.5 / √41)

= (11.29, 12.71)

This means that we can be 95% confident that the true population mean carbon dioxide (CO2) per kilometre falls within the interval (11.29, 12.71) kg per kilometre.

(vi) The assumptions made when conducting the hypothesis test and confidence interval are:1. The sample is a random sample from the population2.

The population follows a normal distribution or the sample size is sufficiently large (n > 30)The normality assumption can be checked using a normal probability plot or a histogram. If the plot/histogram shows a roughly bell-shaped distribution, the normality assumption is met. Otherwise, the sample size can be checked. If the sample size is greater than 30, the central limit theorem can be used to approximate a normal distribution.

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Answer:

The correct option is -286 kJ

Explanation:

The given parameters are

C(s) + O₂(g) → CO₂(g)   ΔHf = -394 kJ

H₂(g) + 12O₂(g)→H₂O ΔHf = -242 kJ

2C(s) + 3H₂(g)→C₂H₆(g)  ΔH = -84 kJ

Te given equation is C₂H₆(g) + 7/2O₂(g) →2CO₂(g) + 3H₂O(l)

The heat of formation or enthalpy of combustion = Heat of formation of the products - Heat of formation of the reactants

The enthalpy of combustion of the reaction = 2*(-394) + 3*(-242)- ((-84)+7/2*0)) = -1,430 kJ

Given that the reaction consists of one mole of C₂H₆(g), we have;

The enthalpy of combustion of one mole of C₂H₆(g) = -1,430 kJ

Therefore, the enthalpy of combustion of 0.2 mole of C₂H₆(g) = -1,430 kJ × 0.2 = -286 kJ

The correct option = -286 kJ.

Answer:

Positive 1,430

Explanation: