when an open cup of water sits in a table, it will evaporate over gime. do all liquids evaporate at the same rate? suppose you conduct an experiment to see how quickly water, rubbing alcohol and bail polish remover evaporate. describe theee important techniques you will have to follow to make sure your experminal procedure is repeatable and objective.

A selenide ion is the isoelectronic with the noble gas is the correct option is d. krypton.

The atomic number of the selenide is 34. The electronic configuration of the selenide is as :

Electronic configuration of selenide = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴

The selenide ion is Se²⁻, this means that the selenide ion gains the two electron and form the anion. The electronic configuration for the selenide ion is as :

Electronic configuration of Se²⁻ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ or [Kr]

The atomic number of the krypton is 36. Therefore the selenide ion is isoelectronic with the krypton.

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Answer:

Bent = Linear but bent due to the Lone Pairs that it contains, the more Lone Pairs the greater the bent and the smaller the degree. It is 3 atoms total.

The discussion on bent/linear shape, and its further calculation can be defined as follows:

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20g of oxygen is required to react with 13g of acetylene.

The simplest alkyne chemical molecule, known as acetylene chemically, is C2H2.

C2H2.Ethyne, Narcylen, and Vinylene are other names for acetylene. It is frequently employed as a fuel and a component of chemical compounds. It is handled as a solution even though it is unstable in its pure state. The compound's two carbon atoms are joined by a double bond, making it an unsaturated one.

Acetylene is used in brazing. Used in the glass industry. in the manufacturing of synthetic rubber ,in soldering metal.Used as an additive to preserve food. to precipitate metals. Used to manufacture acetic acid. Used as a feedstock in the manufacturing of acrylonitrile.Used in carburization of steel. Used as a fuel additive.

Given,

acetylene (c2h2) burns in pure oxygen with a very hot flame.

the products of this reaction are carbon dioxide and water.

The balanced chemical reaction is given by,

2C2H2 + 5O2 --> 4CO2 + 2H2O

Here,

52g of acetylene react with 80g of oxygen.

1g of acetylene react with (80/52)g of oxygen.

thus, 13g of acetylene react with (80×13)/52 g of oxygen

the amount of oxygen required to react with 13g of acetylene = 20g

Hence , 20g of oxygen is required to react with 13g of acetylene.

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Answer:

It has four main components: plasma, red blood cells, white blood cells, and platelets.

Answer:

Two orher components of blood are plasma and platelets.

Answer:

1.5 moles

Explanation:

The equation of the reaction is given as:

2 MnO2 + 4 KOH + O2 --> 2KMnO 4 + 2KOH + H2

From the equation,

2 moles of MnO2 produces 2 moles of KMnO4

x moles of MnO2 would produce 1.5 moles of KMnO4

2 = 2

x = 1.5

Solving for x;

x = 1.5 * 2 / 2

x = 1.5 moles

Answer:

Explanation:

...............

........

C is the choice that is a crystalline solid with a covalent network (diamond).

Solid may seem like a straightforward term at first appearance, but it actually has a variety of meanings. A reliable buddy is trustworthy. It was pretty excellent, but not amazing, if you deliver a strong performance. Likewise, if you succeed in winning convincingly, you do it by a sizable but not overwhelming margin.

A solid is distinguished by its reinforcing and resilience to external forces. A solid substance, unlike a liquid, somehow doesn't flow to conform to the form of its container or, like a gas, expand to cover the entire space.

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Answer:

I think that temperature will be cut in half.

When volume increases, pressure decreases. As pressure decreases, temperature decreases. So if you double volume, pressure is halved and so will the temperature. I'm new to this, but I think that's the answer . Tell me if I'm right good luck!

Answer:

hope this is help helpful

Explanation:

natural gas are considered nonrenewable because they can not be replenished in a short period of time.

Answer:

The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.

Explanation:

Answer:

Identify the disaccharide that fits each of the following descriptions: a. not a reducing sugar b. composed of two glucose units c. also called milk sugar d. hydrolysis gives glucose and fructose

Burning and other changes in matter do not destroy matter. The mass of matter is always the same before and after the changes occur. The law of conservation of mass states that matter cannot be created or destroyed

The thing that is happen in a food sample as it is burned is the chemical and physical change.

Comubustion reactions are those reactions in which organic compound get burnt in the presence of oxygen for the formation of carbon dioxide gas and water molecule.

If the food sample contains the organic compound then it will convert into water and carbon dioxide gas and if it contains the matter in the form of inorganic compounds then it will convert into another product but having the same mass.

Hence if matter of food sample is burned then it will convert into small products as a result of physical or chemical change.

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Answer:

The length of the bond is determined by the number of bonded electrons (the bond order). The higher the bond order, the stronger the pull between the two atoms and the shorter the bond length. Generally, the length of the bond between two atoms is approximately the sum of the covalent radii of the two atoms.

Answer:

Turning the lights off when they're not needed.

The principle of option D. Uniformitarianism states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the

Option D. Uniformitarianism is the principle stating that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past. It is based on the idea that the present is the key to the past. In other words, the same natural laws that operate in the universe today have been operating since the beginning of time.

James Hutton was the first to propose this principle in the late 18th century. He suggested that the Earth was shaped by slow-acting geological forces such as erosion, sedimentation, and uplift over long periods of time. He believed that the same processes were still happening today and that they had operated in the past.

This principle is an important concept in geology because it allows scientists to interpret the Earth's history based on the processes that they observe today. By understanding how these processes work and how they have changed over time, scientists can reconstruct the history of the Earth and its environments.

Uniformitarianism has been tested and proven through many observations and experiments. For example, the study of sedimentary rocks has shown that they were formed in the past through the same processes that are observed today, such as deposition of sediment by water, wind, or ice.

Similarly, the study of volcanoes has shown that they are formed by the same processes as today, such as the movement of magma from deep within the Earth.

In conclusion, Uniformitarianism is the principle that allows us to interpret the Earth's history by observing the processes that shape it today. It is a fundamental concept in geology and has been tested and proven through many observations and experiments.

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When given 20.76 moles of H2 and plenty of O2, you can make 20.76 moles of H2O.

To determine how many moles of H2O can be produced from 20.76 moles of H2 and plenty of O2, we'll use the balanced chemical equation provided: 2H2 + 1O2 --> 2H2O.

Step 1: Identify the limiting reactant. In this case, we have plenty of O2, so H2 is the limiting reactant.

Step 2: Determine the mole ratio between the limiting reactant (H2) and the product (H2O). According to the balanced equation, the mole ratio is 2H2 to 2H2O, or 1:1.

Step 3: Calculate the moles of H2O produced. Since the mole ratio is 1:1, the number of moles of H2O produced will be the same as the number of moles of H2 available. Thus, you can produce 20.76 moles of H2O.

In summary, when given 20.76 moles of H2 and plenty of O2, you can make 20.76 moles of H2O.

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Answer:

C - Mass and Volume

Explanation:

Answer:

c,3

Explanation:

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There are 0.0267255 moles of KBr present in 153 ml of a 0.175 m solution.

To find the moles of KBr present in 153 ml of a 0.175 m solution, we can use the formula for molarity:

Molarity (M) = moles of solute ÷ liters of solution

We are given the following information:

Volume of solution (V) = 153 ml = 0.153 L

Concentration of solution (M) = 0.175 m

Let's solve for the moles of KBr:

0.175 m = moles of KBr ÷ 0.153 L

moles of KBr = 0.175 m × 0.153 L

moles of KBr = 0.0267255 mol

Therefore, there are 0.0267255 moles of KBr present in 153 ml of a 0.175 m solution.

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Pentanol (C₅H₁₁OH; M = 88.15 g/mol) has nearly the same molar mass as hexane (C₆H₁₄; M = 86.17 g/mol) but is more than 12 times as viscous at 20°C because Given that both are of comparable sizes and shapes, the London forces ought to be comparable. Because of the hydrogen bonds formed by the -OH groups at the ends of the molecules, 1-pentanol is much more viscous.

H-bonds are known to have stronger intermolecular forces than dispersion forces. Thus, pentanol is 12 times more viscous than hexane at 20 C as a result of larger intermolecular interactions. It has a low heat of vaporization and low viscosity. Hexane's main drawbacks are that it is flammable and handling it requires special safety measures.

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Answer:

High amount of humidity

Explanation:

This is especially common in the Caribbean, where hot temperatures very moisture and warm air provide near-ideal circumstances for hurricane formation, as assessed by the Saffir-Simpson classification and the Power Distribution Index.

"Hurricanes may originate everywhere in the Atlantic basin, from the subtropical central Atlantic to the Gulf coast. However, in order to make this all the way to the West Coast of the United States, the storms must pass over a lengthy length of sea water which is far too small to support hurricanes.

The storm strength is influenced by a lot of factors. Due to world warms and increase in the amount of humidity.

What is causing the increase in storm strength?

Studies has shown due too the warming of the world, hurricanes and other tropical cyclones are said to be more stronger.

This is due to the fact that warmer water gives more of the energy that boast storms. A rise in stronger hurricanes is due to warming never ending.

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The equation of the reaction is \(2PbS + 3O_{2} --- > 2Pb + 2SO_{3}\) and the mass of lead produced is 2.28 g

The term equation is the means by which we could be able to represent what is going on in the reaction system on a piece of paper. Thus, when we write a reaction equation, it is a representation of the process that is going on in the system. By the use of the stoichiometry of the reaction we could obtain the parameters of the equation.

The balanced reaction equation is; \(2PbS + 3O_{2} --- > 2Pb + 2SO_{3}\).

Number of moles of lead (II) sulfide = 2.54 grams/239 g/mol = 0.011 moles

Number of moles of oxygen =  1.88 g/32 g/mol = 0.059 moles

If 2 moles of  lead (II) sulfide reacts with 3 moles of oxygen

0.011 moles of  lead (II) sulfide reacts with  0.011 moles  *  3 moles /2 moles

= 0.0017 moles

Hence  lead (II) sulfide is the limiting reactant.

If 2 moles of lead (II) sulfide produces 2 moles of lead

Mass of the Lead produced =   0.011 moles * 207 g/mol = 2.28 g

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Answer:

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The equilibrium constant (K) for the given reaction at 25°C is approximately 151.6.

To determine the equilibrium constant (K) for a reaction using the standard Gibbs free energy (∆G°), we can use the equation:

∆G° = -RT ln(K)

Where:

∆G° is the standard Gibbs free energy (-12.6 kJ in this case),

R is the gas constant (8.314 J/mol·K),

T is the temperature in Kelvin (25°C = 298 K),

K is the equilibrium constant we want to calculate.

First, we need to convert the given ∆G° from kilojoules to joules:

∆G° = -12.6 kJ * 1000 J/kJ = -12,600 J

Now we can substitute the values into the equation and solve for K:

-12,600 J = -8.314 J/mol·K * 298 K * ln(K)

Dividing both sides by (-8.314 J/mol·K * 298 K):

ln(K) = -12,600 J / (-8.314 J/mol·K * 298 K)

Calculating the right side of the equation:

ln(K) ≈ 5.023

Now, we can take the exponent of both sides to find K:

K ≈ e^(5.023)

Using a calculator, we find:

K ≈ 151.6

Therefore, the equilibrium constant (K) for the given reaction at 25°C is approximately 151.6.

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To design an electrolytic cell using the given half-reactions, we need to connect the two half-cells through a wire and allow the flow of electrons from the more negative E° value (-0.25 V) to the more positive E° value (-1.57 V).

In this case, Ni2+ will plate out (form a solid) at the cathode because it has a more negative E° value (-0.25 V) compared to Ba2+ (-1.57 V). This means that Ni2+ ions will accept electrons from the cathode and get reduced to Ni metal.

At the anode, Ba will be oxidized to Ba2+ ions as it has a more positive E° value (-1.57 V) compared to Ni2+ (-0.25 V). This means that Ba atoms will lose electrons and form Ba2+ ions, which will then move towards the cathode to get reduced to Ba metal. However, since Ni2+ is more likely to accept electrons at the cathode, Ba will not plate out as a solid.
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Answer:

6.02 x 10²³ electrons

Explanation:

Given parameters:

Mass of H₂  = 2g

Unknown:

Number of electrons = ?

Solution:

To find the number of electrons, we must determine the number of moles of H₂ first.

 Number of moles  = \(\frac{mass}{molar mass}\)  

  Molar mass of H₂   = 2(1)  = 2g/mol

Number of moles  = \(\frac{2}{2}\)   = 1mol  

1 mole of a substance contains 6.02 x 10²³ particles

the particles can be protons, neutrons, electrons

So,

  2g of H₂ will contain 6.02 x 10²³ electrons.

i have no idea  can somebody help me too

Mitosis is conventionally divided into 5 phases, which include prophase, prometaphase, metaphase, anaphase and telophase and cytokinesis.

Interphase

Before coming into mitosis, a mobile spends a length of its increase underneath interphase.

Prophase

Prophase straight away follows the S and G2 levels of the cycle and is marked by way of condensation of the genetic fabric to form compact mitotic chromosomes composed of  chromatids attached at the centromere.

Prometaphase

In the prometaphase, the nuclear envelop disintegrates. Now the microtubules are allowed to extend from the centromere to the chromosome.

Metaphase

At this level, the microtubules start pulling the chromosomes with equal pressure and the chromosome ends up in the center of the cell. This area is referred to as the metaphase plate.

Anaphase

The splitting of the sister chromatids marks the onset of anaphase. These sister chromatids end up the chromosome of the daughter nuclei.

Telophase

The chromosomes that cluster at the two poles start coalescing into an undifferentiated mass, because the nuclear envelope begins forming round it.

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