which of the following mixtures can be separated by sieving

There are 3.01 × 10¹⁷ moles of AlCl₃ in 1.81 × 10⁴¹ molecules of AlCl₃.

The moles of a substance can be calculated by dividing the number of molecules in the substance by Avogadro's number as follows:

no of moles = no of molecules ÷ 6.02 × 10²³

According to this question, there are 1.81 × 10⁴¹ molecules of AlCl₃. The number of moles in this substance can be calculated as follows;

no of moles = 1.81 × 10⁴¹ ÷ 6.02 × 10²³

no of moles = 0.301 × 10¹⁸

no of moles = 3.01 × 10¹⁷ moles

Therefore, there are 3.01 × 10¹⁷ moles of AlCl₃ in 1.81 × 10⁴¹ molecules of AlCl₃.

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Answer:

17.3178 g

Explanation:

n= m/Mr

m= n x Mr

n= 0.540

Mr of S =32.07

m = 0.540 x 32.07

m= 17.3178 g

484.11 feet

Charlotte is driving at 67.5 mi/h

She looks down at her phone and takes her eyes off the road for 4.89 s

so from the above statements, we got

speed of car =  67.5 mi/h

time = 4.89 s

we have to tell distance

so, from the formula

distance = speed * time

let us first convert speed from mi/h to feet/s

1 mile = 5280 feet

1 hour = 3600 sec

speed =  67.5 * 5280/3600

speed = 356,400/3600

speed = 99 feet/s

distance = 99 feet/s *  4.89 s

distance = 484.11 feet

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100 g of Glutaronitrile contains 63.81 % C, 6.42 % H, and 29.77 5 N by mass. The molar mass of carbon is 12 g/ mol, hydrogen is 1 g/ mol and the molar mass of Nitrogen is 14 g/ mol.

The chemical formula of a compound shows the number of atoms in the formula.

The number of moles of carbon present is 63.81/ 12 = 5.31 mol

The number of moles of hydrogen present is 6.42/ 1= 6.42 mol

The number of moles of Nitrogen present is 29.77/ 14 = 2.12 mol

Hence, the molar ratio   C:H :N = 5: 6: 2

The empirical formula of Glutaronitrile is C5H6N2.

Therefore, 100 g of Glutaronitrile contains 63.81 % C, 6.42 % H, and 29.77 5 N by mass. The molar mass of carbon is 12 g/ mol, hydrogen is 1 g/ mol and the molar mass of Nitrogen is 14 g/ mol.

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The cation is smaller.

A lithium atom is said to be oxidized when it loses an electron and becomes a positive ion. When lithium forms chemical compounds with other elements, it loses an electron from each lithium atom and becomes a Li+ cation. These are then attracted to the negatively charged anions of ionic compounds.

When an atom loses an electron, it forms a positive ion. The number of protons in a positive ion is greater than the number of electrons. Therefore, the attractive force between the electron and the nucleus increases, reducing the atomic radius. Therefore, the size of atoms is larger than that of cations. A cation is always smaller than its parent atom because its nuclear charge remains the same and it has fewer electrons.

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(C) The lithium cation is smaller than the lithium atom.

The electronic configuration of the Lithium atom is given as:

1s² 2s¹ and the electronic configuration of Lithium cation is 1s².

The Lithium Cation is smaller because,

Less Energy Levels: As shown in electrical configurations, the Li atom's valence shell is 2 while the Li cations is 1, resulting in a closer spacing between the valence electrons and nucleus and smaller size.

Less Shielding Effect: The shielding effect is the protection provided by the core electrons to the valence electron from the nucleus pull. Since there are no core electrons in a cation of lithium, the electrons are more drawn to the protons, which causes them to be tiny.

More nuclear charge: The Li atom has three protons and three electrons. As a result, the game is slightly balanced because the three protons attract the three electrons. However, as the tone electron in the Li Cation is removed, the proton side becomes stronger and exerts more force on the electrons, bringing them closer to the nucleus and reducing their size.

Hence, the cation is smaller.

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Answer:

They have same volume

Explanation:

[tex]{ \tt{volume = \frac{mass}{density} }} \\ [/tex]

These objects will have the same volume (amount of space occupied) irrespective of their shapes. This occurs if only occupy fluids of the same density.

Answer:

392 grams

Explanation:

Begin by finding the molar mass. You do this by adding the atomic mass of each element in the compound.

So, add 4(12)+8(1)=56 grams C4H8

Next, set up an equation.

We start with 7 moles of C4H8, and we want to convert moles to grams. We will use the molar mass for that.

So 7mol C4H8/1 x 56grams C4H8 per/1 mole C4H8= 392 grams of C4H8 per seven moles of C4H8

The fact that both emphasize how crucial it is to plan ahead for lab experiments is one connection between the two sections.

How do you get ready for the lab?

We are aware that we conduct experiments in a laboratory. The majority of the experiments we conduct in the lab are either designed to support or refute a hypothesis. We conduct experiments from time to time to ascertain a scientific law.

We now need to think about the sections "Dressing for the Lab" and Making a Plan and Staying Focused." Dressing for lab prepares us for any accident or mishap that might take place while performing our experiment. Making a plan and staying focused emphasizes the fact that we must be prepared with what action plan or steps we have to follow and what equipment and material are required for the experiment.

Therefore, the fact that both emphasize how crucial it is to plan ahead for lab experiments is one connection between the two sections.

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The pair of compounds with same empirical formula will be CH3 and C2H6

Empirical formula of a specific compound is defined as the positive integer ratio of atoms that can be found in that specific compound.

Therefore, from the given option above,

The pair of compounds has the same empirical formula is

CH3 and C3H6

The empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.

The empirical formula of a compound can be exemplified using sulfur monoxide, which would simply be SO, as is the empirical formula of disulfur dioxide, S₂O₂.

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CH3 and C2H6 will be the compounds that have the same empirical formula one another. Option B

The positive integer ratio of atoms that can be found in a certain compound is what is meant to be understood when speaking about the empirical formula of that particular chemical.

Therefore, based on the alternative presented before,

The empirical formulas of the two compounds are identical to one another.

CH3 as well as C3H6

The empirical formula of a chemical compound is the most straightforward representation of the atomic number distribution in the molecule as a whole.

An example of an empirical formula for a molecule is the chemical symbol SO, which stands for sulfur monoxide. Another example is the empirical formula for disulfur dioxide, which is written as S2O2.

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Answer: He concluded  it was dense but not massive

Explanation: Rutherford concluded that his metal foil experiment was that most of an atom was empty-spaced with a tiny, dense, positively charged nucleus at the center that contains the mass of most atoms.

Hope this Helps u3u

The balanced chemical equation for the decomposition is 2 KClO3 (s) ---> 2 KCl (s) + 3 O2 (g)  and the amount of potassium chlorate decomposed is 609.12 g KClO3

On using MnO2 as a catalyst, when potassium chlorate (KClO3) is heated, it breaks down to form potassium chloride and oxygen gas.

Balanced equation of decomposition is given by-

2KClO3-->2KCl+3O2

Given data ;

Actual yield = 83.2 %

Oxygen produced = 198.5 g

Amount of oxygen

= ( 198.5 g O2 / 0.832 )

= 238.58 g O2

So, potassium chlorate decomposed

= 238.58 g O2 × (1 mol O2 / 32 g O2 ) ×( 2 mol KClO3 / 3 mol O2 ) × ( 122.55 g KClO3 / 1 mol KClO3 )

=  609.12 g KClO3

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The current mass of 206Pb per 1.305g of 238U in the rock is 1.037 grams

To be able to solve this question, we need to know the rate constant and the half-life of the radioactive isotope.

What is the rate constant?

From the first order of kinetics, the rate constant is the proportionality constant in relation to the half-life.

It can be expressed by using the formula:

Now, from the parameters given:

The mass of 238U = 1.300 g

Suppose we assume that the mass of 206Pb = x

Therefore, the equation for the decay constant can be computed as:

x = 2.503 - 1.300

x = 1.203

Now, the mass of the 206Pb is calculated as:

= 1.203 grams

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The molar concentration of the dilute solution is 0.086m.

To calculate the dilute concentration when a stock solution is provided we use the Dilution Equation.

Equation = M₁V₁ = M₂V₂

Where M₁ is the initial molarity (given)

V₁ is the initial volume (given)

M₂ is the final molarity (which needs to be calculated)

V₂ is the total volume (given)

Therefore, M₂ = M₁ ×V₁ ÷ V₂ = 0.086m

The molecular concentration of the diluted solution is 0.086m.

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The standard free energy change for the following reaction  is -16.7 KJ/mo

Glucose+ ATP ⇒   glucose 6-phosphate + ADP

this is the reaction given

Glucose +Pi   ⇒    glucose 6-phosphate      ΔG°    = 13.8kj/mol

ATP       ⇒         ADP + Pi                             ΔG° = -30.5 KJ/mol

The desired reaction can be obtained by adding the two reaction given in the statement.

So the standard free energy change of the desired reaction is given by adding the standard free energy change of both these reactions.

So here :

= 13.8 KJ/mol + (-30.5 KJ/mol)

= -16.7 KJ/mol

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Answer:

7.2km/h.

Explanation:

Therefore, we get the speed of the man crossing a 600m long street in 5 minutes as 7.2km/h.

as per the given values ,ph of this solution is 13.18

We have  [OH−]=1.49 x10⁻¹ M 

Using formula, the  pOH is

:pOH=−log[OH−]

          =−log(1.49 x10⁻¹ M)≈ 0.82

Now, at any temperature, pH+pOH=pKw 

.Assuming standard conditions,  pKw=14 .

As such, the pH is ==> pH+pOH=pKw

                        pH=pKw−pOH

                              =14-0.82

                              ≈13.18

pH is a measure of  acidic/basic nature of solution . It ranges  from 0 - 14, with 7 being neutral. pH of less than 7 means  acidity, whereas a pH of greater than 7  basic solution . pH is  a measure of the relative amount of free hydrogen and hydroxyl ions in the water
.
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received a hurricane warning its is safer to travel inland to avoid the storm

First, leave the area if instructed to do so or if you believe it would be harmful for you to stay in your house. Depending on the hurricane and its projected path, the terrain and elevation, and the caliber of your shelter, you should move 50 to 200 miles inland. By doing this, you will be sheltered from the strongest winds and the ensuing coastal storm surge. Because hurricane courses are unpredictable and because storm surge and wind can harm coastal roads and traffic signals well before a hurricane makes landfall, it is typically not a good idea to drive along the shore, with the exception of getting to a road that leads inland. Be aware that hurricanes have a more hazardous quadrant for wind intensity, which for hurricanes in the Gulf of Mexico and the Atlantic Ocean in our northern hemisphere is the upper left, northwestern quadrant.

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Hurricane warming indicates that a hurricane could hit your region.

Although hurricanes are not very harmful, we must be attentive and prepared with specific tools and equipment to deal with them.

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A circuit for an electronic device is made up of separate electronic parts like diodes, resistors, transistors, capacitors, inductors, and transistors that are connected by conductive wires or traces that allow current to flow.

What mass of copper would be in a 1-mm length of such an interconnect, assuming a square cross section?

Given that wire has a square cross section, its height and breadth are equal in length.

The logic circuitry that reacts to and processes the fundamental commands that power a computer is known as a processor (CPU). Given that it interprets the majority of computer commands, the CPU is regarded as the primary and most important integrated circuits (IC) chip in a computer.

Copper interconnects are interconnects used in semiconductor technology. They serve to cut down on power usage and propagation delays in silicon integrated circuits (ICs).

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The IUPAC name of the compound is 1- ethyl-3-methyl-cyclohexane.

An alkane is a compound that is composed of only carbon and hydrogen. The alkane could be an acyclic compound or a cyclic compound. A cyclic compound is one that has the carbon atoms arranged to form a given shape.

The compound now has the carbon atoms at the vertices of the shape. There could also be substituents that are attached to the cyclic compound. If we look at the image as shown, we can see that position 1 has the ethyl substituent and position 3 has the methyl substituent.

With this in mind, we could now properly name the compound as; 1- ethyl-3-methyl-cyclohexane.

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The masses and volume of the required reagent are as follows:

The mass in grams of KCIO₃ needed to produce 2.56 grams of O₂ is determined from the mole ratio of the reaction as given in the equation of reaction below:

2 KCIO₃ (s) → 2 KCl (s) + 3 O₂ (s)

From the equation of reaction, 2 mole of KCIO₃ produces 3 moles of O₂.

Moles of O₂ in 2.56 grams = 2.56/32

Moles of O₂ in 2.56 grams = 0.08 moles

Moles of KCIO₃ required = 0.08 * 2/3

Moles of KCIO₃ required = 0.0533 moles

molar mass of KCIO₃ = 122.5 g/mol

Mass of KCIO₃ required = 0.0533 * 122.5

Mass of KCIO₃ required = 6.53 g

Mass of precipitate formed when 25.00 mL of 0.200M BaCl₂ and 35.00 ml. of 0.125 M Na₂SO₄ are mixed is determined as follows:

BaCl₂ (aq) + Na₂SO₄ → BaSO₄ (s) + 2 NaCl (aq)

Moles of BaCl₂ reacting = 25.00 mL * 1 L/1000 mL * 0.200M

Moles of BaCl₂ reacting = 0.005 moles

Moles of Na₂SO₄ reacting = 35.00 mL * 1 L/1000 mL * 0.125 M

Moles of Na₂SO₄ reacting = 0.4375 moles

Na₂SO₄ is the limiting reactant and moles of BaSO₄ precipitate formed = 0.4375 moles

molar mass of BaSO₄ = 233 g/mol

mass of BaSO₄ precipitate formed = 0.4375 moles * 233 g/mol

mass of BaSO₄ precipitate formed = 1.02 g

Volume of 0.250 M KCl (aq) that will completely react with 50.0 ml.

of 0.115M Pb(NO₃)₂ (aq) is determined as follows:

Pb²⁺ (aq) + 2Cl⁻ (aq) → PbCl (s)

Moles of Pb(NO₃)₂ = 50 ml * 1 L/1000 mL * 0.115 M

Moles of Pb(NO₃)₂  = 0.00575 moles

Moles of KCl required = 2 *  0.00575 moles

Moles of KCl required = 0.0115 moles

Volume of KCl required = 0.0115/0.250

Volume of KCl required = 0.046 L

Volume of KCl required = 46.0 mL

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Repeated observations have consistently shown that oppositely charged objects attract each other and can be considered Law.

The proper sequence of steps inside the medical technique is to look at a phenomenon, develop speculation, design and carry out a Law experiment to check the speculation, examine and interpret statistics, and finally proportion the effects with different scientists. Experiments are hardly ever accurate, so it's important to hold testing a hypothesis. Scientists can learn experimental strategies via repeated checking out of a hypothesis.

Repeated observations help determine whether or not the speculation is constantly genuine in different instances. a systematic idea is a properly substantiated explanation of some factor of the herbal world, primarily based on a body of statistics that have been repeatedly confirmed via statements and experiments. Such reality-supported theories are not guesses but reliable money owed by the real international. scientific theories may be changed or changed while new data disproving the modern principle turns into be had.

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The name of the compound is 1 chloro-3- cyclohexane and it is most stable in the equatorial conformation.

A model is a representation of a compound. The model shows us the way that the atoms in the compound are arranged. Thee bonds could be shown by the use of the following kinds of model in science;

1) The ball and stick model

2) The space filling model

Now we know that the model could both serve as a tool for representation as well as a tool of explanation. We could use the model of the molecule to understand the chemical interactions that could be possible for the molecule that is under study.

What we have here is a ball and stick model of the compound 1 chloro-3- cyclohexane

The conformation of the molecule is an indicator of how stable the compound would be. In this case, the more stable conformation of the compound would be the equatorial conformation.

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Answer:

the answers b

Explanation:

Answer:

D)The liquid in test tube #2 was Catalase.

Explanation:

Answer:

Methane

Their atmospheres both contain Methane, which makes them appear blue in color. Neptune is believed to have an active and changing atmosphere. Uranus and Neptune have rings and many moons and are part of a group called the Outer planets.

Explanation:

Answer:Uranus and Neptune have similar masses and internal compositions. Their outer atmospheres are composed of hydrogen, helium and methane, while their mantles are a combination of water, ammonia and methane ices, and their cores are a mix of rock and ice.

Structure. Uranus is one of two ice giants in the outer solar system (the other is Neptune). Most (80% or more) of the planet's mass is made up of a hot dense fluid of "icy" materials – water, methane, and ammonia – above a small rocky core.

Explanation:

The amount of Amoxicillin dose given to the 85.4 lb child daily is determined as 1,743.3 mg.

The amount of  Amoxicillin  dose given to the child is calculated as follows;

amount of Amoxicillin dose = weight of the child x dosage prescribed

The weight of the child in pounds (lb) is calculated as follows;

1 lb = 0.453592 kg

85.4 lb = ?

= 85.4 x 0.453592 kg

= 38.74 kg

amount of Amoxicillin dose = 38.74 kg x 45 mg/kg

amount of Amoxicillin dose = 1,743.3 mg

Thus, the amount of Amoxicillin dose given to the 85.4 lb child daily is determined as 1,743.3 mg.

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The complete question is below:

A 85.4 lb child has a Streptococcus infection. Amoxicillin is prescribed at a dosage of 45 mg per kg of body weight per day given b.i.d. Calculate the daily dose of the child.

Geese flying south for the winter is migration kind of adaptation the annual, large-scale movement of birds between their breeding (summer) homes and their nonbreeding (winter) grounds.

Adaptation results from evolution. Evolution causes a species to change over a long period of time. Usually, mutations or unintentional gene alterations result in adaptations. Depending on the mutation, a plant or animal may be able to live longer than other members of its species.

Adaptations might be behavioural or physical. Any structural change made to a body part qualifies as a physical adaptation. An animal will often make a response in response to some sort of external stimulation.

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Answer:

False

Explanation:

They need a large amount of energy because they're constantly working