What is the name of this lab equipment

66.3% is the percent yield for the reaction PCl3(g) + Cl2(g) -> PCl5(g).

The correct option is E.

The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield multiplied by 100% divided by the experimental yield. The percent yield is 100% if the theoretical and actual yields are equal.

A greater yield percentage may be an indication that your product is tainted with water, too much reactant, or other impurities. A lower yield percentage could mean that you miscalculated a reactant or spilled some of your product.

Divide the theoretical yield by the experimental yield. Calculate the percent yield by multiplying this figure by 100.

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The complete question is-

What is the percent yield for the reaction PCl3(g) + Cl2(g) -> PCl5(g). if 119.3 g of PCl5 (M = 208.2 g/mol) are formed when 61.3 g of Cl2 (M = 70.91 g/mol) react with excess PCl3?

a-57.3%

b-48.6%

c-51.3%

d-94.6%

e-66.3%

B. The landform shared by both coastlines is dunes.

Sand dune is the process through which sand grains gather into a mound or ridge by the action breeze caused by gravity.

A sand dune is a landform made from wind or water as deposition agent. This sand dune usually take the shape of a ridge or hill.

Sand dunes are formed when rock break into particles that are easily carried by the wind to form this upward shape.

Once that first upward shape forms, sand gather up on a particular side until it takes the shape of dune

Thus, the landform shared by both coastlines is dunes.

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Answer:

The correct answer is 0.021

Explanation:

It is asked that the student rounds to the thousandths, but he/she rounded to the hundredths. To fix his/her answer, they must go three places to the right of the decimal to the thousandths place and round the 0 up to 1 because the next place value is greater than or equal to 5. The correct answer is 0.021.

Reaction will not occur in first case and will occur in second case.

A. When Copper is mixed with HCl

When Copper and hydrochloric acid are mixed no reaction takes place because Cu is present below hydrogen. Diluted acids do not react with metals below hydrogen because they cannot replace hydrogen in diluted acid and are less reactive than hydrogen.

B. Sodium trioxocarbonate (IV) and trioxocarbonate acid (IV)-

When sodium trioxocarbonate (IV) and trioxocarbonate acid (IV) are mixed Sodium bicarbonate is formed.

A salt called sodium bicarbonate also called as baking soda  decomposes in water to produce sodium and bicarbonate. A solution becomes alkaline as a result, making it capable of neutralizing acid.

The balanced chemical equation is-

Na₂CO₃ + H₂CO₃ → 2NaHCO₃

Hence in A reaction does not occur while in B reaction occurs and Sodium bicarbonate is formed.

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Answer:

Lithium

Explanation:

Lithium is in group 1 and group 1 elements have only 1 valence electron on their outer shell.

Beryllium is in group 2 so it has 2 valence electrons.

Boron is in group 3 so it has 3 valence electrons.

Carbon is in group 4 so it has 4 valence electrons.

Answer:

8 km

Explanation:

1 km=1000 m

8 km=

8 km * 1000m/1 km=8000m

8000m>80m

8km>80m

Answer:

e

The positive potassium (K+) ions of KCl are pulled into solution by the slightly negative Oxygen atom on the water molecule.

Explanation:

Thank you !

Explanation:

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Chemical reactions involving the carboxyl, amino, and R groups of amino acids are many. Particularly significant are two reactions: cysteine oxidation and peptide bonding.

Amino acids perform a variety of bodily processes, including muscular growth, triggering bodily chemical processes, delivering nutrition, fending off disease, and more. Low levels of amino acids can affect many different aspects of health, including immunity, digestion, depression, fertility, mental alertness, and infant growth.

Proteins and amino acids are the components of life. Amino acids are the byproducts of the digestion or breakdown of proteins. Amino acids are used by the human body to create proteins that aid in: Dissect food.

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Step-1. Resonance structures are a set of two or море Lewis structures that collectively describe the electronic. bonding a single Polyatomic. Species include functional bonds and functional Charges.

Step-2. All the resonance structures. must follow the rule writing Lewis Structures. The Hybridisation of Structure must stay the same. The skeleton. of the structure cannot be charged the Same Resonance Structure must have the number of lone pairs.

Whenever Structure for you can draw two or more Lewis molecules. different only the location of the electron, the actual structure. is none of the structure but the resonance hybrid of them all.

Step-3 Given in the picture:

Step-4 The acetate anion (CH₂ coo) has two resonance Structures of the same energy.

These overlap to With half - bonds give the resonance. hybrid is poss the c-o intermolecular distance.

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Answer:

climate

Explanation:

they show climate and they are updated every 3 years so we can see how hot the planet is becoming

Answer:

3 moles CH4, and each mole contains 6.02x10^23 molecules and each molecule contains 5 atoms, so there are 5 atoms/molecule x 6.02x10^23 molecules/mole x 3 moles = 9x10^24 atoms

Explanation:

When boiling, the total mass of liquid and vaporized water stays the same.

The law of conservation of mass states that the mass can neither be created nor destroyed but is transformed from one form to another.

The law helps us to understand the conversion of energy from one form to another.

For example in a torch, the chemical energy of the batteries is converted into electrical energy, which is converted into light and heat energy.

Based on the law of conservation of mass, the total mass of of liquid and vaporized water during boiling will be constant.

Thus, when boiling, the total mass of liquid and vaporized water stays the same.

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Answer: stays the same

Explanation:

Answer:

An ion

Explanation:

An ion consists of 26 protons, 28 neutrons, and 23 electrons.

The measures of angles P and S

A quadrilateral with two sets of parallel sides is referred to as a parallelogram. In a parallelogram, the opposing sides are of equal length, and the opposing angles are of equal size. Additionally, the interior angles that are additional to the transversal on the same side. A parallelogram is PQRS. Parallelograms come in 4 different varieties, including 3 unique varieties. The four varieties are rhombuses, parallelograms, squares, and rectangles.

P and S are adjacent angles in the parallelogram PQRS, and the total of all adjacent angles in a parallelogram is 180 degrees.

Angle P + Angle S equals 180 degrees.

More information is needed, though, to calculate certain angles.

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Answer:

This is element 8 which is Oxygen.

Oxygen has two shell

Where L = 2

M = 8

I. E. 8 - 2 =>6

.: it has 6 valence electrons with 0 unpaired electrons.

Answer:

industrial lab safety, therefore, is critical to safeguard the health and well-being of these technicians, as is the protection of equipment, products, samples, supplies and the facility itself. The importance of testing lab safety cannot be overstated; it helps keep all of these components — most notably, workers — out of danger.

Safety is important in middle-school and high-school science labs to ensure students and teachers stay out of harm's way. Science classrooms often have equipment -- such as Bunsen burners, chemicals and sharp tools -- that pose potential hazards if used improperly. Teachers and school administrators don't have the time or the budget to deal with liability lawsuits, and dangerous incidents could damage the school's and the teacher's reputation.

Explanation:

this should answer all 4

The new rate constant is 1.5 * 10^6  M-1s-1 .

In this case we know that we have to use the Arrhenius equation to find the rate constant at two different temperatures by the use of the formula;

ln(k2/k1) = -Ea/R(1/T2 - 1/T1)

k2 = Rate constant at  436 K

k1 = Rate constant at 249 K

T1 = initial temperature

T2  = final temperature

R = Gas constant

Ea = activation energy

Hence;

ln(k2/1.60 × 10^2) = -38 * 10^3/8.314(1/436 - 1/249)

ln(k2/1.60 × 10^2) =  -38 * 10^3/8.314(0.002 - 0.004)

ln(k2/1.60 × 10^2) =  9.14

k2/1.60 × 10^2 = e^ 9.14

k2 = e^ 9.14 * 1.60 × 10^2

k2 = 1.5 * 10^6  M-1s-1

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1. The cation in Co(NO₃)₂ is Co²⁺

2. The anion in Co(NO₃)₂ is NO₃⁻

We'll begin by defining cation and anion. This is given below:

A cation is an atom which possesses a positive charge.

An anion is an atom or group of atoms which possesses a negative charge

To obtain the cation and the anion in Co(NO₃)₂, we shall write the dissociation equation. This is illustrated below:

Co(NO₃)₂(aq) --> Co²⁺(aq) + 2NO₃⁻(aq)

From the above equation, we can conclude that the cation and the anion in Co(NO₃)₂ is:

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In evolution, isolation means one group is separated and isolated from a population to study the adaption of evolutionary changes over a period of time.

A natural phenomenon called evolution describes how inheritable traits of a species alter through time.

Natural selection, mutation, genetic drift, and migration are the key drivers. Geographical or reproductive isolation stop the exchange of genetic material across populations. As a consequence of adaptation to a particular environment or niche throughout time, populations of many species changed (natural selection).

When there is a barrier that the creatures can't overcome, they become isolated, which implies they are separated from other members of their species. The isolation of organisms is a consequence of environmental change. When mountain ranges or deserts emerge or when continents separate, isolation may develop gradually.

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Answer:

lake

Explanation:

because its the only thing possible there to be man/human-made

The mass of the solid is calculated to be 118.28g.

The mass of a substance can be calculated using the following formula:

Density = mass ÷ volume

According to this question, a liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 77.0 mL. The liquid solvent has a mass of 29.4 g and a density of 0.865 g/mL.

First, we calculate the volume of the liquid as follows:

0.865 = 29.4/volume

volume = 29.4/0.865

volume of the liquid solvent = 33.99mL

Volume of the solid = 77.0mL - 33.99mL = 43.01mL

Mass of the solid = 43.01mL × 2.75 g/mL

Mass of the solid = 118.28g

Therefore, the mass of the solid is 118.28g

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Height of a mountain is 5348.9 meter.

1 kilometer is equal to 1000 meter.

The meter, symbol m, is the primary unit of period in the international system of gadgets, although its prefixed paperwork also are used relatively regularly.

A meter is a general metric unit identical to about three feet 3 inches. This means that a meter is part of the metric gadget of dimension. Guitars, baseball bats, and backyard sticks are examples of items which might be approximately one meter lengthy. Meters also are used to measure distances in races, inclusive of strolling and swimming.

Meter readings tell power suppliers how a lot gasoline and energy you are the use of. In case you do not give your provider meter readings they may have to guess your usage. You typically turn out to be paying too much or too little while this occurs.

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A new moon appears once every lunar year and a lunar year is roughly 29.5 earth days. So the next moon would appear about 29 or 30 days after October 1st. This would be around either October 30th or 31st as 0.5 days doesn't exist.

The energy of the photons are;

infrared radiation - 8.3* 10^4 J  

visible light - 2.52 * 10^5 J

ultraviolet radiation - 7.72 * 10^5 J

The energy of photon could be found by the use of the of the equation;

E = hc/λ * 6.023 * 10^23/1 mole

E = energy of the photon

c = speed of light

λ = wavelength of the photon

Now;

For infrared radiation;

E = 6.6 * 10^-34 * 3 * 10^8/1580 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol

E = 8.3* 10^4 J  

For visible light;

E = 6.6 * 10^-34 * 3 * 10^8/520 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol

E = 2.52 * 10^5 J

For ultraviolet radiation;

E = 6.6 * 10^-34 * 3 * 10^8/170 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol

E= 7.72 * 10^5 J

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Peter Goemans  is the founder of Blue Bell .

Blue Bell was established in 1907 as a means of utilising extra cream from nearby dairy producers. Brenham Creamery Company, the predecessor to the business that is today known as Blue Bell, was founded in 1907. The men who founded it thought the name made sense because it was in the sleepy Texas town of Brenham.

Blue Bell may soon resume selling ice cream after a widespread recall forced the company to lay off 1,500 workers in May. Following a widespread product recall this past spring, Sid Bass, a Fort Worth oil millionaire, has now accepted a "substantial investment" from the Brenham, Texas-based ice cream firm Blue Bell.

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