PLS HELP ASAPPP !!! WILL GIVE BRAINLIEST

The purpose of this lab was to explore the concept of percent yield and to determine how it can be affected during experimentation. We learned that percent yield is the ratio of the actual yield of a product.

Ratio is a mathematical comparison of two related values or quantities. It is expressed as a fractional relationship, such as "2 to 4," "1:4," or "2/4." In mathematics, ratios are used to make comparisons between two or more quantities. Ratios can be used to measure how one quantity is related to another, or to compare two or more items. For example, if a person weighs 120 pounds and their height is 5 feet, the ratio of their weight to their height is 120:5 or 24:1. Ratios can also be used to compare items in different categories, such as the number of people in a group to the number of cars they own, or the number of apples to oranges in a basket.

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The mass of water reacted is 17.67g.

STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.

According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -

It is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.

One mole of a gas under STP conditions occupies a volume of 22.4L.

Given,

Volume of oxygen = 11L

Since 1 mole of a gas occupies 22.4 L of volume at STP.

Moles of oxygen produced = 11 ÷ 22.4

                                              = 0.49 moles

From the reaction,

1 mole of oxygen is produced by 2 moles of water.

Thus, 0.49 moles of oxygen is produced by 0.49 × 2 moles of water

So, moles of water = 0.98 moles

mass = moles × molar mass

          = 0.98 × 18

            = 17.67g

Therefore, mass of water reacted is 17.67g.

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At chemical equilibrium, the partial pressure of the three gases is 0.265 atmospheres.

Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.

At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.

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Aluminum sulfate is very non-toxic, having acute and chronic oral LD50 values above 5,000mg/kg (5). Alum, on the other hand, can cause irritation, burns, and breathing problems.

What is Aluminium sulfate used for?

Aluminum sulfate is a crystalline (sand-like) solid that is odorless, white or colorless. It is utilized in sewage treatment, water purification, paper production, and leather tanning. Aluminum sulfate is also known as alum or papermaker's alum; however, the term "alum" refers to any double sulfate salt having the general formula XAl(SO4)212H2O, where X is a monovalent cation such as potassium or ammonium (5).

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Answer:

Atoms of the same element can have different numbers of neutrons.

Explanation:

This statement is true because atoms of the same element have the same number of protons, which determines the element's atomic number. However, they can have different numbers of neutrons, which gives rise to different isotopes of that element. These isotopes have the same number of protons, but different numbers of neutrons, leading to different atomic weights. So, while the number of protons is fixed for a particular element, the number of neutrons can vary.

Answer:

To solve this problem, we can use the equation for the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we need to find the total number of moles of gas in the bottle. We know that the bottle contains 0.270 mol of N2, and we can find the number of moles of CO2 by using the partial pressure and the total pressure:

P(CO2) / P(total) = n(CO2) / n(total)

0.250 atm / 4.90 atm = n(CO2) / n(total)

n(CO2) = 0.0128 mol

The total number of moles is then:

n(total) = n(O2) + n(N2) + n(CO2) = n(N2) + n(CO2) + n(O2) = 0.270 mol + 0.0128 mol + n(O2)

n(total) = 0.2828 mol + n(O2)

Next, we can use the ideal gas law to find the number of moles of O2:

PV = nRT

n(O2) = PV / RT

We can rearrange this equation to solve for P(O2):

P(O2) = n(O2)RT / V

We know that R = 0.08206 L·atm/mol·K and T = 273 K. We also know that P(total) = 4.90 atm, and we can find the volume of the bottle by using the given information that it contains 3.00 L:

n(O2) = P(O2) V / RT

0.2828 mol + n(O2) = P(O2) (3.00 L) / (0.08206 L·atm/mol·K) (273 K)

0.2828 mol + n(O2) = 35.75 P(O2)

We can use the information that the partial pressure of CO2 is 0.250 atm to find the partial pressure of N2:

P(N2) = P(total) - P(O2) - P(CO2) = 4.90 atm - P(O2) - 0.250 atm

P(N2) = 4.65 atm - P(O2)

Finally, we can use the fact that the total pressure is the sum of the partial pressures to find P(O2):

P(total) = P(O2) + P(N2) + P(CO2)

4.90 atm = P(O2) + (4.65 atm - P(O2)) + 0.250 atm

4.90 atm = 4.90 atm

Solving for P(O2), we get:

P(O2) = 0.990 atm

Therefore, the partial pressure of O2 is 0.990 atm.

Answer:

The molecular formula is Sn3(PO4)4.

Explanation:

The molecular formulas are:

Na2SO4: Sodium sulfate

C6H5Cl: Chlorobenzene

N2O4: Dinitrogen tetroxide

Sn3(PO4)4: Tin(IV) phosphate

These are all chemical compounds represented by their molecular formulas.

IV. a. C₂H₂

b. C₂H₄

V. a. C₅H₄

b. C₆H₆

VI.

a. Reactants: Na₂SO₄(aq) + Ca(NO₃)₂(aq) Products: CaSO₄(s) + 2NaNO₃(aq). Type of reaction: Double displacement or precipitation reaction.

b. Reactants: Mg(s) + N₂(g) Products: Mg₃N₂(s). Type of reaction: Synthesis reaction.

VII.

a. 2Hg(NO₃)₂(s) → 2Hg(l) + 2NO₂(g) + O₂(g)

b. Ca₃(PO₄)2(aq) + 6H₃PO₄(aq) → 3Ca(H₃PO₄)₂(aq)

c. 3NaOH(aq) + FeCl₃(aq) → Fe(OH)₃(s) + 3NaCl(aq)

In part IV, we were asked to write the molecular formula of given compounds based on the given elemental components. For example, acetylene is composed of 2 carbon atoms and 2 hydrogen atoms, so its molecular formula is C₂H₂. Similarly, ethylene has 2 carbon atoms and 4 hydrogen atoms, so its molecular formula is C₂H₄.

Lastly, In part VII, we were asked to balance given chemical reactions. Balancing a chemical equation involves adjusting the coefficients in front of the reactants and products to ensure that the number of atoms of each element is equal on both sides of the equation. For example, in the reaction where solid mercury (II) nitrate is heated to produce liquid mercury, nitrogen gas, and oxygen gas, the balanced equation is 2Hg(NO₃)₂(s) → 2Hg(l) + 2NO₂(g) + O₂(g). Also, we can balance the other two equations given in part VII by adjusting the coefficients.

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The overall energy change for the combustion of one mole of methane according to given chemical equation is 2648 kJ/mole.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The combustion involves reactants that is 413×4 +498×2=2648 kJ.

Thus, overall energy change for the combustion of one mole of methane according to given chemical equation is 2648 kJ/mole.

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The doctor would then be aware of Greg's weight of 108.6 kg.

Typically, you won't be allowed to eat or drink for six hours prior to the procedure, although you can drink water. Moreover, you should refrain from intense activity for 24 hours before to your consultation. It's wise to dress comfortably and loosely.

The internal organs and tissues of your body are depicted in great detail by a CT scan. A PET scan can be more sensitive than other imaging procedures and can detect aberrant activity. Also, it can cause your body to alter sooner. PET-CT scans are used by doctors to reveal more details about the cancer.

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To get a positive specific heat capacity, we would need to reverse the sign of ΔT1. However, the magnitude of c would still be the same. Therefore, the specific heat capacity of the metal is 0.137 J/(g·◦C).

Specific heat capacity is the amount of heat energy required to raise the temperature of one unit of mass of a substance by one degree Celsius (or one Kelvin). It is a property that describes how much heat energy a material can absorb or release when its temperature changes.

The specific heat capacity of a substance depends on its chemical composition and physical state.

Assuming that no heat is lost to the surroundings, we can write:

heat gained by metal = heat lost by water

The heat gained by the metal can be calculated as:

q1 = mcΔT1

where m is the mass of the metal, c is its specific heat capacity (which we need to find), and ΔT1 is the change in temperature of the metal.

The heat lost by the water can be calculated as:

q2 = mcΔT2

where m is the mass of the water, c is the specific heat capacity of water (which is 4.184 J/(g·◦C)), and ΔT2 is the change in temperature of the water.

We know the initial and final temperatures of the metal and water, so we can calculate the changes in temperature:

ΔT1 = (30 ◦C) - (89 ◦C) = -59 ◦C

ΔT2 = (30 ◦C) - (21 ◦C) = 9 ◦C

We also know the masses of the metal and water:

m1 = 33 g

m2 = 43 g

Using the law of conservation of energy, we can set q1 equal to q2 and solve for c:

mcΔT1 = mcΔT2

c = (m2/m1) * (ΔT2/ΔT1) * 4.184 J/(g·◦C)

Plugging in the given values, we get:

c = (43 g / 33 g) * (9 ◦C / -59 ◦C) * 4.184 J/(g·◦C)

c = -0.137 J/(g·◦C)

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Hello there! Here are the answers you're looking for!

1: displacement reaction

2: (I can't really answer this one for you because i don't know what the items you used in your lab were, But ill just say Highly Toxic Chemicals)

3: a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

4: (same thing here, i don't know what your lab was about! So i cant answer how it was used here.)

Sorry, i could not answer 2 of them, But hopefully, you get a good grade! Hope this helps!!

Answer:

Among the options you provided, the correct answer would be Double chemo-therapy gloves and Protective gown, as administering oral liquid to a patient carries a risk of splashing or splattering, and healthcare workers may want to avoid any contact with the patient's body fluids or the medication. However, it is important to note that this may depend on the specific policies and regulations in the healthcare setting, and healthcare workers should always follow the appropriate protocols and guidelines. Respiratory protection is not typically necessary for administering oral liquid. Single chemo-therapy gloves may be used for standard precautions, but the use of double gloves may provide additional protection.

Explanation:

Answer:

23Na

Explanation:

23Na+ has 11 protons since the atomic number of sodium (Na) is 11.

Therefore, the isotope that contains the same number of protons as 23Na+ is 23Na itself.

22Na has 10 protons, 24Mg has 12 protons, and 24Al- has 13 protons. Therefore, they dont contain the same number of protons as 23Na+.

The pressure of NO2 after equilibrium is re-established is 1.432 atm and that of N2O4 is 0.1026 atm.

Writing the equilibrium expression for the specified reaction is the first step.

Kp is equal to (P(N2O4))²/(P(NO2))²

Next, using the partial pressures of NO2 and N2O4 at equilibrium provided, we must determine the value of the equilibrium constant Kp.

Kp = (0.0513)2 / (0.716)2 = 0.00201

The new equilibrium partial pressures of NO2 and N2O4 are P'(NO2) and P'(N2O4), respectively. Then:

P'(NO2)=2 x 0.716 = 1.432 atm

P'(N2O4) is equal to two times 0.0513 atm.

Last but not least, we may determine whether the new equilibrium partial pressures satisfy the expression for the equilibrium constant:

Kp = (P'(N2O4))²/ (P'(NO2)² = (0.1026) (0.1026)² / (1.432) (1.432)² = 0.00201

As a result, when equilibrium is restored, the pressures of NO2 and N2O4 are both 1.432 atm for NO2 and 0.1026 atm for N2O4, respectively.

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Answer:

35.4g

Explanation:

Na = 23 g/mol

NaN3 = 23 + 3(14) = 65 g/mol

2NaN3 -> 3N2 + 2Na

=> 2 moles of NaN3 will produce 2 moles of Na

or 1 mole of NaN3 will produce 1 mole of Na

the moles of NaN3 with mass of 100.0 g is 100/65 moles

so mass of Na is: (100/65) x 23 = 35.38 or 35.4g

The solar energy is a massive source of energy which can generate electricity and reduce the global warming emissions. But the set up of solar panels have both positives and negatives.

The manufacturing process of solar panels requires hazardous chemicals and materials for cleaning the semiconductors. The chemicals include hydrofluoric acid, sulfuric acid, etc.

In addition to the release of these chemicals, the solar panel manufactures inhale silicon dust which threatens the public health. The solar energy systems require a large area of land which can lead to the loss of wildlife habitats.

The construction of solar panels also affect soil compaction and erosion.

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Explanation:

Sedimentation and decantation are separation techniques that rely on the differences in densities of the solid and liquid components. In the case of a solid dissolving in a liquid, the solid particles become uniformly dispersed throughout the liquid, forming a homogeneous mixture.

Since the solid particles are not settling down due to gravity and instead are evenly distributed throughout the liquid, sedimentation cannot be used to separate the solid from the liquid. Similarly, decantation, which involves pouring off the liquid while leaving the settled solid behind, is not applicable because there is no settled solid.

To separate a dissolved solid from a liquid, other separation techniques such as filtration or evaporation may be used. Filtration involves passing the mixture through a filter medium that retains the solid particles while allowing the liquid to pass through. Evaporation involves heating the mixture to vaporize the liquid component, leaving the solid behind.

Answer:

Oxygen 17 isotope with neutral charge

Explanation:

The atom has 8 red protons and 8 black electrons so it is neutral. Since it has 8 protons, it has atomic number of 8, which is oxygen (O).

There are 9 blue neutrons. The mass number = #protons + #neutron = 8 + 9 = 17. Therefore it is the oxygen 17 isotope.

The mass of mercury produced when 1.25g of mercury(II) oxide (HgO) is decomposed will be 1.247 g.

Decomposition means to break up into component parts by chemical activity. Chemical decomposition, also known as chemical breakdown, is the activity of breaking down a single chemical entity (such as a regular molecule, reaction intermediate, etc.) into two or more pieces.

The precise opposite of chemical synthesis is often understood and characterized as chemical breakdown.

The reaction for the given question is:

2 HgO(s) → 2 Hg(l) + O₂(g)

Molar mass of Hg = 200.59 g/mol

Given, mass of HgO = 1.25g

Thus, moles of Hg = 1.25 g / 200.59 g/mol = 0.006225 mol

Therefore, mass of mercury produced from HgO by decomposition = 0.006225 mol × 200.59 g/mol = 1.247 g.

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The formula for ammonium dichromate is (NH4)2Cr2O7. The number of atoms in this compound is 36 .

What is atom?

An atom is the basic unit of matter. It is the smallest particle of an element that retains the chemical properties of that element. Atoms are made up of three types of particles: protons, neutrons, and electrons. Protons and neutrons are located in the nucleus of the atom, while electrons orbit around the nucleus in shells or energy levels. The number of protons in an atom's nucleus determines the element it represents. Atoms can combine with other atoms to form molecules, which make up all the matter in the universe. The study of atoms and their behavior is known as atomic physics or atomic chemistry.

The formula for ammonium dichromate is (NH4)2Cr2O7. To count the number of atoms in this compound, we need to first determine the number of atoms for each element present in the compound and then multiply those values by their respective coefficients:

There are 2 nitrogen atoms (N) for each ammonium ion, so there are a total of 2 x 2 = 4 nitrogen atoms.

There are 8 hydrogen atoms (H) for each ammonium ion, so there are a total of 8 x 2 = 16 hydrogen atoms.

There are 2 chromium atoms (Cr) in the compound.

There are 7 oxygen atoms (O) for each dichromate ion, so there are a total of 7 x 2 = 14 oxygen atoms.

Therefore, the total number of atoms in (NH4)2Cr2O7 is:

4 nitrogen atoms + 16 hydrogen atoms + 2 chromium atoms + 14 oxygen atoms = 36 atoms

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Answer: sediments

Explanation: Weathering of volcanic ash and pumice is unique regarding minerals formed and mineral formation. These minerals include allophane, imogolite, opaline silica, and some halloysites, and have distinctive structures and properties. Mar 10, 1987

Erosion and weathering transform boulders and even mountains into sediments, such as sand or mud. A dissolution is a form of weathering—chemical weathering. With this process, water that is slightly acidic slowly wears away the stone. These three processes create the raw materials for new, sedimentary rocks.

1) It would be a supercritical fluid

2) The approximate rate constant is 0.5 Ms-1

3) Can not be deduced from the graph alone

4) The threshold energy is A

5) rate = k[A]^2 [B]^2

A supercritical fluid is a substance that is heated and pressurized to a point where it exists in a state that is intermediate between a gas and a liquid. This state is known as the supercritical state.

Supercritical fluids have properties of both gases and liquids. Like gases, they can expand to fill their containers, but like liquids, they have a high density and can dissolve other substances. In the supercritical state, the fluid has a higher density and viscosity than a gas, but a lower density and viscosity than a liquid.

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13.8 g of magnesium chloride is equal to 8.73 x 10 22 formula units ( MgCl2 ). chlorhydrate of magnesium. a two-chloride ion and one magnesium-based inorganic molecule.

This drug is a mineral supplement used to prevent and cure low levels of magnesium in the blood. Certain brands are also used to treat symptoms of too much stomach acid, including indigestion, heartburn, and stomach discomfort.

Chloride of magnesium

It serves as a crucial coagulant in the production of tofu, soy, drinks, and infant formula milk. Magnesium chloride is also employed in the brewing of beer as a taste ingredient and in food coloring.

MgCl2 mass = 13.8 g

Molar mass of MgCl2 = 95.2 g/mol

Number of moles of MgCl2 = ( mass of MgCl2 / Molar mass of MgCl2)

           = ( 13.8g ) / ( 95.2g/mol) = 0.14496 mol

Number of MgCl2 moleucles ( or number of formula units) = Moles of MgCl2 x avagadro number

                       = 0.14496 mol x 6.022 x 10^ 23

                   = 8.73 x 10^ 22

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Answer:

The equation gives the de Broglie wavelength of an object:

λ = h / p

Where λ is the de Broglie wavelength, h is Planck's constant (6.626 x 10^-34 J s), and p is the object's momentum.

The momentum of an object can be calculated using the equation:

p = m * v

Where m is the mass of the object and v is its velocity.

In this case, the mass of the object is 0.053 g, which is equivalent to 0.053 x 10^-3 kg. The velocity of the object is 0.16 m/s. So, the momentum of the object is:

p = (0.053 x 10^-3 kg) * (0.16 m/s) = 8.48 x 10^-6 kg m/s

Substituting this value of momentum and Planck's constant into the de Broglie wavelength equation, we get:

λ = (6.626 x 10^-34 J s) / (8.48 x 10^-6 kg m/s)

Simplifying, we get:

λ = 7.82 x 10^-28 m

Therefore, the de Broglie wavelength of a 0.053 g object moving at a speed of 0.16 m/s is 7.82 x 10^-28 m.

Explanation:

When a tiger with a mass of 31kg is running to the east with a velocity of 15m/s, the momentum of the tiger is 465kg-m/s.

What is momentum?

3 words that are used to define momentum is "Mass in motion". If an object is moving, then it has momentum because all the objects have particular masses, those will be then called as masses in motion. Linear momentum is denoted by P. Mathematically, it is represented as-

P = m × v

where m = mass of the object

v = velocity of the object in a particular direction

Momentum that is involved with circular motion is called as Angular momentum.

Given,

mass of a tiger = 31kg

velocity of  tiger = 15m/s

Momentum = p = 31 × 15 = 465kg-m/s

Therefore, when a tiger with a mass of 31kg is running to the east with a velocity of 15m/s, the momentum of the tiger is 465kg-m/s.

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The 25 is the new volume of this gas at 5 degrees Celcius and 2 atm.

What is temperature ?

Temperature is a unit used to represent how hot or cold something is. It can be stated using the Celsius or Fahrenheit scales, among others. Temperature shows which way heat energy will naturally flow, i.e., from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature).

What is volume ?

Space is occupied by every three-dimensional object. Its volume serves as a gauge for this area. The area contained by an object's limits in three-dimensional space is referred to as its volume. Another name for it is an object's capacity.

Therefore, 25 is the new volume of this gas at 5 degrees Celcius and 2 atm.

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White-tailed deer have eyes on the sides of their heads. This provides them with a broad range of view for identifying predators.

Adaptation has three meanings in biology. For starters, natural selection is a dynamic evolutionary process that adapts organisms towards their environment, increasing their evolutionary fitness.

Second, it is a condition attained by the population as a result of that process. The fawns depend on their behavioral and physical adaptations to survive their first few weeks. White-tailed deer are quick and nimble. White-tailed deer have eyes on the sides of their heads. This provides them with a broad range of view for identifying predators.

Therefore, white-tailed deer have eyes on the sides of their heads. This provides them with a broad range of view for identifying predators.

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6 mol of KClO3 will produce 288 grams of O2, when 6 mol of KClO3 decomposes.

How to calculate mass of O2 for this problem?

The balanced chemical equation for KClO3 decomposition is:

2 KClO3 →

2 KCl + 3 O2

According to the equation, 2 moles of KClO3 produce 3 moles of O2.

Therefore, 6 moles of KClO3 will produce (6/2) x 3 = 9 moles of O2.

To calculate the mass of O2 produced, we need to use the molar mass of O2, which is approximately 32 g/mol.

So, the mass of O2 produced will be:

mass = number of moles x (molar mass)

mass = 9 mol x 32 g/mol

mass = 288 g

Therefore, 6 mol of KClO3 will produce 288 grams of O2.

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