Gravimetric Analysis
1. 8.5g of a metal halide salt was dissolved in water and reacted with excess silver nitrate solution.
13.34g of a cream precipitate was produced.
a) Identify the halide ion present in the metal halide.
b) Calculate the number of moles of silver halide precipitated and hence deduce the number of moles of
halide ion present in the metal halide salt.
c) Calculate the mass of halide present in the metal halide salt and hence find the percentage mass of
halide in the salt.

Answer:

Explanation:

It’s D

Answer:

D. Is it wrong to change or control life forms?

Explanation:

edge 2021 :P

Answer: the last one:)

Explanation: energy cannot be destroyed but can be transfered

(called energy transfer).

Answer:

Each ion, or atom, has a particular mass; similarly, each mole of a given pure substance also has a definite mass. The mass of one mole of atoms of a pure element in grams is equivalent to the atomic mass of that element in atomic mass units (amu) or in grams per mole (g/mol).

Explanation:

The relationship between the given terms is provided below throughout the below segment.

We can say that,

→ \(1 \ mole \ in \ gram \ of \ an \ element = Atomic \ mass \ of \ an \ element\)

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Answer:

pressure= density × gravity × height

Explanation:

100 × 10 × 1.5= 1500 pa

The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.

Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.

Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.

According to the given data;

Decomposition of carbon monoxide (CO);

Oxygen produced = 3.36 g

Carbon produced = 2.52 g

We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;

Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol

Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol

Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;

0.21 mol C / (0.21 mol O) = x

Simplifying the equation, we have;

x = 1

Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.

Decomposition of carbon dioxide (CO₂);

Oxygen produced = 9.92 g

Carbon produced = 3.72 g

Following the same calculations as before;

Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol

Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol

Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;

0.31 mol C / (0.62 mol O) = y

Simplifying the equation, we have;

y = 0.5

Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.

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--The given question is incomplete, the complete question is

"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--

Answer: 19.2 mols

Explanation:

3*6.40 mol so 19.2 mols are produced. This is because the ratio of C3H8 to CO2 is 1 to 3 so there are three times as many moles of CO2 as C3H8.

According to the concept of Avogadro's number and STP conditions volume in liters of the sample is 15,388.7.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number

Number of moles is obtained as, number of atoms/Avogadro's number=4.088×10²⁴/6.023×10²³=6.78 moles on substitution in formula of PV=nRT=V=6.78×8.314×273/1=15,388.7 liters.

Thus, the volume is 15,388.7 liters of the sample.

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Answer: There you go.

Explanation:

These types of decay involve the nuclear capture of electrons or emission of electrons or positrons, and thus acts to move a nucleus toward the ratio of neutrons to protons that has the least energy for a given total number of nucleons. This consequently produces a more stable (lower energy) nucleus.

When radioactive decay occurs, the original nucleus splits into daughter nuclei and the resulting nucleus is more stable than the original nucleus. The nucleus can be of a different element than the original.

Unstable nuclei often undergo radioactive decay. In a radioactive decay, the unstable nucleus is broken up into other nuclei. Usually, the nuclei formed during radioactive decay are smaller in mass compared to the original nucleus.

Also, the resulting nucleus is more stable than the original nucleus. The nucleus can be of a different element than the original.

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The Concentration of Na₃PO₄is decreases due Common ion effect when it is added to a saturated aqueous solution of Ca₃(PO₄)₂ .

Common ion effect:

Common ion effect refers to the reduction in solubility of an ionic precipitate by adding to the solution a soluble compound that has an ion common to the precipitate. This behavior is a result of Le Chatelier's principle of equilibrium ionic association/dissociation reactions.

Solid Na₃PO₄is added to a saturated aqueous solution of Ca₃(PO₄)₂. Ca₃(PO₄)₂ and water are in balance and the products Ca²⁺ and PO₄³⁻.

Ca₃(PO₄)₂ + H₂O --> Ca²⁺+ PO₄³⁻

Na₃PO₄ --> Na⁺ + PO₄³⁻

Na₃PO₄ dissolve into the solution and forming Na⁺ and PO₄³⁻ ions.

the concentration of PO₄³⁻ ions increases, which causes the reaction equilibrium to shift to the left, which makes more Na₃(PO₄), and the concentration decreases.

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If you draw the table of the Hess law, you can use that table to obtain the enthalpy of reaction

A table called the "Hess's law table" can be created to depict how Hess's law is used. The reactants, intermediates, products, and related enthalpy changes (H) of each reaction that takes place during a chemical reaction are listed in the table.

Hess's law indicates that you can add the enthalpy changes of the separate reactions to get the total reaction's enthalpy change (H). By eliminating common species between neighboring reactions in the table, the overall reaction is achieved.

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Answer:

hi hehe I'm new here hehehe

Answer:

High levels of nitrogen dioxide are also harmful to vegetation—damaging foliage, decreasing growth or reducing crop yields. Nitrogen dioxide can fade and discolour furnishings and fabrics, reduce visibility, and react with surfaces.

1-We could use low-nitrogen fuels

2- We could also modify combustion conditions to generate less NOx. Flue gas treatment techniques, such as selective cata- lytic reduction (SCR) processes, can remove NOx

Explanation:

percentage yield = Actually yield÷ Theoretical yield × 100

The percent yield of magnesium oxide is 94.2%.

Percent yield exists as the percent ratio of actual yield to the theoretical yield. It is estimated to be the experimental yield divided by the theoretical yield multiplied by 100%. If the actual and theoretical yield ​exists exactly, the percent yield stands at 100%.

In chemistry, yield, also directed to as reaction yield, exists as a measure of the number of moles of a product created about the reactant consumed, acquired in a chemical reaction, usually represented as a percentage.

Write the balanced chemical equation.

2Mg + O₂ → 2MgO

Step 2: Compute the theoretical yield.

Based on the balanced chemical equation, 2 moles of Mg exists stoichiometrically equivalent to 2 moles of MgO.

The molar masses of Mg and MgO are 24.305 g/mol and 40.304 g/mol, respectively.

Theoretical yield= 1.2 g Mg *1mol Mg/24.305 g Mg*2 mol MgO/2 mol MgO/40.304 g MgO/1 mol MgO

=3.1839g

Calculate the percent yield,

Percent yield=actual yield/theoretical yield*100

=3.00 g/3.1839g*100

94.2%

Hence, the percent yield of magnesium oxide is 94.2%.

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Answer:

1

Explanation:

Answer:

Below

Explanation:

Heterozygous mean a dominant and a recessive gene.

S (dominant) = short needles

s (reccessive) = long needles

Parent 2 S s

Parent 1

S

s

S s

S SS Ss

s Ss ss

For an offspring to have long needles, both alleles have to be s ( recessive allele for long needle) or ss . That's only occurs in 1/4 pairing so the probability is 25%

Answer: car b

Explanation:

The oxidation number of an atom is the number of valence electrons subtracted or added to the total number of electrons in the atom. Oxidation number is an important concept in chemistry, especially in redox reactions. Nitrogen is a Group 15 element and has five valence electrons.

Nitrogen in the compounds can have oxidation states ranging from -3 to +5. As nitrogen has five valence electrons, nitrogen-containing compounds can have a range of oxidation states.

The oxidation state of nitrogen can be calculated by following these rules:

Oxidation state of nitrogen in NH3: In NH3, each hydrogen atom has an oxidation state of +1, which means the nitrogen atom must have an oxidation state of -3 to balance the total charge to zero. Oxidation state of nitrogen in NO: In NO, the oxygen atom has an oxidation state of -2, which means that the nitrogen atom has an oxidation state of +2 to balance the total charge to zero. Oxidation state of nitrogen in NO2:In NO2, each oxygen atom has an oxidation state of -2, which means that the nitrogen atom has an oxidation state of +4 to balance the total charge to zero.

Oxidation state of nitrogen in NO3-:In NO3-, each oxygen atom has an oxidation state of -2, which means that the nitrogen atom has an oxidation state of +5 to balance the total charge to zero.

Oxidation state of nitrogen in N2:N2 is a covalent molecule, which means that each nitrogen atom has an oxidation state of 0.

Rank the following nitrogen compounds in order of decreasing oxidation number for nitrogen:

NO3- > NO2- > NO2 > NH3 > N2 > NO.

So, the order of nitrogen compounds in decreasing order of oxidation number for nitrogen is: NO3- > NO2- > NO2 > NH3 > N2 > NO.

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Answer:

Sorry I was late but here you go

Explanation:

Physical weathering can affect a sample by changing the characteristics of the rock and they can be changed into boulders, cobbles, pebbles, sand, silt, clay, and colloids.

Answer:

Into what protein structure is spider silk found?

= Primary structure

I HOPE IT HELP YOU

The substance that increases [H+ ] and decreases pH when it dissociates in water is called an acid.

Acids are substances that have lower than seven pH. They are sour in taste, and they dissociate into H+ ions in the water when dissolved in water. A strong acid is a hydrochloric acid, a weak acid is a nitric acid.

They have no electrons, just protons. They turn blue litmus paper to red. Furthermore, they react with metals to form hydrogen, and they react with a base to form salts.

Thus, the substance that decreases the pH when mixed with water is acid.

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The horizontal component of velocity is constant throughout the motion. The distance traveled by the projectile is given by the equation d = V^2 sin2θ/g where d is the distance traveled.

Carl Lewis at the 1992 Olympics in Barcelona, Spain, won gold medals for the long jump (28 feet 5.5 inches).

This resulted from an initial velocity of 9.5 m/s at an angle of 40 degrees to the horizontal.Initial velocity is the initial speed and direction of a moving object at a particular instant in time.

Its direction is typically measured in degrees, with 0 degrees being to the right, 90 degrees being up, and 180 degrees being to the left. The horizontal is the axis that runs from left to right.

The angle between the horizontal and the initial velocity vector is referred to as the angle of projection. This is usually referred to as the theta symbol.

The vertical component of velocity is equal to the initial velocity multiplied by the sine of the angle of projection. This is due to the fact that velocity can be broken down into horizontal and vertical components.

The horizontal velocity is constant throughout the motion and the vertical velocity changes due to gravity.

Therefore, the vertical component of velocity is zero at the top of the motion and maximum at the bottom.

The maximum height reached by the projectile is given by the equation h = V^2 sin^2θ/2g where h is the maximum height, V is the initial velocity, θ is the angle of projection, and g is the acceleration due to gravity.

On the other hand, the horizontal component of velocity is equal to the initial velocity multiplied by the cosine of the angle of projection.

This is due to the fact that velocity can be broken down into horizontal and vertical components.

The horizontal velocity is constant throughout the motion and the vertical velocity changes due to gravity.

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Answer:

Ver explicacion

Explanation:

Un arroz con leche es una mezcla heterogénea porque está compuesto por partículas sólidas de diferentes tipos y tamaños.

El agua de mar es una mezcla homogénea de sustancias todas en la misma fase.

El magnesio es una sustancia pura y es un elemento.

La gasolina es una mezcla homogénea de sustancias comúnmente utilizadas como combustible.

Among the options provided, the substance that acts at a long distance from the site at which it is secreted is a hormone.

Hormones are chemical messengers produced by endocrine glands and released into the bloodstream. They travel throughout the body and exert their effects on target cells that may be far away from the site of secretion.

Hormones play a crucial role in regulating various physiological processes and maintaining homeostasis in the body. They act by binding to specific receptors on target cells, initiating a cascade of events that ultimately lead to a specific response. Due to their ability to travel through the bloodstream, hormones can reach distant target cells, even in different organs or tissues, allowing for widespread and systemic coordination of bodily functions.

In contrast, synaptic signals and neurotransmitters primarily function in neural communication within the nervous system. Synaptic signals occur at the synapses, which are junctions between neurons, allowing for rapid and localized transmission of signals. Neurotransmitters are chemical messengers that are released from the presynaptic neuron and bind to receptors on the postsynaptic neuron, transmitting the signal across the synapse.

Local regulators and paracrine signals, on the other hand, act over shorter distances within the immediate vicinity of their secretion. Local regulators are involved in cell-cell communication within a specific tissue or organ, while paracrine signals are secreted by one cell and act on nearby target cells.

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Answer:

Even though the two substances possess many similarities, they have some unique properties. In turn, since they have the same properties, if they were the same substance, it would make matters worse, if the same chemical was in two different places, there would not be a difference between them since they are the same, just as it is with are two different chemicals would have differing properties since they are two properties would vary from one another since they are 2 totally different things!

Explanation:

Chemically active fluids primarily aid in the mobility of dissolved silicate components and facilitate the development of the mineral grains during metamorphism.

During metamorphism, chemically active fluids that are present between the mineral grains help to promote ion movement and the re-crystallization of both old and new minerals.

Rocks that have undergone metamorphism include igneous, sedimentary, and other types of metamorphic rocks. The variations include the creation of new minerals, an increase in grain size, and adjustments to the structure or texture of the rock, depending on the chemical composition of the original rock and the degree of metamorphism.

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Answer:

e is right ▶️▶️▶️▶️▶️▶️▶️

Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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