Please help, chemistry is hard

The concept ideal gas equation is used here to determine the volume of the carbondioxide. Combustion reactions are generally highly exothermic reactions. The volume of CO₂ is

A combustion is a chemical reaction in which a fuel undergoes oxidation as a result of the reaction with an oxidizing agent which causes the release of energy in the form of heat.

15.0 °C = 288 K

The ideal gas equation is:

PV = nRT

V = nRT / P

V = 354 × 0.0821 × 288 / 0.995 = 8412.3 L

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Answer:

Explanation:

i wish i can help

From the calculation, the pH of the solution can be obtained as 0.39.

We first have to obtain the dissociation constant of the solution;

α = √Ka/C

Ka = Cα^2

Ka = 4.9 * 10^-3 * 6

Ka = 0.0294

Then we have that;

0.0294 = [x]^2/[6 - x]

0.0294 * [6 - x] = x^2

0.1764 - 0.0294 x = x^2

x^2 +  0.0294 x - 0.1764 =0

x = 0.41 M

Thus the pH of the solution is;

pH = -log[0.41]

= 0.39

pH is an important parameter in chemistry, biology, and many other fields, as it can affect the behavior and properties of substances and reactions.

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Answer:

The reaction between ferric chloride and potassium hydroxide leads to the formation of ferric hydroxide and potassium. It is a precipitation reaction in which ferric and hydroxide ion on reaction with each other results in the formation of ferric hydroxide as reddish-brown precipitate.

The percent ammonium in the new solution is 80ppm

The concentration of a compound like NaCl (sodium chloride) refers to the quantity of matter that is included in a specified amount or mass of solution.

This magnitude can be expressed through various units, comprising of molarity (moles of the material per liter of liquid), molality (moles of the part per kilogram of solvent), mass/volume percent (mass of the element per volume of fluid), and parts per million (ppm).

For instance, a fluid of NaCl with an intensity of 0.1 M (0.1 moles of NaCl per liter of solution) contains 58.44 grams of NaCl for every liter of water, whereas a concoction with an intensity of 1% (mass/volume percent) comprises 10 grams of NaCl per 100 ml of fluid.

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The correct answer is "Particles are more likely to collide with enough energy to form an activated complex," which is the last option, as when the temperature of a reaction increases, the average kinetic energy of the particles increases.

Chemical reactions require a certain amount of energy to occur. This energy is called activation energy. In order for reactant molecules to undergo a chemical reaction, they must overcome the activation energy barrier. This barrier is like a hill that reactants must climb over to reach the product state. One way to provide the energy required to overcome the activation energy barrier is to increase the temperature of the system. This is because temperature is a measure of the average kinetic energy of particles in a system. As the temperature increases, the kinetic energy of the particles also increases. This means that they are moving faster and colliding with greater energy.

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The balanced  chemical equations with suitable coefficients are 2 Cu(IO₃) + K₂(CO₃) → 2 KIO₃ + Cu₂CO₃, Fe₂(CO₃)₃ + 6 Cs → 3 Cs₂(CO₃) + 2 Fe,

2 NaClO₃ → 2 NaCl + 3 O₂.

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 .

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There are unique interactions and relationships which are involved in the transportation of energy. The energy which is produced and captured once is distributed throughout various living organisms. This transfer of energy is called the food web.

The decomposers of the food web are known as the organisms which tend to degrade the dead living organisms of an ecosystem. Some examples of decomposers are fungus, bacterium or invertebrates, etc.

The decomposers help in the energy flow of the ecosystem and help in replenishing the fertility of soil through secreting the digestive enzymes over dead plants and animals and provide nutrients to the soil.

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When a jar containing saline solution is exposed to sunlight, its liquid content gradually diminishes and eventually forms crystals as a result of the evaporation process.

The energy from the sun's heat accelerates the movement of molecules in saltwater, which leads to their subsequent release from the liquid surface as water vapor. As a result of this process, the moisture transforms into gas and ascends, scattering throughout the atmosphere.

The concentration of salt in the remaining liquid increases as water evaporates from saltwater, as salt is unable to evaporate like water. As time passes, the salt concentration within the water triples to a point where it becomes incapable of remaining dissolved and commences the process of crystal formation.

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The three main components of electrolytic cells are cathode, anode and electrolyte. The negatively charged electrolytic cells are cathode and the positively charged electrolytic cells are anode.

An electrolytic cell can be defined as the electrochemical device which uses the electrical energy to perform a non-spontaneous redox reaction. They are mainly used for the electrolysis of certain compounds.

Here the anode cell is:

3H₂O (l) + I⁻ (aq) → IO⁻₃ (aq) + 6e⁻ + 6H⁺ (aq)

cathode cell is:

14H⁺ (aq) + Cr₂O₇²⁻ (aq) + 6e⁻ → 2Cr³⁺ (aq) + 7H₂O (l)

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The partial pressure of O₂ is 0.954 atm

The moles O₂ that formed is 0.000859 moles

The mass of NaNO₃ that reacted is 0.146 g.

The balanced chemical equation for the reaction is given below:

Using Dalton's Law of partial pressures:

The partial pressure of O₂ = Total pressure - Partial pressure of water vapor

The partial pressure of O₂ = (0.98 atm) - (0.026 atm)

The partial pressure of O₂ is 0.954 atm

b. Using the ideal gas law to determine the moles of oxygen gas formed:

PV = nRT

Making subject of the formula:

n = PV/RT

n = (0.954 * 0.0230)/(0.0821 * 295.15)

n = 0.000859 moles

Moles of O₂ formed = 0.000859 moles

c. the mass of NaNO₃ that reacted is calculated as follows:

mass NaNO₃ = moles NaNO₃ x molar mass NaNO₃

molar mass NaNO = 84.99 g/mol

From the mole ratio of the reaction, moles of NaNO₃ = 0.000859 moles * 2

moles of NaNO₃ = 0.001718 moles

mass NaNO3 = 0.001718 * 84.99

mass NaNO3 = 0.146 g NaNO₃

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2 M solution of a compound can be made by dissolving 2g of compounds in 1 liter of water. Either by diluting the appropriate volume of a more concentrated solution also known as a stock solution to the desired final volume or by dissolving a known mass of solute in a solvent, solutions of known concentration can be prepared.

For example, when we add one part by weight of powder to 19 parts by weight of the solvent is used to make a 5% solution. For 1% solution, the addition of 1gm of NaCl to 100L of water. which is the final volume of the solution.

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Reactivity is the propensity of an element to gain or lose electrons. The most reactive metals are alkaline metals.

Reactivity in chemistry is an indication of how easily a substance reacts chemically. The chemical may react on itself or with other atomic particles or compounds, and in either case, energy will typically be released. The most reactive substances and elements have the potential to spontaneously or explosively ignite.

Periodic trends (patterns in the Periodic Table) can be used to anticipate an element's reactivities. Let's begin with cyclical tendencies. Reactivity is the propensity of an element to gain or lose electrons. The most reactive metals are alkaline metals (Group 1) because they have the highest propensity to lose electrons.

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The statement that is true is that It is endothermic and DH equals +91.8 kJ.

We can see that in this case that the heat of the reaction which we cam also call the enthalpy of the reaction is positive. Let us know that when we have a positive enthalpy what we have is an endothermic reaction.

Endothermic reactions are typically observed as a decrease in temperature, as energy is absorbed from the surroundings to fuel the reaction. Examples of endothermic reactions include the melting of ice.

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Missing parts;

Given the balanced equation representing a reaction at 101.3 kPa and 298 K:

N2(g) + 3H2(g) => 2NH3(g) + 91.8 kJ

Which statement is true about this reaction?

(1) It is exothermic and DH equals -91.8 kJ.

(2) It is exothermic and DH equals +91.8 kJ.

(3) It is endothermic and DH equals -91.8 kJ.

(4) It is endothermic and DH equals +91.8 kJ.

The shape of a graph that shows the velocity in the x direction (v) versus time when the object is accelerating in the x direction would be a curve with a non-zero slope.

The rate at which an object's displacement changes in relation to a frame of reference is its velocity. The direction of the movement of the body or the object is defined by its velocity.

According to the equation v = s/t, velocity (v) is a vector quantity that quantifies displacement (or change in position, s), over the change in time (t).

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Answer: I expect a horizontal line (slope 0). As time increases, the velocity in the x direction stays about the same.

Explanation: Edmentum sample answer

If the weather seems to have a constant pattern that has barely been or has not been changed, you can assume that there will be a greater chance the weather pattern will remain constant, or at least similar to the pattern.

Equilibrium in a chemical reaction is the state of a system in which the rate of the forward reaction is equal to the rate of the reverse reaction.

In a chemical reaction, chemical equilibrium is the state in which both the reactants and products are present in concentrations which have no further changes.

According to this question, the reactants (blue line) equates the products (red line) in the time, T2.

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A cycloalkane with the chemical formula C6H12 is cyclohexane. Non-polar describes cyclohexane.

Thus, Colorless and combustible, cyclohexane has a characteristic detergent-like stench that is reminiscent of cleaning products.

The industrial manufacturing of adipic acid and caprolactam, which are building blocks for nylon, uses cyclohexane primarily.

cyclohexanone and cyclohexanol that serves as the starting point for the production of adipic acid and caprolactam, which are both precursors to nylon. Annual production of cyclohexanone and cyclohexanol totals several million kilos.

Thus, A cycloalkane with the chemical formula C6H12 is cyclohexane. Non-polar describes cyclohexane.

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The mass in grams of CO₂ in the 5.3 L container at 101 kPa and 280 K is 10.1 grams of CO₂

The mass in grams of CO₂ can be calculated using the Ideal Gas Law equation:

where:

P is pressure = 101 kPa or 0.998 atm

V is volume = 5.3 L

n is the number of moles of gas = ?

R is the molar gas constant = 0.08206 L·atm/(mol·K)

T is the temperature = 280 K

solving for n;

n = PV/(RT)

n = (0.998 atm * 5.3) /(0.08206 * 280 K)

n = 0.229 moles of CO₂

Mass of CO₂ = number of moles * molar mass

molar mass of CO₂ = 44.01 g/mol

mass of CO₂ =  0.229 × 44.01

mass of CO₂ = 10.1 g

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Cutting or tearing a strip of cardboard sufficiently large to entirely enclose the Styrofoam cup's mouth. This is the modification for making on the coffee cup calorimeter.

A coffee cup calorimeter without a cover serves as the basic component of a coffee cup calorimeter. A thermometer with its bulb below the water's surface can be inserted through the cup's lid after the cup has been partly filled using an established quantity of water.

The quantity of heat that was either absorbed or generated  throughout the reaction is determined using the alteration in water temperature. Cutting or tearing a strip of cardboard sufficiently large to entirely enclose the Styrofoam cup's mouth. This is the modification for making on the coffee cup calorimeter.

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The volume of the air when the breath is warm to body temperature (37.0°C) in the lungs is 530.4 mL

First, we shall list out the given parameters from the question. This is given below:

The volume of the breath when it is warm to body temperature (37.0°C)    can be obtained by using Charles' law equation as shown below:

V₁ / T₁ = V₂ / T₂

450 / 263 = V₂ / 310

Cross multiply

263 × V₂ = 450 × 310

263 × V₂ = 139500

Divide both side by 263

V₂ = 139500 / 263

V₂ = 530.4 mL

Thus, the volume is 530.4 mL

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The chemical name for the compound CH3CH₂CH₂CH3 is butane.

Alkanes are any acyclic saturated hydrocarbon with a carbon to carbon single bond e.g. methane, ethane etc.

Alkanes have a general molecular formula of CnH2n+2. The number of carbon atoms determines the name of the alkane member.

According to this question, a chemical compound with the molecular formula; CH3CH₂CH₂CH3 is given. This compound posseses 4 carbon atoms and 10 hydrogen atoms, hence, is butane.

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Ba(NO₃)₂ has the following percentage composition: 52.6% Ba, 10.7% N, and 36.7% O.

The molar mass of Ba(NO₃)₂ is:

Ba: 1 x 137.33 g/mol = 137.33 g/mol

N: 2 x 14.01 g/mol = 28.02 g/mol

O: 6 x 16.00 g/mol = 96.00 g/mol

Adding these up gives us a total molar mass of 261.35 g/mol.

The mass percent of each element is then:

Ba: (137.33 g/mol / 261.35 g/mol) x 100% = 52.6%

N: (28.02 g/mol / 261.35 g/mol) x 100% = 10.7%

O: (96.00 g/mol / 261.35 g/mol) x 100% = 36.7%

Therefore, the percentage composition of Ba(NO₃)₂ is: 52.6% Ba, 10.7% N, and 36.7% O.

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The new temperature of the neon gas, with a volume held constant, is approximately -253.6°C.

Gay-Lussac's law states that the pressure exerted by a given quantity of gas varies directly with the absolute temperature of the gas.

It is expressed as;

P₁/T₁ = P₂/T₂

Given that:

Plug the given values into the above formula and solve for the final temperature.

P₁/T₁ = P₂/T₂

P₁T₂ = P₂T₁

[tex]T_2 = \frac{P_2T_1}{P_1}\\ \\ P_2 = \frac{ 0.2 * 293.15}{3}\\ \\P_2 = 19.543 K[/tex]

Now, convert from Kelvin to celsius

P₂ = 19.543K − 273.15

P₂ = -253.6°C

Therefore, the new temperature is -253.6°C.

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Answer:

Specific heat capacity is a measure of how much energy is needed to raise the temperature of a material and is defined as follows:

In an ecosystem, the best method  for the preservation of water quality is  that humans should cease all recreational and agricultural uses of water resources.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other. Components present include air, water, soil,etc.

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The acidity or alkalinity of a solution depends upon its hydronium ion concentration and hydroxide ion concentration. The pH scale is introduced by the scientist Sorensen.

The pH of a solution is defined as the negative logarithm to the base 10 of the hydronium ion concentration in moles per litre.

a. Concentration of NaOH = 0.200 M

Concentration of HCl = 0.200 M

Total volume = 50 + 30 = 80 mL = 0.08 L

The neutralization reaction between  NaOH and HCl is:

OH⁻  + H⁺  ---------->  H₂O

Then,

n(H⁺) = 0.03 × 0.200 = 0.006 moles

n(OH⁻) = 0.05 × 0.200 = 0.01 moles

Remaining moles of OH⁻ = 0.01 - 0.006 = 0.004

pOH = -log [OH⁻] = 2.39

pH + pOH = 14

pH = 14 - pOH = 14 - 2.39 = 11.61

b. pH at the equivalence point is about pH 7.

c. Total volume = 0.11 L

n(H⁺) = 0.06 × 0.200 = 0.012 moles

n(OH⁻) = 0.05 × 0.200 = 0.01 moles

Remaining moles of H⁺ = 0.012 -0.01 = 0.002

Concentration of H⁺  is 0.002 M / 0.11 L = 0.01818 moles/L

pH = - log [ H⁺ ]

pH = - log [ 0.01818 ]

pH = 1.74

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The balanced equation is: Pb(C2H3O2)2 + CO2 + H2O → PbCO3 + 2 HC2H3O2

In a balanced chemical equation, the number of atoms of each element is the same on both sides of the equation. Thus, the balanced equation of the reaction is:

Pb(C2H3O2)2 + CO2 + H2O → PbCO3 + 2 HC2H3O2

The coefficients used to balance the equation are:

1 Pb(C2H3O2)2 + 1 CO2 + 1 H2O → 1 PbCO3 + 2 HC2H3O2

After balancing the equation, we can see that one molecule of lead(II) acetate reacts with one molecule of carbon dioxide and one molecule of water to produce one molecule of lead(II) carbonate and two molecules of acetic acid.

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