wich statement indicates that a chemical reaction has taken place

The balanced chemical equation for Na₃PO₄ and FeCl₂:

2 Na₃PO₄ (aq)  + 3 FeCl₂ (aq)   →  Fe₃(PO₄)₂ (s) +  6NaCl (aq)

The net ionic equation of HNO₃ and LiOH:

H⁺(aq)  + OH⁻(aq) →  H₂O (l)

The net ionic equation is an equation of a chemical reaction that expresses only elements,  ions, or compounds, that directly participated in that chemical reaction.

We can write a balanced  chemical equation for Na₃PO₄ and FeCl₂:

2 Na₃PO₄ (aq)  + 3 FeCl₂ (aq)   →  Fe₃(PO₄)₂ (s) +  6NaCl (aq)

The complete ionic equation can be written for reaction of Na₃PO₄ and FeCl₂:

6Na⁺ (aq) + 2PO₄³⁻ (aq)  +  3 Fe³⁺ (aq) + 6Cl⁻ (aq)  → Fe₃(PO₄)₂ (s) +  6 Na⁺ (aq) +  6Cl⁻ (aq)

The balanced chemical equation for  HNO₃ and LiOH:

HNO₃ (aq)  + LiOH (aq)  →  H₂O (l)  +  LiNO₃ (aq)

The complete ionic equation for HNO₃ and LiOH::

H⁺(aq)  + NO₃⁻ (aq)  +  Li⁺(aq)  +  OH⁻ (aq)   →  H₂O (l) +  Li⁺(aq) + NO₃⁻ (aq)

The net ionic equation of HNO₃ and LiOH:

H⁺(aq)  + OH⁻(aq) →  H₂O (l)

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At volume 6.78ml, pH will be equal to pKa of the acid.

According to the Henderson- Hasselbach equation,

pH= pKa + log {A-}/ {HA}

where {A-} is the concentration of conjugate base and

{HA} is the concentration of weak acid

At the equivalence point, the volume of base added is just enough to exactly neutralize all the acid.

At one half of this volume of added base, called the half equivalence point, enough has been added to neutralize half of the acid. Since, half of the acid reacted to form A-, the concentration of A- and HA-, at the half equivalence point are the same.

ph= PKA+log1

pH= pKa (log1=0)

Therefore, V eq = 13.57ml

V 1/2 eq= 13.57/2

=6.78ml

Hence, at volume 6.78ml, pH will be equal to pKa of the acid.

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The net force of the car speeding with of 5000N of force is 4100N force and it is not even near to be balanced.

The net force is the total of all the forces acting on an object, according to its definition. Mass can be accelerated by net force. Whether a body is at rest or in motion, another force is at work on it. When a system has a lot of forces acting on it, the phrase "net force" is used.

We have given,

Applied force Fa = 5000N

Frictional force Ff = -400N

Force exerted back by zombie Fz = -500N

The net force formula is given by

[tex]F_{Net}[/tex] = F₁ + F₂ + F₃

[tex]F_{Net}[/tex] = 5000 - 400 - 500

[tex]F_{Net}[/tex] = 4100N

Therefore, The net force of the car speeding with of 5000N of force is 4100N force and it is not even near to be balanced.

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The molecular formula bonattite is CuSO₄·3H₂O.

Two or more atoms that have been chemically bonded make up a molecule. A molecular formula is the chemical representation of a molecular compound that lists the types and quantities of atoms that make up each molecule.

We have 0.0281 moles H₂O.

We have 0.00936 moles Copper.

We have 0.00936 moles sulfate.

Mole ratio : For 1 mol Cu we have 1 mol sulfate and 3 moles H₂O.

The molecular formula is  CuSO₄·3H₂O

After heating the sample lost 0.506 grams of mass

After reacting with aluminum wire, 0.595 g of Cu was recovered.

So, Moles H₂O = mass H₂O / molar mass H₂O

Moles H₂O = 0.506 grams / 18.02 g/mol

Moles H₂O = 0.0281 moles H₂O

Now, Moles Cu = 0.595 grams / 63.55 g/mol

Moles Cu = 0.00936 moles Cu

For 1 mol of Cu we have 1 mol (SO₄)⁻²

For 0.00936 moles Cu we have 0.00936 moles (SO₄)⁻²

We have 0.00936 moles CuSO₄.

Step 5: Calculate the molecular formula

The molecular formula is CuSO₄·H₂O

To find x we have to divide the number of moles H₂O by the number of moles CuSO₄

x = (0.0281 mol of H2O) / (0.00936 mol of CuSO₄)

x = 3.00

The molecular formula is  CuSO₄·3H₂O.

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Here is the complete question " In this lab, we do not measure the amount of chlorine in the sample, We need the amount of chlorine to determine the formula of the compound. How do we determine the amount of chlorine in the compound? The mineral bonattite is known to be a copper sulfate hydrate. 2.000 grams was heated to release the water for form the anhydrate. The sample lost 0.506 g of mass. After reacting with aluminum wire, 0.595 g of copper was recovered. How many motes of water, copper and sulfate were in the compound? What is the mole ratio of these 3 components? What is the formula of bonattite?".

The mass of the cart needs to accelerate at 0.75 m/s² is 166.6kg.

The net force on an object is zero but its velocity and direction of motion remain unchanged. The net force is the sum of all horizontal or vertical forces. When the box is not moving, the friction plus the applied force is zero, so the net force is zero. The answer is zero. An object moving at constant velocity has zero acceleration, so the net force is zero.

Newton's second law of motion can be observed by comparing the acceleration of a car and a truck after the same force is applied. It's easy to see that the car accelerates faster than the truck after pushing the car and the truck with equal force. Friction is the force that resists movement between contact surfaces. Friction works in our favor and against us.

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Answer:

This is because oxygen requires two electrons to gain stability, while hydrogen has only one olectron, therefore two hydrogen atoms are required

The fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.

Fruit basket is defined as a gift basket filled with a variety of fruits.

A fruit basket can be called as a punnet is a compact box or square basket used for gathering, transporting, and selling fruits and vegetables, typically for small berries.

As one basket has 6 strawberries.

So, for completing 725 order we need

= 725 / 6

= 120.8 = 120 strawberries

Thus, the  fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.

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Answer:

Option A

Explanation:

Because B, C, D, or E are impossible, protons cannot change, electron = protons.

The difference between drying the organic layer and solvent evaporation is explained below.

When an organic component is extracted, there is always the possibility of traces of water or moisture remaining in the organic layer. To eliminate water from the organic layer, the organic layer is frequently treated with sodium sulfate, a process known as drying the organic layer. The organic layer is concentrated once it has been freed of water by evaporating the organic solvent. There is always some water remaining in the organic layer after aqueous extractions. Adding anhydrous sodium sulfate for drying the organic layer, eliminates this water by creating sodium sulfate hydrate, which is likewise a solid and so easily filtered away.

Solvent evaporation is the process of emulsifying polymer in aqueous phase and dispersing it in a volatile solvent such as dichloromethane, chloroform, or ethyl acetate. The solvent is then evaporated using high heat, vacuum, or continuous stirring. By placing the solution in an open container, solvent evaporation occurs (an Erlenmeyer, evaporating dish, beaker, vial). The solvent is boiled out by placing the container on a heat source (steam bath, hot plate, heating mantle, sand bath).

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Answer

Mg(OH)2 is the limiting reactant

Mass of MgCl2 produced = 3.02 g

Explanation

Given: The balanced chemical equation

mass of Mg(OH)2 = 1.85 g

mass of HCl = 3.71

Solution

Mg(OH)2

HCl

Therefore Mg(OH)2 is the limiting reactant.

Calculation of MgCl2 mass

Milk : Homogenous

glass : Homogenous

sugar : compounds

bottled spring water  : Homogenous

distilled water : compounds

air  : Homogenous

alloy bicycle frame  : Homogenous

propane : compounds

baking soda  : Homogenous

When two liquids totally mix, they produce a homogenous combination.

Complete dissolution of a solid in a liquid

When there is no phase difference in a combination, it is said to be homogenous. The composition of a homogeneous mixture is constant and consistent across the whole system.

A mixture of water and ethanol, for instance, is an example of a homogeneous mixture since the two substances are miscible in all amounts.

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Zircon and detrital quartz have the potential to provide information regarding scalar changes to the Earth's weathering processes and silicon isotope composition. Due to the fact that there are currently few data on the Si isotope equilibrium fractionation of minerals, determining the source melt Si isotope composition from out-of-context minerals is difficult.

The term "quartz" comes from the Polish words "kwardy" and "twardy," both of which imply "hard" in English. Quartz is an igneous rock made up of silicon and oxygen atoms in a continuous structure called silicon-oxygen tetrahedra (SiO4). The ultimate chemical formula of quartz is SiO2, which is recognized in science as the result of the sharing of each oxygen atom between two tetrahedra atoms. In terms of mineral abundance in the continental crust of the earth, quartz is second only to feldspar. The two types of quartz which are known as regular alpha quartz and high-temperature beta quartz are both chiral materials. All of the alpha-to-beta quartz transformations take place at temperatures below 573 degrees Celsius.

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Answer:

6.93

Explanation:

(0.07)6 + (0.93)7 = 0.42 + 6.51 = 6.93

Answer:

C. Lead(IV) Chloride

Explanation:

Because PbCl4 has a transition metal we need to indicate the ionic charge using Roman numerals in parenthesis. This is placed directly after the metal.

The name of PbCl₄ is lead (IV) chloride. Therefore, option C is correct.

Lead (IV) chloride (PbCl₄) is a hypothetical compound, it does not exist under normal conditions. The highest oxidation state that lead typically exhibits is +4, but it is highly unstable and tends to be disproportionate to lower oxidation states.

Lead commonly forms compounds such as lead (II) chloride (PbCl₂), where lead has an oxidation state of +2. In PbCl₂, each lead atom is bonded to two chloride ions. This is the most stable and commonly observed form of lead chloride.

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The main points of Dalton's atomic theory is Atoms are not indivisible and all atoms of an element are not identical.

Atoms are the minuscule, indivisible building blocks of all stuff.

A certain element's atoms are all the same mass, size, and other characteristics. Nevertheless, the characteristics and mass of atoms from various elements varies.

Atoms are eternal and cannot be generated or destroyed. Atoms also can not be separated into smaller particles.

Compounds can be created by combining atoms of various elements in specific whole-number ratios.

In chemical reactions, atoms can be joined, separated, or rearranged.

The fact that an atom may be further divided into protons, neutrons, and electrons disproves the idea that it is indivisible. The smallest particle that participates in chemical processes is an atom, nevertheless. Dalton asserts that the atoms of the same element are identical in every way.

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The radiant energy that is absorbed by the plant in the process of photosynthesis is stored in the plant in the form of chemical energy contained in sugars.

The term photosynthesis has to do with the process by which there is a combination of water and carbon dioxide in the plant such that the products that are formed are sugar and oxygen. The oxygen is released back into the environment.

We know that radiant energy from the sun is what acts as the catalyst that makes the reaction possible. The combination occurs in the chloroplasts of the plant cells .

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Answer: its thee 3rd one I'm pretty sure.

Explanation:

Answer:

C

Explanation:

They are chemically bonded is the truest of all

Answer:

3Mg + Mn2O3 --> 3MgO + 2Mn

Explanation:

To know whether an equation is balanced, make sure to count how many atoms of a specific element are in each side.

In these options, the only one that has the same amount on each side is option 2.

On the reactant side, we have:

3 Mg,  2 Mn,  and 3 O

On the product side, we have:

3 Mg,  2 Mn,  and 3 O

If you have a coefficient in front of the molecule, that means that there is that amount of each element. For example 3 MgO, there is 3 Mg and 3 O.

If you have a subscript (the small number) after the element, that means there is specifically that amount of atoms of that element. For example Mn2O3, there is specifically 2 Mn and 3 O.

By using the Henderson-Hasselbalch equation, the pH of the given solutions are 4.17, 8.72, 3.83 respectively.

The Henderson-Hasselbalch equation can be used to determine how much conjugate base and acid should be mixed to create a buffer solution with a certain pH.

pH = pKa + [tex]log_{10}[/tex] ([[tex]A^-[/tex]]/[HA]), where [[tex]A^-[/tex]] stands for the molar concentration of the conjugate base (of the acid), and [HA] for the molar concentration of the weak acid, is how the Henderson-Hasselbalch equation is expressed.

As per Henderson-Hasselbalch equation,

For weak acid buffer, pH = pKa + log ([salt] / [acid])

For weak base buffer, pH = pKa + log ([salt] / [base])

(a) pKa of HCOOH = 3.77

Therefore, pH = pKa + log ([salt] / [acid])

pH = pKa + log ([HCOONa] / [HCOOH])

pH = 3.77 + log (0.250/0.100)

pH = 4.17

(b) pKa of Pyridine = 8.77

Therefore, pH = pKa + log ([salt] / [base])

pH = pKa + log ([Pyridinium chloride] / [Pyridine])

pH = 8.77 + log (0.450/0.510)

pH = 8.72

(c) pKa of HF = 3.17

Therefore, pH = pKa + log ([salt] / [acid])

pH = pKa + log ([NaF] / [HF])

pH = 3.17 + log [(0.10x 125) / (0.05 x 55)]

pH = 3.83

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An argument about subclaim 2 about bacteria from fecal transplants and how it can help the patient's body produce immune cells that kill invading bacteria is given below:

This bacteria that is gotten from fecal transplants can help boost immunity and kill harmful and invading bacteria, they do this by filling up the space in the gut, and this helps to fight invading bacteria.

This refers to the free-living organisms that can be found in a biological cell of an organism.

Hence, we can see that an argument about subclaim 2 has been given above and is well explained.

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The frequency and energy of one photon of violet light is 7.317x10^14 s-1, 4.85x10^-19 J, and the energy of 1 mol violet is 291.867 J and the energy of violet light is greater than the energy of red light.

The wavelength is 410 nm (1nm=10^-9 m)

=410x10^-9 m

=4.10x10^-7 m

Frequency is the speed of light upon the wavelength

f=3.0x10^8/4.1x10^-7

f=7.317x10^14 s-1

The energy of a photon is hc/lamda

E=6.626x10^-34x3.0x10^8/4.10x10^-7

E=4.85x10^-19 J

For 1-mole photon energy of a photonxavogadro number

4.85x10^-19x6.02x10^23

291867.23 J

291.867 kJ

The energy of red light is 6.626x10^-26x3.0x10^8/7.0x10^-7

E=2.84X10^-19 J

The energy of violet light is greater than the energy of red light.

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The concentration of the given solutions based on the titration is given below:

1. concentration of NaOH is 1.6 mol/dm³

2. concentration of NaOH is 0.8 mol/dm³

3. concentration of NaOH is 2.4 mol/dm³

4. concentration of KOH is 1.0 mol/dm³

A titration reaction is a reaction in which a solution of known concentration and volume is reacted with a given volume of a solution of unknown concentration in order to determine the unknown concentration of the second solution.

1. Volume of H₂SO₄ =  20 cm³

The concentration of H₂SO₄= 1.0 mol/dm³

Volume of NaOH reacted =  25 cm³

Mole ratio of NaOH and  H₂SO₄ = 2 : 1

The concentration of NaOH = 20 * 1.0 * 2/25

The concentration of NaOH = 1.6 mol/dm³

2.  Volume of HNO₃ =  20 cm³

The concentration of HNO₃= 1.0 mol/dm³

Volume of NaOH reacted =  25 cm³

Mole ratio of NaOH and  HNO₃ = 1 : 1

The concentration of NaOH = 20 * 1.0 / 25

The concentration of NaOH = 0.8 mol/dm³

3.  Volume of H₃PO₄ =  20 cm³

The concentration of H₃PO₄ =  1.0 mol/dm³

Volume of NaOH reacted =  25 cm³

Mole ratio of NaOH and  H₃PO₄ = 3 : 1

The concentration of NaOH = 20 * 1.0 * 3 / 25

The concentration of NaOH = 2.4 mol/dm³

4. Volume of H₂SO₄ =  25 cm³

The concentration of H₂SO₄= 0.5 mol/dm³

Volume of KOH reacted =  25 cm³

Mole ratio of KOH and  H₂SO₄ = 2 : 1

The concentration of KOH = 25 * 0.5 * 2 / 25

The concentration of KOH = 1.0 mol/dm³

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This process happens in such a way that total mechanical energy, equal to the sum of the kinetic and potential energies, is conserved.

Potential and kinetic energy are sources from which mechanical energy is generated by converting them into power. Turbines that are powered by steam, water, wind, gas, or liquid fuels are a few examples of this. Before being employed as power, machines are frequently used to convert various sources of energy.

As long as there is no energy loss via friction, the system's mechanical energy remains constant. When the speed increases, the energy would become kinetic energy. As long as there is no energy loss via friction, the system's mechanical energy grows.

When an immovable item starts moving, mechanical energy is converted into kinetic energy.

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The mass of Carbon dioxide gas formed is found to be 0.536g by using the partial pressure and the ideal gas law.

The term "partial pressure" refers to the pressure that one gas in a combination imposes. Partial pressure refers to the pressure exerted by a gas in a gas mixture if it alone inhabited the entire volume occupied by the combination.

We may apply the ideal gas law to address problems related to temperature, volume, pressure for a gas in a mixture if we have a mixture of ideal gases.

Let x atm be the initial partial pressure of oxygen and 2.2 – x atm of carbon monoxide.

           [tex]2CO (g) + O_2 (g) \rightarrow 2CO_2 (g)[/tex]

I:          2.2-x            x

C:        -2y              -y            2y

E:       2.2-x-2y       x-y          2y

Therefore,

(2.2 – x – 2y) + (x – y) + 2y = 1.9

2.2 – y + 1.9

y = 2.2 – 1.9

y = 0.3 atm

Partial pressure of [tex]CO_2[/tex] (g) formed = 2y = 0.6 atm

Now,

PV = nRT

PV = (Mass/Molar mass) x RT

Mass = (Molar mass x PV) / RT

Mass = 44 x 1atm x 1L / 0.082 x 1000K

Mass = 0.536g

Result:

The mass of carbon dioxide gas formed is found to be 0.536g.

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The molecule name of some molecules you made will be Cl2O7 namely dichlorine heptoxide and S2Cl2 namely disulfur dichloride.

Molecule-shaped inorganic substances are known as molecular compounds. Examples include common compounds like water (H2O) and carbon dioxide (CO2). When compared to ionic compounds like sodium chloride, these compounds are very different (NaCl).

Metal atoms lose one or more of their electrons to nonmetal atoms, resulting in the formation of ionic compounds. Electrostatic attraction draws the resulting cations and anions together.

So what unifies the atoms of a molecule? The atoms in a molecule share their electrons in a way that results in the formation of bonds between atoms rather than ions. Two of these bonds exist between the carbon atom and one of the two oxygen atoms in a molecule of carbon dioxide.

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The reaction between a sample containing chloride ions with excess Lead (II) nitrate leads to the formation of [tex]PbCl_2[/tex] in the form of precipitate.

a) The precipitate formed in the reaction of excess Lead (II) nitrate and chloride ions is [tex]PbCl_2[/tex].

Total ionic is [tex]2Cl^- + Pb(NO_3)_2 \rightarrow PbCl_2 (ppt) + 2NO_3^-[/tex]

Net ionic is [tex]2Cl^- + Pb^+ \rightarrow PbCl_2 (ppt)[/tex]

b) Excess Lead (II) nitrate was used in the reaction to precipitate each and every chloride ion.

c) The total mass of [tex]PbCl_2[/tex] = 2.686 - 0.923 = 1.763g

Molar mass of [tex]PbCl_2[/tex] = 278g/mol

Therefore, moles of [tex]PbCl_2[/tex] = 1.763/278 = 6.342 x [tex]10^{-3}[/tex]

d) No. of moles of chloride = 2 x moles of [tex]PbCl_2[/tex] = 12.684 x [tex]10^{-3}[/tex]

Mass of chloride = 35.5 x 12.684 x [tex]10^{-3}[/tex]

Mass of chloride = 0.45g

e) % of chloride = 0.45/0.897 x 100 = 50.2%.

f) No, the mass of the sample is not same as the mass of the precipitate formed during the reaction.

The complete question is:

A 0.897g sample containing chloride ion is treated with excess lead (II) nitrate. The lead (II) chloride precipitated is filtered into a filter paper that weighed 0.923g. After washing and drying the precipitate+ filter paper weighed 2.686g. Calculate the following:

a) Write the total ionic and net ionic equation for the reaction producing the precipitate:

total ionic:

net ionic:

b) Why was excess lead (II) nitrate used in the above procedure?

c) moles of lead (II) chloride formed:_______

d) Moles of chloride present in the sample__________ and Mass of chloride present in the sample _________

e) % of chloride in the sample: ___________

f) Is the mass of the sample same as the mass of precipitate? _________

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The third and last allotropic form of carbon, following diamond and graphite, is C70 fullerene. The name C70 fullerene refers to the fullerene molecule with 70 carbon atoms.

Let's think about the molecule of carbon dioxide. Since we are aware of its chemical formula, CO2, we can infer that each mole of carbon dioxide comprises 6.02 x 1023 molecules.

The Avogadro's constant is a factor that's used to estimate how many particles are present in a specific substance.

The expression for Avogadro's constant in scientific notation is:

6.02214076×10²³ mol⁻¹.

The amount of particles in 1 mole of a substance is determined by Avogadro's constant, a proportionality factor.

It is comparable to 602,252,000,000,000,000,000,000,000 in ordinary units.

In this way, the avogadro constant can be written as 6.022140761023 mol 1 or 602,252,000,000,000,000,000.

One mole of carbon and two moles of oxygen make up one mole of CO2, or 6.023 x 1023 C atoms and 12.04 x 1023 O atoms, respectively. Avogadro's number, which equals 6.023 x 1023, indicates how many atoms or molecules are contained in one mole of a substance. 6.023 x 1023 CO2 molecules make up one mole of carbon dioxide.

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Answer:

The temperature is 336.9K.

Explanation:

To calculate the temperature of CO2, it is necessary to replace the values of CO2 molar mass (0.044kg/mol), gas constant (R=8.314J/mol.K) and in this case the root mean square velocity (4.37x10^2m/s) in the root mean square velocity formula:

So, the temperature is 336.9K.

Boyle’s law is supported by the following options - (a) product of pressure and volume is constant, (c) decrease in volume leads to increase in pressure, and (d) decrease in pressure leads to increase in volume.

Boyle's law, an experimental gas law, states that as a container's capacity rises, a gas's pressure tends to drop.

According to Boyle's law, in a closed system with constant temperature and gas volume, the absolute pressure a given mass of an ideal gas exerts is inversely proportional to the volume it occupies.

According to this, the volume of a gas is inversely proportional to the pressure it exerts at a given temperature. In other words, a gas will condense to fit into an enclosed area when it is poured into it, but the pressure it exerts on the container will rise.

Therefore, (a) the product of the pressure and volume of a gas is constant, (c) The pressure will increase with a decrease in the volume of the gas, and (d) the pressure decreases with an increase in the volume of the gas.

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