Which change of state involves an absorption of energy?

The type of movement that occurs in the plate movement listed above include the following:

These are gigantic pieces of the Earth's crust and uppermost mantle and are made up of oceanic crust and continental crust.

A convergent boundary as the name implies occurs when lithospheric plates are moving towards one another.

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Answer:

26

Explanation:

The number of electrons and protons are equal.

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Answer:

A substance with pH 2 should be considered a strong acid.

Explanation

ph is a measure of how acidic or basic water is. The range goes from 0-14, with 7 being neutral.

pH of less than 7 indicate acidity and pH greater than 7 indicates base. So , the intensity of the acidic products increase as the pH decrease from 6 to 0 ,i.e. lower the value of pH higher will be the acidity.

With  pH 2 given in the question it is considered as a strong acid.However , pH 2 acids are less acidic than acids having pH 0 and 1 but more acidic in compare to pH 3-6.

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Reagents that are entirely consumed by a chemical reaction are known as limiting reagents.

Thus, They are additionally known as limiting reactants or limiting agents. A predetermined quantity of reactants are necessary for the reaction to be completed, according to the stoichiometry of chemical reactions.

In the aforementioned reaction, 2 moles of ammonia are created when 3 moles of hydrogen gas react with 1 mole of nitrogen gas.

In most cases, this reactant dictates when the reaction will end. The reaction stoichiometry can be used to determine the precise quantity of reactant that will be required to react with another element. The limiting agent is determined by the mole ratio rather than the mass of the reactants.

Thus, Reagents that are entirely consumed by a chemical reaction are known as limiting reagents.

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Answer:

If two atoms get close together then the electrons of each atom will get attracted to the other one and bc one atom lose electrons gets a positive charge and the one with more electrones will get a negetive charge

Explanation:

brailiest pls pls pls

The molar mass of the liquid X is obtained as 106 g/mol.

We know that the number of moles of the gas can be used to obtain the molar mass of the gas. Now we have the following about the gas that we need to mention here;

Pressure of the gas (P) = 1.02 × 10^5Pa or 1 atm

Number of moles of the gas (n) = ??

Volume of the gas (V)  = 23cm^3 or 0.023 L

Temperature of the gas (T) =  100°C or 373 K

Gas constant = 0.082 atmLK-1mol-1

Mass of the liquid = 0.08 g

We would now have to make use of the ideal gas equation here;

PV = nRT

n = PV/RT

n = 1 * 0.023/0.082 * 373

n = 0.023/30.6

n = 7.5 * 10^-4 moles

Given that;

Number of moles = mass/molar mass

Molar mass =  mass/Number of moles

Molar mass = 0.08 g/7.5 * 10^-4 moles

Molar mass = 106 g/mol

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In the electrical arrangement, the 6p subshell of the radon element contains 6 electrons.

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Answer:

A

Explanation:

If Hydrogen is H₂  There will be two silver

and is Carbon is C There will only be one gray

and if Oxygen is O₃ There will be three red

The correctly reported mass of water is 6.536 g.

To find the mass of water, we need to subtract the mass of the beaker from the mass of the beaker and water. Using the rules of significant figures for subtraction, we must report our answer with the same number of decimal places as the measurement with the fewest decimal places. In this case, the mass of the beaker only has four decimal places, so our answer must be reported with four decimal places as well. Therefore, the correctly reported mass of water is 6.536 g.

The rules of significant figures for subtraction dictate that the result of a subtraction calculation must be reported with the same number of decimal places as the measurement with the fewest decimal places. These rules are important in scientific measurements because they help ensure that the precision of the result matches the precision of the original data.

Reporting the mass of water in this problem with four decimal places is significant because it matches the precision of the measurement with the fewest decimal places, which is the mass of the beaker only. If we reported the mass of water with fewer decimal places, we would be rounding the result and losing some of its precision. If we reported it with more decimal places, we would be implying a level of precision that is not supported by the original data.

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Answer:

Jean Beguin

Explanation:

The first chemical equation was diagrammed by Jean Beguin in 1615.

The consequence of the reaction between  sulfuric acid and tetrazine is fire. Option D

The compound tetrazine is a basic compound that is composed of four atoms of hydrogen and two atoms of carbon. The formula of the compound is \(C_{2} H_{2}N_{4}\) . The compound is a six membered ring that could react with acids and become decomposed. In all cases of the decomposition of the tartazine the reaction is a violent one that leads to the evolution of flames.

In this case, we have been told that there is a reaction between   sulfuric acid and tetrazine. This is a very violent reaction that would result in the charring of the substrate.

Thus, when there is a chemical interaction between  sulfuric acid and tetrazine, the result is fire.

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0.361 moles of N₂ were required to produce 12.3 g of NH₃, using the balanced chemical equation N₂ + 3H₂ → 2NH₃.

The balanced chemical equation for the reaction is N₂ + 3H₂ → 2NH₃. We can use the balanced equation and the molar mass of NH₃ to calculate the number of moles of N₂ required to produce 12.3 g of NH₃,

1 mol NH₃ = 2 mol N₂ (from the balanced equation)

molar mass of NH₃ = 17.03 g/mol

moles of NH₃ = 12.3 g / 17.03 g/mol

moles of NH₃ = 0.722 mol

moles of N₂ = (0.722 mol NH₃) / 2

moles of N₂ = 0.361 mol

Therefore, 0.361 moles of N₂ were needed to produce 12.3 grams of NH₃.

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Complete question - For the reaction, N₂ + 3H₂ → 2NH₃. Given 12.3 grams of NH3, how many moles of N₂ were needed?​

Answer:

Option C. 251 kJ

Explanation:

The activation energy (Ea) of a given reaction is the minimum energy that must be overcomed for reactant to proceed to product.

The activation energy (Ea) can be obtained from an energy profile diagram by simply calculating the difference between the energy of the activation complex (i.e the peak) and the energy of the reactant.

Thus, we can obtain the activation energy for the reaction above as follow:

Activation complex = 332.6 kJ

Energy of reactant = 81.6 kJ

Activation energy =?

Activation energy = Activation complex – Energy of reactant

Activation energy = 332.6 – 81.6

Activation energy = 251 kJ

Therefore, the activation energy of the reaction is 251 kJ

Answer:

251 kJ

Explanation:

Answer: 41.0

Explanation: When you multiply the two numbers you get 41 but you need to have the same amount of significant numbers as the number in the problem with the least significant numbers. I hope this helps

Answer:

3, 5–dimethyl–4–heptanethiol.

Explanation:

To name the compound given in question above, we must:

1. Determine the longest continuous carbon chain. This gives the parent name of the compound.

2. Determine the functional group of the compound and give it the lowest possible count.

3. Identify the substituent group attached.

4. Give the substituent the lowest possible count.

5. Combine the above to obtain the name of the compound.

Now, let us name the compound given in question with the above ideas in mind. This can be achieved as shown below:

1. The longest continuous carbon chain is 7 i.e heptane.

2. The functional group is –SH i.e thiol. We shall add thiol to end end of heptane making the parent to be heptanethiol. The functional group is at carbon 4.

3. The substituent attached is CH3 i.e methly.

4. There are two CH3 attached to compound and they are at carbon 3 and 5 respectively.

5. The name of the compound is:

3, 5–dimethyl–4–heptanethiol.

Answer:

A,  crystal structures.

Explanation:

Answer:

A

Explanation:

The grams of magnesium hydroxide needed to yield 8.00 moles of magnesium chlorate is approximately 466.64 g. None of the options provided match the calculated value of 466.64 g.

To determine the grams of magnesium hydroxide (Mg(OH)2) needed to yield 8.00 moles of magnesium chlorate (Mg(ClO3)2), we need to consider the balanced chemical equation for the reaction between magnesium hydroxide and chlorine.

The balanced equation is as follows:

2 Mg(OH)2 + 6 Cl2 → 2 Mg(ClO3)2 + 2 H2O

From the balanced equation, we can see that 2 moles of Mg(OH)2 react with 6 moles of Cl2 to produce 2 moles of Mg(ClO3)2.

Therefore, the stoichiometric ratio is 2 moles of Mg(OH)2 : 2 moles of Mg(ClO3)2.

To calculate the grams of Mg(OH)2 needed, we can use the stoichiometric ratio and the given moles of Mg(ClO3)2.

Given:

Moles of Mg(ClO3)2 = 8.00 moles

Using the stoichiometric ratio, we have:

8.00 moles Mg(ClO3)2 × (2 moles Mg(OH)2 / 2 moles Mg(ClO3)2) = 8.00 moles Mg(OH)2

To convert moles to grams, we need to multiply by the molar mass of Mg(OH)2.

The molar mass of Mg(OH)2 = (24.31 g/mol) + (2 * 16.00 g/mol) = 58.33 g/mol

Grams of Mg(OH)2 = 8.00 moles Mg(OH)2 × 58.33 g/mol = 466.64 g

Therefore, the grams of magnesium hydroxide needed to yield 8.00 moles of magnesium chlorate is approximately 466.64 g.

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Since the number of the protons and the neutrons are the same, none of the images can be refer to structure C. Option D

A neutral atom is an atom that has an equal number of protons and electrons, resulting in a net charge of zero.

Protons are positively charged particles found in the nucleus of an atom, while electrons are negatively charged particles that orbit the nucleus. The number of protons in an atom determines its atomic number and the element it represents, while the number of electrons determines its overall charge.

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Answer:

A. The reaction shifts to the right (products) and the concentrations of I and H₂ decrease.

Explanation:

If gas is removed from the system at equilibrium, the system will try to compensate for the loss by shifting the reaction in a direction that produces more gas molecules. This is known as Le Chatelier's principle, which states that a system at equilibrium will respond to a disturbance by shifting in a way that minimizes the effect of the disturbance.

In this case, since gas is being removed from the system, the reaction will shift to the side that produces more gas molecules. Looking at the balanced equation, we can see that 2HI(g) has a greater number of gas molecules compared to H₂(g) and I₂(g). Therefore, the system will shift to the right (products) to produce more HI(g) and reestablish equilibrium.

Answer:

"They can be reversed by physical changes."

Explanation:

A chemical change can form a new substance, can be detected by the change in color and they have properties different from their starting materials.

Answer: CO2 and H2O

Explanation: I already took the test it's right

Answer:

Explanation:

The molar volume of a gas at STP (Standard Temperature and Pressure), which is equal to 22.4 liters.

There are 6.02x10^23 molecules in 1 mole of Argon.

So for 1.51x10^24 molecules of Argon, the volume at STP should be

(1.51x10^24 / (6.02x10^23)) * 22.4

= 56.19 liters

Moles of Argon:-

Now

\(\\ \rm\Rrightarrow 2.5(22.4)=56L\)

Answer:C I think

Explanation:

Hope this helps:)

The combined gas law equation is:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

The volume of the gas at 30 °C is approximately 760.67 mL.

To determine the volume of the gas at 30 °C, we can use the combined gas law equation, which relates the initial and final conditions of temperature and volume for a gas.

The combined gas law equation is:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

Where:

P1 and P2 are the initial and final pressures, respectively

V1 and V2 are the initial and final volumes, respectively

T1 and T2 are the initial and final temperatures in Kelvin, respectively

We need to convert the temperatures from Celsius to Kelvin by adding 273.15 to each value.

Given:

V1 = 550 mL

T1 = -55 °C = 218.15 K

T2 = 30 °C = 303.15 K

Assuming the pressure remains constant, we can rearrange the equation to solve for V2:

V2 = (P1 * V1 * T2) / (P2 * T1)

Since the pressure is not specified in the problem, we can assume it remains constant, allowing us to cancel out the pressure terms. Thus, the final equation becomes:

V2 = (V1 * T2) / T1

Plugging in the given values:

V2 = (550 mL * 303.15 K) / 218.15 K

Simplifying the calculation, we find:

V2 ≈ 760.67 mL

Therefore, the volume of the gas at 30 °C is approximately 760.67 mL.

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250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

In Earth, only one living organism is able to trap Solar energy or energy from sun with the help of a pigment known as Chlorophyll, and that organism is none other than Green plants.

Why Green plants? Because, Chlorophyll is a n coloured pigment which can trap the sunlight for photosynthesis which is the process of making glucose from raw materials in plants.

Rest options:

Rocks and water are non living organism and can't trap the solar energy. And, animal bodies don't have Chlorophyll pigment, they even obtain their food from plants directly or indirectly.

Hence, the Correct Option is:

\( \large{ \boxed{ \bf{ \red{Option \: B}}}}\)

And we are done !!

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Answer:

D) HBr

Explanation:

Given data:

Number of moles of Al = 8 mol

Number of moles of HBr = 8 mol

Limiting reactant = ?

Solution:

2Al + 6HBr      →      2AlBr₃ + 3H₂

now we will compare the moles of reactants with products.

                Al          :         AlBr₃

                   2         :            2

                    8         :          8

                 Al           :          H₂

                 2             :          3

                 8             :           3/2×8 = 12

                 HBr         :         AlBr₃

                   6           :              2

                    8           :            2/6×8 = 2.67

                 HBr         :            H₂

                   6            :            3

                   8             :           3/6×8 = 4

HBr produced less number of moles of product thus it will act as limiting reactant.

The limiting reactant is

D) HBr

Given:

Number of moles of Al = 8 mol

Number of moles of HBr = 8 mol

To find:

Limiting reactant = ?

The balanced chemical equation:

2Al + 6HBr → 2AlBr₃ + 3H₂

On comparing the moles of reactants and products:

Al : AlBr₃

2 : 2

Al : H₂

2  :  3

HBr : AlBr₃

6 : 2

HBr : H₂

6 : 3

HBr produces less number of moles of product thus it will act as limiting reactant.

Thus, the correct option is D.

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The amount in, formula unit. of 33.4 g sodium hydroxide is 5.03 x \(10^{23\) . Option C.

In order to calculate the mass of NaOH from formula units, first, we need to know the molar mass of NaOH, which is 40 g/mol1.

The formula units are related to moles by Avogadro’s number which is 6.022 x 10^23 formula units per mole.

Therefore, we can calculate the mass of NaOH as follows:

33.4 g NaOH = (33.4 g NaOH / 40) x (6.022 x 10^23) = 5.03 x \(10^{23\) formula units.

In other words, there are 5.03 x \(10^{23\) formula units in 33.4 g sodium hydroxide.

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