the process that breaks down rocks

Answer:

a syringe is a pump consisting of a sliding plunger that fits tightly in a tube.

Explanation:

a syringe is a pump consisting of a sliding plunger that fits tightly in a tube. the plunger can be pulled and pushed inside the precise cylinderell to, or burial, letting the syringe draw in or expel a liquid or gas through an office at the open end of the two.

Answer:

The plunger can be pulled and pushed inside the precise cylindrical tube, or barrel, letting the syringe draw in or expel a liquid or gas through an orifice at the open end of the tube.

Explanation:

The standard reaction enthalpy for the given reaction is +235.8 kJ/mol.

The standard reaction enthalpy (ΔH°) for the given reaction is determined as follows:

Equation of reaction: 3 Fe₂O₃ (s) → 2 Fe₃O₄ (s) + ½ O₂ (g)

The standard enthalpy of formation values for Fe₂O₃ (s), Fe₃O₄(s), and O₂(g) is used to calculate the standard reaction enthalpy.

ΔH° = [2 × ΔH°f(Fe₂O₃)] + [½ × ΔH°f(O₂)] - [3 × ΔH°f(Fe₃O₄)]

where;

ΔH°f(Fe₂O₃) = -824.2 kJ/mol

ΔH°f(Fe₃O₄) = -1118.4 kJ/mol

ΔH°f(O₂) = 0 kJ/mol

ΔH° = [2 × (-1118.4 kJ/mol)] + [½ × 0 kJ/mol] - [3 × (-824.2 kJ/mol)]

ΔH° = -2236.8 kJ/mol + 0 kJ/mol + 2472.6 kJ/mol

ΔH° = 235.8 kJ/mol

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Hydroelectric power is one of the oldest and most widely used renewable sources of energy.

Globally we see that hydropower is by far the largest modern renewable source. Every country's top priority is to generate hydroelectric power so they have to rely less on nuclear and coal power plants.

Hydroelectric power is generated by using the elevation difference,  created by a dam or diversion-like structure of water flowing in on one side and out, far below, on the other side.

If we talk about some countries, Hydropower currently generates 31.5% of total U.S. renewable electricity generation.

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Answer:

Pb3O4 + 4H2 → 3Pb + 4H2O

Explanation:

Pb3O4

Tritium - H2

Molar Mass of H2 Bond Polarity H-3 Hydrogen-3 3H T

Products

Lead - Pb

Molar Mass of Pb Plumbum Element 82 Bulk Lead

Water - H2O

Molar Mass of H2O Oxidation Numbers of H2O Dihydrogen Monoxide Dihydridooxygen Hoh Hydrogen Hydroxide Dihydrogen Oxide Oxidane Hydrogen Oxide Pure Water

Answer:

2

Explanation:

Answer:

a

Explanation:

i just took it

Answer:

This is true

Explanation:

Answer:

I think it is b

Explanation:

To determine the ratio of ratios for the two compounds, we need to compare the percentages of sulfur and oxygen in each compound. The ratio of ratios for the two compounds is 1.25/8.93.

Compound 1:

Sulfur (S) = 50.0%

Oxygen (O) = 50.0%

Compound 2:

Sulfur (S) = 40.0%

Oxygen (O) = 5.600% Now, let's calculate the ratio of ratios: Ratio of sulfur (S): Compound 1: Compound 2 = 50.0% / 40.0% = 1.25

Ratio of oxygen (O): Compound 1: Compound 2 = 50.0% / 5.600% = 8.93. Therefore, the ratio of ratios for the two compounds is 1.25/8.93. Compounds are substances composed of two or more elements chemically bonded together. In a compound, the constituent elements are present in fixed proportions and are held together by chemical bonds.

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A. In this pair, H3O+ is the stronger acid because it can donate a proton more easily than HCN.
B. H2SO4 is the stronger acid in this pair because it is a strong acid, while HCN is a weak acid.
C. HS? is the stronger acid in this pair because it has a greater positive charge on the sulfur atom, making it more acidic than H2S.

The stronger acid in each pair.

A. Between HCN and H3O+, the stronger acid is H3O+. H3O+ is a stronger acid due to its higher ability to donate a proton.

B. Between H2SO4 and HCN, the stronger acid is H2SO4. H2SO4 is a stronger acid because it has a higher degree of ionization and can donate more protons than HCN.

C. Between HS- and H2S, the stronger acid is H2S. H2S is a stronger acid because it more readily donates a proton compared to HS-.

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Electronegativity tends to increase across a period. This is because as you move from left to right across a period, the number of protons in the nucleus increases, while the number of electrons stays the same.  Hence option C is correct.

This means that the effective nuclear charge, which is the net positive charge experienced by the valence electrons, increases. The increase in effective nuclear charge makes it more difficult for the valence electrons to be pulled away from the nucleus, which increases the electronegativity.

Electronegativity tends to decrease down a group. This is because as you move down a group, the number of electrons in the valence shell increases. This increases the shielding effect, which is the effect of the inner electrons in reducing the attractive force of the nucleus on the valence electrons.

The decrease in the attractive force of the nucleus makes it easier for the valence electrons to be pulled away, which decreases the electronegativity.

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Answer: 4. We know that one mole of any chemical compound always contains 6.022 x 10^23 molecules. Therefore, we can calculate the number of molecules of 2.25 moles of sulfur dioxide SO2 by multiplying the number of moles by the Avogadro's constant 6.022 x 10^23:    

    2.25 moles SO2 (6.022x10^23 molecules/1mole) = 1.355 x 10^24 molecules of sulfur dioxide

5. The number of moles of sodium chloride are 0.40 moles

Explanation:

The element group VI A, also known as the chalcogen group, consists of the elements oxygen, sulfur, selenium, tellurium, and polonium. These elements are characterized by having six valence electrons, which is why they are placed in group VI A of the periodic table.

The period number refers to the row of elements on the periodic table. Elements in period 3 include sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, and argon.

It is not possible to determine the number of protons in the nucleus of an element based on its group and period alone. The number of protons in the nucleus of an element is equal to its atomic number, which is a unique property of each element.

Oxygen, which is the first element in group VI A, has an atomic number of 8, which means it has 8 protons in its nucleus. Sulfur, which is the second element in group VI A, has an atomic number of 16, which means it has 16 protons in its nucleus. Selenium, which is the third element in group VI A, has an atomic number of 34, which means it has 34 protons in its nucleus. Tellurium, which is the fourth element in group VI A, has an atomic number of 52, which means it has 52 protons in its nucleus. Polonium, which is the fifth element in group VI A, has an atomic number of 84, which means it has 84 protons in its nucleus.

Elements in period 3 with atomic numbers 11, 12, 13, 14, 15, 16, 17, and 18 are sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, and argon, respectively. These elements have 11, 12, 13, 14, 15, 16, 17, and 18 protons in their nuclei, respectively.

According to a first-order rate law with a rate constant of 0.0058 min1, the reaction requires a concentration of iodide of about 4.83 mM before the color changes after 12 minutes.

The demonstration in the movie shows that larger iodide ion concentrations accelerate the first reaction, hastening the depletion of thiosulfate. Because of this, the reaction's end-signaling color shift happens faster.

rate = k[I-]

[I-] = rate / k

Plugging in the given rate (0.028 mM/12 min), we get:

[I-] = (0.028 mM/12 min) / k

[I-] = (0.028 mM/12 min) / (0.0058 min⁻¹)

[I-] ≈ 4.83 mM

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If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

What is pressure?

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Various units are used to express pressure. Some of these are units of force divided by units of area. For example, the SI unit of pressure, Pascal (Pa), is 1 Newton per square meter (N/m2). Similarly, pounds force per square inch (psi, symbol lbf/in2) is the traditional unit of pressure in imperial and US systems. Pressure can also be expressed as standard atmospheric pressure. Atmospheric pressure (atm) is equal to this pressure and torr is defined as 1/760 of this. Manometric units such as centimeters of water, millimeters of mercury, and inches of mercury are used to express pressure as the height of a particular liquid column within a manometer.

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

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Answer:

Oh thats great..

But I hate juice :(

The coefficient in the reaction has been 1 for \(\rm C_6H_1_2O_6\), 6 for \(\rm O_2\), 6 for \(\rm CO_2\), and 6 for \(\rm H_2O\). Thus, the correct option is A.

The balanced chemical equation has been given to follow the law of conservation of mass. The given reaction has been the combustion of sugar.

The reaction has been given as:

\(\rm C_6H_1_2O_6\;+\;O_2\;\rightarrow\;CO_2\;+\;H_2O\)

The balanced chemical equation has been the reaction in which the number of atoms of each reactants on the product side are equal. The balanced chemical equation for sugar combustion has been:

\(\rm C_6H_1_2O_6\;+\;6\;O_2\;\rightarrow\;6\;CO_2\;+\;6\;H_2O\)

The coefficient in the reaction has been 1 for \(\rm C_6H_1_2O_6\), 6 for \(\rm O_2\), 6 for \(\rm CO_2\), and 6 for \(\rm H_2O\). Thus, the correct option is A.

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The percent abundance of the isotope with an atomic mass of 120.905 is approximately XX%.

To calculate the percent abundance, we need to compare the relative abundance of the two isotopes. Given that there are two isotopes with atomic masses of 120.905 and 122.921, we can assume that the sum of their percent abundances is 100%.

Let's denote the percent abundance of the isotope with an atomic mass of 120.905 as "x". The percent abundance of the other isotope (with atomic mass 122.921) can then be expressed as (100 - x).

Since the atomic mass is directly proportional to the percent abundance, we can set up the following equation:

(120.905 * x) + (122.921 * (100 - x)) = 121.764

Solving this equation will give us the value of x, which represents the percent abundance of the isotope with an atomic mass of 120.905. Once we find this value, we can express it as a percentage to determine the answer.

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A polymer called polystyrene (PS) is created from the liquid hydrocarbon styrene, which is produced commercially from petroleum.

The monomers of the aromatic hydrocarbon styrene are converted into a synthetic polymer known as polystyrene. Polystyrene can be either foamed or solid. For normal use, polystyrene is clear, hard, and brittle. It is a fairly priced resin when measured by weight. It has a weak barrier to oxygen and water vapor and a relatively low melting point. Polystyrene is commonly used to preserve consumer items in both solid and foam forms. In order to protect food from damage or spoiling, polystyrene is frequently used to produce CD and DVD covers, foam shipping peanuts, food packaging, meat/poultry trays, and egg cartons.

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The dosage of 26mg can be prepared using approximately 1.625 mL of the 40mg in 2.5 mL solution.

The dosage of 22mg can be prepared using approximately 1.222 mL of the 36mg per 2 mL strength solution.

To calculate the dosage using ratio and proportion, we can set up a proportion based on the strength of the solution.

40mg in 2.5 mL solution will be used to prepare a 26mg dosage.

Let X represent the mL of the solution needed to prepare the 26mg dosage.

We can set up the proportion as follows:

40mg/2.5mL = 26mg/X mL

Cross-multiplying and solving for X, we have:

40mg * X mL = 2.5mL * 26mg

40X = 65

X = 65/40

X ≈ 1.625 mL

For the second question:

36mg per 2 mL strength solution is used to prepare 22mg.

Let Y represent the mL of the solution needed to prepare the 22mg dosage.

We can set up the proportion as follows:

36mg/2mL = 22mg/Y mL

Cross-multiplying and solving for Y, we have:

36mg * Y mL = 2mL * 22mg

36Y = 44

Y = 44/36

Y ≈ 1.222 mL

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Answer:

Explanation:

All compounds are molecules, but not all molecules are compounds. That is because a molecule can be made up of two atoms of the same kind, as when two oxygen atoms bind together to make an oxygen molecule. However, all compounds are made up of two or more different types of atoms.

Answer:

the last one

Explanation:

The correct option is D as when sterilizing laboratory equipment with ethanol and a flame, neither option A nor option C should be done.

To reduce the chance of accident or fire when sterilizing lab equipment using ethanol and flame, it is important to follow the correct safety procedures. It is important to keep the alcohol completely away from the flame, not just as far away as possible. When exposed to an open flame, even small amounts of vapor from ethanol can catch fire.

It is also unwise to point the tip of the sterilizing tool upwards as given in option C. Any leftover ethanol may collect at the tip of the tool if it is held with the tip up, which increases the chance of flaring or igniting when it comes in contact with the alcohol.

Therefore, the correct option is D.

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Explanation:

in this question, we're asked how to determine whether we have a metallic or nonmetallic substance.So what you want to do is one to remember that metals are malleable and Nonmetal are brittle. So if we were to hammer the metal, it would be very malleable, but the nonmetal would fall apart. And never we could just hammer the sample and see whether it was malleable. And therefore it would be a medal or a brittle and therefore being nonmetal. 

The molarity of the iodine in the solution prepared by dissolving 5.15 g of iodine to make a 225 mL solution is 0.178 M

First, we shall obtain the mole in 5.15 g of iodine

Mole = mass / molar mass

Mole of iodine = 5.15 / 126.9

Mole of iodine = 0.04 mole

Now, we shall determine the molarity of the iodine in the solution. Details below:

Molarity of solution = mole / volume

Molarity of iodine = 0.04 / 0.225

Molarity of iodine = 0.178 M

Thus, we can conclude that the molarity of the iodine in the solution is 0.178 M

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Answer: The specific heat is the amount of heat per unit mass that is essential for raising the temperature of heat by one degree Celsius. Equation is the symbolic reaction of a chemical reaction in the form of symbols and formulas, where the reactant is written on the left side and the product is written on the right side.

We encounter a lot of things in our daily life that we love and also hate. What I have faced a lot is my nail tags that happens to me a lot and hurts too. And I love dipping biscuits in tea and that never happens at once because a single biscuit is too big for the cup. Hence, I have to break it and dip. Ugh

As your body needs more oxygen during exercising and produces more carbon dioxide, this might result in a high respiratory rate.

During exercise, your breathing may occur 3–4 times more frequently. Hyperpnea, or rapid, deep breathing, is the body's natural response to increased carbon dioxide generation. The pace of breathing increases along with the blood's concentration of carbon dioxide. The pH of the blood changes dramatically as carbon dioxide levels rise. The chemoreceptors in the medulla oblongata, a part of the hindbrain that controls respiration, detect this shift. To expel the additional carbon dioxide and breathe in more oxygen, the respiratory center speeds up breathing.

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Answer:

b. \(\% diss =4.4x10^{-2}\%\)

Explanation:

Hello there!

In this case, given the ionization reaction of HClO as weak acid:

\(HClO\rightleftharpoons H^++ClO^-\)

We can write the equilibrium expression as shown below:

\(Ka=3.5x10^{-8}=\frac{[H^+][ClO^-]}{[HClO]}\)

In such a way, via the definition of x as the reaction extent, we can write:

\(3.5x10^{-8}=\frac{x^2}{[HClO]}\)

As long as Ka<<<<1 so that the x on the bottom can be neglected. Thus, we solve for x as shown below:

\(x=\sqrt{3.5x10^{-8}*0.18} =\\\\x=7.94x10^{-5}M\)

And finally the percent dissociation:

\(\% diss=\frac{x}{[HClO]} *100\%\\\\\% diss=\frac{7.94x10^{-5}M}{0.18}*100\% \\\\\% diss =0.044\%=4.4x10^{-2}\%\)

Which is choice b.

Best regards!

The pH of the solution after mixing2 tablets of Aspirin into 300mL of water is found to be 2.5.

This type of acid/base reaction can be represented by the following straightforward equation, where HA = ASA.

A- + H3O+ from HA + H2O

Now that we know the starting HA concentration, we can calculate it. We have 5 tablets and each tablet contains 325 milligrammes of ASA, so:

5 tablets at 325 mg ASA each equals 1625 mg ASA.

By calculating the number of moles of ASA present and dividing it by the entire volume of the solution, which is 237 mL, we can turn this into the starting concentration.

9.02 moles of ASA at 1625 mg/180.157 g/mol.

9.02 moles divided by 300 mL equals 0.0381 mol/L or 0.0381 moles/mL.

With the initial concentration, we can now keep track of concentration variations and calculate the equilibrium concentrations.

The Ka value, which represents ASA's acid dissociation constant, was provided to us. The following is the formula we use to calculate this value:

Ka is equal to [A-][H3O+]/[HA] = 3.3 x 10-4.

3.3 x 10⁻⁴ is equal to Ka = [x][x]/[0.0381-x].

Since a number of 10⁻⁴ is so little, we may overlook the initial concentration change for the time being. Thus, our new, simpler equation is:

x = 0.0035 = [A-] = [H3O+] and x = 0.0038 = 3.3 x 10⁻⁴ and 1.3 x 10⁻⁵ respectively.

The concentration of hydronium ions, which is necessary to determine a solution's pH, has now been solved for. We calculate pH using the equation pH = -log[H3O+]:

pH = -log[0.0035]

pH = 2.5

So, the pH value is 2.5.

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Answer:

2.627775588 degrees Celsius (with 2 sig figs)

Explanation:

We need to use our equation q=m×s×(change in temp) and solve for our change in temperature. So divide both sides by m×s and you'll get:

Change in temp=q/(m×s) Where q= J of heat m=mass and s= specific heat

So now we just plug our numbers in:

56J/(23.6g×0.903J/g°C)= 2.627775588 and since 56 only has 2 sig figs, we round the final answer to 2.6°C