could someone help me!

Consider a cup made of plastic. What are the pros of using plastic?

Atoms of hydrogen are then balanced. Watch the following video to learn more about oxygen atoms. C12H22O11 with 12O2 equals 12CO2 plus 11H2O.

Balance C12H22O11 + O2 CO2 + H2O

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Answer:

i think its b but im not sure so im sorry if im wrong

Explanation:

Answer:

The heat required to boil water is called the heat of vaporization, and it is the amount of energy required to change the state of a substance from a liquid to a gas at a constant temperature. The heat of vaporization for water is approximately 40.7 kJ/mol or 2257 J/gram.

To calculate the heat required to boil 50.0 grams of water, you would multiply the heat of vaporization (2257 J/g) by the number of grams of water:

Heat (J) = 2257 J/g x 50 g

Heat (J) = 112,850 J

To convert Joules to kilojoules (kJ), divide by 1000.

Heat (kJ) = 112,850 J / 1000 = 112.85 kJ

Therefore, it takes 112.85 kJ of heat to boil 50.0 grams of water.

The percent by mass of acetic acid in the vinegar is 2.33%.

Below are the steps to solve the given problem using the data table given below:

Step 1: Calculate the mass of the vinegar. Given,Mass of flask and vinegar solution- 25.17gMass of flask- 15.12gMass of vinegar solution = Mass of flask and vinegar solution - Mass of flask= 25.17 g - 15.12 g= 10.05 g

Step 2: Calculate the moles of NaOH used in the titration.Molarity of NaOH solution is 0.1 M.Moles of NaOH = Molarity × Volume of NaOH usedMoles of NaOH = 0.1 M × 39.00 mL (since the initial volume of NaOH is 0.00 mL)Moles of NaOH = 0.0039 moles

Step 3: Determine the moles of acetic acid used in the reaction.The balanced chemical equation for the reaction between NaOH and acetic acid (the main component of vinegar) is given below:CH3COOH + NaOH → CH3COONa + H2OMoles of NaOH = Moles of CH3COOH (since they react in a 1:1 ratio)Moles of CH3COOH = 0.0039 moles

Step 4: Calculate the mass of acetic acid used in the reaction.Molar mass of acetic acid is 60.05 g/mol.Mass of CH3COOH = Moles of CH3COOH × Molar mass of CH3COOH= 0.0039 moles × 60.05 g/mol= 0.234 gStep 5: Calculate the percent by mass of acetic acid in the vinegar.Percent by mass of acetic acid = (Mass of CH3COOH / Mass of vinegar solution) × 100%= (0.234 g / 10.05 g) × 100%= 2.33%.

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Answer:

c

Explanation:

A / B / D are chemical changes

while C is physical change

which is easier to be reversed

as

in dissolving Zn in HCl

H2 gas evolve

glucose fermentation

CO2 gas evolve

Iron rusting produce Fe(OH)3

all produces new substances

thats why the considered to be chemical changes

valence electrons

which is an outer shell electron

Answer:

1. an educated guess

2. data

3. what changes in experiment

4. what stays the same in both groups

5. the group where nothing changes, normal

6. group with independent variable, what's being tested

Redox reactions involve the transfer of one or more electrons from one molecule to another. When an atom or molecule loses electrons, the process is called oxidation and when an atom or molecule gains electrons, the process is called reduction.

The Law of Thermodynamics states that energy is always produced during energy conversions. The First Law of Thermodynamics, also known as the Law of Conservation of Energy, states that energy cannot be created or destroyed, only transformed from one form to another. Therefore, in any energy conversion, the total amount of energy before and after the conversion remains the same.

The citric acid cycle takes place in the matrix of the mitochondrion. This cycle, also known as the Krebs cycle, is a series of chemical reactions that occur in the mitochondria and produce energy in the form of ATP.

Recent findings indicate that beet juice contains inorganic nitrate, which may improve athletic performance during exercise. Inorganic nitrate can be converted into nitric oxide in the body, which can improve blood flow and oxygen delivery to muscles, potentially enhancing exercise performance.

Chlorophyll absorbs energy and begins the process of photosynthesis. Chlorophyll is a green pigment found in the chloroplasts of plants and algae. It absorbs light energy from the sun and uses it to convert carbon dioxide and water into glucose and oxygen in the process of photosynthesis.

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Because it provides a very high concentration compared to what is possible with saline.

A high chloride ion concentration shifts the equilibrium position to the right due to Le Chatelier's principle.

Uses of HCL -

Hydrogen chloride is produced when many plastics are burned. Acute (short-term) inhalation exposure in humans can cause eye, nose, and respiratory tract irritation and inflammation, and pulmonary edema.

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Q < Ksp, no precipitate will form when 10.0 mL of 0.0100 M NaF is mixed with 10.0 mL of 0.0100 M Ba(NO₃)₂.

To determine if a precipitate will form, we need to compare the ion product (Q) to the solubility product (Ksp). The balanced equation for the reaction is:

Ba(NO₃)₂ + 2 NaF → BaF₂ + 2 NaNO₃

The initial concentration of Ba(NO₃)₂ is 0.0100 M x (10.0 mL / 20.0 mL) = 0.00500 M
The initial concentration of NaF is 0.0100 M x (10.0 mL / 20.0 mL) = 0.00500 M

The reaction will go to completion because both reactants are soluble ionic compounds, so all the Ba²⁺ and F⁻ ions will react to form BaF₂, leaving behind Na⁺ and NO³⁻ ions in the solution.

The concentration of Ba²⁺ ions is 0.00500 M and the concentration of F- ions is 2 x 0.00500 M = 0.0100 M (due to the stoichiometry of the balanced equation).

The ion product (Q) is [Ba²⁺][F⁻]^2 = (0.00500 M)(0.0100 M)^2 = 5.00 x 10^-7

Since Q is smaller than the Ksp (2.4 x 10^-5), no precipitate will form. The solution will remain clear.

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A synthesis reaction is one in which a product is made from two  or mote reactants.

The term reaction mechanism refers to the sequence of steps that has to be involved as a reactant is converted to products.

The process of converting ethyne to carboxyllic acid passes through a six step process which includes the oxidation of the substrate using permanganate in basic solution.

The detailed mechanism for the synthesis of a carboxylic acid from ethyne  is shown in the image attached to this answer.

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In a new compound, it is found that the central carbon atom is sp2 hybridized, this implies that carbon is also involved in a pi bond.

Hybridization of Carbon-Carbon is one of the important and most common chemical elements that are essential for organic connections.

A carbon atom is sp2 hybridized when bonding takes place between 1 s- orbital with two p orbitals. There is a formation of two single bonds and one double bond between three atoms. The hybrid orbitals are placed in a triangular arrangement with 120° angles between bonds.

In sp2 hybridization, one s orbital and two p orbitals hybridize to form three sp2 orbitals, each consisting of 33% s character and 67% p character.

Therefore when the central carbon atom is sp2 hybridization then there must be carbon involves in a pi bond.

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Answer:

Explanation

hope this helps!

1) The dream of Mendeleev concerned the arrangement of the elements by mass

2) Periodicity is the changing properties of the elements

3)

Antoine Lavoisier - Arranged the elements by their properties

Johann Döbereiner - Arranged the elements into triads

John Newlands - Arranges the elements according to the order of increasing atomic mass

We define the periodic table as the arrangement of the elements in order of increasing atomic numbers. We know can see that several attempts have been made at the systematization of the elements and the approaches to the problem have taken different dimensions. In a dream, Mendeleev saw the elements line up in order of atomic masses and there was a visible pattern.

The term periodicity has to do with the regular repeating property of the elements and this can be seen when we follow the properties of the elements as they change down the group and across the period.

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Answer:

LOL ked e e. E e s e

Explanation:

This is my account

Answer:C: sulfur

Explanation:

The molarity of the phosphorous acid solution is approximately 0.00760 M.To determine the molarity of the phosphorous acid solution, we need to use the balanced chemical equation and the stoichiometry of the reaction between ammonia and phosphorous acid.

The balanced chemical equation for the reaction between ammonia (NH3) and phosphorous acid (H3PO3) is:

3NH3 + H3PO3 -> (NH4)3PO3

From the equation, we can see that the ratio of ammonia to phosphorous acid is 3:1.

Given that 11.91 ml of 0.162 M ammonia solution reacts, we can calculate the number of moles of ammonia used:

Moles of ammonia = volume (in L) x molarity

Moles of ammonia = 0.01191 L x 0.162 mol/L = 0.001930 mol

Since the ratio of ammonia to phosphorous acid is 3:1, we know that the number of moles of phosphorous acid used is one-third of the moles of ammonia:

Moles of phosphorous acid = 1/3 x moles of ammonia

Moles of phosphorous acid = 1/3 x 0.001930 mol = 0.000643 mol

Next, we calculate the molarity of the phosphorous acid solution:

Molarity = moles of solute / volume of solution (in L)

Molarity = 0.000643 mol / 0.08459 L = 0.00760 M

Therefore, the molarity of the phosphorous acid solution is approximately 0.00760 M.

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Answer: yes but usally to Doujinshi

Explanation:cause it’s better then Real stuff I guess

Answer:

boy noooooo

Explanation:

1. Calculate the concentration of HCl added: moles of HCl / volume of solution (in L). 2. Calculate the new concentration of H+ ions in each solution after adding HCl.. 3. Use the pH formula: pH = -log10[H+]

To calculate the pH after 0.048 mol HCl is added to 1.00 L of each of the following four solutions, we need to use the formula pH = -log[H+].

Solution 1: 0.10 M NaOH
Before adding HCl, this solution is a strong base with a pH of 13. Therefore, [H+] = 10^-13 M. When 0.048 mol of HCl is added, it reacts with all of the OH- ions to form H2O and Cl- ions. The new concentration of H+ ions is equal to the concentration of the NaOH before the HCl was added, which is 0.10 M. Therefore, the pH after adding HCl is:

pH = -log(0.10)
pH = 1.00

Solution 2: 0.20 M NH3
Before adding HCl, this solution is a weak base with a pH of 11.31. Therefore, we need to use the equilibrium expression for the reaction between NH3 and H2O to calculate the new concentration of H+ ions after adding HCl. The equilibrium constant for this reaction is Kb = 1.8 x 10^-5.

NH3 + H2O ⇌ NH4+ + OH-

At equilibrium, [NH4+] [OH-] / [NH3] = Kb
We know that [OH-] = 10^-pOH = 10^-2.69 = 0.001
Substituting into the equation gives:

[NH4+] (0.001) / (0.20 - [NH4+]) = 1.8 x 10^-5

Solving for [NH4+] gives:

[NH4+] = 4.9 x 10^-4 M

Therefore, [H+] = Kw / [OH-] = 1 x 10^-14 / 0.001 = 1 x 10^-11 M. When 0.048 mol of HCl is added, it reacts with all of the NH3 to form NH4+ and Cl- ions. The new concentration of H+ ions is equal to the concentration of NH4+ after the HCl was added, which is 4.9 x 10^-4 M. Therefore, the pH after adding HCl is:

pH = -log(4.9 x 10^-4)
pH = 3.31

Solution 3: 0.10 M HCl
Before adding HCl, this solution is a strong acid with a pH of 1. Therefore, [H+] = 10^-1 M. When 0.048 mol of HCl is added, the total concentration of H+ ions is doubled to 0.096 M. Therefore, the pH after adding HCl is:

pH = -log(0.096)
pH = 1.02

Solution 4: 0.10 M NH4Cl
Before adding HCl, this solution is an acidic salt with a pH of 5.39. Therefore, we need to use the equilibrium expression for the reaction between NH4+ and H2O to calculate the new concentration of H+ ions after adding HCl. The equilibrium constant for this reaction is Ka = 5.6 x 10^-10.

NH4+ + H2O ⇌ NH3 + H3O+

At equilibrium, [NH3] [H3O+] / [NH4+] = Ka
We know that [NH3] = [HCl] = 0.10 M
Substituting into the equation gives:

[H3O+]^2 / (0.10 - [H3O+]) = 5.6 x 10^-10

Solving for [H3O+] gives:

[H3O+] = 7.5 x 10^-6 M

Therefore, the pH before adding HCl is:

pH = -log(7.5 x 10^-6)
pH = 5.12

When 0.048 mol of HCl is added, it reacts with all of the NH4+ ions to form H2O and Cl- ions. The new concentration of H+ ions is equal to the concentration of H3O+ before the HCl was added, which is 7.5 x 10^-6 M. Therefore, the pH after adding HCl is:

pH = -log(7.5 x 10^-6)
pH = 5.12

Note that the pH did not change significantly because the original solution was already acidic due to the presence of NH4Cl.

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Answer:

2

Explanation:

in terms of cells, it exists from previous existing cells, that means scientist are built up by the work of other scientist

Answer:

the answer is B

Explanation:

Answer: 200

Explanation:

The answer is 200 kPa

Answer:

physical: color, appearance chemical: reactivity, flammability

Answer:$$7.50 x 10^23$$

$$H_2SO_4$$?

Explanation:It is a fact that such a quantity has a mass of  

98.08

⋅

g

. Why? Because  

6.022

×

10

23

particles SPECIFIES a molar quantity. And we know (or can calculate) that sulfuric acid has a molar mass of  

98.08

⋅

g

...  

When one reaction or system drives another with the energy it produces, this is known as energy coupling. Chemiosmosis is the diffusion of ions across a membrane that is semi-permeable.

Chemiosmosis is the passage of ions down their electrochemical gradient over a structure bound to a semipermeable membrane. The production of adenosine triphosphate (ATP) by the passage of hydrogen ions (H+) across a membrane during photosynthesis or cellular respiration is a significant illustration.

When ions move through a channel, an ion gradient with potential energy can be employed to drive chemical reactions (red).

A gradient of protons' electrochemical concentrations across a membrane can be used to produce ATP. Hydrogen ions, or protons, will diffuse from a location of high proton concentration to a region of low proton concentration. The term "chemiosmosis" refers to a process that is similar to osmosis and involves the passage of water across a selective membrane.

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Using this formula, we can calculate the confidence interval once we have the sample data, without the sample data, it is not possible to provide an accurate confidence interval estimate.

To construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system, we would need the sample data, specifically the number of cell phone users and the number of users who developed cancer. Without the sample data, it is not possible to provide an accurate confidence interval estimate.

However, if we assume that we have the necessary sample data, we can proceed with the calculation. The formula for calculating a confidence interval for a proportion is:

Confidence interval

\(=�^±�×�^(1−�^)�Confidence interval= p^​ ±z× np^​ (1− p^​ )​ ​ where:�^p^​\)

 is the sample proportion (number of users with cancer divided by the total number of cell phone users).

\(�\)

z is the z-score corresponding to the desired confidence level (90% confidence level corresponds to a z-score of approximately 1.645).

\(�\)

n is the sample size (total number of cell phone users).

Using this formula, we can calculate the confidence interval once we have the sample data.

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The rate constant increases by a factor of 1.02 when the temperature is increased from 550.0 degrees C to 60.0 degrees C.

To determine how the rate constant changes with temperature, we can use the Arrhenius equation as follows;

k₁/k₂ = (A e(-Ea/RT₁)) / (A e(-Ea/RT₂))

where;

k₁/k₂ = e (Ea/R) x (1/T₂ - 1/T₁)

k₁/k₂ = e (83.1 / 8.314) x (1/333 - 1/823)

k₁/k₂ = e (0.01780

k₁/k₂ = 1.02

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