What is the final temperature of the water went 100 mL of 30°C water is mixed with 500 mL of 60°C water

Theories, including atomic theory, are not set in stone and are subject to change as new evidence emerges. Scientists are continuously active in testing and refining these theories to ensure that they remain accurate and relevant.

Instruction Active: In science, hypotheses, laws, and theories are used to explain different phenomena. Hypotheses are tentative explanations for observations and are tested through experimentation. Laws are well-established theories that describe a natural phenomenon and can be mathematically expressed. Theories, on the other hand, are explanations that are supported by scientific evidence and can be used to make predictions. They are more complex than laws and are subject to modification as new evidence emerges.
When it comes to atomic theory, there are several reasons why scientists may reject it. For instance, new evidence may emerge that contradicts the theory's predictions. Additionally, new observations or experiments may reveal that some of the fundamental assumptions of the theory are incorrect. Sometimes, a competing theory may be proposed that better explains the observed phenomena. Furthermore, if a theory lacks empirical support, it may be rejected.

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Answer:

Explanation:

Hope that helps if not lmk have a wonderful day!

Answer:

A Homogeneous mixture is one that consists of a single type of element, for example - Oxygen, as it consists two oxygen atoms to make one oxygen molecule. Hope my answer helps :)

Answer:

iron ions with a 2+ charge

The reaction is acid-catalyzed

Step 1 is common to both E1 and E2 reactions of alcohols

Step 2 is the rate-determining step.

The mechanistic steps describe the E1 reaction of an alcohol

Alcohols can dehydrate through either E1 or E2 processes. The elimination response for primary alcohols follows the E2 mechanism, whereas the E1 mechanism is used for secondary and tertiary alcohols.

Alcohol elimination reactions can occur when an acid, such as phosphoric acid, reacts with alcohols because they have a carbon attached to an OH group. While secondary and tertiary alcohols go through E1 reactions, primary alcohols go through E2 reactions.

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Option D - [OH⁻] < 2.3 x 10⁻⁷M < [H3O⁺]. At 50°C the value of Kw is 5.5 x 10-14. An acidic solution at 50°C has [OH⁻] < 2.3 x 10⁻⁷M < [H3O⁺].

At 50°C, Kw (the ion product constant for water) is 5.5 x 10⁻¹⁴. This means that [H3O⁺][OH⁻] = 5.5 x 10⁻¹⁴.

In an acidic solution, [H3O⁺] is greater than [OH⁻]. So, we know that [H3O⁺] > [OH⁻] in this scenario.

Using the Kw expression, we can rearrange to solve for [OH⁻].

[H3O⁺][OH⁻] = 5.5 x 10⁻¹⁴

[OH⁻] = 5.5 x 10⁻¹⁴ / [H3O⁺]

Since [H3O⁺] is greater than [OH⁻], we can substitute in the smallest possible value for [H3O⁺], which is 2.3 x 10⁻⁷M (given in the answer choices).

[OH-] = 5.5 x 10⁻¹⁴ / 2.3 x 10⁻⁷M

[OH-] = 2.39 x 10⁻⁸M

Therefore, the answer is D) [OH⁻] < 2.3 x 10⁻⁷M < [H3O⁺].

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Answer:

10.3

Explanation:

Answer:

4is the answer

Explanation:

Out of the given options, none of the following have the empirical formula CHO.

The empirical formula is the simplest formula for a compound that reflects the ratio of elements present in the compound. It gives the ratio of atoms of different elements in the compound. The empirical formula can be different from the molecular formula.

Lipids are the biomolecules that are composed of carbon, hydrogen, and oxygen (CHO) in a different ratio. They are the esters of fatty acids and glycerol. They are also known as fats or oils. They are the major component of cell membranes. Lipids include fats, phospholipids, and steroids.

Nucleic acids are macromolecules composed of nucleotide units. Nucleotide units consist of a nitrogenous base, a sugar, and a phosphate group. They are the building blocks of DNA and RNA. The empirical formula of nucleic acids is C5H4O2N3P. They contain nitrogen, phosphorus, carbon, oxygen, and hydrogen. They do not have the empirical formula CHO.

Proteins are macromolecules composed of amino acids. They have a complex structure. Proteins are composed of carbon, hydrogen, oxygen, and nitrogen. Some proteins also contain sulfur and phosphorus. Therefore, they do not have the empirical formula CHO. Thus, out of the given options, none of the following have the empirical formula CHO.

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Answer:

When two or more atoms chemically bond together, they form a molecule. The bonds between the two hydrogen atoms and the oxygen atom in a molecule of water are covalent bonds.

Explanation:

The concentration of the HNO3 solution is 5.63 x 10^-2 M.

First, we need to find the number of moles of NaOH used in the titration:

0.225 M x 0.020 L = 0.0045 moles of NaOH

Since NaOH and HNO3 react in a 1:1 molar ratio, this means that there were also 0.0045 moles of HNO3 present in the original solution.

When 30.00 mL of the HNO3 solution is added to the mixture, the total volume becomes:

50.00 mL + 30.00 mL = 80.00 mL

Therefore, the concentration of the HNO3 solution can be calculated as follows:

0.0045 moles / 0.080 L = 0.05625 M or 5.63 x 10^-2 M

Therefore, the concentration of the HNO3 solution is 5.63 x 10^-2 M.

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Answer:

Explanation:

P.E=M*G*H

P.E=250*10*295

P.E=737,500J

1107 Joule is the amount of energy which is needed to change 88.0 g of solid benzene at 5.53°C into liquid benzene, also at 5.53°C.

In order to perform work and to produce heat and light, energy must be delivered to a body or to an external physical system. Energy is a quantitative property. Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed. 

A moving object's kinetic energy, an object's potential energy, an object's elastic energy, chemical energy linked to chemical reactions, electromagnetic radiation's radiant energy, and the internal energy of a thermodynamic system are examples of common kinds of energy.

mole of benzene = 85.2/78.11 =1.09mol

1 mole of benzene requires  10.19 kJ/mol energy

1.09 mole of benzene requires 1.09× 10.19 kJ/mol = 11.107kJ/mol energy

                                                                                  = 1107 Joule energy

Therefore,  1107 Joule is the amount of energy which is needed to change 88.0 g of solid benzene at 5.53°C into liquid benzene, also at 5.53°C.

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Answer

To answer this question we need to use the following equation

P1/T1 = P2/T2

We can rearrange to make T1 subject of the formula as shown

T1 = (P1 x T2)/ P2

= (3.40 x 340)/ 5.90

= 195.9 K

Answer:

use the equation moles = mass / rfm. we can't answer this because you haven't gave us the molar mass. if the question you have has 2 moles, divide the reactant by 2 to even it as well as the mass

Answer:

The answer is b

Explanation:

Hope it helps

b) electrons have a mass of 1 amu

electrons have a mass of 0 amu

The correct net ionic equation for the given reaction is option 3: 2OH⁻ + Fe²⁺ → Fe(OH)₂(s).

In a net ionic equation, we only include the species that actively participate in the reaction. The reaction shows that 2 moles of KOH (potassium hydroxide) react with 1 mole of FeCl₂ (iron(II) chloride) to form 2 moles of KCl (potassium chloride) and 1 mole of Fe(OH)₂ (iron(II) hydroxide) as a solid precipitate.

Breaking down the reaction into its ionic form, we have:
2KOH (aq) + FeCl₂ (aq) → 2KCl (aq) + Fe(OH)₂ (s)

The ionic equation can be further simplified by separating all the ions:
2K+ (aq) + 2OH⁻ (aq) + Fe²⁺ (aq) + 2Cl⁻ (aq) → 2K⁺ (aq) + 2Cl⁻ (aq) + Fe(OH)₂ (s)

In the net ionic equation, we eliminate the spectator ions (ions that are present on both sides of the equation and do not actively participate in the reaction), which are K⁺ and Cl⁻. Therefore, the net ionic equation is Option 3:
2OH⁻ (aq) + Fe²⁺ (aq) → Fe(OH)₂ (s)

This equation shows the actual chemical change occurring during the reaction, with hydroxide ions reacting with iron(II) ions to form a solid precipitate of iron(II) hydroxide.

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Answer:

I believe the Answer is B, as time is not dependent on growth, but growth is dependent on time.

Explanation:

Answer:

4.99 x 10⁻⁷ meters or 499 nanometers

Explanation:

Use the formula:

λ = c/ν, where λ = wavelength, c = the speed of light (it's constant, 2.998 x 10⁸ m/s), and ν = frequency

λ = (2.998 x 10⁸ m/s)/(6.01 x 10¹⁴ 1/s)

λ = 4.98835 x 10⁻⁷

Round to nearest hundreth and you get 4.99 x 10⁻⁷ meters, or 499 nanometers.

Answer:

The poster should include:

 TITLE: Creative name of superhero.

 DESCRIPTION OF ELEMENT SUPERHERO (2 PARAGRAPHS):

This section should include a brief description of how your superhero acquired, used, or lived

with their element power. You may want to describe where does your superhero element lives

(where in nature can it be found). What are his/her superpowers? Does your superhero

element have a hideout? What are his/her strengths? What is his/her weakness? Who is

his/her arch nemesis (evil super villain)? What kind of super suit does your superhero have?

 5 FACTS:

This section should include at least 5 fun facts about your element. You can choose to

describe facts that illustrate where your element is found in nature. You may also wish to

describe what is your element used for. You may address what are characteristics of your

element or what are important uses of your element. For example, can your element be made

into something useful or can your element combine with other elements to make something

totally different.)

 ATOMIC DRAWING

Include the atomic structure of your element with correct labeling of its protons neutrons,

electrons. Make sure your drawing has the correct number of protons, neutrons, electrons.

 DRAWING OF YOUR ELEMENT SUPERHERO

This section should include a drawing (in color) of your Element Superhero on a clean sheet of

WHITE paper. You may want to draw your Element Superhero fighting his nemesis (super

villain). Or you may want to draw your Element Superhero using his special powers.Explanation:

To determine the actual yield of casein in mg from 240 ml of whole milk, the given milk should be processed to remove the casein completely.The mass of the empty container should then be deducted from the mass of the container containing the dried casein to obtain the actual yield of casein.

The following steps are required to obtain the actual yield of casein in mg from 240 ml of whole milk: Measure 240 ml (1 cup) of whole milk. Add 10 ml of 1M acetic acid and stir well. Filter the milk using filter paper to obtain the curd. Dry the curd completely by keeping it in an oven for some time. Weigh the dried curd to obtain the actual yield of casein in mg.

To prevent the mass of water from being added to the dried curd, the product must be completely dry before measurement. Otherwise, the wet product might add the mass of water, resulting in more than 100% yield.The yield of casein is determined by subtracting the weight of the empty container from the weight of the container containing casein. The mass of the empty container should be deducted from the mass of the container containing the dried casein to obtain the actual yield of casein.

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Answer:

They have like charges

Explanation:

Like charges repel, opposite charges attract

The most likely reason the comb is able to repel the balloon is that, the balloon and the comb have the same electrical charge.

The question is incomplete, the complete question is;

One student rubs a balloon against his hair several times. Another student passes a comb through her hair several times. The students place the comb near the balloon and observe that the comb repels the balloon. Which is the most likely reason the comb is able to repel the balloon?

A.The balloon has a positive charge and the comb is neutral.

B. The balloon and the comb have the same electrical charge.

C. The balloon has a negative charge and the comb is neutral.

D. The balloon and the comb have opposite electrical charges

When the student rubs a balloon against his hair several times or another student passes a comb through her hair several times, static charges are built up on the balloon and the comb.

One of the ways by which a neutral object can be charged is by friction. That is, rubbing it against another object repeatedly.

The fact that when the students place the comb near the balloon and observe that the comb repels the balloon means that both the comb and the balloon acquired the same kind of charge after friction.

Therefore, the balloon and the comb have the same electrical charge.

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If the pH of a solution is decreased from 9 to 8, it means that the concentration of hydrogen ions (H+) has increased.

pH is a measure of the acidity or basicity of a solution and is defined as the negative logarithm (base 10) of the concentration of hydrogen ions (H+). A decrease in pH indicates an increase in the concentration of hydrogen ions.

As the pH decreases from 9 to 8, the solution becomes more acidic because the concentration of hydrogen ions increases. This is because the pH scale is logarithmic, meaning that each unit change in pH corresponds to a tenfold change in the concentration of hydrogen ions. Therefore, a decrease in pH by one unit signifies a tenfold increase in the concentration of hydrogen ions.

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When the pH of a solution is decreased from 9 to 8, it means that the concentration of hydrogen ions (H+) has increased.

When the pH of a solution is decreased from 9 to 8, it means that the concentration of hydrogen ions (H+) has increased.

The pH scale is a logarithmic scale that measures the concentration of hydrogen ions in a solution. As the pH decreases by one unit, the concentration of hydrogen ions increases tenfold. So, when the pH decreases from 9 to 8, it means that the concentration of hydrogen ions has increased by 10 times.

Therefore, a decrease in pH from 9 to 8 indicates an increase in the concentration of hydrogen ions in the solution.

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Answer:

Solids have a set shape and can't flow since their particles can only vibrate in a specific direction. They are unable to travel from one location to another.

Explanation:

According to the forces of attraction,particles  are in a fixed place and cannot move. They move around a fixed position in solids.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

Thus, particles  are in a fixed place and cannot move. They move around a fixed position in solids.

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Place the atomic number subscript and mass number superscript to the left of the atomic symbol.

The chemical properties of an atom are determined by its atomic number and are represented by the symbol Z. The total number of nucleons in an atom is the atomic mass number. This value is represented by the symbol A.

Isotopes are members of a family of elements that have the same number of protons and a different number of neutrons. The number of protons in the nucleus determines the atomic number of an element on the periodic table. Isotopes are atoms of the same element that contain the same number of protons but different numbers of neutrons.

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Answer:

C. people rely on ecosystem services provided by intact ecosystems

Explanation:

:) Comment was correct! <3

Protecting and managing biodiversity resources is a crucial part of maintaining ecological harmony and ensuring the survival of species' future generations so that they can live long healthy lives. The correct option is C.

In order to stop the extinction of species, biodiversity should be protected. To keep nature in balance, it is conserved. Other organisms will suffer if one species in the food chain becomes extinct.

The systems that sustain all life on Earth, including humans, depend on biodiversity. We cannot have the healthy ecosystems that we depend on to give us the air we breathe and the food we consume without a diverse variety of animals, plants, and microorganisms.

Thus the correct option is C.

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Based on the information in the table, the differences between the two mountain ranges are most likely due to the process of uplift and erosion.

The Appalachian Range has an average peak elevation of 900 meters and is composed of mostly sedimentary rock, which suggests that it is a very old mountain range that has undergone significant erosion over time. In contrast, the Himalayan Range has an average peak elevation of 6,000 meters and is composed of mostly sedimentary rock, which suggests that it is a relatively young mountain range that has undergone significant uplift.

The sharp, jagged peaks of the Himalayan Range are likely due to the process of uplift, which has caused the rock to be pushed upward, creating a more dramatic and rugged landscape.

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Answer: Alkanes are important raw materials of the chemical industry and the principal constituent of gasoline and lubricating oils. Natural gas mainly contains methane and ethane and is used for heating and cooking purposes and for power utilities (gas turbines).

Answer:

(i) In a bond amortization schedule, the book value represents the remaining amount of the bond principal that hasn't been paid off at a given point in time. When a bond is first issued, its book value equals its face value. As payments are made over the life of the bond, a portion of these payments reduces the book value. By the end of the bond's life, its book value will be zero, as the entire principal will have been paid off.

(ii) The formula for the book value B at time k, where k is the number of periods elapsed, is B = C + Cg - jan-kj.

Here:

- C is the redemption amount,

- g is the modified coupon rate per period,

- j is the yield rate per period, and

- a_n-kj is the present value of an annuity immediate with n - k periods at the yield rate j.

This formula states that the book value at any time k is the redemption amount plus the present value of the future coupon payments (Cg), minus the present value of the annuity that represents the repayments of the bond (jan-kj).

The amortized amount at time k is the change in the book value from time k-1 to time k, plus the coupon payment at time k. It represents the portion of the bond's principal (and interest) that has been repaid up to time k.

(iii) If K is defined as the present value of the redemption value C, according to the Makeham formula, (C-K) would represent the difference between the redemption value of the bond and its present value. This difference is the amount of interest that will accumulate over the life of the bond. In other words, (C-K) can be interpreted as the total interest that the bondholder will earn from holding the bond until redemption, assuming that all coupon payments are reinvested at the yield rate j.

Explanation:

Answer:

The statement "The measurement of very small amounts of electricity generated by different elements" is True.

Explanation:

In various scientific and industrial applications, it is essential to measure the small amounts of electricity produced by different elements. These measurements help us understand the properties of these elements and their potential applications in electrical devices and technology.

The smallest unit of electricity is an electron, yet selling electricity by the electron would be challenging, much as selling rice by the grain would not be feasible. We refer to the approximately 6.25 billion million million electrons that make up a coulomb of electricity as one coulomb.

When we rub a balloon against our sleeve to create static electricity, we are either transferring electrons from our sleeve to the balloon or the other way around. An electric charge is also produced when electrons are absent. It was convenient to refer to the two different types of charge as positive and negative since we are aware that the charge still on the balloon is equivalent to and in opposition to the charge on our sleeve.

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