Is a single piece of evidence enough to show that a hypothesis is not supported?​

0.81 moles of O2 would be produced if 1.62 moles of H2O2 were to undergo decomposition

The balanced chemical equation for the decomposition of hydrogen peroxide (H2O2) is:

2 H2O2 → 2 H2O + O2

This means that for every 2 moles of hydrogen peroxide, 1 mole of oxygen gas is produced. So to calculate the number of moles of O2 produced when 1.62 moles of H2O2 decompose, we need to use a proportion:

2 mol H2O2 : 1 mol O2 = 1.62 mol H2O2 : x mol O2

where "x" is the number of moles of O2 produced.

To solve for "x", we can cross-multiply and simplify:

2 mol H2O2 * x mol O2 = 1 mol O2 * 1.62 mol H2O2

2x = 1.62

x = 0.81

Therefore, 0.81 moles of O2 would be produced if 1.62 moles of H2O2 were to undergo decomposition.

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The original size of the carbon-14 sample can be calculated using the concept of radioactive decay and the half-life of carbon-14. Based on the given information, the original sample size was approximately 416 grams.

The decay of a radioactive substance can be described by the equation N = N0 * (1/2)^(t/t1/2), where N is the current amount, N0 is the initial amount, t is the time elapsed, and t1/2 is the half-life of the substance.

In this case, the current amount N is 52.0 grams, the time elapsed t is 17,190 years, and the half-life t1/2 of carbon-14 is 5,730 years. We need to solve for the initial amount N0.

Rearranging the equation, we have:

N0 = N * (2^(t/t1/2))

Substituting the known values, we get:

N0 = 52.0 * (2^(17190/5730))

Calculating the exponent and evaluating the expression, we find:

N0 ≈ 52.0 * 0.125

N0 ≈ 6.5

Therefore, the original size of the carbon-14 sample was approximately 6.5 grams.

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Answer:

-171.79 KJ

Explanation:

We must keep in mind that water freezes at 0 degrees centigrade

Recall that heat lost during freezing can be obtained from;

H = mc(θ2 - θ1)

m = mass of the water = 350 g/1000 = 0.35 Kg

c = specific heat capacity of water = 4,200 J/kg°C

θ2 = final temperature = 0°C

θ1 = initial temperature = 37°C

H= 0.35 * 4,200 * (0 - 37)

H = -54390 J = -54.39 KJ

Energy given out when 1 mole of water freezes at its freezing point = -6.04 kJ

For 350 g of water; 350 g/18 g/mol *  -6.04 kJ  = -117.4 kJ

Hence total energy removed = (-54.39 KJ) + (-117.4 kJ) = -171.79 KJ

Answer:

Wal-mart XDDDDD

Explanation:

most bacteria have flagellum, also nerve cells are larger

The correct answer is option A.

In an atom, electrons are tiny subatomic particles with a negative charge.

An atom consists of three fundamental subatomic particles called electrons, protons and neutrons.

In general, electrons are negatively charged particles, protons carry a positive charge and neutron have no charge which makes them  neutral particles.

In the center of an atom, there is a dense positively charged circular shaped object called nucleus in which protons and neutrons reside.

While electron are found in the outer regions of the atoms where they revolve around the atom in orbits called shells.

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Answer

1.25M

Explanation

to calculate the molality we use the following equation

Molality = moles of solute / Kg of solvent

step 1: to find the moles of glucose we divide the mass by the Molar mass of glucose

moles = mass (g)/ Molar mass (g/mol)

= 18.0 g / 180,156 g/mol

= 0.0999 moles of glucose

now that we have moles of glucose, the next step is to convert 80.0g of water to Kg of water

1 kg = 1000g

Kg of water = 80g/1000g /kg

= 0.08Kg

Molality = 0.0999 mols / 0.08 kg

= 1.25M

Answer:

Its 2 and 3

Explanation:

Answer:

1. Carbon

2. C

3.  Oceans

4. This is the hardest question so far :(

5. Most of every diamonds are colorless and clear, but are in a category of brown or pale yellow color that is called the normal color range.

6. has to be refraction.

Pls mark me brainly!

Answer:

pretty sure -10 degrees

Explanation:

no explanation

This problem is providing us with the initial temperature of 40 g of ice as -15 °C, so the heat involved in the process to heat it up to 16.5 °C is required as well as the type of process, endothermic or exothermic. At the end, we obtain 17.4 kJ as the total heat and the process to be endothermic.

In chemistry, we can quantify the energy that is involved in a phase change by considering every sub-process that takes place from the initial temperature to the final one. In such a way, since this block of ice must first heat to 0 °C, then melt and finally heat to 16.5 °C, one infers three heat terms are needed; two sensible-based and one latent-based:

\(Q_T=Q_1+Q_2+Q_3\)

Hence, we define and calculate each term as follows:

\(Q_1=m*C_{ice}*(0\°C-(-15\°C))=40g*2.093\frac{J}{g*\°C}(15\°C)=1255.8J\\ \\Q_2=m*\Delta _mH=40g*333.55\frac{J}{g} =13342J\\\\Q_3=mC_{water}(16.5\°C-0\°C)=40g*4.184\frac{J}{g*\°C}(16.5\°C)=2761.4J\)

Finally, we add them together to obtain:

\(Q_T=17359.2J*\frac{1kJ}{1000J}\\ \\Q_T=17.4kJ\)

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The correct formula for the compound copper I sulfate is Cu2SO4. Here's the explanation:Chemical formulas are used to express the chemical composition of compounds in a simple manner.

In these formulas, chemical symbols are employed to signify elements while subscripts are used to specify the number of atoms or ions of each element in the molecule.For example, the formula for water is H2O, which means that each water molecule contains two hydrogen atoms and one oxygen atom.

Copper I sulfate, like all other ionic compounds, has a formula that reflects its chemical composition. Copper I sulfate is formed by the combination of copper I ions (Cu+) and sulfate ions (SO42-).

The copper I ion has a charge of +1, while the sulfate ion has a charge of -2. As a result, in order to achieve electrical neutrality, two copper I ions must combine with one sulfate ion.To express the chemical composition of copper I sulfate in formula notation, we can use subscripts to indicate the number of atoms or ions of each element present in the molecule.Therefore, the formula for copper I sulfate is Cu2SO4.

The two copper I ions and one sulfate ion in the molecule are indicated by the subscripts 2 and 1, respectively.

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Explanation:

In a physical change the nature of the substance, the particles of which it is composed and the numbers of particles remain unchanged. In a chemical change the properties of the new substances are different from the original, the particles are different and the number of particles can change

The formation of ionic bonds between elements from Group I (alkali metals) and Group VII (halogens) occurs through a transfer of electrons. Alkali metals have one valence electron in their outermost shell, while halogens require one more electron to complete their outermost shell and achieve a stable electron configuration.

Let's take the example of sodium (Na) from Group I and chlorine (Cl) from Group VII to illustrate the formation of an ionic bond. Sodium has one valence electron, while chlorine requires one electron to complete its outer shell.

In a dot-and-cross diagram, sodium is represented by the symbol Na, with a dot next to it representing its single valence electron. Chlorine is represented by the symbol Cl, with seven dots around it representing its seven valence electrons.

To form an ionic bond, sodium will transfer its single valence electron to chlorine. This results in sodium losing one electron to become a positively charged sodium ion (Na+), as it now has one less electron than protons. Chlorine, on the other hand, gains the electron from sodium, resulting in a negatively charged chloride ion (Cl-), as it now has one more electron than protons.

In the dot-and-cross diagram, the electron transfer is represented by an arrow from sodium to chlorine, indicating the movement of the electron. The final configuration shows the sodium ion (Na+) with no dots around it, indicating the loss of its valence electron, and the chloride ion (Cl-) with eight dots around it, representing the complete octet in its outermost shell.

The resulting sodium ion and chloride ion are held together by the strong electrostatic attraction between the oppositely charged ions. This attraction forms an ionic bond, creating an ionic compound known as sodium chloride (NaCl), commonly known as table salt.

This process of electron transfer and formation of ionic bonds occurs between elements from Group I and Group VII, leading to the creation of stable compounds with full outer shells for both elements.\(\huge{\mathcal{\colorbox{black}{\textcolor{lime}{\textsf{I hope this helps !}}}}}\)

♥️ \(\large{\textcolor{red}{\underline{\texttt{SUMIT ROY (:}}}}\)

The first step of the reaction, we have  reaction between a nucleophile and an electrophile.

We can see that in the first step of the reaction, we have  reaction between a nucleophile and an electrophile. In this case, the electrophile would have to be an alkyl halide which produces a carbocation as show in the image attached. What we have here is quite similar or  like most of the organic reactions, this reaction occurs in a number of detailed or smaller steps and each step of the reaction is going to help to bring us closer to the end product of the entire steps of the reaction which is wat we target as we carry out the particular reaction.The second step involves the reduction of the alkyne with the use of a Lindlar catalyst. As such the reaction is poisoned and it stops at the alkyne stage rather than going on to obtain the alkane.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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The correct option is (c) 101.55.

What is copper fluoride used for?

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The standard enthalpy change for the reaction Si(s) + 2F₂(g) → SiF₂(g) can be calculated using the data in Appendix G.

To calculate the standard enthalpy change for a reaction, we need to use the standard enthalpies of formation (∆H_f°) of the reactants and products. The standard enthalpy of formation is the enthalpy change when one mole of a compound is formed from its constituent elements in their standard states.

In this case, we can use the following data from Appendix G:

∆H_f°[Si(s)] = 0 kJ/mol

∆H_f°[F₂(g)] = 0 kJ/mol

∆H_f°[SiF₂(g)] = -161.2 kJ/mol

The standard enthalpy change (∆H°) for the reaction can be calculated using the equation:

∆H° = ∑∆H_f°(products) - ∑∆H_f°(reactants)

For reaction (a), the calculation would be:

∆H° = ∆H_f°[SiF₂(g)] - [∆H_f°[Si(s)] + 2∆H_f°[F₂(g)]]

∆H° = -161.2 kJ/mol - [0 kJ/mol + 2(0 kJ/mol)]

∆H° = -161.2 kJ/mol

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The temperature of the mesosphere is much higher than the asthenosphere overall, but yet is is still a ductile solid. The thing that keeps it from melting is high pressure.

The mesosphere plays a crucial role in protecting the earth. Most meteors and asteroids are destroyed by the mesosphere before they can impact the earth's surface.

An area of the Earth's atmosphere is called the mesosphere. Directly above the stratosphere and beneath the thermosphere lies the mesosphere. It covers a distance of 31 to 53 miles, or 50 to 85 kilometers, above our planet. The mesosphere's temperature falls with height.

It should be noted that this high pressure that keeps it solid in form and does not let it melt down.

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The temperature of the mesosphere is much higher than the asthenosphere overall, but yet is is still a ductile solid. what keeps it from melting?

Cool temperature

Distance from the sun.

High pressure

Low pressure

The three components of light Nature combines the soft, scattered light from the sky with the vibrant, focused light from the sun. Units are Candela, Lumen, Lux.

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Zoloft (sertraline) comes under Selective serotonin reuptake inhibitor (SSRI) antidepressants

Mellaril (thioridazine) comes under Typical antipsychotics

Thorazine (chlorpromazine)comes under Typical antipsychotics

Valium (diazepam)comes under Anti-anxiety agents

By raising serotonin levels in the brain, SSRIs alleviate depression. One of the chemical messengers, or neurotransmitters, that communicate between brain nerve cells is serotonin (neurons). Serotonin reabsorption (reuptake) into neurons is inhibited by SSRIs.

Typical antipsychotics can be used to treat conditions like extreme agitation or schizophrenia.

a medication used to alleviate anxiety symptoms such the fear, dread, unease, and tightness in the muscles that can happen when under stress. The majority of anti-anxiety medications prevent particular nervous system molecules from acting. Additionally known as anxiolytic and anxiolytic agent.

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Answer:

c

Explanation:

the rest are chemical properties

Nitrox diving may require additional thermal protection since oxygen-rich gas mixes lose more heat than air does.

While diving with nitrox gas mixtures, more heat protection may be needed due to the gas mixture's higher oxygen concentration.

Oxygen-rich gas mixtures may cause more heat loss because oxygen molecules leave the body more often than nitrogen ones do.

This happens as oxygen molecules are smaller and more prone to leave the body's tissues.

Additionally, by breathing an oxygen-rich gas combination, the body may release less heat.

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The net ionic equation for the reaction between formic acid (HCOOH) and sodium hypochlorite (NaClO) can be written as follows:

HCOOH + ClO- → HCOO- + H+ + Cl-

In this reaction, formic acid (HCOOH) reacts with sodium hypochlorite (NaClO) to produce formate ion (HCOO-), hydrogen ions (H+), and chloride ions (Cl-).

The balanced equation for the reaction is:

2 HCOOH + NaClO → 2 HCOO- + Na+ + Cl2

However, in the net ionic equation, spectator ions (Na+ and Cl-) are eliminated, leaving only the ions that are directly involved in the reaction.

Formic acid is a weak acid, and sodium hypochlorite is a strong oxidizing agent.

The reaction between them is a redox reaction in which sodium hypochlorite oxidizes formic acid, leading to the formation of formate ion and chloride ion.

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Answer:

the internal force of attraction between the particle or molecules.

In solids the force is max.

In liquid it is intermediate.

And least in the gases..

SN

1:1

So lf you multiply N with 4 you have to multiply the s with the same number

the answer Will be sS4N4

easy

Answer:

Start with your basic equation for pH

pH = - log [H+]

then rearrange the equation to solve for [H+]

just like to get move something multiplied from the one side to the other you divide both sides by that number ( a*b = c …. a*b/b = c/b …. a = b/c), you do the ‘inverse’ of a log function, which is 10^

first bring the - over

-pH = log [H+]

then remove the log by taking 10^ on both sides

10^(-pH) = 10^(log [H+])

10^(-pH) = [H+]

and there is your relationship.

Explanation:

There is differ motion you go through the day translational, rotational, periodic, and non periodic motion.

Hope this helped you

Sorry if it wrong

Answer:

Option B

Explanation:

Avagadro's hypothesis showed that at constant temperature and pressure equal volume of all gases contains equal no of molecules.

Avagadro's constant is known as 6.022×10^23

Which of the following represents Avogadro's hypothesis?

Avogadro's hypothesis is an experimental gas law that relates to the volume of gas to the amount of gas present. Its formula is :

\( \sf \frac{V_1}{ n_{1} } = \frac{V_2}{ n_{2} } \)

Where,