A 100 n force pulls a box horizontally across a floor for 2 m. how much was done by the force of gravity (which pulls straight down on the box)?
a. 50 j
b. 0 j
c. 100 j
d. 200 j

Answer:

A neutralized solution in chemistry refers to the reaction between an acid and base that results in a neutral balance, or a measure of 7 on the pH scale.

Explanation:

Ammonia as proof that nitrate was converted to ammonia in the cultivation of nitrate broth Because amino acids are produced during protein synthesis, amino acid metabolism will always exist.

Nitrifying microorganisms in the soil change ammonia into nitrates. Nitrates are taken up by plants from the soil and used to assemble proteins. Animals may consume the plant, and its biomass may be used to produce animal protein.

The process of nitrate (NO3) being used as an electron acceptor for respiration microbes results in dissimilatory nitrate reduction to ammonium (DNRA), also known as nitrate/nitrite ammonification.

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As the elements combine, they react and generate chemical. Therefore, in below given way compounds can be summarized.

A compound seems to be a substance that is composed of two or more separate chemical elements mixed in a defined ratio in chemistry.

As the elements combine, they react and generate chemical connections that are hard to break. These bonds occur as a result of atoms sharing or exchanging electrons.

A                  non polar molecule solid

B                 a metal

C                 a polar molecule solid

D                 an ionic compound

E                 a giant molecular substance

Therefore, in above given way compounds can be summarized.

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.ANSWER

STEP-BY-STEP EXPLANATION

From the question given, you were asked to name a compound

Cobalt (II) Bromide Heptahydrate

The heptahydrate in the compound means it has 7 molecules of water

Therefore, the chemical formula can be written below as

Answer:

Deep cold water has a high density and warm, shallow water has a low density.

Explanation:

Because when it is cold, water shrinks together it acts as a factor for it to have a high density and it's deep which also acts as a factor because to deeper something is near the Earth's core the more pressure it has leads to high density as well because gravity is stronger near the Earth's core. When water is warm it has a low density which is the first factor and because it is shallow it is far from the earth's core it has a lower density and pressure.

The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

The frequency and wavelength of a wave are related by the following equation:

λf = c

Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.

in this case, λ = 676 nm = 6.76 x \(10^{-7\) m

c = 299,792,458 m/s

Making f the subject of the formula:

f = c/λ

  = 299,792,458/6.76 x \(10^{-7\)

  = 4.43 x \(10^{14\) hertz

In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

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The value of Ka for hypobromous acid (HBrO) is 5.3 × 10⁻⁹ at 25°C.


The pH of a 0.55 M aqueous solution of hypobromous acid (HBrO) at 25.0°C is 4.48. Hypobromous acid (HBrO) is a weak acid that partially dissociates into its constituent ions, hydrogen ions (H⁺) and hypobromite ions (BrO⁻), in solution. The equation for the dissociation of HBrO is given as follows:  HBrO + H₂O ⇌ H₃O⁺ + BrO⁻.

The value of Ka for HBrO can be calculated using the following equation: Ka = [H₃O⁺] [BrO⁻] / [HBrO]. The concentration of [HBrO] is equal to 0.55 M. The concentration of [H₃O⁺] can be calculated by converting pH to the [H₃O⁺] concentration using the equation pH = -log[H₃O⁺]. Thus, [H₃O⁺] = 10^(-pH) = 10^(-4.48).

The concentration of [BrO⁻] can be calculated from the equation: [HBrO] = [BrO⁻]. Therefore, [BrO⁻] = 0.55 M. Substituting the values in the Ka expression, we get Ka = (10^-4.48)(0.55) / 0.55 = 5.3 × 10⁻⁹ at 25°C.

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The conjugate base of a compound is what this compound will be after donating a H⁺.

The comopund in question is H₂BO₃⁻. After it loses 1 H⁺, it will have one less H atom and its charge decrease by one. Its charge is only with a "-" sign, which means its chargeis 1-. After decreasing by one, the charge becomes 2-.

So, the conjugate base will be HBO₃²⁻

N2O5 is the covalent compound formula for dinitrogen pentoxide.

Dinitrogen pentoxide or N2O5 is one chemical compound you may come across in your studies or work that deserves further examination. In its pure state this colorless crystalline solid takes on the role of being anhydride to nitric acid while also being highly reactive due to its powerful oxidizing characteristics.

This reactivity lends itself well to various manufacturing processes such as fertilizer and explosive production alongside other compounds where oxidation plays a vital role.

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Complete question:

What is the covalent compound formula for N2O5?

The “33 percent more for free” deal is better than the “33 percent off” deal. This is because the “33 percent more for free” deal gives you 13.3 ounces of coffee for $10, while the “33 percent off” deal gives you only 6.7 ounces of coffee for $6.67

For the “33 percent more for free” deal:

10 dollars for 10 ounces of coffee

13.3 ounces of coffee for 10 dollars (33% more)

Price per ounce = 10/13.3 = $0.75 per ounce

For the “33 percent off” deal:

10 dollars for 10 ounces of coffee

6.7 ounces of coffee for $6.67 (33% off)

Price per ounce = 6.67/6.7 = $0.99 per ounce

So, the “33 percent more for free” deal is better than the “33 percent off” deal because you get more coffee for your money.

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Answer:

I hope it's helpful for you...

Explanation:

water traps heat and holds it deep inside the ocean .....

I think it's correct answer

In an ecosystem, water  traps heat and holds it deep inside the ocean there by heating earth.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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The statement oxygen is negative and hydrogen is positive is true.

Charge on an element is determined by the position of an element in the periodic table.More precisely,it is determined by an element's electronic configuration.

Elements having one electron in their outermost or valence shell are  situated to the left of the periodic table and are positive as they  loose their one electron present in valence shell to form cations that are positively charged ions.

Elements having six or seven electrons in their valence shell tend to gain one or two electrons respectively to complete their octet.These elements form anions that are negatively charged ions.

Hydrogen with atomic number 1 has 1 electron in it's valence shell which it looses to acquire a positive charge and hence form a cation .

Oxygen on the other hand,with atomic number 8 has 6 electrons in it's valence shell and thus gains 2 more electrons to complete the octet,and hence gain a negative charge and form an anion.

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The standard enthalpy change for the given reaction is approximately -156.87 kJ.

To calculate the standard enthalpy change (ΔH°) for the given reaction using standard heats of formation, the balanced equation for the reaction is:

Fe(s) + 2HCl(aq) → \(FeCl_2\)(s) + \(H_2\)(g)

The standard heats of formation (ΔH°f) for the compounds involved are as follows:

Fe(s): 0 kJ/mol

HCl(aq): -92.31 kJ/mol (source: NIST Chemistry WebBook)

\(FeCl_2\)(s): -341.49 kJ/mol (source: NIST Chemistry WebBook)

\(H_2\)(g): 0 kJ/mol

Now, let's calculate the standard enthalpy change (ΔH°):

ΔH° = Σ(ΔH°f products) - Σ(ΔH°f reactants)

ΔH° = [ΔH°f(\(FeCl_2\)) + ΔH°f(\(H_2\))] - [ΔH°f(Fe) + 2ΔH°f(HCl)]

ΔH° = [-341.49 kJ/mol + 0 kJ/mol] - [0 kJ/mol + 2(-92.31 kJ/mol)]

ΔH° = -341.49 kJ/mol + 2(92.31 kJ/mol)

ΔH° = -341.49 kJ/mol + 184.62 kJ/mol

ΔH° = -156.87 kJ/mol

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Approximately, 259.2 grams of potassium bromide can dissolve at 324 grams of water in 55 degrees

What is potassium bromide?

Potassium bromide is a salt that is formed from the elements potassium and bromine. It is a white crystalline solid with a salty taste and is soluble in water.

Potassium bromide has a wide range of applications, including its use as a medication to treat epilepsy and as a sedative for animals. It is also used in the production of photographic paper, as a flame and in the preparation of various chemicals.

Therefore, 259.2 grams of potassium bromide can dissolve at 324 grams of water in 55 degrees

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Answer: the lll newton law

Explanation:

it jus is

The sets in σ(A,B) are the smallest σ-algebra that contains both A and B.

In probability theory and measure theory, a σ-algebra is a collection of subsets of a given set Ω that satisfies certain properties. The notation σ(A,B) represents the smallest σ-algebra that contains both subsets A and B. This means that σ(A,B) consists of all possible subsets that can be formed by taking the union, intersection, and complement of sets in A and B.

To understand this concept better, let's consider an example. Suppose we have a set Ω = {1, 2, 3, 4} and two subsets A = {1, 2} and B = {2, 3}. The σ-algebra σ(A,B) would include the empty set, the set Ω itself, as well as other subsets such as {1}, {2}, {3}, {1, 2}, {2, 3}, and {1, 2, 3}. It would also include their complements, for example, the complement of {1} would be {2, 3, 4}.

The σ-algebra σ(A,B) is important in probability theory as it allows us to define probability measures and study various properties of events and random variables. By identifying all the sets in σ(A,B), we can determine the range of events that can be analyzed within this framework.

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Answer:

nah

Explanation:

dont wast my points

The ion is sodium ion.

An ion is obtained by the removal of an electron from an atom. An ion could be positively charged or negatively charged. If the ion contains more electrons than protons then it is positively charged and vice versa.

An ion is positive when electrons are lost and the ion is negative when electrons are gained. In a negative charge, the electron cloud spreads out and the ion becomes larger. When we have a positive ion, the ion is smaller than the neutral atom.

Now, we can see that neon has an atomic number of 20 thus it has 10 electrons. If the ion contains one more proton then the atomic number of the element is 11. We are told that it contains two more neutrons hence the mass number is 22.

Given that the both species have the same number of electrons thus the ion must be sodium ion.

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Answer:

When substance A is combined with substance B to produce a mixture, the chemical characteristics of one or both substances may alter. The specific characteristics and reactivity of the chemicals involved determine the magnitude and form of these alterations.

Explanation:

Substance A's chemical characteristics may stay constant in some instances, whereas substance B undergoes a chemical reaction or alteration. If substance A is inert, such as sand or sugar, and substance B is reactive, such as acid, the acid may react with or dissolve the sand or sugar, resulting in a chemical change in substance B.

Substance A may, on the other hand, undergo a chemical change while substance B stays intact. This can happen if substance A is reactive or reacts in the presence of substance B. For example, if A is a metal and B is an acid, the metal may undergo a chemical reaction with the acid, resulting in the production of a new compound or gas.

Furthermore, there are circumstances in which both compounds A and B undergo chemical modifications when they are mixed. This can happen when two chemicals react, leading in the production of new compounds or products.

To summaries, when substance A is mixed with substance B, the possibility of chemical property changes exists.

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Answer:

protons(positively charged) and the neutrons (no charge)

Explanation:

Answer:

The nucleus of an atom contains protons and neutrons.

Answer:

la photosintesis viene de la clorofila de la planta

The pH at the equivalence point of a weak base-strong acid titration can be determined using the Henderson-Hasselbalch equation.

In this case, the weak base is sodium hypochlorite (NaOCl), and the strong acid is hydrochloric acid (HCl). Given that 20.00 mL of NaOCl requires 28.30 mL of 0.50 M HCl, we can calculate the moles of HCl used. The balanced chemical equation for the reaction between NaOCl and HCl is: NaOCl + HCl → HClO + NaCl. Since the molar ratio between NaOCl and HCl is 1:1, the moles of HCl used is equal to the moles of NaOCl used. By dividing the moles of HCl used by the total volume of the NaOCl solution (20.00 mL), we can determine the concentration of HCl. Next, we can use the dissociation constant (Ka) of HClO (the conjugate acid of NaOCl) to calculate the concentration of HClO at the equivalence point. From the balanced chemical equation, we know that one mole of NaOCl reacts with one mole of HCl to form one mole of HClO. Therefore, the concentration of HClO is equal to the concentration of HCl at the equivalence point. Finally, using the Henderson-Hasselbalch equation, we can calculate the pH at the equivalence point by plugging in the values for the concentration of HClO and the Ka of HClO. It is important to note that in this specific case, the concentration of HClO will be very low due to the weak acid nature of HClO. Consequently, the pH at the equivalence point will be acidic.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

we have

\(n = \frac{1.88 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 31.229235...\)

We have the final answer as

Hope this helps you

Human breathing contributes approximately 1.837% of the total global CO₂ emissions.

To calculate the percentage of CO₂ emitted by human breathing out of the total global emissions, we first need to convert the values to the same unit.

1 kg of CO₂ is equivalent to 0.001 metric tons (1 metric ton = 1000 kg).

So, the total CO₂ emissions from human breathing per day can be calculated as:

Number of People * CO₂ emitted per person per day

= 7.9 billion * 0.001 metric tons

= 7.9 million metric tons

To find the percentage contribution, we divide the emissions from human breathing by the total global emissions and multiply by 100:

Percentage Contribution = (Emissions from Human Breathing / Total Global Emissions) * 100

= (7.9 million metric tons / 43 billion metric tons) * 100

= (0.0079 / 43) * 100

= 0.01837 * 100

= 1.837%

Therefore, human breathing contributes approximately 1.837% of the total global CO₂ emissions.

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The given structure is of formaldehyde an organic compound and it is acidic in nature.

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Answer:

0.282 M

Explanation:

Please see the step-by-step solution in the picture attached below.

Hope this answer can help you. Have a nice day!

The concentration of the 15.0 mL sample of HCl is 0.282 M.

To find the concentration of HCl, we can use the concept of stoichiometry and the balanced chemical equation for the reaction between HCl (acid) and NaOH (base):

\(HCl + NaOH - > NaCl + H_2O\)

The balanced equation shows a 1:1 mole ratio between HCl and NaOH. Therefore, the moles of HCl that reacted will be equal to the moles of NaOH used at the equivalence point.

First, we find the moles of NaOH used:

Moles of NaOH = Volume (in L) × Concentration

Moles of NaOH = 0.0282 L × 0.150 mol/L = 0.00423 mol

Since the moles of HCl and NaOH are equal, the moles of HCl are also 0.00423 mol.

Now, we calculate the concentration of HCl:

Concentration of HCl = Moles of HCl / Volume (in L)

Concentration of HCl = 0.00423 mol / 0.0150 L = 0.282 M

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Answer:

The correct answer is -

3. Butyne

4. Pentene

Explanation:

The names of such organic compounds are classified on the number of the carbon atoms and based on a number these prefixes are attached -

Meth - one carbon

Eth - two carbons

Prop - three carbons

But - four carbons

Pent - five carbons, and so on

The bonds can be identified by names of an organic compound by their suffixes -

- ane = single bond

- ene = double bond

-yne = triple bond

Thus, for question 3, carbon numbers are 4 and triple bond so Butyne, and similarly for question 4, 5 carbon atoms and double bond so Pentene.

The wavelength of the electron is 1085nm.

The wavelength refers to the horizontal distance that is covered by a wave. Now we know that according to the Bohr Model of the atom, electrons move from a higher to a lower energy level leading to the emission of a ray of light with a characteristic wavelength.

Now Using the formula;

1/λ = RH (1/n2^2 - 1/n1^2)

Where;

λ = wavelength

n1 = initial energy level

n2 = final energy level

RH = Rydberg's constant

1/λ = 1.097 * 10^7(1/3^2 - 1/6^2)

1/λ =  1.097 * 10^7( 0.111 - 0.027)

λ =  1.085 * 10^-6 m or 1085nm

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