A 28.2 mL sample of 0.147 M formic acid (HCHO₂) is titrated with 0.147 M NaOH. Calculate the pH her the addition of 28.2 mt of a (For HCHO₂: K₂ = 1.76 × 10-4) Hint: Determine the equivalence po

Answer:

i think its a if not sorry i have it in a test right now

Explanation:

Answer:

force is you can force it in how it do

Answer: The 2 forces acting on the anvil are  weight and the pull of the  Gravity

Explanation:

The shortest distance taken by the object to reach the destination at a minimum time is called acceleration. Thus value acceleration depends upon the displacement and time.

answer; the last two is me and u :

Ca(s)+ 2H2O(l) ---> Ca2(aq) + 2OH-(aq) + H2(g)

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Answer:

Mass = 19.53 g

Explanation:

Given data:

Number of atoms of iron = 2.10 ×10²³ atoms

Mass of iron = ?

Solution:

The number 6.022 ×10²³ is called Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

1 mole contain 6.022 ×10²³ atoms

2.10 × 10²³ atoms ×  1 mol / 6.022 ×10²³ atoms

0.35 mol

Mass of iron atoms:

Mass = Number of moles × molar mass

Mass = 0.35 mol × 55.8 g/mol

Mass = 19.53 g

A food web is better to understand the feeding relationship among the organism than the food chain because it has more number of participants.

A food chain is a linear relationship between the organism but the food web is a combination of several food chains that are interconnected together to form a web like structure.

The food web is a better option to understand and represent the feeding relationship between any two organism because they have more number of member in the food web. They crosslinks each other and one organism participate into more than one food chain that more practically correct.

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Luster is how the surface of a mineral reflects light. It is not the same thing as color, so it crucial to distinguish luster from color. For example, a mineral described as “shiny yellow” is being described in terms of luster (“shiny”) and color (“yellow”), which are two different physical properties.

Answer:

It is definitly Luster

Explanation:

How shiny something is or how its acts in the sun

Answer:

Q = 5949.35 J

Explanation:

Given that,

The mass of water, m = 189.5 grams

Initial temperature, T = 16.4 °C

Final temperature, T' = 8.9°C

We need to find the thermal energy the water use to melt the ice cube. The thermal energy is given by :

\(Q=mc\Delta T\)

Where

c is the specific heat of the water, c = 4.186 joule/gram °C

So,

\(Q=189.5\times 4.186 \times (8.9-16.4)\\Q=-5949.35\ J\)

So, the required amount heat is equal to 5949.35 J.

Taking into account the definition of calorimetry, the specific heat of the unknown metal is 0.9 \(\frac{J}{gC}\) and the metal is aluminum.  

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

For unknown metal: Qmetal= \(c_{unknown metal}\) × 10 g× (21.6 C - 100 C)

For water: Qwater= 4.186 \(\frac{J}{gC}\)× 100 g× (21.6 C - 20 C)

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qmetal = + Qwater

- \(c_{unknown metal}\) × 10 g× (21.6 C - 100 C)=4.186 \(\frac{J}{gC}\)× 100 g× (21.6 C - 20 C)

Solving:

- \(c_{unknown metal}\) × 10 g× (- 78.4 C)= 669.76 J

\(c_{unknown metal}\) × 784 gC= 669.76 J

\(c_{unknown metal}\) = 669.76 J÷ 784 gC

\(c_{unknown metal}\) = 0.854 \(\frac{J}{gC}\) ≅ 0.9 \(\frac{J}{gC}\)

Finally, the specific heat of the unknown metal is 0.9 \(\frac{J}{gC}\) and the metal is aluminum.  

Learn more:

Answer:Label the parts of this wave.

A:  

✔ crest

B:  

✔ amplitude

C:  

✔ trough

D:  

✔ wavelength

Explanation:

Answer:

A- crest

B- Amplitude

C- Trough

D- wavelength

Explanation:

Just did it on Edge Trust me 2022

Answer:

21

Explanation:

Answer:

Because Disaccharides have more chemical bonds.

Explanation:

It is true that flavour compounds can exhibit hydrophilic or hydrophobic properties, can be highly volatile, and can be analyzed using a gas chromatograph. The correct answer is: "All of the above."

Flavour compounds can possess different characteristics that contribute to their unique properties. In this case, when considering the given answer choices, it is true that flavour compounds can exhibit hydrophilic or hydrophobic properties, can be highly volatile, and can be analyzed using a gas chromatograph.

Flavour compounds are often composed of a diverse range of molecules, some of which are water-soluble (hydrophilic) and some that are oil-soluble (hydrophobic). These properties play a crucial role in determining their interactions with different food components and their overall sensory perception.

Additionally, flavour compounds are known for their volatility, meaning they can easily vaporize at relatively low temperatures. This characteristic contributes to their ability to be perceived by the olfactory system and contributes to the overall flavour profile of a substance.

Gas chromatography is a widely used analytical technique for separating and identifying volatile compounds, making it particularly suitable for the analysis of flavour compounds. By using a gas chromatograph, the different components of a flavour mixture can be separated based on their unique physicochemical properties and detected with high sensitivity.

Therefore, the correct answer is: "All of the above."

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The reaction of benzaldehyde with acetone and sodium hydroxide produces dibenzylideneacetone. This is an example of a condensation reaction, specifically a crossed aldol condensation.

In this reaction, benzaldehyde and acetone undergo a nucleophilic addition reaction with the strong base sodium hydroxide. The sodium hydroxide deprotonates the alpha-carbon of the carbonyl group in both benzaldehyde and acetone, creating nucleophilic enolate intermediates. The enolate of acetone then attacks the carbonyl group of benzaldehyde, forming an intermediate that subsequently loses a water molecule, leading to the formation of dibenzylideneacetone.

Dibenzylideneacetone is a yellow solid and is used as a UV absorber, as a flavoring agent, and in the preparation of fragrances. The crossed aldol condensation reaction is an important synthetic route to form α,β-unsaturated carbonyl compounds, which have numerous applications in organic chemistry.

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Answer:

The last one

Explanation:

I have done this before

Answer:

Earth's plates moving & colliding against one another.

The melting point of (2R,3S)-2,3-dibromo-3-phenylpropanoic acid is dependent on several factors, including the purity of the compound and the presence of any impurities.

Therefore, an exact melting point cannot be provided without specific experimental data. However, it is generally observed that organic compounds have a range of melting points rather than a single specific value.

If you are conducting an experiment and need to determine the melting point of (2R,3S)-2,3-dibromo-3-phenylpropanoic acid, it is recommended to perform the melting point determination experimentally using appropriate laboratory techniques and equipment. This involves heating a small amount of the compound and observing the temperature range at which it melts. The observed melting point can then be compared to known literature values to assess the purity of the compound.

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Answer:

A options hydrogen

Explanation:

valence outermost element is hydrogen.

Answer:

Explanation:

Here, we want to get the number of moles of NO gas that can be formed

To answer this, we need to be sure of the limiting reagent

The limiting reagent is the one that is responsible for the number of moles of product formed

From the shown balanced equation of reaction, 3 moles of silver produced 1 mole of the gas

Thus, 0.1 mol of powdered silver will produce:

For the nitric acid, we need to get the number of moles that reacted

To get this, we have to multiply the volume (in L) that reacted by the molarity

Mathematically, we have that as:

From the equation of reaction, 4 moles of the nitrate gave 1 mole of the gas

Thus, we have it that 0.06 moles will give:

From what we see, the number of moles produced by the nitrate is less than what was produced by the solid

Thus, the nitrate is the limiting reagent and the number of moles of the gas produced is 0.015 mol

Answer:

Your answer will be "Over the ocean"

Explanation:

Have a good day/night

Hope this helps! :)

Mark as brainliest?

Answer:
I think it's land or lakes and rivers

Answer:

\(\boxed {\boxed {\sf 2. \ 157 \ kPa}}\)

Explanation:

Since temperature remains constant, the only variables that change are volume and pressure. Therefore, we are using Boyle's Law. This states that the pressure is inversely proportional to the volume. The formula is:

\(P_1V_1=P_2V_2\)

We know the gas starts with a volume of 20.0 liters at a pressure of 275 kPa. We can substitute these values into the left side of the formula.

\(275 \ kPa *20.0 \ L=P_2V_2\)

We know the gas expands to a volume of 35.0 Liters, but we do not know the pressure.

\(275 \ kPa *20.0 \ L=P_2* 35.0 \ L\)

Since we are solving for the new pressure, we must isolate the variable P₂. It is being multiplied by 35.0 Liters and the inverse of multiplication is division. Divide both sides by 35.0 L.

\(\frac {275 \ kPa * 20.0 \ L}{ 35.0 \ L}= \frac{P_2*35.0 \ L}{35.0 \ L}\)

\(\frac {275 \ kPa * 20.0 \ L}{ 35.0 \ L}=P_2\)

The units of liters cancel.

\(\frac {275 \ kPa * 20.0 }{ 35.0 }=P_2\)

\(\frac {5500}{35.0} \ kPa= P_2\)

\(157.142857 \ kPa=P_2\)

The original measurements of pressure and volume have 3 significant figures, so our answer must have the same. For the number we calculated, that is the ones place.

The 1 in the tenths place (157.142857) tells us to leave the 7 in the ones place.

\(157 \ kPa= P_2\)

If the gas expanded to a volume of 35.0 liters while the temperature remained constant, the pressure in container was approximately 157 kilopascals.

Answer: Atomic mass is associated with the number of neutrons and protons that are present in a particular nucleus of an element. Atomic number is usually the number of protons present in an element's nucleus

If you want to find the number of protons and electrons you look at the atomic number. If you want to find the number of neutrons you need to subtract the atomic number from the mass. If the mass have something like 35.453 the mass will be 35. But if it's like 10.811 the mass will be 11 because if the number after the decimal is five or higher then the number before the decimal will go up one.

Explanation:

SO3 only would exist as a set of resonance structures

Define resonance.

In valence bond theory, resonance, also known as mesomerism, is a means to describe bonding in specific molecules or polyatomic ions by combining numerous contributing structures into a resonance hybrid.

The electronic bonding of a single polyatomic species, including fractional bonds and fractional charges, is described by resonance structures, which are a collection of two or more Lewis structures.

There are three resonance configurations in sulfur trioxide. However, because all of the oxygen atoms in SO3 are equal, all of the structures are equivalent. Three oxygen atoms and one sulfur atom make up sulfur trioxide. With a bond angle of 120, sulphur is sp2 hybridized with a trigonal planar structure in SO3.

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None of the above.

Since none of the given option is a chemical property, rather all of them are physical method of separation and physical methods do not require a chemical change.

Solubility- It is a physical property because it is easily discernible through observation and does not alter the substance's chemical makeup. For instance, salt is still salt when it dissolves in water.

Evaporation - The chemical composition of a liquid does not change when it evaporates. The only alteration is a phase shift brought on by pressure and temperature. Evaporation, or the phase transition from liquid to gas, is a physical change as a result.

Filtration - Filtration is a physical separation procedure that uses a filter medium with a complicated structure that only allows fluid to pass through it to separate solid particles and liquid from a combination.

Therefore, neither new nor broken chemical bonds are created or broken during the separation. During the separation, bonds are severed or strengthened.

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In general, when two equivalents of an aldehyde react with NaOH, ethanol, and heat, they undergo a Cannizzaro reaction to form an alcohol and a carboxylic acid. The structure of the alcohol product depends on the identity of the aldehyde reactant.

The Cannizzaro reaction is a disproportionation reaction in which one aldehyde molecule is reduced to an alcohol, while another is oxidized to a carboxylic acid. The reaction is typically carried out in basic conditions to facilitate the deprotonation of the aldehyde and to promote the formation of the carboxylate ion intermediate. Ethanol is often used as a solvent to dissolve the reactants and products and to prevent the oxidation of the alcohol product. The reaction is exothermic and requires heat to proceed.

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Answer:

It’s the chemical change then a new substance is formed.

Explanation:

Answer:

the density of the cube is 0.8 grams per cubic centimeter.

Explanation:

To find the density of the cube, we need to know its volume as well as its mass. From problem #3, we know that the length of each side of the cube is 5 cm. Therefore, the volume of the cube is:

Volume = (side length)^3

Volume = 5^3 cm^3

Volume = 125 cm^3

Now that we know the volume of the cube, we can use the formula for density:

Density = Mass / Volume

We are given that the mass of the cube is 100 g. Substituting the values we get:

Density = 100 g / 125 cm^3

Simplifying, we get:

Density = 0.8 g/cm^3

Therefore, the density of the cube is 0.8 grams per cubic centimeter.

Answer:

Period

Explanation:

I believe your answer should be period.

I hope it helps! Sorry if it didn’t… Have a great day!

Layla~