A 282. 8 g sample of copper releases 175. 1 calories of heat. The specific heat capacity of copper is 0. 092 cal/(g·°C). By how much did the temperature of this sample change, in degrees Celsius?

Answer:

Percent yield = 85.23%

Explanation:

Given data:

Theoretical yield = 7.99 g

Actual yield = 6.81 g

Percent yield of CaO = ?

Solution:

Formula:

Percent yield = ( actual yield / theoretical yield ) × 100

by putting values,

Percent yield = (6.81 g/ 7.99 g) × 100

Percent yield = 0.8523× 100

Percent yield = 85.23%

To convert oxygen gas to solid, we need to continuous withdrawal of heat from the gas by cooling.

Matter is composed of particles and these particles that compose matter are always in constant motion. This is the main thrust of the so called Kinetic Theory of Matter.

Now we know that the particles that compose a solid are held in a fixed position thus they spread out or expand when heated. The particles of a liquid tend not to be held in fixed positions thus they can be poured.

Given that oxygen has a boiling point of -219°C and a freezing point of -183°C, it follows that at 0°C is a gas and at -200°C, oxygen is a liquid.

To convert oxygen gas to solid, we need to continuous withdrawal of heat from the gas by cooling.

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A) The concentration (in M) of the unknown NaOH solution in the first case is approximately 0.195 M.

B) The concentration (in M) of the unknown NaOH solution in the second case is approximately 0.05704 M.

C) The concentration (in M) of the unknown NaOH solution in the third case is approximately 0.0648 M.

D) The concentration (in M) of the unknown NaOH solution in the fourth case is approximately 0.1746 M.

Part A:

To calculate the concentration (in M) of the unknown NaOH solution in the first case, we have to use the balanced chemical equation:

NaOH + HCl → NaCl + H2O

From the equation, we know that the amount of moles of NaOH and HCl reacting are equal.

Molarity of HCl solution = [HCl] = 0.1599 M

Moles of HCl used = [HCl] × Volume of HCl used (in L)

= 0.1599 × 9.77/1000

= 0.0015618 mol

Since NaOH and HCl react in a 1:1 mole ratio,

Moles of NaOH used = 0.0015618 mol

Volume of NaOH used = 8.00 mL = 0.00800 L

Therefore, the concentration (in M) of the unknown NaOH solution in the first case = Number of moles of NaOH / Volume of NaOH solution

= 0.0015618 / 0.00800

= 0.195225

≈ 0.195 M (rounded to three significant figures)

Hence, the concentration (in M) of the unknown NaOH solution in the first case is approximately 0.195 M.

Part B:

Molarity of HCl solution = [HCl] = 0.1211 M

Moles of HCl used = [HCl] × Volume of HCl used (in L)

= 0.1211 × 10.34/1000

= 0.0012528 mol

Since NaOH and HCl react in a 1:1 mole ratio,

Moles of NaOH used = 0.0012528 mol

Volume of NaOH used = 22.00 mL = 0.02200 L

Therefore, the concentration (in M) of the unknown NaOH solution in the second case = Number of moles of NaOH / Volume of NaOH solution

= 0.0012528 / 0.02200

= 0.0570363636

≈ 0.05704 M (rounded to four significant figures)

Hence, the concentration (in M) of the unknown NaOH solution in the second case is approximately 0.05704 M.

Part C:

Molarity of HCl solution = [HCl] = 0.0889 M

Moles of HCl used = [HCl] × Volume of HCl used (in L)

= 0.0889 × 10.95/1000

= 0.000972255 mol

Since NaOH and HCl react in a 1:1 mole ratio,

Moles of NaOH used = 0.000972255 mol

Volume of NaOH used = 15.00 mL = 0.01500 L

Therefore, the concentration (in M) of the unknown NaOH solution in the third case = Number of moles of NaOH / Volume of NaOH solution

= 0.000972255 / 0.01500

= 0.064817

≈ 0.0648 M (rounded to three significant figures)

Hence, the concentration (in M) of the unknown NaOH solution in the third case is approximately 0.0648 M.

Part D:

Molarity of HCl solution = [HCl] = 0.1421 M

Moles of HCl used = [HCl] × Volume of HCl used (in L)

= 0.1421 × 39.18/1000

= 0.005586318 mol

Since NaOH and HCl react in a 1:1 mole ratio,

Moles of NaOH used = 0.005586318 mol

Volume of NaOH used = 32.00 mL = 0.03200 L

Therefore, the concentration (in M) of the unknown NaOH solution in the fourth case = Number of moles of NaOH / Volume of NaOH solution

= 0.005586318 / 0.03200

= 0.1745711875

≈ 0.1746 M (rounded to four significant figures)

Hence, the concentration (in M) of the unknown NaOH solution in the fourth case is approximately 0.1746 M.

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Answer:

The direction of prevailing winds determines which type of air mass generally moves over an area. For illustration, a west wind might bring warm wettish air from over an ocean. An east wind might bring cold dry air from over a mountain range. Which wind prevails has a big effect on the climate

Prevailing winds are the result of atmospheric rotation cells. They impact the climate of a region.

Rising and sinking air can impact the rush of a region.

Atmospheric rotation cells produce the general climate of a region.

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The definite crystalline structure of a mineral consist of the atoms in the mineral are arranged in regular geometric patterns that repeat.

We know that the crystal structure is fundamental to any mineral. This is a regular structure where we can see the arrangement of the atoms or the ions that make up the mineral. We have to recall that most of the mineral are ionic substances as such they has a regular repeating unit of the ions that does make up the mineral.

Now, each of the structures do have a definite pattern. The pattern that the crystal structure of the mineral has can be used to identify the mineral and it has a lot to do with the chemistry of the mineral that is under study. Thus all the minerals that we know do fall into one geometric pattern or the other.

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Answer:

108

Explanation:

Correct on edg2020

Answer:

108

Explanation:

1.84 mol NaCl  times 58.44 g NaCl all over 1 mol NaCl= 108g NaCl.

The Mol NaCl from the 108 cancles the mol NaCl from the one, leaving the 58.44 g mol NaCl.

1.84 times 58.44 g NaCl= 107.5=108

If one does not observe any difference in the TLC after 20 minutes, it shows that the reaction was not carried out or did not take place.  In such a case, one should repeat the reaction under optimal conditions.

In such a case, you should consider rechecking the reaction or the analytical technique used. This situation suggests that the reaction may be unsuccessful due to a technical issue such as failure to provide necessary conditions for the reaction to occur. It may also imply that the reaction being analyzed did not undergo any significant transformation, hence no difference was observed.

One can solve this problem by changing the solvent and considering the pH of the solution to provide optimal conditions for the reaction to occur. A more sensitive analytical method could also be employed to detect small changes or differences. The primary cause of the orange color is impurities present in the product, which are subsequently reduced to form the final product through sodium bisulfite treatment. When cooled, if no crystals form, it indicates that the product did not form, and the reaction did not take place.

This can result from an incorrect ratio of reactants, the purity of reagents, or incorrect reaction conditions. In such a case, one should repeat the reaction under optimal conditions.

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Answer:

C) Chalk powder

Explanation:

that's why it's often used in gymnastics ~~sweaty hands yk

Answer:

Water

Explanation:

hydrogen + oxygen = water

Answer:

22.5%

Explanation

% composition = Molar mass of S

------------------------ x 100

Molar mass of Na2SO4

= 32.065

------------ x 100

142

=0.225 x 100

= 22.5%

The chemical reaction between benzoic acid (C₆H₅COOH) and NaOH can be represented as C₆H₅COOH + NaOH → C₆H₅COONa + H₂O.

This reaction involves the displacement of the hydrogen atom from the carboxylic acid group in benzoic acid by the sodium atom from sodium hydroxide. As a result, sodium benzoate (C₆H₅COONa) and water (H₂O) are formed.

The reaction between benzoic acid and NaOH is classified as an acid-base reaction, where the acidic benzoic acid reacts with the basic NaOH to produce a salt (sodium benzoate) and water.

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Answer:

heyy dear...will you be my friend

Answer:

its because gas doesn't have a form but water does

The correct answer is e.

Atoms are made up of protons, electrons, and neutrons. This statement was not a basic assumption of Dalton's atomic theory. Dalton's atomic theory, proposed by John Dalton in the early 19th century, included the following basic assumptions:

a. Atoms of different elements differ in their weights: Dalton recognized that atoms of different elements have different masses.

b. All molecules of a compound have the same ratio of combining atoms: Dalton's theory emphasized that compounds are formed by the combination of atoms in fixed ratios, which led to the concept of the law of definite proportions.

c. All elements are made up of atoms: Dalton postulated that all elements are composed of tiny, indivisible particles called atoms.

d. Atoms combine to form molecules: Dalton proposed that atoms combine with each other to form molecules or compounds. This idea laid the foundation for the law of multiple proportions.

However, Dalton's atomic theory did not include the knowledge about subatomic particles such as protons, electrons, and neutrons. The existence and understanding of these particles came about later in the 20th century through the work of various scientists.

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The phenomenon when the partial positive and negative charges of water molecules are attracted to the negative and positive charges is called hydrogen bonding.

Hydrogen bonding occurs when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another. This creates an electrostatic bond between the molecules and results in a stronger intermolecular force than other dipole-dipole attractions.

As a result, hydrogen bonding is the strongest intermolecular force and is responsible for many of the physical and chemical properties of water, such as its high boiling point and surface tension.

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Somebody claims to have developed a new reversible heat-engine cycle that has a higher theoretical efficiency than the Carnot cycle operating between the same temperature limits. This evaluates that this heat engine is less efficient.

The Carnot's cycle is an ideal cycle for all heat engine which operates between the same temperature. It is a reversible cycle which have all process reversible that is why it have maximum efficiency.

On the other hand, the new reversible heat engine is a practical working cycle so it is impossible to make all process reversible . Practically,  there will be always loss of energy due to this any process can not be 100 % reversible. That is why the new reversible heat-engine cycle have low efficiency as compared to Carnot cycle operating between same temperature limits.

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The given reaction represents a combustion reaction.

In this reaction, the hydrocarbon compound C6H14 reacts with oxygen gas (O2) to form carbon dioxide gas (CO2) and water vapor (H2O). The reactants are a hydrocarbon and oxygen, and the products are carbon dioxide and water.

Combustion reactions are exothermic reactions that involve the reaction of a fuel with oxygen, resulting in the release of heat and light energy.

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Answer:

Explanation:

When rocks, land formations and minerals begin to break down and dissolve, it's called weathering. After crumbling, the process of erosion transports these broken bits away by wind or rain. Agents responsible for weathering include ice, salts, water, wind and plants and animals.

Answer:

A.

The hotter the object the faster the molecules so if the temperature is doubled the molecules go two times faster making the pressure double. Since the molecules are two times faster the pressure will be two times more because it is two times harder to keep the gas in.

Hope this helps

Explanation:

Answer:

jouls

Explanation:

it is joules because I payed attention in class

According to the concept of solubility, thing which dissolves is solute and in which it is dissolved is solvent , hence juice crystals are solute and water is solvent.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Answer:

Separating the nails is so easy because some are attracted to a magnet and some are not also you could pick them out by hand and separate them.

Explanation:

I hope this helps

your welcome :)

Answer:

B

Explanation:

Answer:

C

Explanation:

view the Attached photo i added to see how i got that answer

The reagents necessary to carry out the following conversion are:

A component or combination given to a system to initiate or test a chemical reaction is known as a reagent. The binding of reagents to a material or other related chemicals can cause certain reactions, which can be used to assess if a chemical compound is present or absent.

We need to do SN₂ reaction  two times so that we get same stereochemistry ,

Hence first NaBr  ,  Br- replaces OTS and Br will be solid line ( inversion happens in SN₂)

second CH₃NH₂ ,  NHCH₃  replaces Br-  and NHCH₃ will be in dashed line.

Small organic molecules or inorganic compounds make up the majority of reagents in organic chemistry. Cell lines, oligomers, monoclonal and polyclonal antibodies, and others are utilised as reagents in biotechnology. In analytical chemistry, they are widely employed as colour markers. Reagents include the Grignard reagent, Tollens reagent, Fehling reagent, Millon reagent, Collins reagent, and Fenton reagent. But not every reagent's name begins with the word "reagent." Solvents, enzymes, and catalysts are some examples of reagents.

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Complete question:

choose the reagents necessary to carry out the following conversion. select all that apply.

CH₃OH

CH₃NH₂

H₂O

HBr

NaBr

CH₃COONa

HN₃

Answer:

C

Explanation:

 i hope i helped you and have a nice day...