1. In a purple camote peel soaked with rubbing alcohol overnight and steel wool vinegar supernatant liquid. What is the explanation of the reaction or result when you add 2 teaspoons of supernatant liquid in the purple camote peel extract soaked with rubbing alcohol?


2. In flower alcoholic extract, bougainvillea petal soaked with rubbing alcohol overnight. What is the explanation of the reaction or result when you add 2 teaspoons of supernatant liquid in the flower alcoholic extract?

There are 2.71*10^24 atoms of oxygen.

1st) It is necessary to calculate the amount of oxygen in 1.50mol of sodium carbonate (Na2CO3).

We know that 1 mole of sodium carbonate has 3 moles of oxygen, so to calculate the moles of Oxygen in 1.50 moles of Na2CO3 we can use a mathematical Rule of Three:

Now we know that there are 4.5 moles of oxygen in 1.50 moles of sodium carbonate.

2nd) Finally, we can calculate the atoms of oxygen using the Avogadro's number (6.022*10^23 atoms/mol):

So, there are 2.71*10^24 atoms of oxygen in 1.50 mol of sodium carbonate.

Answer:

3.2 moles of H2SO4

Explanation:

We need to start with a balanced equation.  Lets assume the sulfuric acid is formed from sulfur dioxide and water.

   SO2 + H2O = H2SO4

This equation is balanced.  (Check it)

It tells us that 1 mole of SO2 will form 1 mole of H2SO4, if the reaction proceeds as planned.  That's a molar ratio of 1 to 1.  They are equal.  What moles we react, we should expect the same number of moles of product.  [And we need 1 mole of water at the same time]

So if we react 3.20 moles of sulfur dioxide, and keep out lab partner back, we'll obtain 3.2 moles of H2SO4.

Wegener suggested that the deserts of Africa were once covered in ice and that the striations were formed by the movement of the ice across the desert floor.

Glacier striations are grooves or scratches in the bedrock that have been created by a glacier sliding over the surface. They are typically found in areas where the ice has melted away, revealing the bedrock beneath.

Wegener suggested that the deserts were once wetter and lusher. He proposed that the climate has gradually changed over time, making the deserts arider. This is supported by evidence of ancient riverbeds and lakes in the Sahara Desert.

Glacier striations can be used to help researchers learn about the history of a particular glacier and the climate in the area where it is located. For example, the direction of the striations can indicate the direction the glacier was moving and the depth of the striations can give clues about how deep the glacier was.

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Answer:

I believe it's qualitative and continuous.

Explanation:

Answer:

Continuous, and Quantitative

Hope this helps :)

Answer:

See explanation

Explanation:

If we look at the models, we will see that the three fluorine atoms in CF3COOH are attached to the carbon that is next to the -COOH group.

As a result of the electron withdrawing effect of the three fluorine atoms, CF3COOH  is much more acidic (104 times more acidic) than CH3COOH. This is reflected in the value of the Ka for each acid.

This electron withdrawing effect of the three fluorine atoms also stabilizes CF3COO- much more than CH3COO-.

The chemical that lies on alcohol group is alcohol with functional group'-OH'.

Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.

The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.

Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.

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Answer: 4.1 M

Explanation:

The brightest star in our sky is Sirius. We can infer so because it has the smallest apparent magnitude (most negative).

The correct option is (a) Sirius's dog collar

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The compound with the molecular formula \(C_9H_1_0O_2\) exhibits IR absorptions at 3091−2895 and 1743 cm−1, and 1H NMR signals at 2.06 (singlet, 3H), 5.08 (singlet, 2H), and 7.33 (broad singlet, 5H) ppm.

The given information describes the characteristics of a compound based on its molecular formula and spectroscopic data. The compound has a molecular formula of \(C_9H_1_0O_2\), indicating the presence of nine carbon atoms, ten hydrogen atoms, and two oxygen atoms. The IR absorptions at 3091−2895 cm−1 suggest the presence of C-H bonds (\(sp_3\) hybridized) in the compound. The absorption at 1743 cm−1 indicates the presence of a carbonyl group (C=O).

The 1H NMR signals provide additional insights. The singlet signal at 2.06 ppm corresponds to three hydrogen atoms (3H) that are likely attached to a methyl group (\(CH_3\)). The singlet signal at 5.08 ppm represents two hydrogen atoms (2H) attached to an unsaturated carbon (C=C). The broad singlet at 7.33 ppm suggests the presence of an aromatic system, with five hydrogen atoms (5H) attached to it.

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The reason why even the best vacuum pumps cannot lower the pressure in a container below 10−15atm is due to the fact that at this level, the pressure is considered to be in the ultra-high vacuum range.

Vacuum pumps work by removing gas molecules from a sealed container. However, as the pressure in the container decreases, the number of gas molecules present also decreases. At extremely low pressures, such as in the ultra-high vacuum range, there are so few gas molecules left that it becomes difficult to remove them.

The presence of residual gas molecules can also be caused by surface contamination, outgassing of materials in the container, or even the diffusion of gas through container walls. These factors can make it even more challenging to achieve a complete vacuum.

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Answer: download socratic for those type of answer it will give you GREAT ANSWERS !!

Explanation:

Answer:

Chemical potential energy being converted to kinetic energy

Explanation:

The balanced chemical equations are shown below:

1. Al (s) + 3HCI (aq) → AlCl3 (aq) + 3H2(g)

2. 2K (s) + 2H2O (1) → 2KOH (aq) + H2 (g)

3. 3Mg (s) + N2 (g) → Mg3N2 (s)

4. 2NaNO3 (s) → 2NaNO2 (s) + O2(g)

5. Ca(OH)2 (s) + 2H3PO4 (aq) → Ca3(PO4)2 (s) + 6H2O (1)

6. C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g)

7. 4NH3 (g) + 5O2 (g) → 4NO (g) + 6H2O (g)

8.  N2 (g) + 3H2 (g) → 2NH3 (g)

9. Na2CO3 (s) + 2HCI (aq) → 2NaCl (aq) + CO2 (g) + H2O (1)

10. C3H5OH (1) + 9O2 (g) → 3CO2 (g) + 4H2O (g)

11. 2NH3 (g) + 3CuO (s) → N2 (g) + 3Cu (s) + 3H2O (g)

Step 1. count the atoms on each side.

step 2. change the coefficient of one of the substances.

step 3.  count the numbers of atoms again and, from there,

step 4. repeat steps two and three until you have  balanced the equation.

A chemical equation is described as the symbolic representation of a chemical reaction in the form of symbols and chemical formulas.

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Answer:

The correct distance traveled by the train in 2 hours, if it travels at a speed of 100 km/h, would be 200 kilometers.

Explanation:

Answer:

traveled at a speed of 50mph

Explanation:

100/2 =50

The value of the bond angles in COH2 is 90 degrees.

Carbon dioxide and water molecules are examples of molecules that have bent geometries.

Explanation :

How do we determine the geometry of molecules?

The geometrical shape of a molecule depends on the number of electron pairs present on the central atom.

Here are the steps to determine the geometry of a molecule:

Step 1: Write the Lewis structure of the molecule.

Step 2: Identify the central atom of the molecule.

Step 3: Count the number of electron pairs (lone pairs and bonded pairs) around the central atom.

Step 4: Determine the electron pair arrangement by placing the electron pairs in positions with the maximum distance between them.

Step 5: Determine the molecular geometry by considering the positions of atoms only. The electron pairs are not considered in the molecular geometry.

Determine the molecular geometry of COH2:

Step 1: The Lewis structure of COH2 is shown below. There are two H atoms bonded to the O atom.

Step 2: The central atom in COH2 is oxygen (O).

Step 3: There are three electron pairs around O in COH2. One of the electron pairs is a lone pair and the other two electron pairs are bonding pairs.

Step 4: The electron pair geometry of COH2 is trigonal planar.

Step 5: The molecular geometry of COH2 is bent because of the lone pair of electrons on the O atom.

The bond angle in COH2 is approximately 109.5 degrees for the bonding pairs and approximately 120 degrees for the lone pair.

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When HCl is added to a solution containing Ag, Pb2, Hg22, Ca2, Mg2, and NH4 ions, some of these ions would form a precipitate. A precipitate is a solid substance that forms when two solutions are mixed.

The ions that would form a precipitate are those that have low solubility in water. Ag, Pb2, and Hg22 ions would form a precipitate when HCl is added to the solution. This is because these ions have low solubility in water and can combine with chloride ions to form insoluble compounds. Ag would form silver chloride (AgCl), Pb2 would form lead chloride (PbCl2), and Hg22 would form mercury (I) chloride (Hg2Cl2). On the other hand, Ca2, Mg2, and NH4 ions would not form a precipitate when HCl is added to the solution. This is because these ions are highly soluble in water and would not react with the chloride ions in HCl to form insoluble compounds.

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The mass of KF in the mixture is 1.067 grams

As per the details provided in the question are as follow,

Total weight of mixture (LiF+KF)= 5.08 grams

Mixture contains 3.26 grams of fluorine

Molar mass K = 39.10 g/mol

Molar mass F = 19.00 g/mol

Molar mass KF = 58.10 g/mol

Molar mass of lithium = 6.94 g/mol

mass of KF and LiF

Mass KF = X grams

Mass LiF = 5.08 -X grams

Now Calculate the moles

Moles KF = x grams / 58.10 g/mol

Moles LiF = (5.08-X grams) / 25.94 g/mol

1 mol of KF contains 1 mol of F atoms.

1 mol of LiF contains 1 mol of F atoms.

moles of F in KF= moles of KF= x/58.10 g/mol

moles of F in LiF = moles of LiF=  (5.08-x)/25.94g/mol

Total moles of Fluorine =(x/58.10)+((5.08-x)/25.94)

Calculate mass

The total weight of Fluorine in sample

3.26 grams =((x/58.10)+((5.08-x)/25.94))*19g/mol

x = 1.067 grams

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Answer:

1. Crush the sugar into powder.

2. Heat the water.

3. Dissolve it by stirring continuously

Explanation:

1. Crushing the sugar into powder increases surface area. So it increases the changes of dissolving

2. Heating the water increases the capacity of water to dissolve sugar.

3. Stirring continuously increases randomness of particles so eases mixing up thus increasing dissolving tendency.

Answer:

2000J

Explanation:

Given parameters:

Heat of fusion  = 80J/g

Mass of substance = 25g

Unknown:

Amount of energy required to melt the given mass = ?

Solution:

To solve this problem, the amount of energy required to melt the substance is given as;

             H  = m L

m is the mass

L is the heat of fusion

 Insert the given parameters and solve;

           H  = 25 x 80  = 2000J

Answer Choice: C

Explanation: Mendeleev is best known for publishing the first periodic table of elements in 1869, revolutionizing the world's understanding of physics and chemistry; and, really almost every aspect of science.

Answer:

Most similar   -----  Lithium

Least similar   ----  Nitrogen

Explanation:

Cesium is an element on the periodic with the atomic number 133. It lies in group 1 (i.e., the alkali metals) and period 6 on the periodic table. The oxidation state of group 1 metals is +1. Cesium forms an oxide with oxygen as  \(Cs_2O\).

The most similar compound to this chemical compound is Lithium because Lithium happens to be in the same group one metal with Cesium and forms the compound \(Li_2O\) with the oxygen

The least similar compound nitrogen due to fact that it is an oxide that is covalent in nature and lies between-group 3 -17  to form an \(NO_2\) with oxygen.

To determine how many grams of salt must be added to the salt solution, we need to first find the total mass of the product and then calculate the required amount of salt.

1. Convert the flow rate of unsalted soup from Lb/h to grams/hour (1 lb = 453.592 g)
  Flow rate (grams/h) = 110 lb/h * 453.592 g/lb = 49895.12 g/h
2. Calculate the mass of the final product with 1.5% salt by mass.
  Let x be the mass of the salt solution (grams) added.
  Total mass of the product = mass of unsalted soup + mass of salt solution
                                      = 49895.12 g/h + x g/h
3. Determine the mass of salt in the final product.
  Mass of salt in the product = 1.5% of the total mass
                                            = 0.015 * (49895.12 g/h + x g/h)
4. Calculate the mass of salt in the salt solution.
  Mass of salt in salt solution = 25% of the mass of the salt solution
                                             = 0.25 * x g/h
5. Set up an equation to equate the mass of salt in the final product and the mass of salt in the salt solution.
  0.015 * (49895.12 g/h + x g/h) = 0.25 * x g/h
6. Solve for x.
  748.4268 g/h + 0.015x = 0.25x
  0.235x = 748.4268 g/h
  x = 3182.66 g/h
3182.66 grams of salt solution must be added per hour to make a product containing 1.5% salt by mass.

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False

Atomic attributes are attributes that cannot be further divided. They are indivisible attributes that represent the smallest possible unit of information in a given context. For example, in a student record, the atomic attributes could be the student ID number, first name, last name, and date of birth.

In the context of database design, an attribute refers to a characteristic or property of an entity or object. Atomic attributes are those that are indivisible or cannot be further broken down into smaller components within the given context.

Atomicity is an important concept in database normalization, which is the process of organizing data in a database to eliminate redundancy and ensure data integrity. The first normal form (1NF) requires that each attribute in a relation (table) should hold only atomic values. This means that a single attribute should not contain multiple values or be composite in nature.

For example, let's consider a table representing employees in a company. The attribute "Name" would typically be atomic because it represents a single piece of information and cannot be further divided into smaller components within the given context. On the other hand, an attribute like "Address" might not be atomic since it can contain multiple elements such as street, city, state, and postal code.

By ensuring that attributes are atomic, it becomes easier to manipulate and query the data, maintain data consistency, and avoid data redundancy. It also helps in establishing a clear and well-defined structure for the database, making it easier to manage and analyze the data effectively.

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The  birth of lead from its ores involves several  way, including crushing and grinding the ore to a fine greasepaint, followed by a flotation process to separate lead- containing minerals from other  contaminations.  

The first step in  rooting  lead from its ore is to crush and grind the ore into a fine greasepaint. This increases the  face area of the ore, easing the  posterior chemical  responses.

The powdered ore is  also  subordinated to a flotation process, where specific chemicals are added to  produce a frothy admixture. The  head contains lead- containing minerals, which can be separated from the rest of the ore.  

The  head flotation process relies on the differences in  face  parcels of the minerals.

By widely attaching to the  face of the lead- containing minerals, the  head carries them to the  face, while the  contaminations sink to the bottom.

The  head is  also collected and further reused to  gain  supereminent concentrate.  

The  supereminent concentrate undergoes  fresh refining processes  similar as smelting and refining to  gain pure lead essence.

Smelting involves heating the concentrate with a reducing agent,  similar as coke or carbon, to separate the lead from other  factors. The molten lead is  also  meliorated by removing any remaining  contaminations.

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The extraction of lead from its ore includes several steps. The pyrometallurgical process, which involves heating the ore in a blast furnace, is the most commonly used method.

Here's an overview of the extraction process:

        2PbS + 3O2 → 2PbO + 2SO2

        The formed lead oxide (PbO) is then reduced further.

        a) Lead oxide reduction:

        PbO + C → Pb + CO

        b) Impurity removal: CaCO3 → CaO + CO2

        CaO + SiO2 → CaSiO3

Overall, the extraction of lead from its ore involves crushing, roasting, smelting, and refining steps to obtain pure lead metal.

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The question is -

Extraction of lead from its ore. Explain the process.

The empirical formula of a compound that is 68.42% Cr and 31.58% O will be CrO₂.

To determine the empirical formula, we first need to convert the percentage composition to mass.

For 68.42 g Cr per 100 g of compound, we have:

68.42 g Cr / 51.996 g/mol = 1.307 mol Cr

For 31.58 g O per 100 g of compound, we have:

31.58 g O / 16.00 g/mol = 1.974 mol O

To simplify the mole ratio, we divide both mole numbers by the smaller one:

1.307 mol Cr / 1.307 mol Cr = 1.000 mol Cr

1.974 mol O / 1.307 mol O = 1.509 mol O

So the empirical formula is CrO₂, where the subscripts are the rounded mole ratio.

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--The given question is incorrect, the correct question is

"Determine the empirical formula of a compound that is 68.42% Cr and 31.58% O by mass."--

The difference between those two is there is  a mol or mass ratios of the element in the composition and moll or mass ratio of compounds in the reaction at balanced equations.

Stoichiometry is an event of chemistry that happen using relationships between products and/or reactants in a certain chemical reaction to find out desired quantitative data. The word of stoichiometry based on Greek language, in Greek, "stoikhein" has a meaning "element" and "μέτρον" read as "metron" means "measure", so, based on its word definition, stoichiometry is a quantify of element.

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Answer:

The chemical compounds of living things are known as organic compound because of their association with organisms and because they are carbon-containing compounds, which are the compounds associated with life processes, are the subject matter of organic chemistry