Identify each substance based on its description. jake collected samples of two substances while he was out walking. after taking the samples home, he ran tests and found that one substance is slippery and conducts electricity in water. these properties made jake conclude that the substance is probably . the other substance continuously made bubbles of hydrogen gas when jake dropped magnesium into an aqueous solution of the substance. jake concluded that the second substance is probably .

Answer:

C

Explanation:

Divide 35.47 by the molar mass

5.87 g of nickel (Ni), is deposited when 0.2 faraday of electrical charge is transmitted through a solution of NiS\(O_{4}\).

The balanced Equation of nickel is :

Ni²⁺ + 2e —> Ni

The Molar mass of nickel is 59 g\(mol^{-1}\)

The Molar mass of Ni= 1×59=59 g\(mol^{-1}\)

Number of faraday =2                                      (∵ Nickel losses 2 electrons )

To Determine the mass of Ni deposited.

2 faraday deposits 59 g\(mol^{-1}\) of nickel.

To get 0.2 farad deposits what mass of nickel , we have,

2 farad = 59  g\(mol^{-1}\) of nickel

0.2 farad = ?

⇒\(\frac{(59 gmol^{-1} )(0.2 )}{2}\)

⇒5.87  g\(mol^{-1}\) ≈ 5.9 g \(mol^{-1}\)

Electroplating is essentially the hydrolysis-based plating of one metal onto another, either to stop corrosion of the metal or for ornamental purposes. In order to create a slim coherent metal coating on the electrode, the technique reduces dissolved metal cations using an electric current. When anions are electrically oxidized on a solid substrate, such as when silver chloride is formed on silver wire to create silver chloride electrodes, electroplating is frequently used.

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Answer:

c

Explanation:

just took the test 100 on it the test is simple machines

Answer:

The group that tests the variable.

Explanation:

The group that tests the variable is a control group.

Answer:

C when testing the group put the varible in control

Answer:

vines or body vessels

Explanation:

Veins are vessels of the circulatory system that support circulation by conveying blood to the heart. Blood flowing through the circulatory system transports nutrients, oxygen, and water to cells throughout the body.

Answer: Respiratory system.

Explanation: The cardiovascular system transports oxygen and carbon dioxide for the respiratory system. Not the best explanation but I hope this help ya, good luck! ;D

Since siderite has always had the chemical symbol feco3, it belongs to the carbonate class of rocks.

The atoms in each element of a compound is revealed by the molecular formula. It includes the symbols for the atoms of each element found in the compound, together with a tally of how many of each element there are overall in the shape of subscripts. Empirical, molecular, and structure chemical formulas are the three basic categories. The lowest whole-number ratio of the atoms in a compound has been shown by empirical formulae, the numbers of every form of atom in a molecule is shown by molecular formulas, and the bonds between the atoms or molecules are being shown by structural formulas.

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Answer:

animals

Explanation:

I think I remember this from a quiz I took so exotic species

Explanation:

sodium oxide + hydrochloric acid give us sodium chloride + water

In order to find the answer we need to set the equation up first, so the reaction for photosynthesis is:

6 CO2 + 6 H2O + energy -> C6H12O6 + 6 O2

Now by checking the molar ratio between water and glucose we see that for every 6 moles of H2O we will end up having 1 mol of C6H12O6, so we have a 6:1 molar ratio, now in order to produce 0.500 we will find out by doing the following calculation:

6 H2O = 1 C6H12O6

x H2O = 0.500 C6H12O6

x = 3.00 moles of H2O are needed to produce 0.500 moles of glucose

Answer:

3

Explanation:

The molarity of the solution that is 6.0% H₂O₂ by mass and has a density of 1.0 g/mL is approximately 1.67 M.

To calculate the molarity of the solution, we need to determine the number of moles of H₂O₂ present in 1 liter (or 1000 mL) of the solution.

First, we calculate the mass of H₂O₂ in 100 g of the solution:

Mass of H₂O₂ = 6.0% of 100 g = 6.0 g

Next, we calculate the number of moles of H₂O₂ using its molar mass:

Molar mass of H₂O₂ = 2(1.00784) + 2(15.999) = 34.0147 g/mol

Number of moles of H₂O₂ = Mass of H₂O₂ / Molar mass of H₂O₂ = 6.0 g / 34.0147 g/mol ≈ 0.1765 mol

Since the solution has a density of 1.0 g/mL, the mass of the solution in 1 liter is 1000 g.

Now, we can calculate the molarity:

Molarity (M) = Number of moles of solute / Volume of solution in liters

Molarity = 0.1765 mol / 1 L = 0.1765 M ≈ 1.67 M

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Explanation:

Making a salt from an alkali

If you are using an alkali - which is a soluble base - then you need to add just enough acid to make a neutral solution (check a small sample with universal indicator paper).

Warm the salt solution to evaporate the water. You get larger crystals if you evaporate the water slowly.

It is critical to develop a PheDH with specificity and high activity since it is crucial for the manufacture of chiral pharmacological intermediates and the detection of phenylketonuria.

Here, a PheDH gene, pdh, was discovered that encodes a novel BhPheDH with 61.0% similarity to the previously identified PheDH from Microbacterium sp. In comparison to the PheDH from Nocardia sp., the BhPheDH demonstrated superior stability in hot environments (40–70°C) and optimal activity at 60°C and pH 7.0. Additionally, sodium salt has the potential to greatly boost both its activity and thermostability. The residual activity of the BhPheDH was found to be 1.8-fold higher than that of the control group following incubation for 2 hours in 3 M NaCl at 60 °C (without NaCl).

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The example of always having rice available at every meal, passed down through generations, is an example of food selection based on cultural tradition and historical practices.

Food selection is influenced by various factors, including cultural traditions, historical practices, availability, and personal preferences. In this case, the consistent presence of rice in every meal within the family is an indication of food selection based on cultural tradition and historical practices. Rice has likely been a staple food in the family's culture for generations, and its inclusion in meals reflects the cultural significance and importance placed on rice as a dietary component.

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True. Do not use oil-based products such as Vaseline and body lotions because they destroy latex. Latex is a natural rubber, and when it comes into contact with oil-based products, it reacts chemically.

This reaction causes latex to degrade and lose its elasticity, making it prone to breakage. Therefore, it is important to avoid oil-based products when using latex products, such as condoms, gloves, and other medical supplies. Instead, use water-based products that are safe to use with latex. Water-based products are gentle on the skin and do not react chemically with latex, making them ideal for use with latex products.

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Answer:

ganar tres electrones

Explanation:

Answer:

gaining three electrons

The molarity of NaOH solution is 0.114 M.

Given, Mass of flask and vinegar solution= 25.17 g.Mass of flask= 15.12 gVolume of vinegar solution (in mL)= 10.00 mlInitial volume of NaOH (in mL)= 0.00 mlFinal volume of NaOH (in mL)= 39.00 mlThe Mass of vinegar solution is 10.0503 g.The volume of NaOH used in titration is 39.00 ml.Let's calculate the molarity of the NaOH solution.First, calculate the moles of NaOH used in the reaction. Moles of NaOH = Molarity × Volume of NaOH (in L) Converting volume in mL to L,Volume of NaOH used = 39.00 mL = 39.00/1000 L = 0.0390 LThe molarity of NaOH solution is given by;Molarity of NaOH = Moles of NaOH / Volume of vinegar solution (in L)Converting volume in mL to L,Volume of vinegar solution = 10.00 mL = 10.00/1000 L = 0.0100 LNow, substituting the values; Molarity of NaOH = 0.114 M.

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Answer:

i cant see the image im good at chem if you can write it down in the comments ill answer it

Explanation:

The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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In terms of increasing acidity, the protons can be ranked as follows: C < A < D. The proton on pOH (hydroxide ion) is the least acidic among the given molecules. NH3 (ammonia) has a proton that is more acidic than pOH. Finally, the proton on CH3 (methyl group) is the most acidic.

The acidity of a proton is determined by the stability of the resulting conjugate base after deprotonation. In this case, we are comparing the acidity of protons on four different molecules: pOH, NH3, NH2, and CH3.

The proton in molecule C is the least acidic. This is because C refers to pOH, which is a hydroxide ion with a proton attached to it. Hydroxide ions are strong bases and have a very low tendency to donate a proton. Therefore, the proton on pOH is the least acidic among the given molecules.

Moving on to molecule A, it refers to NH3, which is ammonia. Ammonia is a weak base and can donate a proton to a greater extent compared to hydroxide ions. Therefore, the proton on NH3 is more acidic than the proton on pOH.

Finally, molecule D refers to CH3, which is a methyl group. Methyl groups are non-acidic in nature as they lack a basic site or any resonance stabilization. Therefore, the proton on CH3 is the most acidic among the given molecules.

To summarize, in terms of increasing acidity, the protons can be ranked as follows: C < A < D. The pOH proton is the least acidic, followed by the NH3 proton, and the CH3 proton is the most acidic.

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Answer:

2.coefficient how many molecules of Aluminum hydroxide there are

The two compounds that will react to give an amide are propanoic acid and ammonia.

Amides are formed through the reaction of a carboxylic acid and an amine. In this case, propanoic acid is a carboxylic acid (with the formula \(CH_{3}CH_{2}COOH\)) and ammonia is an amine (with the formula \(NH_{3}\)).

When these two compounds react, they will undergo a condensation reaction where the -OH group from the carboxylic acid and a hydrogen atom from the amine are eliminated as water (\(H_{2}O\)), and a bond forms between the carbonyl carbon of the carboxylic acid and the nitrogen atom of the amine.

This results in the formation of an amide, specifically propionamide (\(CH_{3}CH_{2}COOH\)).
To form an amide, propanoic acid and ammonia are the correct reactants among the given choices.

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