What is the least number of electrons this atom must have in order to have a negative charge?

Answer:

The product of the reaction between calcium oxide (CaO) and water (H₂O) is calcium hydroxide (Ca(OH)₂), which is a solid.

Answer:

No, changes in matter are physical changes.

Explanation:

Firstly you need to know the composition of salt.

Salt is made of Sodium and Chloride and is ionically bonded.

Ionic bonding is a type of chemical bonding that involves electrostatic attractions between oppositely charged ions ( e.g Na+ and Cl-).

Therefore salt is bonded by ionic bond.

Answer:

Biuret test and the Ninhydrin test.

The biuret method is based on the fact that proteins (and, as a rule, all substances containing two or more peptidic bonds) react with copper to form a colored complex whose absorption (λmax=454 nm), in the presence of excess copper, is proportional to the amount of protein present.

Ninhydrin is a tricyclic 1,2,3-trione that acts as a reagent for amino acids. It's an organic chemical component that reveals hidden fingerprints on porous surfaces like paper, cardboard, and bare wood. Ninhydrin is a chemical that can be used to detect both primary and secondary amines.

Explanation:

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Answer:

Biuret Test:

The compounds with peptide linkage undergoes this test. Proteins are polypeptides of amino acids linked together by peptide bonds. An alkaline solution of protein is treated with a drop of aqueous copper sulfate when a bluish violet colour is obtained.

Laboratory Test of Proteins 01

This test can be used for the identification of proteins and also for protein estimation. Biuret is the chemical product formed when urea is heated to 180oC. In this reaction two molecules of urea condense to form a bi-urea or biuret molecule. Biuret reagent in the presence of copper ions forms a violet colour complex.

Note: Formation of violet colouration confirms the presence of Proteins.

(b) Xanthoproteic Test:

Proteins on treatment with nitric acid gives a yellow or orange colour. Concentrated nitric acid is used for nitration. On the treatment of nitric acid, proteins give yellow precipitate which turns to orange colour on treatment with alkali.

Laboratory Test of Proteins 02

Note: The appearance of yellow colour solution confirms the presence of proteins.

(c) Millon’s Test:

Phenolic group of tyrosine of proteins react with mercuric sulfate in the presence of sodium nitrite and sulfuric acid to give red colour. Millon’s test is given by proteins containing phenolic amino acids. Gelatin does not give this test. First white precipitate is formed when proteins treated with millon reagent and turns to brick red on boiling confirms the presence of proteins.

Laboratory Test of Proteins 03

Note: The appearance of brick red colour solution confirms the presence of proteins.

Answer:

\(\boxed {\boxed {\sf About \ 1.5 * 10^{24} \ atoms \ Si}}\)

Explanation:

When converting from moles to atoms, we must use Avogadro's number. This number tells us there are 6.022 * 10²³ atoms in 1 mole. We can multiply this number by the number of moles.

First, we must set up Avogadro's number as a ratio.

\(\frac {6.022 \ * 10^{23} \ atoms \ Si }{1 \ mol \ Si}}\)

Next, multiply the number of moles by the ratio.

\(2.5 \ mol \ Si *\frac {6.022 \ * 10^{23} \ atoms \ Si }{1 \ mol \ Si}}\)

When we multiply, the moles of silicon will cancel.

\(2.5 * \frac {6.022 \ * 10^{23} \ atoms \ Si }{1}}\)

Since the denominator of the fraction is 1, we can cancel it out too.

\(2.5 * {6.022 \ * 10^{23} \ atoms \ Si }\)

\(1.5055 * 10^{24} \ atoms \ Si\)

The original measurement (2.5 moles) has 2 significant figures (2 and 5). Therefore we must round to 2 sig figs. For this question, 2 sig figs is the tenth place.

The 0 in the hundredth place tells us to leave the 5 in the tenth place.

\(1.5 * 10^{24} \ atoms \ Si\)

There are about 1.5 * 10²⁴ atoms of silicon.

When chlorine gas is bubbled through an acidified solution of potassium permanganate, a chemical reaction occurs, resulting in the formation of chlorate ions as one of the products.

The potassium permanganate acts as an oxidizing agent, while the chlorine gas acts as a reducing agent. The acidified solution helps to facilitate the reaction by providing a suitable environment for the chemical reaction to take place. Chlorine gas is highly reactive and can undergo oxidation and reduction reactions, making it a useful chemical in many industrial applications. In this particular reaction, it reacts with the potassium permanganate to form chlorate ion, which has its own range of applications in various industries, including the manufacture of fertilizers, herbicides, and explosives. Overall, the reaction between chlorine gas and an acidified solution of potassium permanganate is a useful chemical process that has many industrial applications. It highlights the importance of understanding the properties of different chemicals and how they can be used in various processes to create new products.

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Answer:

The mass of 42.3 moles of potassium sulfate is 7,371.1557 grams

Explanation:

Potassium sulfate K₂SO₄ which is also known as sulphate of potash is a water soluble common component of fertilizer

The molar mass of potassium sulfate, M = 174.259 g/mol

The given number of moles of potassium sulfate, n = 42.3 moles

The mass, 'm', of a given number of moles of potassium sulfate, 'n', is given as follows;

m = n × M

Therefore, we have;

The mass, 'm', of 42.3 moles of potassium sulfate is found by plugging in the values for 'M', and 'n', in the above equation as follows;

m = 42.3 moles × 174.259 g/mol = 7,371.1557 grams

The mass of 42.3 moles of potassium sulfate, m = 7,371.1557 grams.

Billy will make about 1749.04 grams of calcium bromide, more than the amount needed by the instructor with the given 350 g of calcium.

When calcium is made to react with bromine by a particular amount in a beaker containing bromine gas, the equation of the reaction that occurs is as follows:

\(Ca + Br_2 --- > CaBr_2\)

From the equation, the mole ratio of calcium to the calcium bromide that is formed is 1:1.

Recall that: mole = mass/molar mass

The molar weight of calcium is 40 g/mol, thus, 350 g of calcium would be equivalent to:

Mole of 350 g calcium = 350/40 = 8.75 mol

The equivalent mole of calcium bromide formed will also be 8.75 mol. The molar mass of calcium bromide is 199.89 g/mol. Thus, the mass of 8.75 mol calcium bromide would be:

Mass = mole x molar mass

         = 8.75 x 199.89

         = 1749.04 grams

In other words, 1749.04 grams of calcium bromide would be formed from 350 grams of calcium. Granted that enough bromine is available, Billy will make more than enough calcium bromide needed by his instructor.

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2,2-dimethyl-1-bromopropane, a primary alkyl halide, reacts 100,000 times slower than ethyl bromide in an SN2 reaction because the former compound even though a primary alkyl halide has more stearic hindrance than the latter.

In SN2 reaction refers to a nucleophilic substitution reaction in which new bonds are formed and old bond gets broken simultaneously. It is a bimolecular reaction.

The reactivity of an alkyl halide SN2 reaction is as per the following pattern -methyl > 1° halide >  2° halide >  3° halide. This rule is due to an increase in stearic hindrance.

The reactivity of an alkyl halide SN2 reaction is as per the following pattern RF > RCl > RBr > RI. This rule is due to more electronegativity and hence easy addition of the halide ion.

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The kinds of the solids are;

SiO2 - Covalent network solid

C6H12O6 - Covalent solid

KI - Ionic solid

A covalent network solid, often referred to as a network covalent solid or just a network solid, is a category of solid material in which the atoms that make up the material are strongly covalently linked to one another, forming an extended three-dimensional network structure.

Covalent network solids are kept together by a dense network of covalent bonds, as opposed to molecular or ionic solids, which are held together by weaker intermolecular forces or ionic interactions, respectively.

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Atomic numbers

This is the answer

Answer:

Molecular mass of NH3 = ( 14 + 3 ) = 17 g

\(PV = \frac{m}{m _{r}} RT \\ P \times 50.0 \times {10}^{ - 6} = \frac{68.0}{17} \times 8.314 \times (30.0 + 273) \\ P = \frac{68.0 \times 8.314 \times 303}{17 \times 50.0 \times {10}^{ - 6} } \\ P = 2.02 \times {10}^{8} \: Pascals\)

The option B is correct. Brittle is the characteristic of a ionic compound.

An ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions.

Also, the properties of ionic compounds are as follows: crystalline solids, and are brittle in nature, high melting and boiling points, soluble in water and conduct electricity in their solution and molten states.

Hence, from all the options, brittle is the only characteristic of ionic compound.

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Hydraulic conductivity, also known as permeability, is a property of porous materials that describes their ability to transmit fluid (typically water) through them. The hydraulic conductivity (K) for the given parameters is approximately 0.1667 m/s.

It represents the ease with which water can flow through a saturated medium under a hydraulic gradient. Hydraulic conductivity is influenced by various factors such as the properties of the porous medium (e.g., particle size, shape, and arrangement), the fluid viscosity, and the pressure gradient. It is commonly expressed in units of velocity, such as meters per second (m/s) or centimeters per second (cm/s).

To calculate the hydraulic conductivity (K) using the given parameters, let's substitute the values into the equation:

\(K = (0.4 * 10^{-3}) / ((\pi * (0.085 / 2)^2) * (0.12 / 0.18))\)

First, we can simplify the expression inside the parentheses:

\(K = (0.4 * 10^{-3}) / ((\pi * (0.0425)^2) * (0.12 / 0.18))\\K = (0.4 * 10^{-3}) / ((\pi * 0.0018025) * (0.12 / 0.18))\\K = (0.4 * 10^{-3}) / (0.0035962 * 0.6667)\\K = (0.4 * 10^{-3}) / 0.0023975\\\\K = 0.1667 m/s\)

Therefore, the hydraulic conductivity (K) for the given parameters is approximately 0.1667 m/s.

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Answer:

324 meters

Explanation:

I don't really have an explanation

Answer:

magnification and resolution  

Explanation:

Two parameters are especially important in microscopy: magnification and resolution. Magnification is a measure of how much larger a microscope (or set of lenses within a microscope) causes an object to appear.

Answer:

5.40 moles ( to 3 signif digits )

Explanation:

ONE mole is Avagadro's Number   6.022 x 10^23  atoms/mole

3.25 x 10^24 atoms / (6.022 x10^23 atoms/mole ) = 5.396 moles ~ 5.40 moles

Answer:

iron

Explanation:

[Ar]4s23d2 is the noble gas notation for titanium.

The noble gas notation is a way of writing the electron configuration of an atom that uses the symbol for the nearest noble gas to represent the filled inner shells. In the case of titanium, the nearest noble gas is argon, which has an electron configuration of [Ar]3d104s2.

The electron configuration for titanium is then written as [Ar]4s23d2. This means that the titanium atom has the same electron configuration as argon, plus two electrons in the 4s subshell and two electrons in the 3d subshell.

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Answer:

the correct answer is argon: 1s 2^2s 2^2p 6^3s 2^3p^6​

Explanation:

Answer:

75% will have long legs and 25% will have short legs

Explanation:

Answer:

8.822 × 10¹³ g Co

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

9.015 × 10³⁵ atoms Co

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Co - 58.93 g/mol

Step 3: Convert

\(9.015 \cdot 10^{35} \ atoms \ Co(\frac{1 \ mol \ Co}{6.022 \cdot 10^{23} \ atoms \ Co} )(\frac{58.93 \ g \ Co}{1 \ mol \ Co} )\) = 8.82189 × 10¹³ g Co

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

8.82189 × 10¹³ g Co ≈ 8.822 × 10¹³ g Co

When preparing a plate, it is necessary to flame the metal loop between each step because it helps to kill any bacteria present. The metal loop is first heated in the flame until it is glowing red-hot.

This sterilizes it and burns off any organic matter that may be present. After that, the loop is allowed to cool for a few seconds to avoid killing any microbes in the sample. The loop is then used to transfer the inoculum from the source, such as a colony on an agar plate or a liquid culture, to the plate.

Once the inoculum is transferred, the loop is flamed again before being used for the next sample. This process is repeated for each sample to ensure that each one is not contaminated with the previous sample. It is also important to ensure that the loop is not too hot before touching the agar or culture, as this can kill the microbes and prevent them from growing.

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Answer:

A) Shaken is the correct answer

Explanation:

The other three don't fit in with the solution if you think about it. When you shake something with lemonade crystals (Like a lemonade flavor packet in poured in a water bottle) it dissolves faster when you shake it rather than it sit on the bottom for 15 minutes! :) .

Hope this helps! :)

Answer:

The Person above me is correct

Explanation:

I got it right first try 100%

Answer:

The correct answer to the following question will be Option A (Microwaves).

Explanation:

The other given choices are not related to the given circumstances. So that option A seems to be the appropriate one.

Answer:

its a

Explanation:

The two uses of dry ice include the following:

This is defined as a solid form of carbon dioxide and doesn't have a liquid state under normal atmospheric pressure. This is therefore the reason why it undergoes sublimation which involves the direct conversion of the solid phase to the gas phase.

Dry ice is used as a cooling agent in the preservation of substances via refrigeration etc and is also used in agriculture to speed up the growth of plants.

This is because plants need carbon dioxide for their photosynthetic activities and the aforementioned are therefore the appropriate uses of dry ice.

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Answer:

Every System has an IPO: Input, Process, Output. When you look at any system, in its simplest form, it has 3 components. It's what I'll call IPO: Input, Process, Output. Input – anything you do to activate the system or give the system to use.

Explanation:

The volume of NaOH needed to result in a solution with a pH of 9.8 is 500.0 mL. The correct option is d.

To determine the volume of NaOH needed to reach a solution pH of 9.8, we need to consider the dissociation of aspartic acid and the neutralization reaction between aspartic acid and sodium hydroxide.

Aspartic acid (H₂Asp) is a diprotic amino acid, meaning it can donate two protons. The dissociation reactions are as follows:

H₂Asp ⇌ H⁺ + HAsp⁻

HAsp⁻ ⇌ H⁺ + Asp²⁻

In the given solution, aspartic acid is fully protonated, so initially, all of it exists as H₂Asp. As sodium hydroxide (NaOH) is added, it reacts with the protons in the solution to form water and sodium aspartate.

H⁺ + OH⁻ → H₂O

Since the concentration of NaOH is given as 0.10 M, we can calculate the number of moles of OH⁻ required to neutralize the protons in the solution. This will help us determine the volume of NaOH needed.

The balanced neutralization equation is:

H₂Asp + 2NaOH → Na₂Asp + 2H₂O

From the stoichiometry of the reaction, we know that 2 moles of NaOH react with 1 mole of H₂Asp.

Initial volume of the aspartate solution (V_initial) = 100.0 mL = 0.100 L

Initial concentration of aspartate (C_initial) = 0.25 M

Concentration of NaOH (C_NaOH) = 0.10 M

Desired pH of the resulting solution = 9.8

First, let's calculate the number of moles of aspartate present in the initial solution:

n_initial = C_initial * V_initial

Next, let's determine the number of moles of OH- required to neutralize the protons:

n_OH = 2 * n_initial

Now we can calculate the volume of NaOH required:

V_NaOH = n_OH / C_NaOH

Substituting the values:

V_NaOH = (2 * C_initial * V_initial) / C_NaOH

V_NaOH = (2 * 0.25 * 0.100) / 0.10 = 0.500 L = 500.0 mL

Therefore, the volume of NaOH needed to result in a solution with a pH of 9.8 is 500.0 mL (option d).

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