How should a segregated heterogeneous material be sampled in order to construct a representative sample

Answer:

Number of protons

Explanation:

There are three sub atomic particles. These are;

- Protons

- Electrons

- Neutrons

Among these three particles, only one determines the identity of the element. This is the Protons. The number of protons which is also called the atomic number determines the identity of an element. For instance, atom with one proton is Hydrogen and n other element can have atomic number of one.

Answer: try 42.8

Explanation: you might have to round to 42.8 because of the significant  figures

Answer:

6.44 cups of ice

Explanation:

The ratio of the densities is simply the density of one divided by the density of the other: The density of ice to water is 0.92. Using the ratio, one can simply multiply the volume of the ice by 0.92, which is the conversion factor for the volume of ice to liquid water.

7 × 0.92 = 6.44

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Answer:

is there choices you have to pick from

Explanation:

or do you have to describe a covalent bond ?

Answer:

sharing of electron between two atoms

Explanation:

these electrons are simultaneously attracted by two atomic nuclei..covalent bond are formed when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.

Japan is working to change to sustainable energy sources that can replace non-renewable energy sources. Japan recognizes the importance of transitioning to renewable energy sources in order to mitigate the negative impacts of environmental disasters.

The country aims to reduce its reliance on fossil fuels, such as coal and oil, which contribute to air pollution and climate change. Renewable energy sources, including solar, wind, hydro, and geothermal power, offer a more sustainable and environmentally friendly alternative. These sources generate electricity without depleting natural resources and produce fewer greenhouse gas emissions. By embracing renewable energy, Japan can reduce its carbon footprint and promote a cleaner and more sustainable future.

Japan's shift towards sustainable energy sources is part of its broader strategy to address climate change and achieve its target of carbon neutrality by 2050. The government has implemented policies and incentives to encourage the development and adoption of renewable energy technologies. Investing in renewable energy not only helps reduce environmental risks but also promotes economic growth and energy security. Furthermore, transitioning to sustainable energy sources can create new job opportunities and stimulate innovation in the clean energy sector. To achieve their goals, Japan is also focusing on improving energy efficiency and promoting energy conservation.

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Answer:

C.same as [H+]

Explanation:

Autoionization of water is expressed as H+ * OH-  = Kc

The value of Kc is 1*10^-14. Now simply plug thus in and the value of given H+ to solve

(1*10^-7) * OH- = 1*10^-14

OH- = 1*10^-7

Thus, in this scenario, the H+ and OH- ions have same concentration and solution is said to be neutral.

The pH scale ranges from 0 to 14, with values below 7 considered acidic, 7 being neutral, and values above 7 being alkaline. Hair and scalp have a slightly acidic pH, and using a pH-balanced shampoo helps maintain the natural balance.

The characteristic that identifies a pH-balanced shampoo is having a pH level close to the natural pH level of the hair and scalp, which is around 4.5 to 5.5. Therefore, a pH-balanced shampoo will have a pH level in the acidic to neutral range, typically between 4.5 and 5.5, to avoid causing damage or disrupting the natural pH balance of the hair and scalp.

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A pH-balanced shampoo should have a pH between 4.5 and 5.5, contain mild acids or bases, and help to keep the hair and scalp's natural pH level balanced.

A pH-balanced shampoo is important because it prevents the scalp from becoming too dry or too oily. It ensures that the hair cuticle is closed, reducing frizz and improving shine. Using a pH-balanced shampoo can also help maintain the effectiveness of other hair products.

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Answer:

Below

Explanation:

2 H2  + O2  ====>      H20      you have 4 H's on L...need 4 on right so:

2H2  + O2 =====>  2 H2 O      Now H's are 'balanced' and a check of the O's  shows they are balanced too (two O's on each side)

Answer:

The diagr displays the "DIFFUSION" of oxygen from the red blood cells into the capillary to the body cells

The diagram showing the direction of oxygen transfer from red blood cells to body cells describes the process of diffusion.

Particles travel by a process called diffusion from a region of higher concentration to one of lower concentration. When it comes to oxygen transfer in the body, oxygen molecules flow through cell membranes from red blood cells, where their concentration is higher, into body cells, where it is less concentrated.

Active transport refers to the movement of particles against their concentration gradient, requiring energy input. Osmosis is the diffusion of water molecules across a selectively permeable membrane. Transpiration is the process of water movement through plants. These processes are not directly related to the transfer of oxygen from red blood cells to body cells.

Therefore, the correct option is diffusion.

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A catabolic pathway is a d) a set of reactions that release energy that can be used to drive cellular work

A catabolic pathway involves a series of reactions that break down complex molecules into simpler ones, releasing energy in the process. This energy is then utilized by the cell to perform various tasks. Option d correctly identifies a catabolic pathway as a set of reactions that release energy, which can be used to drive cellular work.

During catabolism, large molecules such as carbohydrates, proteins, and fats are broken down into smaller molecules like glucose, amino acids, and fatty acids.

These molecules are then further degraded through oxidation reactions, releasing energy in the form of ATP (adenosine triphosphate). ATP serves as the primary energy currency in cells, providing energy for various cellular processes.

By breaking down complex molecules and releasing energy, catabolic pathways enable cells to obtain the necessary energy to carry out essential functions like metabolism, growth, and movement. So d is correct option.

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Answer:

I don't have how to do that in numerical figures

The amount of iron, in grams, that is needed to completely react with 878.0 g of  \(Cl_2\) would be 460.392 grams

Iron (III) chloride is produced by reacting iron with chlorine as follows:

\(Fe + Cl_2 --- > FeCl_3\)

The balanced equation of the reaction goes thus:

\(2Fe + 3Cl_2 --- > 2FeCl_3\)

The mole ratio of iron to chlorine is 2:3.

Recall that: mole = mass/molar mass

Molar mass of \(Cl_2\) = 35.5 x 2

                             = 71 g/mol

Mole of 878.0 g  \(Cl_2\) = 878/71

                                 = 12.3662 moles

From the mole ratio, the equivalent mole of Fe from 12.3662 moles  \(Cl_2\) will be:

 12.3662 x 2/3 = 8.2441 moles

Mass of 8.2441 mole Fe = mole x molar mass

Molar mass of Fe = 55.845 g/mol

Mass of 8.2441 moles Fe = 8.2441 x 55.845

                                         = 460.392 grams

The numbers in the final multiplication operation have 5 significant figures each. Thus, the significant figure of the final answer will also be 5.

in other words, the amount of iron needed to completely react with 878.0 g of  \(Cl_2\) is 460.392 grams.

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The Ground state electronic configuration of  Cr2+:[Ar] 3d4, Cu2+: [Ar] 3d9, Co3+: [Ar] 3d6

Electronic configuration, sometimes referred to as electronic structure or electron configuration, is the arrangement of electrons in orbitals that surround an atomic nucleus.

1. Cr2+

Atomic no.of Chromium(Cr)=24  

a ground state Chromium's electronic structure is as follows: [Ar] 4s1 3d5 = 1s2 2s2 2p6 3s2 3p6

(Atomic no.of [Ar](argon) = 18)

so,ground state electronic configuration for Cr2+:

[Ar] 4s0 3d4 =[Ar] 3d4

so, ground state electronic configuration of Cr2+:

[Ar] 3d4

2. Cu2+

Atomic number of Copper(Cu)= 29

Ground state electronic configuration of Cu:

[Ar] 4s1 3d10

so, ground state electronic configuration of Cu2+:

[Ar] 4s0 3d9 = [Ar] 3d9

so,electronic configuration of Cu2+:

[Ar] 3d9

3.Co3+

Atomic number of Cobalt(Co)=27

Ground state electronic configuration of Co:

[Ar] 4s2 3d7

so,electronic configuration of Co3+:

[Ar] 4s0 3d6 = [Ar] 3d6

So,electronic configuration of Co3+:

[Ar] 3d6

Therefore the Ground state electronic configuration of

Cr2+:[Ar] 3d4, Cu2+: [Ar] 3d9, Co3+: [Ar] 3d6

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Answer:

Drop the egg as many times as you want on any floor, as log as it is an inch above your foot or less, it will not break.

Explanation:

If a building has 200 floors, and you go to the top, you are at the highest floor. If you drop it from 1 inch above your foot it will not break, moving to any other floor on the building, so long as you follow the rule it will not break.

Or you can use a boiled egg :P

The given concentration of Ba(OH)2 is 0.00075 M.

Using the following balanced chemical equation: Ba(OH)2 ⟶ Ba2+ + 2 OH-The number of moles of OH- ions formed is double the moles of Ba(OH)2 dissociated.

Thus, the concentration of OH- ions can be calculated as follows:[OH-] = 2 × [Ba(OH)2][OH-] = 2 × 0.00075 M = 0.0015 MNow, since Ba(OH)2 is a strong base, it dissociates completely to give two OH- ions.

Thus, [H+] can be calculated as follows:

Kw = [H+][OH-]Kw = (1.0 × 10-14)(at 25°C)1.0 × 10-14 = [H+](0.0015)[H+] = (1.0 × 10-14) / (0.0015)[H+] = 6.67 × 10-12 M

Therefore, the concentration of [OH-] is 0.0015 M and the concentration of [H+] is 6.67 × 10-12 M.

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The concentration of the diluted solution if 12.0mL of 6.0M NaOH is diluted to 100.00 mL is 0.72M.

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

The molarity or concentration of a diluted solution can be calculated using the following expression;

CaVa = CbVb

Where;

According to this question, 12.0mL of 6.0M NaOH is diluted to 100.00mL. The concentration of a diluted solution is calculated as follows:

12 × 6 = 100 × Cb

72 = 100Cb

Cb = 0.72M

Therefore, 0.72M is the concentration of the diluted solution.

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Give names to equations 1, 2, and 3.Equation 3.2 N2O (g) N2 (g) + 0.5 O2 (g) H = -81.6 kJEquation 2: NO (g) + 1/2 O2 (g) + (1/2) NO2 (g) = +56.55 kJ

Equation 1 states that N2 (g), O2 (g), 2NO (g), and H = +180.7 kJ.

See Equation of state for cosmological applications of this (cosmology). See Optimum control General technique for further information on how this idea is used in optimal control theory.An equation of state is a thermodynamic formula used in physics, chemistry, andthermodynamics to describe the state of matter under a particular set of physical parameters, such as pressure, volume, temperature, or internal energy.[1] The Helmholtz free energy is used to formulate the majority of current equations of state. The characteristics of pure substances and mixtures in their liquid, gaseous, and solid forms as well as the state of matter

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The compound that has ionic bonds is KBr (potassium bromide). Therefore the correct option is Option E.

Ionic bonds develop when two atoms with significantly differing electronegativities create a bond in which one atom (the metal) contributes electrons to the other atom (the non-metal). Potassium (K) is a metal in KBr, while bromine (Br) is a nonmetal. The electronegativity of K is low, whereas that of Br is high. When K and Br bond, K contributes its valence electron to Br, resulting in an ionic bond.

The other chemicals listed, on the other hand, have covalent bonding. When atoms with similar electronegativities share electrons in order to produce a more stable electron configuration, covalent bonds occur.

a. H2O has covalent bonds;

b. O2 contains covalent bonds; and

c. Ne is a noble gas that does not create bonds.

d. CO contains covalent bonds.

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In order to properly balance an equation, we need to make sure that the same amount of elements on the reactants side matches the number of elements on the products side, we can do that by increasing the number in front of each molecule, the so called stoichiometric coefficient. In the reaction from the question we can properly balance by adding the following stoichiometric coefficients

1. 2 H2 + O2 -> 2 HO2

2. FeCl2 + H2O -> FeO + 2 HCl

3. C4H8 + 6 O2 -> 4 CO2 + 4 H2O

4. ?

5. 2 NaOH + MgCl2 -> 2 NaCl + Mg(OH)2

Answer:

Carbon atoms each form four strong bonds. The bonds are covalent (atoms share electrons). This gives graphite its characteristic properties such as high melting and boiling points, good electrical conductivity, and softness. Use as pencil 'lead', as a lubricant in oil, furnace linings, electrodes, neutron moderators in nuclear power stations.

Diamond atoms each form three strong covalent bonds in the same layer and one weak bond to an atom in another layer.  Diamonds have a high level of hardness, thermal conductivity, and optical dispersion. It is used for jewellery, oil-well drills, abrasives and cutting tools.

Explanation:

Structure of Graphite and Diamond (attached below):

Answer:

An atom is the basic building block of matter. Anything that has a mass-- in other words, anything that occupies space--is composed of atoms.

Answer:

An atom is a particle of matter that uniquely defines achemical element.

Explanation:

this might help you

Answer:

Sulfur — S

calcium — Ca

carbon — C

silver — Ag

gold — Au

helium — He

hydrogen — H

should become easier for you to memorise them as you go on in life (meaning going up a grade… grade 7 to 8 to 9 to 10 until you reach college and whatnot)

Answer:

Sand has a melting point of 1550

Salt has a melting point of 1474

Copper Chloride has a melting point of 928.4

Sugar has a melting point of 366.8

Based on this information I am sure you can determine sugar has the lowest melting point

Answer:

Neon is a noble gas, it is monoatomic in nature, which implies that it has only one atom present. If we compare neon with water, water has three atoms present, two hydrogen atoms and one oxygen atom. Hence water stores more energy than neon because it is polyatomic and contains chemical bonds.

there an A B C D thing?

Explanation:

890

Answer: thrusters

Explanation: got it right

The equilibrium constant for the system at the given temperature is 1.1×10⁻⁵

Equilibrium constant for a given is defined as the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient

For example:

eB <=> cD

The equilibrium constant for the reaction above is given as

Ke = [D]^c / [B]^e

The equilibrium constant for the reaction reaction can be obtained as follow

Ke = [NO]² / [N₂][O₂]

Ke = [1.1×10⁻⁵]² / [6.4×10⁻³][1.7×10⁻³]

Ke = 1.1×10⁻⁵

Thus, the equilibrium constant for the reaction at the given temperature is 1.1×10⁻⁵

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Complete question

See attached photo

Answer:

it is ductile

Explanation:

i took the test

Answer:

b

Explanation:

the difference in energy between an electron in the third shell of a sulfur atom to the energy of an electron in the first shell of the same atom is greater due to the content loaded in the respective shells, in this case the electrons present.

The difference in energy between an electron in the third shell of a sulfur atom to the energy of an electron in the first shell of the same atom is due to the content loaded in each shell. Electrons in different shells have different amounts of energy. This energy difference is due to the differences in the potential energy of electrons located in each shell. The potential energy increases with increasing distance from the nucleus, so electrons in shells farther from the nucleus have more energy than those closer to the nucleus. In the case of sulfur, it has six electrons in the outermost shell or third shell, and this is the shell where the electrons interact most with their environment.

so the energy required to remove an electron from this shell is less than the energy required to remove an electron from the first shell or innermost shell.

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C. All the water would reach an equilibrium temperature and heat would stop flowing.

When hot and cold water are mixed together, heat flows from hotter to colder until both reach a common temperature. This is because the molecules in the hotter water have more kinetic energy than those in the colder water, and so they transfer some of their energy to the colder water until both have the same amount of energy. Eventually, all the water in the mixture will reach the same temperature, and heat transfer will stop. Therefore, the end result of mixing hot and cold water would be that all the water would reach an equilibrium temperature and heat would stop flowing.

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