do numbers 9) and 12) asap!! thanks you!!

8 valence electron are present in Neon .

The electrons in an atom's outermost shell, or energy level, are called valence electrons.

The amount of electrons an atom has in its outermost valence shell determines how it bonds with other atoms.

The Periodic Table groups together elements whose atoms have the same number of valence electrons for this reason.

Neon, with a Z=10, possesses eight valence electrons. Due to its closed-shell structure, neon is extremely difficult to oxidise and decrease.

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Its D - ensure that his conclusion is supported by evidence. Skepticism will help him remain objective towards the experiment and not become biased and believe that his finding is correct just because he worked on them.

Each molecule of water consists of one atom of oxygen and two atoms of hydrogen, so it has the chemical formula H2O. The arrangement of atoms in a water molecule, explains many of the water’s chemical properties. In each water molecule, the nucleus of the oxygen atom (with 8 positively charged protons) attracts electrons much more strongly than the hydrogen nuclei (with only one positively charged proton).

This results in a negative electrical charge near the oxygen atom (due to the "pull" of the negatively charged electrons toward the oxygen nucleus) and a positive electrical charge near the hydrogen atoms. A difference in electrical charge between different parts of a molecule is called polarity. A polar molecule is a molecule in which part of the molecule is positively charged and part of the molecule is negatively charged.

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Alkyl halides are also known as haloalkanes. Halogen atoms have replaced one or more hydrogen atoms in an alkane to form compounds known as alkyl halides (fluorine, chlorine, bromine, or iodine).

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Answer:

57 mph 91.73 kph

58 mph 93.34 kph

59 mph 94.95 kph

60 mph 96.56 kph

is the answer

Explanation:

The student can claim: We can’t know for sure whether or not the mass changed, but it seems reasonable to claim that the mass did not change, given that the ranges of uncertainty overlap.

Since the student used the same electronic balance with an uncertainty of 0.05g to measure the mass of the solution before and after chemical reaction, the conclusion is that the masses are the same within the uncertainty of the balance.

+- value is uncertainty value of measurement.

Accuracy is the closeness of a measurement to the true value.

Balance is an instrument for comparing the mass of two bodies.

The percent error is an error between an observed value and the true value of a measurement.

Percent Error = (Actual Value - Estimated Value / Actual Value) × 100%

There are three types of error in chemistry: gross errors, random errors and systematic errors.

Missing options:

The mass definitely stayed the same because the measurement of 50.25 g was obtained each time.

The mass definitely stayed the same because the ranges of uncertainty overlap exactly.

We can’t know for sure whether or not the mass changed, but it seems reasonable to claim that the mass did not change, given that the ranges of uncertainty overlap.

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The amount of sodium hydroxide required to complete the reaction is 0.005 moles.

Mole can be defined as a standard scientific unit for measuring large qualities of very small entities such as atom , molecules etc,

Moles can be calculated as mass of substance divided by mass of one mole.

1cm3 = 0.001 dm3

20cm3 = 0.02 dm3

To calculate amount of mole of sodium hydroxide first we have to calculate mass of tatraoxosulphate.

Molarity = mass/ volume

Mass = molarity x volume = 0.125 x 0.02 = 0.0025

2NaOH + H2SO4 -> Na2SO4 + 2H2O

Amount of moles of NaOH  = 2 x mass of tatraoxosulphate

                                              = 2 x 0.0025 = 0.005 moles

Thus, the amount of sodium hydroxide required to complete the reaction is 0.005 moles.

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Answer:

it will be 60 day

Explanation:

2CH3OH()+302(g) → 2C02(g) + 4H₂O(l) is the reaction which shows a chemical change producing a gas.

One or more chemicals change into one or more other chemicals in a chemical reaction. A chemical reaction is the transformation of one or more substances, known as reactants, into one or more new substances, known as products. Chemical components or compounds make up substances. For instance, rust is created when iron and oxygen combine. When vinegar and baking soda are combined, sodium acetate, carbon dioxide, and water are the results. things igniting or detonating.

There are five types of chemical reaction that occur generally, they are

Single displacement, double displacement, combustion, combination or synthesis, and decomposition.

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Objective: To compare the efficacy of topical minoxidil 5% alone and combined topical minoxidil 5% and fractional laser in the treatment of male androgenic alopecia and detection of any side effects occurring with each line of treatment.

Patients and Methods: This prospective randomized comparative controlled study was conducted for one year on 40 patients with male androgenic alopecia attending our Patient. Patients were classified into two groups: Group A received minoxidil alone (minoxidil group) and group B where patients received minoxidil plus fractional CO2 laser.

Results: In groups A and B, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month (p<0.001). Also, there was a statistically significant improvement between the clinical assessment scale after 1 month and after 3 months (p=0.002). In group A, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month, however, there was no statistically significant improvement between the clinical assessment scale and after 3 months. In group B, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month, however, also, there was a statistically significant improvement between the clinical assessment scale and after 3 months.

Conclusion: Our study revealed the superiority of combination therapy, using a fractional laser and 5% minoxidil, over 5% minoxidil alone, for the treatment of male AGA, with no serious adverse effects of treatment identified.

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Answer:

Mixture because it isn't chemically combined

The amount of each type required to yield a mixture containing the pounds of nitrogen, pounds of phosphoric acid, and pounds of potash is y = 5 bags, x = 3 bags.

Fertilizers are any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients.

177 pounds = 29x + 18y (1)

Where x is bags of Vigor Ultra Turf fertilizer and y are bags of  Parkers Premium Starte-

For P₂O₅:

134 pounds = 3x + 25y (2)

For K₂O:

42 pounds = 4x + 6y (3)

Replacing (1) in (2):

134 = (531/29 - 54y/29) + 25y

3355/29 = 671y/29

Thus, y = 5 bags, x = 3 bags.

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Answer:

step 1- wash the rice cooker

step2-

The periodic table is an arrangement of the elements in order of increasing reactivity. The elements that are more reactive are found at the left hand side of the table among the metals. The reactive non metals are found at the right hand side of the table.

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Answer:

AlI3

Ag2O

k3N

Ca3(PO4)2

MgF2

Carrier proteins serve many purposes in the purposes in the attempt to move molecules across a plasma membrane.

Carrier proteins are proteins which are found n the surfaces of cell membranes which serve the function of transporting molecules across the cell membrane barrier.

The carrier proteins transport various molecules across the cell membrane.

Carrier proteins transport such molecules as sugars, proteins, ions, lipids across the membrane.

Some carrier proteins expend energy in the form of ATP when they transport molecules across the cell membrane.

Some use the concentration gradient of cells to transport molecules across the cell membrane.

The carrier proteins which expend energy to transport molecules are involved in active transport.

The carrier proteins that do not expend energy are involved in passive transport.

In conclusion, carrier proteins are essential in the transport of molecules across the plasma membrane.

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Answer:

(a) protons: 11 electrons:11

(b) protons: 56 electrons: 54

(c) protons: 8 electrons: 10

(d) protons: 27 electrons: 24

Explanation:

These solutions used to calibrate a pH meter are known as pH buffer.

A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H⁺ in a solution.

Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.

pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity of an aqueous solution:

When pH is less than seven (pH<7), solution is acidic.

When is equal seven (pH = 7), solution is neutral.

When pH is greater than seven (pH > 7), solution is basic.

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Filtration is useful for separating solids from liquids or gases compounds (option A).

Filtration is the act or process of filtering or in chemistry, it is the mechanical separation of a liquid from the undissolved particles floating in it.

Filtration is a common separation technique employed in chemistry for the partitioning of an undissolved solid from a liquid solvent.

For example; when a mixture of sand and water is filtered, the sand stays behind in the filter paper as the residue while the water passes through the filter paper to become the filtrate.

Therefore, it can be said that filtration is useful for separating solids from liquids or gases compounds.

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Answer:

Solids from liquids or gases

Explanation:

Connexus

Answer:

The last option. Because it's not a curate or precise on the dot.

Answer:

pour the rock salt mixture through a filter made from paper and allow the liquid to filtrate

Explanation:

Separating Sand and Salt

Probably the easiest method to separate the two substances is to dissolve salt in water, pour the liquid away from the sand, and then evaporate the water to recover the salt.

Isotope of phosphorus containing 19 neutrons can represented as ²⁴₁₅P.

Isotopes are those atoms of the same elements that have same number of protons or same atomic number but different mass  number.

Atomic number = number of protons in the atom = number of electrons in the neutral atom

Mass number = number of protons + number of neutrons

Mass number is represented as Z

Atomic number is represented as A.

While writing the symbol of an atom the mass number is written on the left and side and as a superscript to the symbol of the atom and atomic number is written to the left and as a subscript to the symbol.

Answer:

A the strong bonds between particles.

Explanation:

this is because in solids we say that they have a weak boling point due to the strong bond that makes it hard to melt

Answer:

Helping Hand Organization

Answer:

ok so what is the question?

2.020 × 10⁻²⁵ has four significant figures and 5.00  × 10²⁷ has three significant figures; correct option is A.

Significant figures are ways of expressing numbers in approximations such that the number of digits which are considered significant in a given number is stated.

Significant figures are used in approximation of numbers.

Some rules for determining significant figures are given below:

From the above rules:

2.020 × 10⁻²⁵ has four significant figures.

5.00  × 10²⁷ has three significant figures.

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As ,in diagram D we can see that there are only one type of atoms are joined, so they are pure substances. The particle of diagrams that represent a pure substance is Option D.

The substance which is made up of only one kind of particle and cannot be separated into other kind of matter is called Pure substance.

Example: Gold metal, sugar, salt, copper wire, diamond etc.

These substance are of two types

So, we are going to find out the pure substance from the below diagrams.  All other are mixtures having different kind of element.

Thus from the above conclusion we can say that the option D represents pure substance.

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While burning coal and charcoal, you notice that coal releases more heat than charcoal. This means that the chemical potential energy in coal is higher than that of charcoal.

Combustion or burning occurs when a substance reacts with oxygen. This reaction is highly exothermic and releases high amounts of energy in the form of heat, light and sound. The amount of energy released depends on the potential chemical energy stored in the substance.

Potential chemical energy is the energy stored in a combustible substance that gets converted to heat, light and sound energy while the substance burns. The more potential chemical energy a substance has, the more energy it expels while burning.

Hence, while burning coal and charcoal, coal will release more heat energy because its potential chemical energy is higher than that of charcoal.

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No, hurricane won't loose strength when the winds are strong.

It's because If wind conditions are okay, the storm becomes a hurricane. This heat energy is the energy for the storm. And the warmer the water, the further humidity is in the air. And that could mean bigger and stronger hurricanes.

Hurricanes increases their speed their strength because Warmer ocean face temperatures consolidate tropical storm wind pets.

These are the top 3 factors for hurricane development

Warm ocean water

Wind shear

humidity content

If hurricanes snappily lose strength as they move over land it's only because of the Friction with Land.

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