Perform the followingmathematical operation, andreport the answer to thecorrect number of significantfigures.9.635 ÷ 12.9 = [?]

The image is an isotope of Lithium because the number of neutrons differs between the two atoms and the protons remains the same.

Isotopes are members of an element family that have the same number of protons but differ in the number of neutrons. Carbon-12, carbon-13, and carbon-14, for example, are three isotopes of the element carbon with mass numbers 12, 13, and 14, respectively.

In the image, both the atoms are of Lithium and in both the cases, the number of neutrons differs whereas the number of protons and electrons are the same. Lithium has two stable isotopes, Li-6 and Li-7, with the latter accounting for 92.5% of the element. Nuclear and biomedical scientists are also interested in lithium isotopes. The use of Li as a shielding material in nuclear reactors is one nuclear application.

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2.2387×10⁻⁵ M is the concentration of  hydronium ion in a solution of HCL that has a ph of 4.65.

The term "hydronium" refers to the sort of oxonium ion created by protonating water, the aqueous cation H3O+. When an Arrhenius acid is dissolved in water, it is frequently thought of as the positive ion present since the surrounding water molecules get a proton from the Arrhenius acid molecules.

Hence, 2.2387×10⁻⁵ M is the concentration of  hydronium ion in a solution of HCL that has a ph of 4.65.

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ANSWER

The addition of HCl will shift to reactants

EXPLANATION

When some strong acid is added to a buffer, the equilibrium is shifted to the left, and the hydrogen ion concentration increases by less than expected for the amount of strong acid added. Buffer solution helps in adjusting the pH of a substance.

Since the HCl is a strong acid, it will shift to the left (reactant sides)

The purple solid salt that has a mass of 240 grams is the hydrated salt.

Hydrated salts are salts that contain water molecules in their crystals. These water molecules are known as the water of crystallization.

The water of crystallization in salt is the number of moles of water that combines with one mole of a given salt.

Hydrated salts usually weigh more than salts that are not hydrated.

Also, in some salts, a combination with water in their crystals results in the formation of salt that is colored.

Salts that are hydrated can lose some or all of their water of crystallization when they are heated.

Considering the two salts given:

two one-mole samples of a substance in its solid state; The purple solid has a mass of 240 grams, while the blue solid has a mass of 130 grams.

The heavier salt will definitely be the hydrated salt.

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Answer:

it's D for sure

Explanation:

don't forget to follow rate like

The amount of mass potassium hydroxide (KOH) required to react with every 1.25 g of aluminum is 2.58 g.

The amount of mass potassium hydroxide (KOH) required can be calculate as follow:

as we know;

Mass of pure aluminum = 1.25g

Molar mass of KOH = 56 g/mol

The chemical reaction of a given element is given by:

[tex]2Al + 2 KOH + 6H_2O = > 2K^{+} +2Al(OH)^{4-} +3 H^{+}[/tex]

From the above reaction, we can deduce that:

2 mol AL ----- 2 mol KOH

How many moles of aluminum are needed for 1.25g?

[tex]n Al =\frac{ g}{mw} \\n Al =\frac{ 1.25}{27}\\nAl = 0.046 moles[/tex]

The mass of KOH required for 0.046 moles of aluminum is calculated as:

Mass Required = 0.046 x 56

Required mass = 2.58 g

Therefore, the amount of mass potassium hydroxide (KOH) required to react with every 1.25 g of aluminum is 2.58 g.

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Answer:

six

Explanation:

This is kinda like      3  * (Fe + 2O + 2H)      which would be SIX hydrogen atoms  ( or 3 hydrogen molecules)

Answer:

1. copper is a pure substance

2. sugar dissolved in solution (sometimes called a homogeneous mixture) is a mixture of sugar and water (the sugar and water don't react with each other)

3. carbon dioxide is a pure substance because there are only CO2 molecules

4. seawater is a mixture of salt, water, and other things

The molarity of the solution is 2.33 mol /L

molarity is a physical quantity that describes the substance's number of moles available in the unit liter volume of the solution. A mole per liter is a measurable unit to explain molarity.

Number of moles of the NaCl is

np = 3.50 mol

The volume of the solution is np = 1.50 L

The expression for the molarity solution is cm = np/vp

At the value and get the above expression

Cm = 3.50/ 1.50

      = 2.33 mol /L

Thus the molarity of the solution is 2.33 mol /L

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A beam of light has a wavelength of 280 nanometers. The frequency of the light is  1.07 × 10¹⁵ Hz.

the information in the question is given as :

wavelength of beam of light = 280 nm

the relation between the frequency and the wavelength is given as :

F = c / λ

where,

F = frequency of the light

c = speed of light

λ = wavelength of light

speed of light , c is = 3 × 10⁸ m/s

substituting all the value in the formula for the frequency, we get:

F = c / λ

F =  3 × 10⁸  / 280 × 10⁻⁹

F = 0.0107 × 10¹⁷ Hz

F = 1.07 × 10¹⁵ Hz

Thus, A beam of light has a wavelength of 280 nanometers. The frequency of the light is  1.07 × 10¹⁵ Hz.

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Yes, Tin and her cousin see the same phase of the moon at the same time.

The Moon is described as the Earth's only natural satellite. The moon is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth.

Tin and her cousin see the same phase of the moon at the same time because  because the phase of the Moon does not change as the Earth rotates.

There are eight moon phases and they include:

These eight phases are, in order,

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The dual nature of light deals with light as particles and as waves.

The dual nature of light refers to the inherent characteristic of light to behave as waves on one hand and to behave as particles on another hand.

Light behaves as a special kind of wave known as an electromagnetic wave. Light behaves as waves in a different types of phenomena. These include:

Light has a wavelength, frequency, and velocity and has the ability to reflect, refract, interfere, and diffract just like a typical wave.

Light behaves as particles in two phenomena. These are:

Light has energy and moment just like every other particle.\

Due to these 2-face abilities, light is considered both a particle and a wave.

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Answer:

Dinitrogen trioxide (triphosphide)

Explanation:

1. In order to answer this one and the next one, we will use mass percentage as our guide, since every compound has a mass percentage for each element, and this is found by checking the total mass and the separate masses of each element, for example, MgF2, the mass percentage is 39% for Mg and 61% for F2, this is due to their molar mass, 24g for Mg and 38g for F2

We have 27.1 g of Mg, and this will always correspond for 39% of the total mass of the compound, so we can do the following math:

100% = x

39% = 27.1g

x = 69.5 grams is the total mass of MgF2, now we only have to subtract the value of Mg and then we will have F2

69.5 - 27.1 = 42.4 grams, this is the mass of Fluorine

2. The same step by step from the previous question, 36% of the total mass is Al and 64% is S, but this question has a little difference, now we have the mass of the compound, but the process is very similar

100% = 50.2 grams

64% = x grams

x = 32.1 grams, which can be considered as letter A

Predicted appearance of the Moon on July 4, 2012 is close to a full moon

The moon phase for july 4th 2012 is a wanning gibbous phase and this is the first phase after the full moon where the illumination of the moon decreases each day until it reaches 50% means the last quarter phase on this day the moon is 14.05 days old and 99.98% illuminated with a tilt of 187.208° and the approximate distance from earth to moon is 265.226.10 km and moon sign is Capricorn

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The type of disturbances caused by earthquake waves include Volcanic eruptions and Explosions (Options C and E).

The expression earthquake waves make reference to a wave of energy on the ground due to the breakdown of the Earth's crust as a consequence of an earthquake, which is a natural phenomenon that releases energy due to the friction between tectonic plates.

Therefore, with this data, we can see that earthquake waves release energy and it may be dangerous since may cause explosions and also volcanic eruptions in the zone of the earthquake.

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Hydrogen atom and chlorine atom makes hydrogen chloride molecules.

It is the lowest point in the substance and possesses chemical elements. Atoms don't exist on their own; instead, they combine to create ions and molecules, which combine to create the substances that we can see, feel, and touch.

One or more atoms joined together by covalent (chemical) connections make up molecules. Atoms can be imagined as circles with a central nucleus (consisting of protons and neutrons) and one or more concentric circles surrounding it that represent the "shells" or "levels" in which the electrons surrounding the atom's nucleus are located as well as markings that distinguish the electron. every level

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igneous is moved to Earth's surface and exposed to energy from the sun, it could weather into smaller rock pieces that could form sedimentary rock

The mass of an object on a triple- beam balance the three weights on the beam 100, 95, and 5 grams. then the density is 2.67 g / cm³.

Density is defined as the evaluation of how closely something is packed. Because it enables us to predict which compounds will float and which will sink in a liquid, density is a crucial notion.
Density can be expressed as

Density = mass / volume

Given

Mass = 100 + 95 + 5 /3

         = 200 / 3

         = 66.7 g

Volume = Initial volume - final volume

             = 50 - 75

             = 25 ml

Density = 66.7 / 25

             = 2.67 g / cm³

Thus, the mass of an object on a triple- beam balance the three weights on the beam 100, 95, and 5 grams. then the density is 2.67 g / cm³.

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The reaction between Potassium sufide and copper nitrate is as follows:

Cu(NO3)₂ (aq) + K₂S (aq) ---> CuS (s) + 2KNO₃ (aq). It is a precipitation reaction.

In this reaction, copper(II) nitrate is reacting with potassium sulfide to form copper sulfide and potassium nitrate. Copper sulfide is insoluble in water, so it will precipitate out of the solution as a solid.

Cu(NO3)₂ (aq) + K₂S (aq) ---> CuS (s) + 2KNO₃(aq)

This is a precipitation reaction where the products are a solid and two aqueous solutions. The chemical formulas of the reactants are Copper (II) Nitrate and Potassium Sulfide. The products are Copper Sulfide and Potassium Nitrate. The phases of the reactants are aqueous, and the products are solid and aqueous.

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Answer:

An electrical insulator is a material in which electric current does not flow freely

Explanation:

Answer:

Answer is C,

Explanation:

It diminished local resources, decreasing the population.

The value of Y in the formula when 2.8g of silicon react with 3.2g of oxygen, is 2

The numbers in the formula of a compound determine the ratio of moles of each element in the compound.

Given:

2.8g of silicon

3.2g of oxygen

[relative atomic mass of silicon is 28 and of oxygen is 16]

For silicon, n = 2.8 ÷ 28 = 0.1    (n= moles)

For oxygen, n = 3.2 ÷ 016 = 0.2

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.1 moles.

For Silicon = 0.1/0.1 = 1

For Oxygen = 0.2/0.1 = 2

Taking the mole ratio as their subscripts.

The ratio of Si:O is 1:2

SiO[tex]_{2}[/tex] is the formula of silicon dioxide.

The value of y in the formula SiO[tex]_{Y}[/tex] is 2 when 2.8g of silicon react with 3.2g of oxygen.

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Answer: A reaction in which electrons are transferred between different atoms

Explanation:

A redox reaction example:

oxidation: Zn(s) --> Zn^2+(aq) + 2e-

reduction: Cu^2+(aq) + 2e- --> Cu(s)

redox: Zn(s) + Cu^2+(aq) --> Zn^2+(aq) + Cu(s)

2 electrons are transferred between Zn and Cu.

Number of hybrid and hybridized orbitals of

The combination of two or more atomic orbitals is called a hybrid orbital. Hybrid orbitals overlap to form σ bonds. The regular atomic orbitals are the unhybridized orbitals. Unhybridized orbitals overlap to form π bonds.

Carbon: Carbon is a chemical element. It is denoted by C. Carbon's atomic number is 6.

Nitrogen: Nitrogen is a chemical element. It is denoted by N. Nitrogen's atomic number is 7.  

Therefore, the number of hybrid orbitals and unhybridized orbitals in,

⇒ Carbon atom ( [tex]C_{a}[/tex] ): 2 - hybrid and 2 - unbridized

⇒ Nitrogen atom ( [tex]N_{b}[/tex] ): 4 - hybrid and 0 - unhybridized

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The complete question is

What is the number of hybrid orbitals and unhybridized orbitals, respectively, that are associated with the carbon atom labelled "a" and the nitrogen atom labelled "b"?

[tex]H. .:C^ :_:[/tex] is the lewis structure of HCl

Dots are used to indicate the locations of electrons surrounding the atoms in a molecule's Lewis structure, while lines or pairs of dots stand in for covalent bonds between atoms. The goal of creating a Lewis dot structure is to locate lone electron pairs in molecules in order to better understand how chemical bonds are formed. Both molecules with covalent bonds and coordination compounds can have Lewis structures. Covalent bonds share electrons, which is the cause. It's more like one atom gives an electron to the other atom in an ionic connection.

Lewis structures bear his name because it was he who first proposed the concept in the 1916 paper "The Atom and the Molecule."

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Benzene can be produced by the use of three molecules of etheyne as shown.

The term benzene is a compound that is aromatic in nature. When we say that the compound is aromatic we mean that the compound is also satisfies the Huckel rule and there are [4n + 1] number of pi electrons in the molecule.

We can make a mole of benzene when we heat three moles of ethyne to a very high temperature. We have to recall that benzene is made up of three double bonds that are resonating and that the compound is quite stable. It does not undergo an addition reaction but it does undergo a substitution reaction.

The way that we can be able to produce benzene by the use of three molecules of ethyne have been shown in the image attached to this answer.

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Let,X = First acid solution contains 25% acid

     Y = Second acid solution contains 45% acid

     Z = Third acid solution contains 85% acid

Restriction given ,Z=3Y

So, X = First acid solution contains 25% acid

     Y = Second acid solution contains 45% acid

     3Y = Third acid solution contains 85% acid

Account for concentration of the intended acid solution;

                  = 25X + 45X + (3Y×85)/260 = 35

                  =25[X +12Y]/260 = 35

                  = X+12Y = 364. ————— equation (1)

Account for volume;

                  =X+Y+Z = 260

                  =X+Y + 3Y = 260

                   X+ 4Y = 260 ——————equation (2)

Substrate equation (2) from (1)

We get , Y = 13

Put Y = 13 in equation (2)

We get X = 208

and From X+Y+Z = 260; Z = 65

So ,208 ml of First solution ,13 ml of second solution and 65 ml of third solution should be used.

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Answer:

Explanation:

Because they have electrical cords  :P    But really,  b/c electron movement is a convenient attribute of many elements.   The electrons are "loose"  on most metals, so they can conduct electricity.  

Answer:

The benefits of power electronics are: High power density power supplies. Improved efficiency of up to 99% in power conversion. Noise-sensitive applications such as in medical devices are also transitioning to switching power supplies because of the efficiency and reliability.

Answer:

Covalent compounds are always formed between two non-metals.

Explanation:

The answer is FALSE!

Covalent compounds are always formed between two non-metals. The non-metal can not lose electrons they can only gain the electron or they can share the electron to complete its octet.

Hope this helps!

Answer:

The covalent compounds are always formed by 2non-metal elements, so the answer is false