Which mineral will scratch glass?

Answer:

Nepal is rich in biodiversity

There are 7.407 x 10 25 electrons inside the container filled with 41 moles of neutral lithium.

Lithium is an element with an atomic number of 3. Since it has a neutral charge, the atomic number would be equal to subatomic particles proton and electron. Therefore, there 3 electrons in neutral lithium.

To solve for the number of electrons in a given number of moles of lithium, we are going to be using Avogadro's number to determine the number of lithium atoms present in the container.

Avogadro's number is the number of units, which could either be atoms, molecules, or particles, per mole of a substance and is equal to 6.02214076 x 10 23 units/mol.

(41 mol lithium)*(6.02214076 x 10 23 atoms/mol)*( 3 electrons/atom)

= 7.407 x 10 25 electrons

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Answer:

Graphene is a nanomaterial that is often used with other compounds to desalinate and decontaminate water.

The electrical behavior of semiconductor devices and electronics can be engineered using a process called Doping

Explanation:

Explanation:

sugar is a compound because the elements are chemically combined but it also can be dissolved, tho the sugar itself isn't a solution, only when added to water

Carbon bonded to both an oxygen bonded to a hydrogen.

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Explanation:

Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.

Answer:

A)

over time, the amount of atmospheric carbon dioxide increases

Explanation:

Answer: a) over time, the amount of atmospheric carbon dioxide increases

Explanation:

Use the formula such as length x width x height, first, look on the bottom of the army soldier's foot.

Through a polymerization or polycondensation process, plastics are created from natural resources such cellulose, coal, natural gas, salt, and crude oil. Plastics are made from organic, naturally occurring substances including cellulose, coal, natural gas, salt, and, of course, crude oil.

A thermoset polymer cannot be melted and reshaped once it has been created, despite the fact that all plastics undergo liquid phase during processing and solid phase upon completion. A polymer can have a variety of arrangements for its monomers.

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Answer:

A. ocean winds can carry moisture with them and can bring rain and fog over inland areas

Explanation:

It's "A. ocean winds can carry moisture with them and can bring rain and fog over inland areas' for K12 (OHVA to be exact)

Answer:

ocean currents regulate global climate, helping to counteract the uneven distribution of solar radiation reaching Earth's surface

Answer:

Temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.

Explanation:

The difference between heat and temperature is that temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.

Temperature is the measure of cold or heat, often measurable with a thermometer while heat is the flow of thermal energy from a substance with higher temperature to that with a lower temperature.

Temperature is a scalar quantity while heat is a vector quantity. This suggests that temperature has no direction while heat posseses direction.

Therefore, the difference between heat and temperature is that temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.

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Answer: A. 5.41

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} Al=\frac{2.50g}{27g/mol}=0.0926moles[/tex]

[tex]\text{Moles of} Pb(NO_3)_2=\frac{8.65g}{331g/mol}=0.0261moles[/tex]

[tex]2Al(s)+3Pb(NO_3)_2(aq)\rightarrow 3Pb(s)+2Al(NO_3)_3(aq)[/tex]  

According to stoichiometry :

3 moles of [tex]Pb(NO_3)_2[/tex] require  = 2 moles of [tex]Al[/tex]  

Thus 0.0261 moles of [tex]Pb(NO_3)_2[/tex] will require=[tex]\frac{2}{3}\times 0.0261=0.0174moles[/tex]  of [tex]Al[/tex]

Thus [tex]Pb(NO_3)_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Al[/tex] is the excess reagent.

As 3 moles of [tex]Pb(NO_3)_2[/tex] give = 3 moles of [tex]Pb[/tex]

Thus 0.0261 moles of [tex]Pb(NO_3)_2[/tex] give =[tex]\frac{3}{3}\times 0.0261=0.0261 moles[/tex]  of [tex]Pb[/tex]

Mass of [tex]Pb=moles\times {\text {Molar mass}}=0.0261moles\times 207g/mol=5.41g[/tex]

Thus 5.41 g of solid lead will be produced from the given masses of both reactants.

Answer:

Solute=the substance which a solvent dissolve to produce homogeneous mixture

Solvent= the substance in which a solute dissolve to produce homogeneous mixture

Explanation:

solvent: The liquid in which a solute is dissolved to form a solution.

solute: The component in a solution, dissolved in the solvent.

Answer:

Explanation: Liquid from the lakes may have evaporated and seeped into the surface; scientists suspect seasonal changes — from winter to summer — also played a role in the lakes' disappearance. This infrared-color mosaic of data from the Cassini Visual and Infrared Mapping Spectrometer (VIMS) shows the north pole of Titan

Answer:

the Potential Energy that is happened are all actions.

Explanation:

Potential energy is a property of a system and not of an individual body or particle; the system composed of Earth and the raised ball, for example, has more potential energy as the two are farther separated.

in other words

In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors

If Justin drives 3 miles north and 1.5 miles to the east to get to school and takes him 45 minutes, his average speed/velocity is 6 miles/hour north east.

Speed is the amount of distance traveled by an object per unit of time. On the other hand, velocity is the amount of speed and the direction it is moving. Speed is a scalar quantity while velocity is a vector quantity.

To get the speed of Justin driving from home to his school, divide the distance he traveled by the amount it took him.

speed = (3 miles + 1.5 miles) / 45 minutes(1hr/60 minutes)

speed = 6 miles/hour

Taking note of the direction he traveled, the velocity will be:

velocity = 6 miles/hour north east

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John Dalton's original atomic theory contained the following key ideas and the incorrect one is that elements are made of tiny indivisible particles called atoms and is denoted as option A.

This is defined as the smallest unit of matter which forms a chemical element and Dalton proposed that it was indivisible which was later proved wrong.

It was later discovered that atom is made up of sub atomic particles such as proton, electron and neutron. This was therefore the reason why option A was chosen as the most appropriate choice.

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The options include:

A. elements are made of tiny indivisible particles called atoms

B. Atoms are unchanged in chemical reaction

C. Atoms can join together in whole number ratios to form compounds.

D. The atoms of each element are unique

The molar mass of B(NO₃)₃ - Boron nitrate : 196.822 g/mol

In stochiometry therein includes  

Relative atomic mass (Ar) and relative molecular mass / molar mass (M)  

So the molar mass of a compound is given by the sum of the relative atomic mass of Ar  

M AxBy = (x.Ar A + y. Ar B)  

The molar mass of B(NO₃)₃ - Boron nitrate :

M B(NO₃)₃ = Ar B + 3. Ar N + 9.Ar O

M B(NO₃)₃ = 10.811 + 3. 14,0067 + 9. 15,999

M B(NO₃)₃ = 196.822 g/mol

The chemical compound's empirical formula is NS.

The chemical compound's molecular formula is N4S4.

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the question you are looking for is

A compound containing only sulfur and nitrogen is 69.6% S by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound?

Answer:

Explanation:

The density is measured by: D=mV . Therefore, for the piece of wood in question the density could be calculated by: D=mV=57g125cm3=0.46gcm3 .

Answer:

Explanation:

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Answer:

The bigger marble may hold more momentum

Explanation:

Answer:

b) Ar

Explanation:

Given data:

Mass of sample gas = 120.00 g

Volume of gas = 67.2 L

Identity of gas = ?

Solution:

We will calculate the molar mass do identify the sample:

Number of moles of gas:

PV = nRT

1 atm×67.2 L = n×0.0821 atm.L/mol.K×273 K

67.2 atm.L = n × 22.42atm.L/mol

n = 67.2 atm.L / 22.42atm.L/mol

n = 3 mol

Molar mass of gas:

Number of moles = mass/molar mass

Molar mass = 120.00 g/3 mol

Molar mass = 40 g/mol

The given sample of a gas is Ar.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{8.32 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 13.820598...[/tex]

We have the final answer as

Hope this helps you

Answer:

Ionization energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.

The ionization energy decreases as the size increases. The electrons get added to the new shell and the nuclear charge increases. But the effect of addition of new sheels overcomes the increase of nuclear charge.The valence shell moves far from the nucleus.

Thus the valence electron gets less tightly held by the nucleus and thus less energy is required to remove the valence electron.

Shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud, due to a difference in the attraction forces of the electrons on the nucleus. Thus as the size increases and the electrons move away from nucleus, the attractive forces decrease.

Answer: A.ionic

Explanation:

Got it right

Answer:

Ionic

Explanation:

Answer:

Father - Mother

Sperm - Egg and those fertilized are called a Zygote

Explanation:

Answer:

one half from the father and the other half from the mother

Explanation:

hope it helps

The limiting reactant​ : Fe

Reaction

3Fe + 4H₂O ⇒ Fe₃O₄ + 4H₂

mass of H₂O = 10 g

mol H₂O (MW=18 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{10}{18}=0.56[/tex]

mass of Fe = 16.8 g

mol Fe(MW=56 g/mol) :

[tex]\tt mol=\dfrac{16.8}{56}=0.3[/tex]

Limiting reactant : the smallest ratio between mol : reaction coefficient

Fe :

[tex]\tt \dfrac{0.3}{3}=0.1[/tex]

H₂O :

[tex]\tt \dfrac{0.56}{4}=0.14[/tex]

Fe as limiting reactant

pH of mixed solution = 4.3

A buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.  

The buffer solution can be acidic or basic  

Acid buffer solution consists of weak acids and their salts.  

[tex]\tt \displaystyle [H^+]=Ka\times\frac{mole\:weak\:acid}{mole\:salt\times valence}[/tex]

valence according to the amount of salt anion  

mol CH₃COOH = 25 ml x 0.9 = 22.5 mlmol

mol NaOH = 25 ml x 0.45 = 11.25 mlmol

ICE method :

Reaction

NaOH + CH₃COOH ---> CH₃COONa + H₂O

11.25       22.5

11.25       11.25                       11.25        11.25

               11.25                        11.25        11.25

mol acid = 11.25, mol salt = 11.25, Ka CH₃COOH = 5.10⁻⁵

Then [H⁺]=

[tex]\tt [H^+]=5.10^{-5}.\dfrac{11.25}{11.25\times 1}\rightarrow salt~valence=1\\\\(H^+]=5.10^{-5}\\\\pH=5-log5=4.3[/tex]