Please give the correct answer. Please don’t give me any random websites. I will add you if you get it correct

Answer:

The reactant that produces a lesser amount of product is the limiting reagent. The reactant that produces a larger amount of product is the excess reagent. To find the amount of remaining excess reactant, subtract the mass of excess reagent consumed from the total mass of excess reagent given.

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Answer:

[tex]\boxed {\boxed {\sf 1.393 *10^{24} \ atoms \ B}}[/tex]

Explanation:

1. Convert Grams to Moles

Use the molar mass (found on the Periodic Table) to convert from grams to moles.

Use this value as a ratio.

[tex]\frac {10.81 \ g \ B }{1 \ mol \ B}[/tex]

Multiply by the given number of grams.

[tex]25.00 \ g \ B *\frac {10.81 \ g \ B }{1 \ mol \ B}[/tex]

Flip the ratio so the grams of boron cancel out.

[tex]25.00 \ g \ B *\frac {1 \ mol \ B }{10.81 \ g \ B}[/tex]

[tex]25.00 *\frac {1 \ mol \ B }{10.81 }[/tex]

[tex]\frac {25.00 \ mol \ B }{10.81 }=2.312673451 \ mol \ B[/tex]

2. Convert Moles to Atoms

We use Avogadro's Number, 6.02*10²³: the number of particles (atoms, molecules, etc.) in 1 mole of a substance. In this case, the particles are atoms of boron.

[tex]\frac {6.02*10^{23} \ atoms \ B} {1 \ mol \ B}[/tex]

Multiply by the number of moles we calculated.

[tex]2.312673451 \ mol \ B *\frac {6.02*10^{23} \ atoms \ B} {1 \ mol \ B}[/tex]

The moles of boron cancel.

[tex]2.312673451 *\frac {6.02*10^{23} \ atoms \ B} {1 }[/tex]

[tex]2.312673451 *6.02*10^{23} \ atoms \ B} =1.39269195*10^{24} \ atoms \ B[/tex]

The original value of grams has 4 significant figures, so our answer should have the same. For the number we calculated, that is the thousandth place.

[tex]1.392\underline69195*10^{24} \ atoms \ B[/tex]

The 6 tells us to round the 2 to a 3.

[tex]1.393 *10^{24} \ atoms \ B[/tex]

25.00 grams of boron is equal to 1.393*10²⁴ atoms.

Answer:

There are chemical cross-links between the two strands in DNA, formed by pairs of bases. They always pair up in a particular way, called complementary base pairing: thymine pairs with adenine (T–A) guanine pairs with cytosine (G–C)

Explanation:

Hope it helps u

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Answer:

Explanation:

Moles of Pb(NO3)2 =  mass/molecular mass

= 50.0 grams/(207.20*1 + 14.01*2 + 16*6)

= 50.0 grams/331.22

= 0.15 moles

Moles of NaI

= 30/(22.99+126.9)

= 30/149.89

= 0.2 Moles

A. NaI is less 2x Pb(NO3)2 so NaI is the limiting reagent.

B. The ratio is 1 to 2 so there is 0.15 - 0.2/2 = 0.05 mole

or 16.78 grams of Pb(NO3)2 left.

C. As NaI is limiting, only 0.2 Moles of NaNO3 is formed.

Mass =  Moles * Molecular Mass

Molecular Mass of NaNO3 can be calculated as:  

Na - 22.99

N - 14.01

O - 3(16) = 48

23+14+48 = 85gram / mole

Thus, Mass =  0.2*85  = 17 gram of NaNO3

Mass is conserved in a chemical reaction.

Mass of PbI2 can be calculated as:

50+30-16.78-17

= 46.3 gram of PbI2

Mass =  

12.75

Thus, 12.75g of Sodium Nitrate can be formed

Answer:

Explanation:

Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)

MM for each compound -

Pb(NO3): 207 + 14x2 + 16x3x2 = 331

PI2: 207 + 127x2 = 461

NaI: 23 + 127 = 150

NaNO3: 23 + 14 + 16x3 = 85

Moles of Pb(NO3)2 = 50/331 = 0.15

Moles of NaI = 30/150 = 0.2

Ratio of moles is 1:2

So NaI is limiting

Limited to 0.2/2 = 0.1 mole of Pb(NO3)2

Excess = 0.15 - 0.1 = 0.05 mole

Mass remains = 0.05x331 = 16.55 grams

Moles of NaNO3 formed = Moles of NaI reacted = 0.2

Mass = 0.2x85 = 17 grams

Moles of PbI2 formed = Moles of Pb(NO3)2 reacted = 0.1

Mass = 0.1x461 = 46.1 grams

If 12 grams of NaNO3 actually formed in the reaction,

percent yield = 12/17x100% = 70.6%

Answer: well I don’t have either picture but here goes anyway. It could be that the suns rotation matched up with the moon being 400 miles away from it and 400 times bigger it could be in image 1 the sun is only at a partial eclipse. With no images kinda had to wing it but I hope it helps :D

A lunar eclipse is an event that occurs when the sun, moon, and earth are aligned. It is happening in image 2 as Earth is obstructing the sun’s light.

In lunar eclipse Earth completely covers the surface of the moon which makes the surface look red and dark. It happens only when the Moon is opposite the sun in the sky.

It is not seen in the first image as the earth is incapable of totally blocking the sunlight and hence does not result in a lunar eclipse. In the second image, the Earth has covered the whole surface of the moon and hence is blocking the sunlight.

Therefore, a lunar eclipse is seen only in image 2.

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Answer:

Properties of transition elements

they are all metals and that most of them are hard, strong, and lustrous, have high melting and boiling points, and are good conductors of heat and electricity.

Answer:

A

Explanation:

A, Na b/c The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive. Lithium, sodium, and potassium all react with water,

Answer: Subatomic particle which orbits the nucleus is electron.

Explanation:

Every atom contains three sub-atomic particles. These are protons, neutrons and electrons.

Protons contain a positive charge, neutrons have no charge and electrons have a negative charge.

Both protons and neutrons reside inside the nucleus of the atom whereas electrons reside outside the nucleus of atom and revolve around the nucleus.

Therefore, it is concluded that subatomic particle which orbits the nucleus is electron.

Answer:

Your answer is B

Boron

Good luck

Explanation:

Answer:

2.11

Explanation:

1/0.473 = 2.11

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option C.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

Since phosphorus is a nonmetal, we need a metal. Out of given option the only element that is metal is Magnesium while others are non metal.

Therefore, the correct option is option C.

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Answer:

option first is the right answer

Answer:

electrolytes

Explanation:

If an electrical current can run though a solution, it is said to contain  ions and the solution in which ions are present is called as electrolytes.

An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.

Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.

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Answer: The energy of a photon with a wavelength of 820 nm is [tex]2.42 \times 10^{-19} m[/tex].

Explanation:

Given : Wavelength = 820 nm

Convert nm into meter as follows.

[tex]1 nm = 10^{-9}\\So, 820 nm = 820 nm \times \frac{10^{-9} nm}{1 nm}\\= 820 \times 10^{-9} m[/tex]

The relation between energy and wavelength is as follows.

[tex]E = \frac{hc}{\lambda}[/tex]

where,

E = energy

h = Planck's constant = [tex]6.63 \times 10^{-34} kg m^{2}/s[/tex]

c = speed of light = [tex]3.0 \times 10^{8} m/s[/tex]

[tex]\lambda[/tex] = wavelength

Substitute the values into above formula as follows.

[tex]E = \frac{hc}{\lambda}\\= \frac{6.63 \times 10^{-34} kg m^{2}/s \times 3.0 \times 10^{8} m/s}{820 \times 10^{-9} m}\\= \frac{1.989 \times 10^{-25}}{820 \times 10^{-9}}\\= 2.42 \times 10^{-19} m[/tex]

Thus, we can conclude that energy of a photon with a wavelength of 820 nm is [tex]2.42 \times 10^{-19} m[/tex].

Answer:

0.033 moles of KCl are formed.

Explanation:

The reaction that takes place is:

To solve this problem we need to convert 0.05 moles of O₂ into moles of KCl, to do so we use the stoichiometric coefficients of the balanced reaction:

If 0.05 moles of O₂ are produced, then 0.033 moles of KCl are formed as well.

Answer:

it is converted to kinetic energy

Answer:

3.6mol

Explanation:

The balanced chemical equation of this reaction is given as follows:

Ni + 2HF → NiF2 + H2

Based on the above equation, 2 moles of HF will react to produce 1 mole of NiF2.

According to this question, to make 174 grams of NiF2, we find the number of moles of HF required. However, we first convert the mass value of NiF2 to mole value using;

mole = mass/molar mass

Molar mass of NiF2 = 58.7 + 19(2)

= 58.7 + 38

= 96.7g/mol

mole = 174/96.7

mole = 1.799mol of NiF2

Hence, if 2 moles of HF will react to produce 1 mole of NiF2.

- 1.799mol of NiF2 will require (1.799 × 2) = 3.598

= 3.6mol of HF.

Hydrogen bond will be formed when the end of the O₂ molecule that is

closest to the positive end of the H₂O molecule.

These are referred to as electrostatic force which occurs between

Hydrogen atom and other electronegative atom bearing a lone pair of

electrons.

Oxygen is electronegative and has lone pair of electrons which is why the

bond formed will be Hydrogen bond.

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Answer:

Surface

Explanation:

Answer:

Explanation:

Step 1

The question is based on the concept of PH and pOH calculations.

pH is defined as negative logarithmic of hydronium Ion concentration.

while pOH is defined as negative logarithmic of hydroxide ion concentration of the solution.

Step 2

[H+] = 7.7*10-7  M  

pH = -log[H+]  

    = -log ( 7.7*10-7 )

     = 6.12

Step 3

pOH = 14 - pH

   = 14 - 6.11

  = 7.89

Answer:

A. the charge on their ions

Explanation:

Elements are grouped into the same group in the periodic table if they have the same valence electrons. However, the number of valence electrons an element has, determines the number of charges it can possess.

According to this question, two elements in the same group of the periodic table will have the same charge on their ions because they both have the same number of valence electrons.

Answer:

There are three primary types of bonding: ionic, covalent, and metallic. Definition: An ionic bond is formed when valence electrons are transferred from one atom to the other to complete the outer electron shell.

Explanation:

Answer:

The Watt

Explanation:

Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second.

The amount of energy transferred per unit time is called power, and power is measured in Watt.

Watt is the unit of power. It is used to measure the transfer of power. This is named after James Watt.

When one joule of energy is transferred in one second, this is the power of the Watt.

Thus, the amount of energy transferred per unit time is called power, and power is measured in Watt.

Learn more about Watt

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Explanation:

Mercury 0.377 g

Venus 0.905 g

Earth 1 g (midlatitudes)

Moon 0 .165 7 g (average)

Answer:

1 mole of P₄ consumed:4 moles of PBr₃ produced

Explanation:

Look at the coefficients in the balanced chemical equation to determine the ratios. For every 1 mole of P₄ consumed (P₄ has a coefficient of 1), 4 moles of PBr₃ would be produced (PBr₃ has a coefficient of 4).

Answer:

[tex]\boxed {\boxed {\sf 1 \ mole \ P_4 consumed \ to \ 4 \ moles \ PBr_3 \ produced}}[/tex]

Explanation:

To find the mole ratio, we must use the coefficients.

[tex]P_4+6Br_2 \rightarrow 4PBr_3[/tex]

This equation is balanced (4 atoms of P and 12 atoms of Br on both sides), so we can go straight to the coefficients.

So according to the coefficients above, for every 1 mole of P₄ that is consumed, 4 moles of PBr₃ are produced. Therefore, the ratio is 1 mole P₄ to 4 moles of PBr₃.

Answer:

I think option (d) is right answer

Answer:

In cellular respiration, complex molecules containing carbon react with oxygen to produce carbon dioxide and other materials. ... Matter is conserved during cellular respiration because atoms are conserved in physical and chemical processes

Explanation:

I hope this helps