What’s the best answer?

Answer:

Polling is a method used for the purification of copper or tin which contains oxide impurities

Answer:

Polling is used for the purification of copper or tin which contains oxide impurities. The impure metal is melted and stirred with green logs of wood. The heat of molten metal makes the green logs to liberate hydrocarbon gases which in turn reduce the metal oxide into metal.

Answer:

Th answer is b. convection.

Explanation:

As the heat rises it cools down and it sinks and as the cold sinks it heats up so then it rises back up.

Explanation:

P×V=n×R×T

L×atm / mol×K

n= PV /RT

Description:

So as we know that our Known variables: are P, V, R, T and our unknown variables are n. N= PV / RV. = 6.02 moles.

Answer: 6.02  moles

Hope this helps.

The moles of nitrogen gas present in 135 L at STP have been 6.02 moles.

The nitrogen gas has been assumed to be the ideal gas. For an ideal gas, at STP or standard pressure and temperature, the volume of 1mole of gas has been 22.4 L.

The STP conditions have been 273.15 K temperature, and 1 atm pressure.

Since, moles in 22.4 L gas been 1 mole. The moles in 135 L gas has been:

22.4 L = 1 mole

135 L = [tex]\rm \dfrac{1}{22.4}\;\times\;135\;moles[/tex]

135 L gas = 6.02 moles.

The moles of nitrogen gas present in 135 L at STP have been 6.02 moles.

For more information about the volume at STP, refer to the link:

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Answer:

Explanation:

there's no options that you put but usually if you add more of the reactant the rate will increase, adding a catalyst will increase the rate, and increasing the temperature if it's endothermic

um this is kinda weird I am take a guest SIF4

The formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4

From the question,

We are to determine which of the given formulae represents a tetrahedral molecule

In order to determine the molecule that represents a tetrahedral molecule, we will determine which of the molecules has a tetrahedral molecular geometry.

A tetrahedral molecular geometry has a central atom located at the center with four substituents that located at the corners of a tetrahedron

Among the given options, the molecule that has four substituents is SiF₄. Si is the central atom and the F atoms are the substituents.

Hence, the formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4

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The limiting reagent : NH₃

A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients, and small or exhausted reactants become a limiting reactant

Reaction

4NH₃(g)+5O₂(g)⇒4NO(g)+6H₂O(g)

mol NH₃ :

[tex]\tt \dfrac{4.5}{17}=0.265[/tex]

mol O₂ :

[tex]\tt \dfrac{15.8}{32}=0.494[/tex]

mol ratio

NH₃ :

[tex]\tt \dfrac{0.265}{4}=0.06625[/tex]

O₂ :

[tex]\tt \dfrac{0.494}{5}=0.0988[/tex]

Limiting reactants : NH₃ (smaller ratio)

The limiting reagent when a 4.50 g sample of ammonia is mixed with 15.80 g of oxygen is NH₃

The limiting reactant refers to the reactant that gets consumed first in a chemical reaction and thus it limits how much product can be created or developed. A method that can be used to determine limiting reactants that to divide the number of moles by their respective coefficients.

So,

For mol NH₃ :

[tex]= 4.5\div 17[/tex]

= 0.494

For mol O₂ :

[tex]= 15.8 \div 32[/tex]

= 0.494

For mol ratio

NH₃ :

[tex]= 0.265 \div 4[/tex]

= 0.06625

O₂ :

[tex]= 0.494 \div 5[/tex]

= 0.0988

Based on the above calculations we can say that it is NH₃

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Answer: B. Bohr and  D. Rutherford

Steel is a mixture of iron and carbon fused together with one or more other metals or nonmetals. Because steel is a mixture rather than a chemical compound, steel does not have a set chemical compound formula.

Answer:

No

Explanation:

Steel is a mixture of iron and carbon fused together with one or more other metals or nonmetals. Because steel is a mixture rather than a chemical compound, steel does not have a set chemical compound formula.

Formation. Our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a solar nebula—a spinning, swirling disk of material

Answer:

E

Explanation:

took the test

Answer:

98.08g/mol is your answer

Explanation:

hope this helps

Answer:

Second.

Explanation:

There are four types or kinds of the laws of thermodynamics, but in this question we are actually considering the second law of thermodynamics.

The second law of thermodynamics, in a simple sense means that energies can flow in an equilibrate manner. It can also be stated as the total entropy of the universe. The second law is normal refer to as Law concerning Entropy.

Thus, filling the gap in the Question above. Note that the word written in capital letters is the missing word.

"The SECOND law of thermodynamics states that when two objects of different temperature are in contact, heat energy will flow from the hotter to the cooler object."

Answer:

i agree

Explanation:

Answer:

Carbon dioxide

Explanation:

In the making of the muffins, there are many ingredients are used including flour, egg, butter, sugar, and flavoring of fruits. There is also a raising agent, the baking powder or baking soda used that reacts with the batter.

This reaction form bubbles of carbon dioxide, trapped in the air spaces during the baking and muffin raises. Carbon dioxide makes muffins light, by lifting the batter as it bakes.

Answer:

Explanation:

so, limiting reactants are the reactant which limit the continuing of the reaction or in simple word they are the element that run out first and are totally consumed

equation :

2koh+h2so4⇒ k2so4 +2h2o

if we have 4 mol of h2so4 and 3 mol of 2koh

                 number of produced moles of k2so4 on consuming all :

h2so4 ⇒ k2so4

1 mol          1 mol

4 mol            ?mol

no of mol of k2so4 if all h2so4 is consumed 4 mol

2koh⇒ k2so4

2 mol       1 mol

3 mol         ?mol

no of mol of k2so4 if we consume all koh = 1.5 mol

since the koh produces less mol on consuming it all

the koh is the limiting reactant

Examples of compounds include table salt or sodium chloride , sucrose (a molecule, nitrogen gas, a sample of copper, and water.

The number of molecules : 4.967 x 10²⁴

A mole is a number of particles(atoms, molecules, ions)  in a substance

This refers to the atomic total of the 12 gr C-12  which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles  

Can be formulated :

N = n x No

N = number of particles

n = mol

No = 6.02.10²³ = Avogadro's number

8.25 moles of C₈H₁₈

The number of molecules :

[tex]\tt 8.25\times 6.02\times 10^{23}=4.967\times 10^{24}[/tex]

Answer:

first u have to like draw like a number line uk how dey do in math but instead of num u add wht eva da question askin u

Explanation:

Answer:

500g Ika= 10.85 mol 500g (46.0699) - 10.35 mol - 3.00m - 13.62 kq 5.

Explanation:

Does this help?

A 3.00 M solution of [tex]C_2H_5OH[/tex] would be prepared by dissolving 0.500 kg of  [tex]C_2H_5OH[/tex] in 3.62 kg of water.

0.500 kg  [tex]C_2H_5OH[/tex] is equivalent to (mole = mass/molar mass):

      500g/46.07 = 10.85 moles of  [tex]C_2H_5OH[/tex]

3.00 M solution of  [tex]C_2H_5OH[/tex] can be prepared by dissolving 10.85 moles in (molarity = moles/volume):

                      10.85/3 = 3.62 Liters of water

3.62 liters of water weighs (density = mass/volume);

              1 x 3.62 = 3.62 kg

Thus, 3.62 kg of water will be required to prepare the solution.

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Answer:

5 x 10 x 3200 = 170 000J or 170kJ

Explanation:

i searched it lol

The energy needed to raise the temperature of a 5 kg block of concrete by 10° C is 170 000J or 170kJ.

Energy is defined as a quantitative property that is transferred to a body or to a physical system. It can also be defined as capacity of doing work.

There are basically five forms of energy

Heat energy = mass x heat capacity x raise in temperature

                     = 5 x 3200 x 10

                     = 170000 J or 170 kJ

Thus, the energy needed to raise the temperature of a 5 kg block of concrete by 10° C is 170 000J or 170kJ.

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Answer:

A

Explanation:

Answer:

Lead phosphate

Explanation:

Pb3(po4)2 has the compounded name of lead(II) phosphate.

It is a white, crystalline solid that is insoluble in water. Lead(II) phosphate is used in some paints and plastics, and it is also used as a pigment.

The name of the compound is based on the oxidation state of the lead atom. Lead can have two oxidation states, +2 and +4. In Pb3(PO4)2, the lead atom has an oxidation state of +2, so the compound is named lead(II) phosphate.

The phosphate ion has an oxidation state of -3, so there are two phosphate ions in the compound to balance the +6 charge of the three lead atoms.

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Answer:C

Explanation:The samples are composed of different proportions of copper and zinc

Answer:

The correct answer is 10

Answer:

It is more important because of the freedom.

Explanation:

While at home you can do your work of course... but you could lay down, take a nap. You could get on the game, play around. You could draw, and fiddle and dance and do WHATEVER you want with no teacher to stop you so you have to be your own motivation. You have to be your own teacher or its VERY easy to fail.