What is the wavelength of a
microwave with a frequency
of 2,450 MHz?

( a ) The pH of 4.8 × [tex]10^{-2}[/tex]  M solution is  1.3 ..

( b ) The pH of 4.71 pOH solution is 9.29

( c ) The pH of 9.61 × [tex]10^{-3}[/tex] M hydroxide ion solution is 11.98.

( d ) The pH of 1.37 × [tex]10^{-8}[/tex]   M solution is 8.17

( a )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

pH = - ㏒ [ 4.8 × [tex]10^{-2}[/tex]  M ]

pH = 1.3

Therefore , the pH of 4.8 × [tex]10^{-2}[/tex]  M solution is  1.3 .

( b )

The pOH = - ㏒ [  [tex]OH^{-}[/tex] ]    

Given pOH =  4.71

So put the value of  pOH .

pH + pOH = 14

pH  =  = 14 - pOH  =  14 -  4.71 = 9.29

Therefore , the pH of 4.71 pOH solution is 9.29 .

( c )

The pOH = - ㏒ [  [tex]OH^{-}[/tex] ]

Given concentration of hydroxide ion =  9.61 × [tex]10^{-3}[/tex] M

So put the value of  concentration of hydroxide ion in equation 1

pOH = - ㏒9.61 × [tex]10^{-3}[/tex] M

pOH = 2.01

pH + pOH = 14

pH  =  = 14 - pOH  =  14 - 2.01 = 11.98

Therefore , the pH of  9.61 × [tex]10^{-3}[/tex] M hydroxide ion solution is 11.98.

( d )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

pH = - ㏒ [ 1.37 × [tex]10^{-8}[/tex] M ]

pH = 8.17

Therefore , the pH of 1.37 × [tex]10^{-8}[/tex]   M solution is 8.17

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According to solving the object's mass is 94.9g.

One of the fundamental quantities in physics and the most fundamental aspect of matter is mass. A body's mass is the measurement of the volume of matter it contains. The kilogram serves as the SI unit for mass (kg). This is how the mass formula appears:

Mass is equal to Density x Volume.

How much space an object or substance occupies is determined by its volume.

A substance or object's mass is a measure of how much matter it contains. The density of an object or substance is the ratio of its mass to its volume, or the quantity of material it contains (its mass).

According to the question

Object density=2.6g/cm³

volume= 36.5 cm³

Formula :-Mass = Density × Volume

M=2.6g/cm³ ×36.5 cm³

M=94.9g

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Answer:

Oxygen

Explanation:

reduction is the removal of oxygen to a substance

Answer:

Filtration eg coffee maker

The mass of the iron object is 787.4 g.

The term density has to do with the mass per unit volume of the object. This implies that when we divide the mass of the object by the volume of the object, we get the density of the object.

We also have to note that the density is an intrinsic property of an object could be used as a means that can be harnessed in the process of trying to identify the unknown material that we have.

In this case we have the thorough depiction of the iron as we can see from the image attached and we want to find the mass of the object.

Volume of iron = 2 cm * 10 cm * 5 cm = 100 cm³

Density of iron = 7.874 g/cm³

Mass of iron = Volume * density =  100 cm³ *  7.874 g/cm³ = 787.4 g

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1) Mass of aluminum powder is 2.7 g.

2) Mass of magnesium sulfate is 19.9 g.

3) Mass of calcium oxide is 14g.

4) Mass of lead 412.2 g.

1) In the thermite reaction :

2Al     +     Fe₂O₃   ----->  Al₂O₃   +   2Fe

mass of  Fe₂O₃ = 8.0 g

molar mass of   Fe₂O₃ = 159.6 g/mol

number of moles = mass / molar mass

                             = 8.0 g / 159.6 g/mol

                             = 0.050 moles

1 mole of  Fe₂O₃ react with 2 mole of Al ,

0.050  Fe₂O₃ moles react with 2 × 0.050 = 0.1moles of Al

number of moles of Al = mass / molar mass

mass of Al = no. of moles × molar mass

                 = 0.1 mol × 27 g/mol

                 = 2.7 g

Thus, the mass of aluminum powder is needed to react with 8.0 g of iron (III) oxide is 2.7 g

2) the reaction is :

MgCO₃ +   H₂SO₄  ----->   MgSO₄   +   CO₂    +   H₂O

mass of MgCO₃ = 14.0 g

no. of moles of MgCO₃ = mass / molar mass

                                      = 14 g / 84.3 g/mol

                                      = 0.166 moles

1 mole of MgCO₃  produced 1 mole of MgSO₄,

0.166 mole of MgCO₃  produced 0.166 mole of MgSO₄

mass of MgSO₄ = 120.3 g/mol

no. of moles of MgSO₄ = mass / molar mass

mass of MgSO₄ = no. of moles × molar mass

                          = 0.166 mol × 120.3 g/mol

                          = 19.9 g

Thus, mass of magnesium sulfate crystals can be made from14.0g of magnesium carbonate and an excess of dilute sulfuric acid is 19.9 g

3) the reaction is :

CaCO₃   ----->   CaO + CO₂

mass of calcium carbonate = 25 g

molar mass of CaCO₃ = 100 g/mol

no. of moles of = mass / molar mass

                         = 25 / 100

                         = 0.25 mol

0.25 moles of CaCO₃ produced 0.25 moles of CaO

molar mass of  CaO = 56 g/mol

mass of CaO = no. of moles × molar mass

                      = 0.25mol × 56 g/mol

                      = 14 g

the mass of CaO produced 14 g.

4) PbO  +   H  ----->    Pb   + H₂O

mass of PbO = 446g

no. of moles = mass / molar mass

                     = 446 g / 223.3 g/mol

                     = 1.99 mols

1.99 moles of PbO produced 1.99 moles of Pb

molar mass of Pb = 207.2 g/mol

mass of Pb = no. of moles × molar mass

                   = 1.99 mol × 207.2 g/mol

                   = 412.2 g

Thus, Lead (ii) oxide PbO, reacts with hydrogen to for lead and steam. calculate the mass of lead in formed when 446g of lead (ii) oxide is 412.2g.

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Answer:

3FeSO4 + 2K3PO4 → Fe3(PO4)2 + 3K2SO4

Explanation:

Based on the percentage mass of magnesium oxide in the sample, the mass of Magnesium oxide in the sample is 0.42 g.

Magnesium is a metallic element with an atomic number of 12.

Magnesium is an important mineral that is used as a supplement s well as in drugs such as milk of magnesia.

Considering the given magnesium supplement:

1.02 g magnesium supplement contains 25.0% Mg by mass.

Magnesium is present in the supplement as magnesium oxide, MgO.

The molar mass of magnesium oxide, MgO = 40.30 g/mol

Molar mass of magnesium = 24.0 g

Percentage mass of Magnesium oxide in the sample = 40.3 / 24 * 25

Percentage mass of Magnesium oxide in the sample = 42%

Mass of Magnesium oxide in the sample = 42 % * 1.02

Mass of Magnesium oxide in the sample = 0.42 g

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The no. of moles of steam present in the cooker is 0.402 mol.

The ratio between a substance's given mass in a chemical reaction and the mass of one mole of that material is used to determine how many moles there are of that substance. Any material has an atomic mass of one mole, or 6.023 x [tex]10^{23}[/tex], according to Avogadro. Additionally, No. of moles is employed to represent concentration measurements like mole per liter and molecular weight.

Given:

Pressure, P = 3.20atm

Volume, V = 4L

Temperature, T = 115℃ = 115 + 273 = 388K

To find:

No. of moles, n = ?

Formula:

PV = nRT

Calculations:

n = 3.20 x 4 / 0.082 x 388

n = 0.402 mol

Result:

0.402 moles of steam is present in the cooker.

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Lithium react slowly with water while potassium react violently with water. potassium caught  fire while lithium does not caught fire.

Chemical reaction is defined as a procedure in which one or more compounds, known as reactants, are changed into one or more distinct substances, known as products.

It can also be defined as a process in which two or more molecules collide with the proper orientation and enough force to produce a new product.

There are mainly five types of reaction.

Thus, Lithium react slowly with water while potassium react violently with water. potassium caught  fire while lithium does not caught fire.

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mass of glucose (in grams) can the plant synthesize from the co 2 is 25.8g

molar mass of [tex]CO_{2}[/tex]= 44.01 g/mol

molar mass of [tex]C_{6} H_{12} O_{6}[/tex] =180.18g/mol

[tex](g)CO_{2}-- > (mol)CO_{2} --- > (mol)C_{6} H_{12} O_{6}-- > (g)C_{6} H_{12} O_{6}[/tex]m

       [tex]\frac{1 mol CO_{2} }{44.01 g CO_{2}}[/tex]                     [tex]\frac{1 mol C_{6} H_{12} O_{6} }{ 6 mol CO_{2}}[/tex]                  [tex]\frac{180.18 g C_{6} H_{12} O_{6} }{ 1 mol C_{6} H_{12} O_{6} }[/tex]

37.8g x       [tex]\frac{1 mol CO_{2} }{44.01 g CO_{2}}[/tex]      x         [tex]\frac{1 mol C_{6} H_{12} O_{6} }{ 6 mol CO_{2}}[/tex]    x   [tex]\frac{180.18 g C_{6} H_{12} O_{6} }{ 1 mol C_{6} H_{12} O_{6} }[/tex]

= 25.8g  [tex]C_{6} H_{12} O_{6}[/tex]

mass of glucose (in grams) can the plant synthesize from the co 2 is 25.8g.

It is a monosaccharide because it is the most basic type of carbohydrate. It has one sugar, thus this indicates. It's not by itself. Galactose, ribose, and fructose are examples of additional monosaccharides. One of the body's preferred sources of fuel in the form of carbs is glucose, along with fat.

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Answer:

6 atoms

Explanation:

Br2 + 2KCl = 2KBr + Cl2

2KBr = 4 atoms

Cl2 = 2 atoms

total 6 atoms

Chemical reaction between bromine and potassium chloride is  2 KCl +Br₂[tex]\rightarrow[/tex] 2 KBr +Cl₂. There are 6 atoms in the product .

Chemical reactions are defined as reactions  which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are four types of chemical reactions:

1) combination reaction

2)decomposition reaction

3) single displacement reaction

4) double displacement reaction

During chemical reactions atoms are rearranged and reactions are accompanied by an energy change as new substances are formed.

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The type of force exists as a result of positive and negative charges is C. Strong nuclear.

It is known to often holds Quarks, the fundamental particles that make up protons and neutrons of the atomic nucleus, are held together by the strong force, which also keeps protons and neutrons together to form atomic nuclei.

Note that Positively charged protons as well as neutrally charged neutrons are created when the strong nuclear force brings together positively and negatively charged quarks. In the atomic nucleus, protons and neutrons are also held together by the strong nuclear force.

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Answer:

Any form of semi high energy waves cause the water molecules inside the marshmallow to vibrate which heat and soften the sugar matrix inside the marshmallow. The weakened sugar matrix allows air bubbles within the marshmallow to expand rapidly and the marshmallow puffs up and becomes goo. If this proccess is repeated it can completly change it's state of matter.

Explanation:

Answer:

Sn°(s) + 2Ag⁺(aq)  => Sn²⁺(aq) + 2Ag°

Explanation:

Sn°(s) => Sn²⁺(aq) + 2e⁻    [oxidation]

2Ag⁺(aq) + 2e⁻ => 2Ag°(s)  [reduction]

Sn°(s) + 2Ag⁺(aq)  => Sn²⁺(aq) + 2Ag°

Incomplete question but using assumed values, the volume of m potassium dichromate solution that contains potassium dichromate is 9.1L

To calculate the volume of solution, we use the equation for molarity of solution:

Molarity of solution = mass of solute/molar mass of solute*volume of solution (in liter)

Where assumed values are:

Molarity of solution = 0.15 M

Given mass of potassium dichromate = 400. g

Molar mass of potassium dichromate = 294.15 g/mol

Volume solution in liter = x

i.e.

0.15 = 400/294.15*x

Volume of solution in liter = 400/294.15*0.15

Volume of solution in liter = 400/44.12

Volume of solution in liter = 9.06

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No, the physical constants of abuse substance do not depend on the mass of the sample used​.

Mass and volume are intimately correlated with density. In reality, it explains the precise nature of the connection between the two. By dividing the mass of an object by its volume, we may get its density. The mass is considered to have a low density if it has a high volume but a tiny mass.

By dividing a material's mass by its volume, one can get a material's density, which is defined as its mass per unit volume. Returning to the molecular level, the mass of a material's molecules and how tightly they are packed together determine the material's density.

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The balanced form of the chemical equation is as follows:

Na₂O + CaBr₂ → 2NaBr + CaO

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation is the same.

To balance a chemical equation, we make use of coefficients, which are numbers placed in front of the elements to make the atoms equal.

According to this question, sodium oxide reacts with calcium bromide as follows:

Na₂O + CaBr₂ → 2NaBr + CaO

The above equation is said to balanced because the following atoms are equal on both sides of the equation:

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Answer:octahedral coordination around Na + and Cl − centers. 

The number of significant figures in a result simply refers to the number of figures that are known with certainty. Here,

1000000 is 999999 rounded to three significant figures.

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The correct answer is option C: natural gas

The ingredient which is important in making plastics is natural gas.

Plastics are the refined form of natural gas, plant liquids, and crude oils.

Plastics can be manufactured in two ways: synthetic and biobased.

Synthetic plastics come from raw materials including natural gas, crude oil, and coal.

On the contrary, biobased plastics are manufactured from renewable materials such as starch, vegetable fats, oils, and carbohydrates.

However, the most common method of plastic manufacturing is the transformation of raw materials into refined propane and ethane.

In the next step, ethane and propane undergo cracking which transforms them into ethylene and propylene which are the building blocks of long chains of polymers.

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Answer:it's C

Explanation:

I just did it on Edge you're welcome Happy early Halloween you're beautiful and have a nice day. :)

Answer: Rb is more reactive

Explanation: The reason rubidium is more reactive is because it loses its valence electron more readily than Mg does.

Answer:

Rb

Explanation:

Mg has 2 valence electrons to loose vs Rb has 1 valence electron to loose.

Rb wins because losing 1 electron is easier than having to lose 2, which means Rb is more reactive ("ready" to react).

From the description, we can see that A and B is one wavelength thus the distance between the points is also 2 cm.

We can define the wavelength as the distance between two successive crests or the distance between two successive troughs. The crests are above the chart and the troughs are below the chart.

In this case, we have been asked to obtain the distance between A and B. Knowing that the points A and B are two successive crests and we have been told that the wavelength is 2 cm thus the distance between A and B is 2cm.

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The new concentration of hydroxide ions [OH-] is calculated as 1 x [tex]10^{-10}[/tex] M if the [[tex]H^{+}[/tex]] changed from [1 x [tex]10^{-7}[/tex]] to [1 x [tex]10^{-4}[/tex]] during the concentration change.

By “undoing” the common logarithm by exponentiating both sides with base 10 to obtain [[tex]H^{+}[/tex]] = 10pH.

You need to know the hydronium ion concentration in moles per litre to determine the pH of an aqueous solution (molarity). The formula pH = - log is then used to get the pH. [H3O+].

Concentration of [tex]H^{+}[/tex] ions = [[tex]H^{+}[/tex]] = 1 x [tex]10^{-7}[/tex]

When concentration of [[tex]H^{+}[/tex]] ions changed to 1  x [tex]10^{-4}[/tex] M

[[tex]H^{+}[/tex]] = 1 x  [tex]10^{-4}[/tex] M

The pH of the solution will further change to:

pH = -log [[tex]H^{+}[/tex]]' = -log [1 x [tex]10^{-4}[/tex]] = 4

pH + pOH = 14

pOH = 14 - 4 = 10

And we know that:

pOH = -log  [[tex]OH^{-}[/tex]]

10 = -log  [[tex]OH^{-}[/tex]]

[[tex]OH^{-}[/tex]] = 1 x   [tex]10^{-10}[/tex] M

If the pH of the solution is known, it is possible to compute the hydrogen ion concentration in a solution, [H+], in mol L-1.

The negative logarithm (to base 10) of the hydrogen ion concentration in mol L-1 is used to calculate pH. pH equals -log10[H+]

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The balanced equation of the reaction is:

The precipitate formed is magnesium hydroxide.

The mass of precipitate produced is 0.58 g.

The concentration of the ions remaining in the solution are:

[Mg²⁺] = 0.05 M

[NO₃⁻] = 0.1 M

The balanced equation of the reaction of aqueous potassium hydroxide and aqueous magnesium nitrate is given below:

2 KOH (aq) + Mg(NO₃)₂ ---> Mg(OH)₂ (s) + 2 KNO₃ (aq)

Magnesium hydroxide is obtained as a precipitate in the reaction above.

The mass of precipitate produced is calculated as follows:

moles of KOH (aq) reacting = 0.200 * 100 / 1000 = 0.02 moles

moles of Mg(NO₃)₂ reacting = 0.2 * 100 / 1000 = 0.02 moles

From the equation of reaction, KOH is the limiting reagent.

Moles of precipitate formed = 0.02 / 2 = 0.01 moles

molar mass of Mg(OH)₂ (s) = 58 g/mol

Mass of precipitate formed = 0.01 * 58

Mass of precipitate formed = 0.58 g

Moles of Mg(NO₃)₂ remaining = 0.02 - 0.01 = 0.01 moles

total volume of solution = 200 mL or 0.2 L

The concentration of each ion remaining in the solution is as follows:

[Mg²⁺] = 0.01 / 0.2 = 0.05 M

[NO₃⁻] = 0.01 * 2 / 0.2 = 0.1 M

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Answer:

Gravity

Explanation:

Gravity is the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.

Answer:

Gravity

Explanation:

Gravity is the force that attracts a person or an object to weigh, or pull. I hope this helped :)

The amount of water that we get from the large balloon is greater than the amount of water that we get from the small balloon.

We know that water is composed of hydrogen and oxygen. Let us recall that the ratio of the water and the oxygen that form the water molecule is fixed irrespective of the volume of the water that we use for the reaction.

If we compare if you ignited a very large balloon of hydrogen and oxygen instead of a very small balloon filled with the same reactants, we would notice that the amount of water that is formed from the large balloon of hydrogen and oxygen is greater than that produced from a very small balloon filled with the same reactants.

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Answer:

Cellular respiration is the process where cells break down glucose and then they convert it into energy. Cellular respiration is important because without cellular respiration there would not be any energy and without energy there would not be any food.