For 10 points who do you know that the sun is made out of hydrogen and helium.
How would I explain it to a 3rd grader

( 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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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: 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).

A detailed description of the reaction steps, along with information on the relative order and cost of forming and breaking bonds, is called a reaction mechanism.

Information is an important stimulus for the recipient in some contexts. Records are entered and stored on a computer but are commonly referred to as statistics. The definition of statistics is news or know-how acquired or provided. A data instance is what is provided to a person requesting information about something. Statistics is a generalized concept that refers to something that has the power to speak. At its most essential level, facts represent the translation of the perceptible. Proper record keeping is believed to improve decision-making, complement productivity, and give employers a competitive advantage that knows more than their competitors. Use facts.

People use the information to find meaning in a variety of situations. Sometimes they use notes as a tool to do real things (eg, to gain abilities or achieve goals). In other cases, statistics are used for cognitive purposes (eg generating ideas).

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Answer: 69.25 AMU

Explanation:

1. find missing %

knowing the first % abundance is 55 you are left with 45%

2. set up an equation

(55% * 67) + (45% * 72) = x

3. solve

(55% * 67) + (45% * 72) =x | break down to solve each part

55% * 67 =36.85 | can be done many ways ex: (55 * 67)/100 or .55 * 67

45% * 72= 32.4| can be done as previously expressed

36.85+32.4=69.25 AMU

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

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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The average atomic mass of an element, which is shown in the element's box on most periodic tables, is the sum of the atomic masses of all its isotopes (at least, the isotopes that exist naturally). The average, nevertheless, is a weighted average.

The weighted average of an element's naturally occurring isotopes' atomic masses is that element's atomic mass.

The atomic mass is the average of the atomic masses of all the isotopes of a given element, weighted by their relative abundance in nature. Because various isotopes have different masses, it is a weighted average.

Due to its objectivity towards intermediate values and given average value, which most observations fall within, a weighted average is utilised. Furthermore, it is unaffected by extreme values or outliers. Outliers have an effect on the basic average.

Because there is no standard mass for an element, this is done.

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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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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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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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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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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°

Answer:

Filtration eg coffee maker

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:

Non-metals are brittle. ...

Non-metals are bad conductors of heat and electricity (except graphite).

Non-metals are non-lustrous (dull) and cannot be polished (except iodine).

Non-metals may be solids, liquids or gases at room temperature.

Non-metals are neither tough nor strong.

Thing in common of non- metals are :

The elements that absorb or gain electrons to get negative ions square measure referred to as non-metals. In their outmost shell, non-metals typically have four, 5, half dozen or seven electrons.

High inclination and high ionisation energies square measure characteristics of non-metals.

Because of these characteristics, non-metals ofttimes gain electrons after they move with different substances to make valence bonds.

Non-metals often have smaller atoms than do metals. The atomic sizes of non-metals determine a number of their other characteristics.

A high electronegativities are seen in non-metals. This indicates that non-metal atoms exhibit a significant propensity to attract more electrons than they would ordinarily have.

A high electronegativities are seen in non-metals. This indicates that non-metal atoms have a strong propensity to retain their existing electrons.

As opposed to non-metals, which can give up one or more electrons to metals relatively easily, metals can easily form positively charged ions and conduct electricity.

Very little electrical conductivity is displayed by non-metals.

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The equilibrium constant for the reaction at the given temperature is 273.03.

The equilibrium constant, Kc, for the reaction at the given temperature is calculated as follows:

Making an ICE table from the equation of the reaction and the given concentration values:

      H₂ (g) + I₂ (g) ⇌ 2 HI (g)

I      3.85     2.35        0

C     2.30    2.30     2 * 2.30

E      1.55    0.05      4.60

Kc =  [HI]² / [H₂] * [I₂]

Kc = (4.60)² / (1.55) * (0.05)

Kc = 273.03

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Complete question:

The following reaction was performed in a sealed vessel at 760 ∘C:

H₂ (g) + I₂ (g) ⇌ 2 HI (g)

Initially, only H₂ and I₂ were present at concentrations of [H₂] = 3.85M and [I₂] = 2.35M . The equilibrium concentration of I₂ is 0.0500 M .

What is the equilibrium constant, Kc, for the reaction at this temperature?

When more energy is needed than the calories that have been consumed to release energy from lipids stores throughout the body.

Calories are the unit of energy used by your body during food digestion and absorption. A meal might provide your body extra energy if it contains more calories. Your body stores extra calories as body fat if you eat more food than you need. Even foods without fat might have a significant number of calories.

The most effective way to burn calories is through aerobic exercise, which includes sports like swimming, cycling, and walking. Include at least 30 minutes of exercise each day as a general goal.

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Considering the definition of empirical formula, the empirical formula of the potassium salt is KNO₃.

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.

In this case, you know:

Assuming a 100 grams sample, the percentages match the grams in the sample. So you have:

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

Therefore the K: N: O mole ratio is 1: 1: 3

Finally, the empirical formula is K₁N₁O₃= KNO₃.

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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 reason why the  average atomic mass may not match that of any other group are;

1) Random errors in the measurement of mass

2) Differences that arise from the nature of samples used for the experiment.

The average atomic mass is the mass of the element that is obtained when you  consider the masses of all the isotopes that are found in the element as well as the percentage abundance of each of the isotopes.

Let us know that no two samples of the scandium element  would be exactly the same. The isotope percentages in each of the samples would not be the same. This means that the results that each group would obtain would slightly differ from each other.

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Answer:The answer would be crepuscular! I actually study fireflies as a living after school!

The purpose of the fourth pot that contained no fertilizer is to observe the actual growth of the plant without any fertilizers.

Fertilizers paintings by means of imparting vital vitamins to developing plants, bushes, and veg, as a form of multi-nutrition or meal substitute for the plant international. Many fertilizers additionally improve the way the soil works by helping it to maintain water higher and allowing air to drift freely, which is right for roots.

Fertilizers increase their growth via the application of fertilizer remedies. development in plant boom was notably discovered by means of the application of each natural and inorganic source of mineral vitamins.

The more fertilizer a crop gets, the faster it grows. We understand if a crop is supplied with too little fertilizer, plant increase response is negative; however if fertilizer charges are immoderate, plant increase slows and there is a potential for root harm or demise from high fertilizer salts.

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Heat causes a liquid's particles to gain more energy, which causes them to move more quickly and expand the liquid.

The heat energy used to boil the water is transmitted to the water molecules, which cause them to start moving more swiftly. The energy of the molecules eventually becomes too great for them to remain bound together as a liquid. This causes them to condense into gaseous water vapor molecules, which rise to the surface as bubbles as well as move through the air.

Thermal energy is the term used to describe the energy present in a system that determines its temperature. The movement of thermal energy is heat.

The particles in a liquid gain more energy as it is heated and travel more quickly, causing the liquid to expand. As the liquid becomes warmer, the surface's most energetic particles vaporize and flee.

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Explanation:

As the halogens become less reactive down the group, their oxidising ability decreases. Remember that oxidation is a gain of electrons. Halogens become less oxidising as you move down the group as it is more difficult to gain an electron.

the answer is no

Explanation:

the soaked potato is already immersed in water and is likely to get spoilt few days before the exposed potato.because a liquid medium has already been used. while the exposed potato still possesses its same properties as before

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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