Number of electrons for all of these even the ones with a number by them ? Will give brainlist!!!!

Answer:

[tex]2HNO_2(aq)+Ca(OH)_2(aq)\rightarrow H_2O(l)+Ca(NO_2)_2(aq)[/tex]

Explanation:

Hello.

In this case, considering that the reaction between nitrous acid and calcium hydroxide yield both water and calcium nitrite as a neutralization chemical reaction:

[tex]HNO_2(aq)+Ca(OH)_2(aq)\rightarrow H_2O(l)+Ca(NO_2)_2(aq)[/tex]

As it is not balanced due to the two nitrites at the right, we obtain:

[tex]2HNO_2(aq)+Ca(OH)_2(aq)\rightarrow H_2O(l)+Ca(NO_2)_2(aq)[/tex]

Which means that 2 before the nitrous acid balance both nitrogen and oxygen.

Regards.

Answer:

1.8 moles of H20

Explanation:

The balanced equation gives you the ratio of moles.

so you then have to say the number of moles of the substance you have multiplied by the the ratio of what you are looking for to what you have.

The ratio should be written in the form of a/b (fraction)

0.90 moles of H₂O are formed from 0.60 moles of C₂H₆.

From the balanced equation, we can see that the stoichiometric ratio between C₂H₆ and H₂O is 2:6. This means that for every 2 moles of C₂H₆ reacted, 6 moles of H₂O are formed.

Given that we have 0.60 moles of C₂H₆, we can use this ratio to calculate the corresponding moles of H₂O.

(0.60 moles C₂H₆) x (6 moles H₂O / 2 moles C₂H₆) = 1.80 moles H₂O

Therefore, 0.60 moles of C₂H₆ will produce 1.80 moles of H₂O according to the stoichiometry of the balanced equation.

However, it's worth noting that the given balanced equation doesn't match the stoichiometry usually seen for the combustion of ethane (C₂H₆). The typical balanced equation for the complete combustion of ethane is:

C₂H₆ + 7/2 O₂ -> 2 CO₂ + 3 H₂O

In this case, 0.60 moles of C₂H₆ would produce 0.90 moles of H₂O according to the stoichiometry of the balanced equation.

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The oceans are fundamental because provide oxygen, climate regulation, and food and medicines.

The term ocean resources make reference to the sources of energy and materials obtained from the ocean.

The ocean produces more than 50% oxygen we can breathe from the air and also absorbs carbon dioxide.

The ocean is also fundamental in climate regulation to dissipate heat from the equator to the North and South poles.

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Answer:

I believe your answer would be Perio

Explanation:

Answer:

Periods :)

Explanation:

I dont know if thats what youre asking but thats what theyre called, there isnt another name

Given the two different titration reactions, the volume of NaOH required to reach the equivalence point of both reaction will be different.

Balanced equation

HNO₃ + NaOH —> NaNO₃ + H₂O

From the balanced equation above,

MaVa / MbVb = nA / nB

(1 × 10) / (1 × Vb) = 1

10 / Vb = 1

Cross multiply

1 × Vb = 10

Vb = 10 mL

Balanced equation

H₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O

From the balanced equation above,

MaVa / MbVb = nA / nB

(1 × 10) / (1 × Vb) = 1/2

10 / Vb = 1/2

Cross multiply

1 × Vb = 10 × 2

Vb = 20 mL

From the above calculations, we can conclude that different volume of NaOH will be required for the different reaction.

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Answer:

salt water

Explanation:

i learned from makeing slime

Answer:

C: Chlorine

Explanation:

Answer:

[tex]Molecular \: mass \: of \: C _{2}H _{4} O_{2}.2H_{2}O , \\ \\ ⇢ 12 \times 2 + 4 \times 1 + 16 \times 2 + 2(2 \times 1 + 16) \\ \\⇢ 24 + 4 + 32 + 36 \\ \\ ⇢ 96g[/tex]

[tex]\bold\pink{Percentage \: of \: substance \: in \: compound ,} \\ \\ \bold\pink{ ⇢ \frac{mass \: of \: substance}{mass \: of \: compound \times 100}}[/tex]

[tex]\%\:age \: of \: water \: (H_{2}O) = \frac{36}{96} \times 100 \\ \\ ⇢ 0.375 \: \times 100 \\ \\\fbox\red{\: ⇢ 37.5\%\:}[/tex]

hope helpful ~

Answer: Thx brother!

Explanation: He let me have points!

Answer:

31815

Explanation:

did it on a calculator lol

Answer:

23 atoms

Explanation:

Krypton (Kr) exists naturally as a mixture of six isotopes with atomic number of 36. These six isotopes occupy different percentages of the mixture. Below is a list of the isotopes and there percentage in a given mixture

1) Krypton-78 (⁷⁸Kr) ⇒ 0.35%

2) Krypton-80 (⁸⁰Kr) ⇒ 2.25%

3) Krypton-82 (⁸²Kr) ⇒ 11.6%

4) Krypton-83 (⁸³Kr) ⇒ 11.5%

5) Krypton-84 (⁸⁴Kr) ⇒ 57%

6) Krypton-86 (⁸⁶Kr) ⇒ 17.3%

To determine the amount of ⁸³Kr present in a mixture of 200 atoms of krypton, you will multiply the it's percentage of occurrence in nature by the amount of atoms in a given mixture

11.5/100 × 200 = 23 atoms

Hence, there should be 23 atoms of krypton-83 in the mixture of 200 atoms of Krypton.

Answer:

moringa tree has seeds that have unique properties towards water purification

Explanation:

the seeds of moringa tree have an extract which can separate unwanted particulates from the water sediment impurities.

they have the

anti-microbial treatment potentials

moringa also has various vitamins since it is a plant tissue

Answer:

Explanation:

Molar weight of HCl is 36.46g/mole

The reaction requires 0.73 g of HCl so it requires

0.73/36.46 = 0.02 mole of HCl

Molarity of HCl is 4.0M = 4mole/liter

0.02/4 = 0.005L = 5mL

5 mL of HCl solution should be used.

Answer:

no

Explanation:

The key difference between atomic mass and average atomic mass is that the atomic mass is the mass of an atom, whereas the average atomic mass is the mass of an atom of a particular chemical element calculated by considering isotopes of that element.

Answer: A, inductive Reasoning

Explanation: I got the answer right on my homeschooling program, the rest are all wrong

Answer:

:)

Explanation:

Answer:

Explanation:

The reaction that is described goes as follows:

2AgCl + Mg(OH)2 ---> MgCl2 + 2AgOH

The precipitate here is the MgCl2 salt.

I hope it helped!

hello ; i don't understand your answer Explanation:

Answer:

[tex]\huge\boxed{\sf 6x}[/tex]

Explanation:

[tex]\sf x+ 2x + 3x\\\\Take\ x\ common\\\\x(1+2+3)\\\\x(6)\\\\\bold{6x}\\\\ \rule[225]{225}{2}[/tex]

Hope this helped!

Answer:D

Explanation:I think

Answer:

balanced............

The statement, that describes when nitrogen is liquefied, heat is released is "it is true because heat is released when a gas changes to a liquid."

Heat is used to release energy in some chemical reactions. In other words, they radiate heat into the environment.

The energy generated when a gas condenses to a liquid is known as latent heat of condensation. Condensation is the transformation of a gas into a liquid.

When steam is cooled, it releases thermal energy and transforms into a liquid. This is known as condensation.

Heat must be removed in the given statement to transform gaseous nitrogen to liquid nitrogen.

Hence the correct option is C.

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The enthalpy of combustion of C to produce is mathematically given as

dHo rxn = -110.5 KJ

Question Parameters:

the combustion of C to produce CO2(g) is -393.5 kJ/mol

the reaction of CO to produce CO2 is -283.0 kJ/mol

Hess's law states that during a chemical reaction any change in the enthalpy of a chemical reaction is identical nonetheless, not regarding if the reaction takes place in one step or several steps, so far we have similar final and the initial states.

Generally, the equation for the reaction 3  is mathematically given as

reaction 3 = +1 * (reaction 1) -1 * (reaction 2)

Therefore

dHo rxn = +1 * (-393.5) -1 * (-283.0)

dHo rxn = -110.5 KJ

In conclusion, the enthalpy of combustion is

dHo rxn = -110.5 KJ

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Don't look in the comments

Answer: Carbon is the only element listed. Carbon Dioxide consists of Carbon AND Oxygen x2 so this is a compound. As stated earlier, air is a mixture of compounds. Water is another compound consisting of Hydrogen x2 and Oxygen.

Explanation: pls give brainliest thanks!

An element is made up of atoms with the same atomic number.

Carbon is the only element listed.

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metallic characteristics:

lustrous

solid at room temperature

in-between characteristics:

amphoteric

semiconducting

nonmetallic:

brittle

Explanation:

i took the instruction got then right :)

The metallic characteristics are lustrous, solid at room temperature

The in-between characteristics are amphoteric and semiconducting.

The nonmetallic characteristics is brittle.

The elements whose properties are intermediate of metals and non-metals is called metalloid.

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The molecular shape of a Cl₂CO molecule is (E) Bent. Option E

Cl₂CO, which is also called carbonyl chloride or phosgene, is a molecule made up of one carbon atom (C), two chlorine atoms (Cl), and one oxygen atom (O) attached to the carbon atom. The Lewis structure of  Cl₂CO shows that the oxygen atom has two sets of unshared electrons. This makes the molecule have a curved shape.

The reason why  Cl₂CO has a bent shape is because the lone pairs on the oxygen atom push the bonded atoms away more than the shared pairs of electrons. Because of this, the two Cl atoms move closer to each other. This causes the bond angle to be less than 180 degrees and makes the molecule have a bent shape.

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Answer:

The concentration of KOH solution is 17.009 moles/litre or 17.009M .

Explanation:

Here , the given reaction is -

[tex]2KOH +H_{2}SO_{4}$\rightarrow$K_{2}SO_{4}+2H_{2}O[/tex]

 2moles of KOH requires 1mole for complete neutralisation.

Therefore ,

2 x number of moles of KOH = 1 x number of moles of [tex]H_{2}SO_{4}[/tex]

2 x (molarity of KOH x volume of KOH) = (Molarity of [tex]H_{2}SO_{4}[/tex] x volume of

[tex]H_{2}SO_{4}[/tex])

1 mole of [tex]OH^- $\rightarrow$[/tex] 1mole of [tex]H^+[/tex]

Molarity (KOH) = concentration (c)

volume (KOH) =15.05ML

Molarity ([tex]H_{2}SO_{4}[/tex] ) = 5.0 M

Volume of ( [tex]H_{2}SO_{4}[/tex] ) = 25.6ML

[tex]\frac{1\times(C \times15.05ml)}{OH^-} = \frac{(2\times 25.6 \times 5)}{H^+}[/tex]

C = [tex]\frac{0.2\times25.6\times5}{15.05}[/tex]

C= 17.009 moles/litre

Hence , the concentration of KOH solution is 17.009 M or moles/litre .

Answer:

Increasing the temperature

Partial pressure is the pressure exhibited by a single gas when present alone in a system. According to Le's principle, the partial pressure of B can be raised by increasing temperature. Thus, option C is correct.

Le's principle states the shift in the position of the equilibrium when the reaction system is disturbed by some factors. The pressure, temperature, and concentration are the factors that affect the equilibria of the reaction mixture.

According to the ideal gas equation and Le's principle, the pressure of the system directly depends on the temperature. As the temperature of the system is raised the partial pressure of the reactant (B) will increase, and the reaction will move in the forward direction.

Therefore, the increase in the temperature increases the partial pressure of the gas.

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Answer:

The density of beryllium is 1.85 g/cm³. Thus given metal is beryllium.

Explanation:

Given data:

Mass of metal = 37 g

Volume of metal = 20cm³

Which metal is this = ?

Solution:

We will solve this problem by using density formula. After finding density we will check from literature which metal has a density similar to our calculated density.

d = m/v

d = 37 g/ 20cm³

d = 1.85 g/cm³

The density of beryllium is 1.85 g/cm³. Thus given metal is beryllium.