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Given :

Initial concentration of nitric acid, [tex]C_1 = 16\ M[/tex].

Final concentration of nitric acid, [tex]C_2 = 0.250 \ M[/tex].

Volume of [tex]HNO_3[/tex], [tex]V _2= 500\ mL = 0.5\ L .[/tex]

To Find :

Volume needed( [tex]V_1[/tex] ).

Solution :

We know,

[tex]C_1V_1 =C_2V_2\\\\16 \times V_1 = 0.250 \times 0.5 \\\\V_1 = \dfrac{0.250 \times 0.5}{16}\\\\V_1 = 0.0078125\ L = 7.8125 \ mL[/tex]

Hence, this is the required solution.

Answer:

group. hfdzybidddiklllnjjooolll

Answer:

An organ system

Explanation:

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Answer:

a) Elements listed in rows on the periodic table are in the same family - false

Explanation:

Elements listed in groups /columns on the periodic table are in the same family.

The false statement is:

a) Elements listed in rows on the periodic table are in the same family.

In a periodic table, the elements are arranged in increasing order of atomic number. There are 7 periods and 18 groups in a periodic table.

The statement which is false is:

a) Elements listed in rows on the periodic table are in the same family.

The correct statement will be:

a) Elements listed in rows on the periodic table belongs to a different family.

These elements will have different properties and thus placed in periodic table.

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Answer:

Hella false

Explanation:

big cap.

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Answer:

This is the tendency for particles in suspension to settle out of fluid in which they are contained and come to rest against a barrier.

Explanation:

In sedimentation, the particles are in a fluid and under the influence of forces , for example, gravitational forces, they settle and then come to rest when faced with a barrier.

The settling process is the process in which the particles fall out of liquid and sedimentation is the end of the process.

Answer:

it is the unit of Force

Explanation:

force is equal to Newton

Answer:

moles of Ba²⁺ : 0.97 mol

Moles of OH⁻ : 1.94 mol

Explanation:

Given data:

Mass of Ba(OH)₂ = 165.5 g

Moles of barium ions = ?

Moles of hydroxide ion = ?

Solution:

Number of moles of barium hydroxide:

Number of moles = mass/molar mass

Number of moles = 165.5 g/ 171.34 g/mol

Number of moles = 0.97 mol

one mole of barium hydroxide contain one mole of Ba²⁺ and 2 mole of OH⁻ ion.

Thus in 0.97 moles of barium hydroxide,

moles of Ba²⁺ :

0.97 mol × 1 = 0.97 mol

Moles of OH⁻ :

0.97 mol × 2=  1.94 mol

Answer:

Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons (or electron density). An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. The higher the associated electronegativity, the more an atom or a substituent group attracts electrons.

Answer:

24. B

25. B

26. B

Explanation:

24. As depicted in the image attached, all living organisms including animals undergo cellular respiration, which is the process whereby sugar molecule is broken down to release energy (ATP). In this process, CARBON DIOXIDE (CO2) is released as a product. The equation is as follows:

C6H12O6 + 6O2 → 6CO2 + 6H2O + energy

On the other hand, plants undergo a unique process called photosynthesis in order to synthesize their food (sugars) and hereby release oxygen gas in the process. Based on the diagram in option B, plants release oxygen using CO2, while animals release CO2 using O2.

25. The structure depicted in the image of this question is an organelle called MITOCHONDRIA. The mitochondrion is the site of cellular respiration (Krebs cycle and ETC) in eukaryotic cells.

26. Photosynthesis is a metabolic process unique to the cells of autotrophic organisms like green plants. It is the process where they synthesize their food in form of organic molecules using SUNLIGHT as a source of energy.

6CO2 + 6H2O + sunlight → C6H12O6 + 6O2

Answer:

2KClO₃  →  2KCl  +   3O₂

Explanation:

The unbalanced expression is given as:

      KClO₃  →  KCl  +   O₂

The reaction equation above is unbalanced and we need to choose between the numbers 2,3,4 and 5 to finally the correct expression that will obey the law of conservation of mass.

       aKClO₃  →  bKCl  +   cO₂

Let a, b and c be the numbers that will balance the expression;

Conserving K;

         a  = b

Conserving Cl;

          a = b

 Conserving O;

           3a  = 2c

let a = 1, b  = 1  and c  = [tex]\frac{3}{2}[/tex] multiply through by 2;

     a  = 2, b  = 2 and c  = 3

So, the balance expression insert;

                      2KClO₃  →  2KCl  +   3O₂

Answer:

1. an incomplete octet is an valence shell that is not fully stable since it doesn't have 8 electrons

2.an odd electron molecule is a molecule that has an odd number of electrons but is still stable

3. there are extra electrons in an expanded octet because the molecules' central atoms make extra bonds that don't comply with the octet rule.

Explanation:

Answer:

1.02 L.

Explanation:

For this problem, you have to apply one of the gas laws --Charles' Law. It is as follows: V1/T1 = V2/T2. Substituting the values in and using sig figs, we get 1.02 L.

Answer:

1.02

Explanation:

Answer:

They all contain sone hydrogen atoms.

Explanation:

H is hydrogen doi

Answer:

D. It is extremely reactive.​

Explanation:

Hello!

In this case, since potassium is an alkali metal, it is known those are extremely reactive because the energy required to ionize them is very low, it means they react so easily. For instance, even in the presence of water, potassium is able to react and form a purple flame as a product of the reaction:

[tex]2K+2H_2O\rightarrow 2KOH+H_2[/tex]

As well as potassium, the rest of the elements belonging to the alkali metals series are extremely reactive; therefore the answer is D. It is extremely reactive.​

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Answer:

I need this too but nobody knows how :(

Explanation:

Answer:

12*2= 24

Mg 24 is twice heavier than carbon

Explanation:

The atomic mass of one carbon 12 atom = 12 g/mol

Relative atomic mass [tex](A_{r})[/tex] of an element is the mass of one of its atoms relative to 1/12 the mass of one atom of carbon-12.

Relative atomic mass [tex](A_{r})[/tex] is given by the formula

[tex](A_{r})[/tex] = (Average mass of an atom ×12)/(mass of one atom of carbon-12)

From the question, x is twice heavier as one carbon 12 atom

∴ mass of x = 2 × 12 g/mol

mass of x = 24 g/mol

Then, the relative atomic mass of elements x​ is calculated thus

[tex]A_{r}= \frac{24gmol^{-1} \times 12}{12 gmol^{-1} }[/tex]

[tex]A_{r} = 24 \\[/tex]

Hence, the relative atomic mass of elements x​ is 24.

(NOTE: Relative atomic mass is unitless)

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Answer:

A

Explanation:

The question is incomplete, the complete question is;

An unknown compound has the following chemical formula:  

N2Ox  

where x stands for a whole number.  

Measurements also show that a certain sample of the unknown compound contains 3.7 mol of oxygen and 2.45 mol of nitrogen.  

Write the complete chemical formula for the unknown compound.

Answer:

The complete formula of the compound is N2O3.

Explanation:

Given;

Number of moles of N = 2.45 moles

Number of moles of O = 3.7 moles

Chemical formula of unknown compound = N2Ox

From the ratio of the number of moles of N to O;

2/x = 2.45/3.7

2 * 3.7 = x * 2.45

x = 2 * 3.7/ 2.45

x =3

Hence the complete formula of the compound is N2O3.

Answer:

1 and 2

Explanation:

The given equation is:

        Cl₂  +  H₂   →   2HCl

A coefficient is the variable or number before a chemical specie.

In this reaction Cl₂ and H₂ are the reactants;

  The coefficient of Cl₂ is 1,

                                   H₂ is 1,

                                  HCl is 2

The subscript is the number to the lower power after a chemical specie is denoted.

    For Cl₂, it is 2

A number before a chemical atom or molecule is called a coefficient. The coefficient of chlorine is one (1), and its subscript is two (2).

A subscript is a number or symbol written at the bottom right of the chemical atom or the molecule in a compound.

The balanced chemical reaction is shown as:

[tex]\rm Cl_{2} + H_{2} \rightarrow 2HCl[/tex]

The coefficient in chlorine is 1, hydrogen is 1, and hydrochloric acid is 2. The subscript in chlorine gas is 2, and hydrogen gas is 2.

Therefore, the coefficient is 1, and the subscript is 2.

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Answer:b

Explanation:

Answer:

to make it basic from acidic

Answer:

i think 12 moles of CO2 will be produced

Answer:

Number of moles of HCl = 0.17 mol

Explanation:

Given data:

Volume of solution = 347 mL

Molarity of solution = 0.48 M

Number of moles of HCl present = ?

Solution:

Formula:

Molarity = number of moles of HCl / volume in L

Volume in L:

347 mL× 1L / 1000 mL

0.347 L

by putting values in formula:

0.48 mol/L = number of moles / 0.347 L

Number of moles = 0.48 mol/L × 0.347 L

Number of moles = 0.17 mol

Answer:

the answer to this question is option A mark me as brainliest

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Answer:

A is condensation

B  is Conduction

C is erosion

D is radiation

E is deposition

Explanation:

Answer:

Screenshot

Explanation:

A cylinder of argon gas contains 50.0 L of  Ar  at 18.4 atm and 127 °C. How many moles of argon are in the cylinder?

Number moles of Argon : 28.03

Given

The volume of gas=50 L

P = 18.4 atm

T = 127+273=400 K

Required

moles of Argon

Solution

Use ideal gas Law :

[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{18.4\times 50}{0.08205\times 400}\\\\n=28.03[/tex]

Answer:

B

Explanation:

Protons are located in the nucleus, which takes out c

Electrons are in specific shells, so b is the answer

Answer:

may involve a change in total mass

involve very high-energy changes

involve changes in nuclides when decay occurs

Explanation:

A nuclear reaction is different from a typical chemical reaction. The reaction occurs within the nucleus and involved nuclear materials.