Select the correct answer.
Which particles make up the nucleus of an atom?
A.
protons and electrons
B
neutrons and electrons
с.
protons only
D
protons and neutrons
E.
neutrons only

Answer:

[tex]n_{HCl}=0.2molHCl\\n_{H_2SO_4}=0.1molH_2SO_4[/tex]

Explanation:

Hello!

In this case, since the reactions between NaOH and the acids are:

[tex]NaOH+HCl\rightarrow NaCl+H_2O\\\\2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O[/tex]

Whereas we can see the 1:1 and 2:1 mole ratios between NaOH and HCl and H2SO4 respectively. In such a way, at the equivalence point we realize that:

[tex]n_{HCl}=n_{NaOH}=V_{NaOH}M_{NaOH}=0.01L*20mol/L=0.2molHCl\\\\2n_{H_2SO_4}=n_{NaOH}\\\\n_{H_2SO_4}=\frac{1}{2} V_{NaOH}M_{NaOH}=\frac{0.01L*20mol/L}{2} =0.1molH_2SO_4[/tex]

Best regards!

a. mol O₂=0.5

b. volume O₂ = 25 cm³

c. i. the total volume of the two reactants = 75 cm³

c. ii. the volume of nitrogen dioxide formed = 50 cm³

Reaction

2NO(gas) + O₂(gas) ⇒ 2NO₂ (gas)

a.

mol NO = 1

From the equation, mol ratio NO : O₂ = 2 : 1, so mol O₂ :

[tex]\tt \dfrac{1}{2}\times 1=0.5[/tex]

b.

From Avogadro's hypothesis, at the same temperature and pressure, the ratio of gas volume will be equal to the ratio of gas moles  

Because mol ratio NO : O₂ = 2 : 1, so volume O₂ :

[tex]\tt \dfrac{1}{2}\times 50~cm^3=25~cm^3[/tex]

c.

i. total volume of reactants : 25 cm³+ 50 cm³=75 cm³

ii. the volume of nitrogen dioxide formed :

mol ratio NO : NO₂ = 2 : 2, so volume NO₂ = volume NO = 50 cm³

Answer:

Barium chloride + Sodium phosphate    →   barium phosphate + sodium chloride

Explanation:

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AC +BD

Chemical equation:

BaCl₂ + Na₃PO₄         →     Ba₃(PO₄)₂ + NaCl

Balanced chemical equation:

3BaCl₂ + 2Na₃PO₄         →     Ba₃(PO₄)₂ + 6NaCl

The cation and anion of both reactants are exchanged with each other.

Ba²⁺ react with PO₄³⁻ and form Ba₃(PO₄)₂ while Cl⁻ react with Na⁺ and form sodium chloride.  

Molecular equation:

Barium chloride + Sodium phosphate    →   barium phosphate + sodium chloride

Answer:

58.0 g/mol

Explanation:

The reaction that takes place is:

First we calculate how many moles of silver chloride were produced, using its molar mass:

Then we convert AgCl moles into MCl₂ moles, using the stoichiometric ratio:

Now we calculate the molar mass of MCl₂, using the original mass of the sample:

We can write the molar mass of MCl₂ as:

Finally we calculate the molar mass of M:

The closest option is 58.0 g/mol.

Answer:

Avogadro's law (sometimes referred to as Avogadro's hypothesis or Avogadro's principle) is an experimental gas law relating the volume of a gas to the amount of substance of gas present.[1] The law is a specific case of the ideal gas law. A modern statement is:

Avogadro's law states that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules."[1]

For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.

The law is named after Amedeo Avogadro who, in 1812,[2][3] hypothesized that two given samples of an ideal gas, of the same volume and at the same temperature and pressure, contain the same number of molecules. As an example, equal volumes of molecular hydrogen and nitrogen contain the same number of molecules when they are at the same temperature and pressure, and observe ideal gas behavior. In practice, real gases show small deviations from the ideal behavior and the law holds only approximately, but is still a useful approximation for scientists.

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Answer:

Q = 100.42 J

Explanation:

Given data:

Mass of water = 1.500 g

Specific heat capacity of water = 4.184 J/g.°C

Heat required = ?

Initial temperature = 23°C

Final temperature = 39°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 39°C - 23°C

ΔT = 16°C

Q = 1.500 g× 4.184 J/g.°C  ×16°C

Q = 100.42 J

The total mass of the cylinder and the water is 47.431g.

According to this question, the mass of an empty graduated cylinder is 35.101 g.

A graduated cylinder is known to be an item of glass laboratory equipment consisting of a tall, narrow cylinder with a scale, or graduations marked up its length, which is used to measure liquids and solutions fairly accurately, but not precisely.

If 12.33 g of water is added to this cylinder, the total mass of the cylinder and the water that was added can be calculated as follows:

Total mass = 12.33g (water) + 35.101g (empty cylinder) = 47.431g

Therefore, the total mass of the cylinder and the water is 47.431g.

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Answer: 36.3 ml

Explanation:

According to the neutralization law,

[tex]n_1M_1V_1=n_2M_2V_2[/tex]

where,

[tex]n_1[/tex] = basicity [tex]H_2SO_4[/tex] = 2

[tex]M_1[/tex] = molarity of [tex]H_2SO_4[/tex] solution = 0.51 M

[tex]V_1[/tex] = volume of  [tex]H_2SO_4[/tex] solution = ?

[tex]n_2[/tex] = acidity of [tex]KOH[/tex] = 1

[tex]M_1[/tex] = molarity of [tex]KOH[/tex] solution = 0.36 M

[tex]V_1[/tex] = volume of  [tex]KOH[/tex] solution = 103 ml

Putting in the values we get:

[tex]2\times 0.51\times V_1=1\times 0.36\times 103[/tex]

[tex]V_1=36.3ml[/tex]

Therefore, volume of [tex]H_2SO_4[/tex] required is 36.3 ml

1 is true

2 is d 7

3 is

            1             e

            2             b

            3             d

            4             a

            5             c

Answer:

Sr(OH)₂(aq) + 2 HNO₃(aq) ⇒ Sr(NO₃)₂(aq) + 2 H₂O(l)

Explanation:

Let's consider the unbalanced molecular equation between strontium hydroxide and nitric acid solutions. This is a neutralization reaction, since an acid reacts with a base to form a salt and water.

Sr(OH)₂(aq) + HNO₃(aq) ⇒ Sr(NO₃)₂(aq) + H₂O(l)

We have 2 N atoms on the right side, so we have to multiply HNO₃ by 2.

Sr(OH)₂(aq) + 2 HNO₃(aq) ⇒ Sr(NO₃)₂(aq) + H₂O(l)

Finally, to get the balanced equation we will multiply H₂O by 2.

Sr(OH)₂(aq) + 2 HNO₃(aq) ⇒ Sr(NO₃)₂(aq) + 2 H₂O(l)

The balanced chemical equation can be given as:

[tex]\rm \bold{Sr(OH)_2\;+\;2\;HNO_3\;\rightarrow\;Sr(NO_3)_2\;+\;2\;H_2O}[/tex]

The reaction between strontium hydroxide and nitric acid has been the neutralization reaction. The reaction results in the formation of the salt along with the water molecules.

The reaction can be given as:

[tex]\rm Sr(OH)_2\;+\;HNO_3\;\rightarrow\;Sr(NO_3)_2\;+\;H_2O[/tex]

The balanced chemical equation has been the one in which the number of atoms of each element has been equal on both the product and the reactant side.

The balanced chemical equation can be given as:

[tex]\rm Sr(OH)_2\;+\;2\;HNO_3\;\rightarrow\;Sr(NO_3)_2\;+\;2\;H_2O[/tex]

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Answer : It’s C.

Cccccccccccccccccccccccccccccccccccccccc

The model of the chemical reaction that best represent the law of conservation of mass is the model with a balanced equation.

The correct answer to the question is the third option.

The statement above, suggest that unbalanced equation simply means matter has been created or destroyed.

Therefore, the correct answer to the question given above will be the option in which the equation is balanced.

The option with a balanced equation is the third option.

See attachment photo.

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Balanced equation :

3H₂+N₂⇒2NH₃

Equalization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:

1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.

2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product

3. Select the coefficient of the substance with the most complex chemical formula equal to 1

Unbalanced⇒the number of atoms from both sides (reactants and products) is not the same

H₂+N₂⇒NH₃

H=2(left), H=3(right)

N=2(left), N=1(right)

Balanced ⇒ the number of atoms from both sides (reactants and products) is equal

3H₂+N₂⇒2NH₃

H=3x2=6(left), H=2x3=6(right)

N=2(left), N=2x1=2(right)

Answer:

4.086 × 10⁻¹⁹ J

Explanation:

Step 1: Given and required data

Step 2: Convert "λ" to meters

We will use the conversion factor 1 m = 10⁹ nm.

486.0 nm × 1 m/10⁹ nm = 4.860 × 10⁻⁷ m

Step 3: Calculate the energy of one photon of this light

We will use the Planck-Einstein's relation.

E = h × c / λ

E = 6.626 × 10⁻³⁴ J.s × 2.997 × 10⁸ m/s / 4.860 × 10⁻⁷ m

E = 4.086 × 10⁻¹⁹ J

Answer:

The correct is the letter B

Answer:

C10H200

Explanation:

The molecular formula C10H20O (molar mass : 156.27 g/mol) may refer to: Citronellol. Decanal.

The molar mass of menthol ([tex]\rm C_10H_{20}O[/tex]) is 156.3 g/mol.

To calculate the molar mass of menthol ([tex]\rm C_10H_{20}O[/tex]), we need to determine the sum of the atomic masses of all the individual atoms in the compound.

The atomic masses of the elements are as follows:

C (carbon) = 12.01 g/mol

H (hydrogen) = 1.01 g/mol

O (oxygen) = 16.00 g/mol

Now, let's calculate the molar mass of menthol:

Molar mass of menthol = (10 * molar mass of C) + (20 * molar mass of H) + (1 * molar mass of O)

                      = (10 * 12.01 g/mol) + (20 * 1.01 g/mol) + (1 * 16.00 g/mol)

                      = 120.1 g/mol + 20.2 g/mol + 16.0 g/mol

                      = 156.3 g/mol

Therefore, the molar mass of menthol ([tex]\rm C_10H_{20}O[/tex]) is 156.3 g/mol.

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Answer:

okay....

Explanation:

technically, fish do not have wings. they are called fins and they are used for the purpose of transportation, just as legs are for humans.

~Ren

The number of moles of Ca(OH)2 formed is 4.33 moles.

Given,

number of moles of H₂O = 4.33

The balanced equation is :

CaO + H₂0 → Ca(OH)₂

From the balanced chemical reaction, we conclude that,

As 1 moles of H₂O  react with 1 mole of Ca(OH)₂

Then, 4.33 moles of H₂O will react with 4.33 moles of H₂O.

Thus, the number of moles of Ca(OH)₂ formed will be 4.33 moles.

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Answer:

paleontologist is the best i can say you

Answer:

C. The reaction rate at known reaction concentrations

Explanation:

The rate of a reaction is the measure of the speed of a chemical reaction. To find the rate constant of a reaction, the concentration of the reactants must be known.

Answer:

C. ApE x Approved

Explanation:

Trust

Answer: I think the answer is Cesium (Cs)

Explanation:

A half-filled 6s subshell would be 6s^1

Answer:

A, it is metal oxide

Answer:

When fossil fuels are burned carbon and hydrogen react with oxygen in air to carbon dioxide (CO2) and water (H2O). During this reaction heat is released which further amplifies the reaction. Electricity is generated by transforming mechanical energy (heat) to electrical energy in a turbine or generator.

Explanation:

Answer:

2451.9 ml

Explanation:

M1V1 = M2 V2

M1 = 5.1M

V1 = 125ml

M2=0.26M

V2= ?

V2= M1 V1/M2

V2 = 5.1*125/0.26

V2 = 2451.9 ml

Answer:

Try to go to quizzlet

Explanation:

Answer:

j

Explanation:

Answer: You should be able to find the answer on the internet

Answer:

The one with the greatest mass would be the one that has the most things in the nucleus, protons and nutrons

Explanation:

Answer:

none of these

Explanation:

The expression:

      P1/T1 = P2/T2 is a derivative of the combined gas law.

From the combination of the Boyle's and Charles's law, if the volume is taken to be constant, the pressure of the given mass of gas is directly proportional to the absolute temperature.

This is how the expression

      P1/T1 = P2/T2 was obtained.

Answer:

273 mL.

Explanation:

From the question given above, the following data were obtained:

Molarity of HBr = 0.220 M

Mole of HBr = 0.060 mole

Volume =?

Molarity is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is expressed as:

Molarity = mole /Volume

With the above formula, we can obtain the volume required as illustrated below:

Molarity of HBr = 0.220 M

Mole of HBr = 0.060 mole

Volume =?

Molarity = mole /Volume

0.220 = 0.060 / Volume

Cross multiply

0.220 × Volume = 0.060

Divide both side by 0.220

Volume = 0.060 / 0.220

Volume = 0.273 L

Finally, we shall convert 0.273 L to millilitres (mL). This can be obtained as follow:

1 L = 1000 mL

Therefore,

0.273 L = 0.273 L × 1000 mL / 1 L

0.273 L = 273 mL

Thus, 0.273 L is equivalent to 273 mL.

From the calculations made above, 273 mL of HBr is required.

The volume of 0.220 M HBr solution (in mL) required to obtain 0.060 moles of HBr is 272.7mL

From the question,

We are to determine the volume of 0.220M HBr solution that is required to obtain 0.060 moles of HBr.

To determine this, we will use the formula connecting number of moles, concentration and volume

From the formula,

Number of moles = Concentration × Volume

Then,

[tex]Volume = \frac{Number \ of \ moles}{Concentration}[/tex]

From the question,

Concentration of the HBr solution = 0.220 M

Required number of moles of HBr = 0.060 moles

∴ [tex]Volume \ of \ HBr \ required = \frac{0.060}{0.220}[/tex]

Volume of HBr required = 0.272727 L

Now, we will convert this to milliliter (mL)

(NOTE: 1L = 1000 mL)

∴ 0.272727 L = 0.272727 × 1000 mL

= 272.727 mL

≅ 272.7 mL

Hence, the volume of 0.220 M HBr solution (in mL) required to obtain 0.060 moles of HBr is 272.7mL

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Answer: omg this is so old! :D but its D!

Explanation:

The cells that has been composed of the indifferent number chromosomes as compared to other cells have been reproductive cells. Thus, option D is correct.

Cells have been the smallest and the unit of life. The cells have been composed of the pairs of chromosomes in higher organisms. There has been the presence of 46 chromosomes i.e. 23 pairs of chromosome. However, the chromosomes in the cell have been diploid i.e. in set of 2.

The reproductive cells have been resulted in the formation of the new cells. So they have been consisted of the cells with the half the number of chromosomes and are haploid in nature.

Thus, the cells that have different number of chromosomes as compared to the other cells have been reproductive cells. Thus, option D is correct.

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