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3 years ago

How do countries with different currencies trade goods with each other?

Chemistry

1 answer:

8090 [49]3 years ago

6 0

Answer:

D- They use the exchange rate to convert one's Country's currency to another's

Explanation:

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What is the molarity of a solution which contains 0.80 mol of HCl in 250mL of solution?

mariarad [96]

Answer:

3.2M HCl Solution

Explanation:

Molarity = moles of solute / volume of solution expressed in liters

moles of solute = 0.80 moles HCl

volume of solution = 250 ml = 0.250 Liter

Molarity (M) = 0.80 moles HCl / 0.250 Liters = 3.2M HCl Solution

6 0

3 years ago

What protein molecules does DNA wrap around to form a nucleosome

Delvig [45]

Answer:

Histone proteins.

Explanation:

Histones are known as the special type of proteins which are +ve charged and low molecular in weight. They are highly basic proteins and containing basic amino acids such as arginine and lysine. Histones are +ve charged proteins and DNA is -ve charged in nature, due to the presence of phosphate groups in DNA backbone, histones bind with DNA very tightly and form a complex known as Nucleosome.

The Nucleosome is known as the fundamental unit of DNA packaging which is composed of an Octameric core of histone proteins (two each of histones H2A, H2B, H3, and H4) around which the double helix of DNA is wrapped.

4 0

3 years ago

The formation constant for the following reaction is Kf = 5.6 108 at 25°C. Ni2+(aq) + 6 NH3(aq) Ni(NH3)62+(aq) (a) Determine G0

marusya05 [52]

Answer:

a. ΔG⁰ = -49.9 kJ/mol

b. The reaction proceeds towards right direction

c. ΔG = 49.5 kJ/mol

d. The reaction proceeds towards left direction

Explanation:

a. It is possible to obtain ΔG⁰ from K reaction using:

ΔG⁰ = -RT ln K

Where R is gas constant 8.314 J/molK, T is absolute temperature (273.15 +25 = 298.15K)

Replacing:

ΔG⁰ = -8.314 J/molK 298.15K ln 5.6x10⁸

ΔG⁰ = -49.9 kJ/mol

b. Reaction quotient Q, defines concentrations of substances involved in an equilibrium, when Q = Kf, the reaction is in equilibrium, when Q < Kf the reaction moves towards right direction and vice versa.

At standard-state concentrations, Q = 1, as:

Q < Kf, the reaction proceeds towards right direction

c. ΔG = ΔG⁰ + RT ln Q

Q = [Ni(NH₃)₆²⁺] / [NH₃]⁶[Ni²⁺]

Q = 0.017M / 0.0015M⁶×0.0058M

Q = 2.6x10¹⁷

ΔG = -49.9 kJ/mol + 8.314x10⁻³ kJ/molK 298.15K ln 2.6x10¹⁷

ΔG = 49.5 kJ/mol

d. As Q > Kf, the reaction proceeds towards left direction

7 0

3 years ago

In the solubility lab, sugar was the _____________ and water was the _______________.

Rasek [7]

In a homogenous mixture, sugar was the solute and water was the solvent. Solubility is the maximum amount of a solute that dissolves in a given amount of solvent at a constant temperature. Solutes are more soluble in a given solvent at higher temperatures. Therefore, when temperature increases, the solubility of the solute also increases.

Moreover, the solubility of the substance ranges from infinitely soluble such as alcohol in water, to poorly soluble like silver chloride in water and the species that dissolves, the solute, can be another liquid, gas or a solid.

4 0

3 years ago

Answer the following questions for this equation: 2 H2 + O2 --> 2 H2O

laiz [17]

Answer:

1 Mole O₂ / 2 Mole H₂O

Explanation:

The balance chemical equation for the synthesis of water is as follow,

2 H₂ + O₂ → 2 H₂O

In this equation the moles are specified by the coefficients i.e.

2 moles of H₂ reacting with 1 mole of O₂

2 moles of H₂ producing 2 moles of H₂O

1 mole of O₂ producing 2 moles of H₂O

Hence the molar ratio for O₂ and H₂O can be written as,

1 Mole O₂ : 2 Mole H₂O

or,

1 Mole O₂ / 2 Mole H₂O

5 0

3 years ago