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3 years ago

Can someone please help me !!- It would mean a lot ❤️

Chemistry

2 answers:

Reptile [31]3 years ago

6 0

_______________________________

<h2 /><h2 /><h2>Kendall</h2>

If something is heretic, it refers to certain characteristics that is coded in our DNA. In science we know that this is possible through understanding the workings of the chromosomes & their functions.

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MrRissso [65]3 years ago

6 0

B. Carla is correct.

Why? - is the passing on of traits from parents to their offspring; either through asexual reproduction or sexual reproduction, the offspring cells or organisms acquire the genetic information of their parents. Heredity is the passage of genetic information from one generation to another. For offspring to inherit traitsthere must be a reliable mechanism for transferring genetic information from one generation to the next.

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Nitrogen from a mixture of nitrogen and oxgen

vivado [14]

Oxygen - nitrogen gas mixture is a colorless odorless gas. Both oxygen and nitrogen are noncombustible; however, oxygen can accelerate the burning of a fire. Under prolonged exposure to fire or intense heat the containers may rupture violently and rocket.

3 0

2 years ago

Read 2 more answers

Write a mechanism (using curved-arrow notation) for the deprotonation of tannins in base. Use Ar-OH as a generic form of a tanni

Reika [66]

Answer:

After deprotonation of tannin, tannin (Ar-OH) is converted to $Ar-O^{-}Na^{+}$ salt which is soluble in water and $CO_{3}^{2-}$ is converted to $HCO_{3}^{-}Na^{+}$ which is also soluble in water

Explanation:

Sodium carbonate is a strong electrolyte which produces carbonate anion upon dissociation.
Carbonate ion is a strong conjugate base of weak acid $HCO_{3}^{-}$
After deprotonation of tannin, tannin (Ar-OH) is converted to $Ar-O^{-}Na^{+}$ salt which is soluble in water and $CO_{3}^{2-}$ is converted to $HCO_{3}^{-}Na^{+}$ which is also soluble in water
Balanced equation: $Ar-OH+Na_{2}CO_{3}\rightarrow Ar-O^{-}Na^{+}+Na^{+}HCO_{3}^{-}$
Mechanism has been shown below.

7 0

3 years ago

What is the potential energy of 25kg rock sitting on the cliff with a height of 230m?

My name is Ann [436]

Answer:

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

PE = 25 × 10 × 230 = 57,500

We have the final answer as

Hope this helps you

5 0

2 years ago

Based on the activity series provided, which reactants will form products? f > cl > br > i cui2 br2 right arrow. cl2 al

dimaraw [331]

The reactants that will form products will be $2CuI_2 + Br2$ .

<h3>Activity series</h3>

Elements at higher positions in the activity series will be able to displace those in lower positions in solutions.

Thus:

$2CuI_2 + Br2 --- > 2CuBr +2 I_2$ because Br is higher than I in the activity series.

Cl cannot displace F in $Cl2 + AlF_3$ because F is higher than Cl in the activity series.

Also, Cl is higher than Br in the activity series, thus, the reaction $Br_2 + NaCl$ cannot form products.

I cannot displace F, thus, $CuF_2 + I_2$ cannot form products.

More on activity series can be found here: brainly.com/question/13934381

#SPJ1

5 0

1 year ago

Acetonitrile (CH3CN) is a polar organic solvent that dissolves a wide range of solutes, including many salts. The density of a 1

erastovalidia [21]

Answer:

a. [LiBr] = 2.70 m

b. Xm for LiBr = 0.1

c. 81% by mass CH₃CN

Explanation:

Solvent → Acetonitrile (CH₃CN)

Solute → LiBr, lithium bromide

We convert the moles of solute to mass → 1.80 mol . 86.84 g/1 mol = 156.3 g

This mass of solute is contained in 1L of solution

1 L = 1000 mL → 1mL = 1cm³

We determine solution mass by density

Solution density = Solution mass / Solution volume

Solution density . Solution volume = solution mass

0.824 g/cm³ . 1000 cm³ = 824 g

Mass of solution = 824 g (solvent + solute)

Mass of solute = 156.3 g

Mass of solvent = 824 g - 156.3 g = 667.7 g

Molality → Moles of solute in 1kg of solvent

We convert the mass of solvent from g to kg → 667.7 g . 1kg /1000g = 0.667 kg

Mol/kg → 1.80 mol / 0.667 kg = 2.70 m → molality

Mole fraction → Mole of solute / Total moles (moles solute + moles solvent)

Moles of solvent → 667.7 g . 1mol/ 41g = 16.3 moles

Total moles = 16.3 + 1.8 = 18.1

Mole fraction Li Br → 1.80 moles / 18.1 moles = 0.1

Mass percentage → (Mass of solvent, <u>in this case</u> / Total mass) . 100

<u>We were asked for the acetonitrile</u> → (667.7 g / 824 g) . 100 = 81%

3 0

2 years ago