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3 years ago

Pls answer no robots

Chemistry

2 answers:

IrinaVladis [17]3 years ago

5 0

The dominant gene become one that had insulin and was dependent. And the ressesive became non insulin because those who had it could survive easier

lora16 [44]3 years ago

3 0

Genetic engineering improved the lives of individuals with insulin because it helps the body use the store sugar since people with diabetes can’t produce insulin.

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Which of the following values displays the pH of an acid? A. 3 B. 12

tester [92]

A pH of 7 or lower makes something an acid so it would be 3

3 0

3 years ago

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In a generic chemical reaction involving reactants A and B and products C and D, aA + bB → cC + dD, the standard enthalpy ΔH∘rxn

velikii [3]

Answer:

A. ΔH∘rxn = 21.9 KJ/mol

B. ΔH∘rxn = 103 KJ/mol

C. C2H5OH + 3O2 → 2CO2 + 3H2O

Explanation:

The standard reaction equation is given as:

aA + bB → cC + dD

Its standard enthalpy is given as:

ΔH∘rxn = cΔH∘f(C) + dΔH∘f(D) − aΔH∘f(A) − bΔH∘f(B)

Reaction given to us is:

H2O(l) + CCl4(l) → COCl2(g) + 2HCl(g)

So, its standard enthalpy will be:

ΔH∘rxn = (1)ΔH∘f(CoCl2 (g)) + (2)ΔH∘f(HCl(g)) − (1)ΔH∘f(H2O(l)) − (1)ΔH∘f(CCl4(l))

using the values from table:

ΔH∘rxn = - 218.8 KJ/mol + (2)(- 92.3 KJ/mol) - (- 285.8 KJ/mol) - (- 139.5 KJ/mol)

ΔH∘rxn = 21.9 KJ/mol

Reaction given to us is:

2A + B ⇌ 2C + 2D

So, its standard enthalpy will be:

ΔH∘rxn = (2)ΔH∘f(C) + (2)ΔH∘f(D) − (2)ΔH∘f(A) − (1)ΔH∘f(B)

using the values from table:

ΔH∘rxn = (2)181 KJ/mol + (2)(- 523 KJ/mol) - (2)(- 225 KJ/mol) - (- 337 KJ/mol)

ΔH∘rxn = 103 KJ/mol

Balanced equation for combustion of ethanol is:

C2H5OH + 3O2 → 2CO2 + 3H2O

3 0

3 years ago

HELP

Wittaler [7]

Answer:

Explanation:

Given parameters:

Number of moles of CaO = 0.22moles

Unknown:

Mass of CaO = ?

Solution:

Mass, number of moles and molar mass are related using the expression below;

Mass = number of moles x molar mass

Molar mass of CaO = 40 + 16 = 56g/mol

Insert the parameters and solve;

Mass = 0.22 x 56 = 12.32g

Given parameters:

Number of moles of NaCl = 0.83moles

Unknown:

mass of NaCl = ?

Solution:

Also,

Mass = number of moles x molar mass

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

Now insert the parameters and solve;

mass = 0.83 x 58.5

mass = 48.6g

Given parameters:

Number of moles of H₂SO₄ = 0.5moles

Unknown:

mass of H₂SO₄ = ?

Solution:

Mass = number of moles x molar mass

Molar mass of H₂SO₄ = 2(1) + 32 + 4(16) = 98g/mol

Insert the parameters and solve;

Mass = 0.5 x 98 = 49g

8 0

3 years ago

What cycloalkanes are present in a steroid ?

11Alexandr11 [23.1K]

Steroids are biologically very important compounds. They are made up of more that seventeen carbons. The structure of Steroid is comprised of a fused cycloalkane ring system. The simplest steroid and the main skeleton of all steroids is Gonane.

Gonane is made up of four cycloalkane rings i.e. tetracyclic hydrocarbon ring structure. Among these four rings 3 are cyclohexanes (designated as A, B and C) and one is cyclopentane (Designated as D). These four rings fuse to form a cyclopentaperhydrophenanthrene.

The Nucleus (Gonane) of steroids along with some derivatives are shown below,

3 0

3 years ago

Where do the OH- ions go as additional acid is added?

qwelly [4]

The result when the OH- ions go as additional acid is added is that they remain in solution but change concentration. This is because when you add more acid to hydroxide, it will change its concentration due to the acidity added.

8 0

3 years ago

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