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3 years ago

PLEASE HELP ASAPAHHH

Chemistry

2 answers:

Yanka [14]3 years ago

4 0

Answer:

if the oil is already 60 c and you heat up the hot plate to the same degree you are not changing anything

hope this helps :)

LenKa [72]3 years ago

4 0

Answer:

There is more olive oil than canola oil, so if she uses the same temperature to heat the olive oil as she did to heat the canola oil. The outcome of the answer. I could be wrong im trying my best!

Explanation:

Conduction is heat transfer through touch (physical contact between molecules). The hotter molecules are, the faster they move around and transfer their energy to other molecules. Convection is heat transfer through fluid flow, like when hot water is poured over ice or when cool air is blown over your warm soup. Radiation occurs when an object releases heat in the form of electromagnetic rays.

An object’s heat capacity describes the amount of heat required to change the temperature of that object by a certain amount. Specific heat is the amount of heat required to change the temperature of a substance by one degree (generally °C).

Liquids absorb heat in different ways. The temperature change in a particular liquid heated by conduction may not be the same trend of temperature change for the same liquid heated by radiation.

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At 20 °C the vapor pressure of pure benzene (C6H6) is 75.0 torr, and that of toluene (C7H8) is 22.0 torr. Assume that benzene an

8090 [49]

Answer:

mole fraction benzene = 0.62

mole fraction toluene = 0.38

Explanation:

Raoults law for ideal solutions tells us that the totoal vapor pressure of the solution will be given by adding the partial pressures of the components of the solution and the partial pressures are simply given by the product of the component in solution times its pure vapor pressure at the temperature given:

<h2>p total = x₁ P⁰₁ + x₂ P⁰₂</h2>

where x1 and x2 for this solution denote the mole fractions of benzene and toluene and p⁰ ₁, p⁰₂ the vapor pressures of benzene and toluene respectively.

Solving the algebraic equation:

75 x₁ + 22 x₂ = 55

75 x₁ + 22 ( 1- x₁) = 55 (since x₁ + x₂ = 1)

75 x₁ + 22 - 22 x₁ = 55

53 x₁ = 33

x₁ = 0.62

x₂ = 1 - 0.62 = 0.38

6 0

3 years ago

20. Which of the following is a method of purifying water? A. Adding iodine B. Freezing C. Aeration D. Fixation

Oxana [17]

The answer is A, adding Iodine

7 0

3 years ago

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Hydrochloric acid and sodium hydroxide will produce which two compounds

wel

They cancel each other out so they are neutral.

5 0

3 years ago

Which ligand binds the tightest? Ligand A, with a Kd of 10^-9M Ligand B, with a Kd of 10^-3M Ligand C, with a percent occupancy

padilas [110]

To answer this item, we must take note that the ligand that binds the tightest is the one with the lowest dissociation constant, Kd. Kd's for both A and B are already given so, we only need to solve Kds for C and D.
Kd of C
0.3 = (1x10⁻⁶)/(1x10⁻⁶ + Kd) ; Kd = 2.3x10⁻⁶
Kd of D
0.8 = (1x10⁻⁹)/(1x10⁻⁹ + Kd) ; Kd = 2.5x10⁻10
Since Ligand D has the least value of dissociation constant then, it can be concluded that it binds the tightest.

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3 years ago

Which one of the following molecules is polar? Showallworkindetails. A) BH3 B) CCl4 C) SO2 D) CO2 E) PF5

Darya [45]

Answer:

C) SO₂

Explanation:

The figure below shows — clockwise from the upper left — BH₃, CCl₄, SO₂. CO₂, and PCl₅.

You must draw the Lewis structures of the molecules and then use VSEPR theory to figure out their molecular shape.

A) BH₃

BH₃ has a trigonal planar geometry.

It is nonpolar because of symmetry.

The bond dipole of the vertical B-H bond balances the equal and opposite resultant of the two downward-pointing B-H bonds.

BH₃ is nonpolar.

B) CCl₄

CCl₄ has a tetrahedral geometry.

The resultant of the two C-Cl bond dipoles on the right balances the equal and opposite resultant of the two C-Cl bond dipoles on the right.

CCl₄ is nonpolar.

C) SO₂

The Lewis structure shows that the central S atom has two S=O double bonds and a lone pair.

The electron pair geometry is trigonal planar and the molecular geometry is bent.

There is a net resultant of the S=O bond dipoles.

SO₂ is polar.

D) CO₂

CO₂ has a linear geometry with two C=O bonds pointing in opposite directions.

The bond dipoles cancel, so

CO₂ is nonpolar.

E) PCl₅

PCl₅ has a trigonal bipyramidal geometry.

The axial P-Cl bond dipoles cancel, as do the equatorial trigonal planar ones.

PCl₅ is nonpolar.

4 0

4 years ago