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4 years ago

I need to have a sentence with the word neap tide in it.

1 answer:

3 0

In the absence of neap tide transect data this hypothesis cannot be tested directly, but three pieces of indirect evidence weigh against it as a complete explanation.

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A constant-volume calorimeter was calibrated by carrying out a reaction known to release 3.50 kJ of heat in 0.200 L of solution

Dmitrij [34]

Answer:

The change in internal energy is - 1.19 kJ

Explanation:

Step 1: Data given

Heat released = 3.5 kJ

Volume calorimeter = 0.200 L

Heat release results in a 7.32 °C

Temperature rise for the next experiment = 2.49 °C

Step 2: Calculate Ccalorimeter

Qcal = ccal * ΔT ⇒ 3.50 kJ = Ccal *7.32 °C

Ccal = 3.50 kJ /7.32 °C = 0.478 kJ/°C

Step 3: Calculate energy released

Qcal = 0.478 kJ/°C *2.49 °C = 1.19 kJ

Step 4: Calculate change in internal energy

ΔU = Q + W W = 0 (no expansion)

Qreac = -Qcal = - 1.19 kJ

ΔU = - 1.19 kJ

The change in internal energy is - 1.19 kJ

4 0

4 years ago

For each compound below, identify any polar covalent bonds and indicate the direction of the dipole moment using the symbols 84

Lostsunrise [7]

Answer:

H+ ----- Br-

H+ ----- Cl-

O₋₋ -----2H++

CH3 ----- O- ------ H+

Explanation:

Dipole moment occurs when there is bonding between a very strong electronegative element and hydrogen atom.

Electronegative elements are the element which attract electrons towards themselves, (that is they have strong affinity for electrons).

Generally, group 7 elements (Fluorine, Chlorine, Bromine, Iodine) of the periodic table are highly electronegative

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3 0

3 years ago

In general what two classes of materials dissolve in water

Ivenika [448]

Polar covalent & Ionic are the two materials

3 0

4 years ago

During an oil spill, oil coats the surface of the water, endangering sea life. Why doesn’t oil dissolve in ocean water

alexgriva [62]

Water forms a covalent bond and oil forms a noncovalent bond

6 0

3 years ago

Which of the following best describes the molecular orbital theory of bonding? Choose one: A. A theory of bonding based on the m

trapecia [35]

Answer:

A. The molecular orbital theory of bonding is based on the mixing of atomic orbitals of similar shapes and energies to form molecular orbitals that extend to two or more atoms

Explanation:

When two atoms come close to each other, the waves of their atomic orbitals can interfere constructively or destructively, to form two new molecular orbitals that encompass the whole molecule.

B is wrong. It refers to Lewis structures.

C is wrong. It refers to VSEPR theory.

D is wrong. It refers to ionic bonding.

E. is wrong. It refers to valence bond theory.

8 0

4 years ago