Which pair of elements is both malleable and able to conduct heat?

Which of the following types of molecules always has a dipole moment? Linear molecules with two identical bonds. Trigonal pyrami

natali 33 [55]

Answer:

Trigonal pyramid molecules (three identical bonds)

Explanation:

In trigonal pyramidal molecule like molecule of ammonia , the vector some of intra- molecular dipole moment is not zero because the bonds are not symmetrically oriented . In other molecules , bonds are symmetrically oriented in space so the vector sum of all the internal dipole moment vectors cancel each other to make total dipole moment zero.

8 0

4 years ago

What is the median number of seeds that germinate at 32

Alex17521 [72]

Answer:65

Explanation:

6 0

3 years ago

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Write a balanced equilibrium equation for the dissolution of nai in water. include phases.

Bess [88]

Dissolution means to make the compound apart, So when we have ionic compounds like NaI which has metal and non-metal ions, It separates into parts of positive ions and negative ions. After we separate this compound apart we will put the charge of each on above its symbol and then start to balance the equation of the dissolution.

So the dissolution equation of NaI is:
NaI(s) → Na^+(s) + I^-(Aqu)

3 0

3 years ago

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A researcher was attempting to quantify the amount of dichlorodiphenyltrichloroethane (DDT) in spinach with gas chromatography u

devlian [24]

Answer:

0.0136mg DDT / g spinach

Explanation:

Quantification in chromatography by internal standard has as formula:

RF = Aanalyte×Cstd / Astd×Canalyte (1)

Where RF is response factor, A is area and C is concentration

Replacing with first experiment values:

RF = 5019×3.20mg/L / 8179×6.37mg/L

RF = 0.308

In the next experiment, final concentration of chloroform was:

11.45mg/L × (1.25mL / 25.00mL) = 0.5725mg/L

From (1), it is possible to write:

Aanalyte×Cstd / Astd×RF = Canalyte

Replacing:

6821×0.5725mg/L / 14061×0.308 = Canalyte

Canalyte = 0.9017mg/L

as the sample was made from 0.750mL of extract. Concentration of extract is:

0.9017mg/L × (25.00mL / 0.750mL) = 30.06mg/L. As the extract has a volume of 2.40mL:

30.06mg/L × 2.40x10⁻³L = 0.07213mg of DDT in the extract

As the extract was made from 5.29g of spinach:

0.07213mg of DDT in the extract / 5.29g spinach = 0.0136mg DDT / g spinach

5 0

4 years ago

Under certain circumstances, glycolysis takes place anaerobically, in the absence of oxygen. When this happens, which of the fol

Neko [114]

Answer:

A. Lactate for muscular cells B. Ethanol for yeast

Explanation:

Lactate or lactic acid is produced for muscular cells in absence of oxygen. That is the reason because people fell pain in muscles after an physical activity. Ethanol is produced for yeast in absence of oxygen. The glycolysis goal is produce energy in ATP form. When oxygen is available, energy production is more efficient than oxygen is absence.

I hope my answer has been helpful

7 0

4 years ago