CHEMISTRY HIGH SCHOOL

Which is true about covalent compounds?Have a high melting point

Conduct electricity when dissolved in water

Have a low boiling point

Are extremely hard

Answers

Answer 1
Answer: Covalent compounds have a low boiling point. All the other answers apply to ionic compounds.
Answer 2
Answer: Covalent compounds have a low boiling point. 

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For a cell whose potential is -0.46 v with 3 moles of electrons exchanged, what is DG?DG = -nFE°cella.) -133 kJb.) +133 kJc.) +133,170 kJd.) -6.65 x 10^-3
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The metric unit of force is theA. newton.
B. kilogram.
C. gram.
D. nanometer.

Answers

(The answer is A.newton) For example, the SI unit of force, the newton, is defined to be the force that accelerates a mass of one kilogram at the rate of one meter per second per second. This means the newton is equal to one kilogram meter per second squared, so the algebraic relationship is N = kg.

What two-step process separated the cans into aluminum, steel, and tin?

Answers

Answer:

Magnet

Durability and heaviness.(texture)

Explanation:

Magnet can be use to separate Aluminum from mixture of steel and aluminum.

Though aluminum and steel look alike but magnet can be use to separate it.

If the can attract the magnet or magnet stick to the can, it is a steel can. Aluminum does not stick to magnet.

A mixture of Aluminum and tin can also be separated by magnet.

Tin attract magnet but tin is more durable, heavy and does not corrode easily.

When u touch the three cans, tin is heavy and durable.

Neptunium's only naturally occurring isotope, 23793np, decays by emitting one alpha particle, one beta particle, and one gamma ray. What is the new atom formed from this decay?

Answers

The given isotope of Neptunium is ^(237) _(93) Np

Alpha decay of an isotope results in daughter nuclide with mass number less by 4 units and atomic number less by 2 units than the parent isotope.

Alpha decay of Neptunium-237 can be represented as:

^(237) _(93) Np-->^(233)_(91) Pa+^(4) _(2) He

Beta decay of the above formed protactinium nuclide can be represented as:

^(233)_(91)Pa-->^(233) _(92) U+^(0)_(-1)e

Gamma decay releases only energy in the form of gamma rays, the nuclide remains the same.

^(233)_(92)U-->^(233)_(92)U+γ

The new atom formed after the given decays is ^(233)_(92)U

What is the difference between an exothermic and an endothermic reaction?A. Endothermic reactions absorb heat.

B. Exothermic reactions absorb heat.

C. There are no changes in heat during either reaction.

D. Endothermic reactions release heat.

Answers

answer D

Explanation:hope thhis helped

A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m? Show all of the work needed to solve this problem.

Answers

The freezing point constant means that the temperature depression when adding one mole of the solute. The mole number of the solute is 10.20/180=0.0567 mol. So the answer is 1.86*0.0567=0.105 ℃.

10.20 g C6H12O6 x (1 mole C6H12O6 / 180 g C6H12O6) = 0.0567 mole C6H12O6

Then convert grams of water to kilograms of water by dividing by 1000.  

355 g / 1000 = .355 Kg of H2O

molality (m) = (0.0567 mole C6H12O6 / .355 Kg of H2O) = 0.160 m  

Then plug it in to the formula Δtf = Kfm

Δtf = (-1.86 °C/m) x (0.160 m)  

Δtf = -0.298 °C

What is the total amount of heat required to vaporize 1.00 gram of H2O(g) at 100.0C and 1 atmosphere?(1) 4.18 J(2) 334 J(3) 373 J(4) 2260 J

Answers

for this you will need the latent heat capacity for the vaporization of water. 
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