CHEMISTRY HIGH SCHOOL

What is the total number of electron pairs that are shared between the two carbon atoms in a molecule of ethyne?(1) 1 (3) 3
(2) 2 (4) 4

Answers

Answer 1

Answer:

Answer : The correct option is, (3) 3

Explanation :

The given molecule is, Ethyne

As we know that ethyne is an unsaturated hydrocarbon which contains triple bonds between the carbon-carbon atoms.

In unsaturated compounds, there are less number of hydrogen bonded with the carbon atoms.

The formula of ethyne molecule is, $C_2H_2$ . In this molecule, there are triple bond is present between the two carbon atoms that means there are 3 pair of electrons present between the two carbon atoms.

Hence, there are 3 number of electron pairs that are shared between the two carbon atoms in a molecule of ethyne.

The structure of ethyne are shown below.

Answer 2

Answer: The total number of electron pairs that are shared between the two carbon atoms in a molecule of ethyne is 3.

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Which of the following is an exothermic reaction?A.) dissolving sugar in water

B.) melting ice

C.) condensing steam

D.) dissolving ammonium nitrate in water

Answers

Answer:

C.) condensing steam

Explanation:

Exothermic reactions are chemical reaction which energy is released to the environment in the form of heat . The overall energy of the reactant is greater than the energy of the product. The higher in energy of the reactant causes a release of heat to the environment. In exothermic reactions, enthalpy change is usually negative and is accompanied by the loss of energy in the form of heat or light.

Condensation is the change of water vapor to liquid . The conversion is an exothermic reaction as energy is release to the environment in the form of heat. The water vapor molecules has higher energy than liquid. The changes of water vapor to liquid causes a loss in energy of the water vapor. As the water vapor loss more energy, heat is been release to the surrounding.

All other reaction are endothermic in which heat is absorb from the environment except for condensation of steam.

The event that is an example of an exothermic reaction is condensing steam. The answer is letter C. An exothermic reaction is one in which there is a release of heat during the reaction. Dissolving sugar in water, melting ice and dissolving ammonium nitrate in water are all examples of an endothermic reaction.

How many moles of mgci2 are there in 332 g of the compound

Answers

find molar mass of MgCl2 so M=95.211 g/mol
N=m/M
N=332/95.2
N=3.487
dont forget to round your sig figs

In terms of the sequence of the scientific method what is the immediate purpose of doing an experiment?

Answers

The correct answer should be something like gathering data or similar.

You conduct experiments to test a hypothesis and then gather the data and analyze it to see whether the hypothesis is correct.

Answer:

gathering data

Explanation:

When you do an experiment you want to gather information to make a conclusion on your hypothesis.......-

during a canoe race, a camper paddles a distance of 406 meters in 70 seconds. what's the average speed of the race?

Answers

Answer:

Average speed of the racer is 5.8 m/s.

Explanation:

Total distance covered by racer = D = 406 m

Total time taken racer= T = 70 seconds

The formula of an average speed is given by:

Average speed :

$=\frac{\text{Total distance covered}}{\text{Total time taken}}=(D)/(T)$

Average speed of the racer is:

$=(406 m)/(70 seconds)=5.8 m/s$

speed= distance/time
5.8 m/s=406/70

1km = 100m
1h= 3600s
(5.8m/s)(1km/100m)(3600s/1h)

The element mercury was first discovered on the Sun.
a. True
b. False

Answers

This statement is FALSE. Mercury was not first discovered in the sun. In fact, mercury or quicksilver was discovered by ancient Indians and Chinese even before 2000 BC. Its ores that are called cinnabar are used in traditional Chinese medicines. However, the effectiveness is not yet justified because of the toxicity of the element. Mercury is also used with thermometers both in clinical and lab uses. Nowadays, the use of it in thermometers is gradually disappearing because of its harmful properties.

The average kinetic energy of water molecules is greatest in which of these samples?(1) 10 g of water at 35°C(2) 10 g of water at 55°C(3) 100 g of water at 25°C(4) 100 g of water at 45°C

Answers

Answer : The correct option is, (2) 10 g of water at 55°C

Explanation :

Average kinetic energy of the gas particle is directly proportional to the temperature of the gas particle.

Formula used :

$K.E=(3)/(2)(RT)/(N_A)$

where,

R = Gas constant

T = temperature

$N_A$ = Avogadro's number

From this we conclude that the kinetic energy is directly proportional to the temperature where 'R' and $N_A$ are constant. That means kinetic energy depends only on the temperature not on the mass.

(Higher the temperature, higher will be the kinetic energy)

Hence, the average kinetic energy of water molecules is greatest in 10 g of water at 55°C.

Final answer:

The sample with the highest average kinetic energy of water molecules is (2) 10 g of water at 55°C.

Explanation:

Kinetic energy is a fundamental concept in physics that describes the energy an object possesses due to its motion. It depends on both an object's mass and its velocity. Objects in motion have kinetic energy, and the faster they move or the more massive they are, the greater their kinetic energy. This energy can be transferred or transformed but is always conserved in a closed system.

The average kinetic energy of water molecules depends on the temperature of the water. The higher the temperature, the greater the average kinetic energy. In this case, the sample with the highest average kinetic energy would be (2) 10 g of water at 55°C. This sample has a higher temperature than the other options, therefore, the water molecules in this sample have the highest average kinetic energy.