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3 years ago

A measure of the kinetic energy of particle motion within a substance is _____.

Chemistry

2 answers:

nasty-shy [4]3 years ago

6 0

Answer: Option (b) is the correct answer.

Explanation:

It is known that energy obtained by an object due to its motion is known as kinetic energy. Whereas an energy obtained by an object due to its position is known as potential energy.

For example, when water is heated then bond between its molecules starts to break and therefore, molecules start to move as they tend to gain kinetic energy due to increase in temperature.

Also, it is known that K.E = $\frac{3}{2}kT$

where k = boltzmann constant

T = temperature

Hence, kinetic energy is proportional to temperature. So, more is the increase in temperature more will be the increase in kinetic energy.

Thus, we can conclude that a measure of the kinetic energy of particle motion within a substance is temperature.

Irina18 [472]3 years ago

5 0

All particles (atoms and molecules) of matter have kinetic energy because they are always in motion.

A measure of the kinetic energy of particle motion within a substance is temperature. If the particles move faster, they have more kinetic energy, and the substance has a higher temperature

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Which of the following statements is not correct?

Pavlova-9 [17]

Answer: This option is incorrect: B. Covalent compounds are held together by much stronger interparticle forces than are ionic compounds.

Justification:

Ionic bonds, held by ionic compounds, are much stronger than covalent bonds, held by covalent compounds.

In ionic bonds one element yields one or more electrons forming a cation (a positively charged ion) and the other element accepts the electrons forming an anion (a negatively charged ion).

The anion and the cation are electrostatically atracted by each other. This electrostatic atraction force, named ionic bond, is very strong.

As result of this, the ionic compounds form strong crystals with high boiling and fusion points. A good example of this the sodium chloride, formed by the union of cation Na(+) and anion Cl(-).

The covalent bonds are result of sharing electrons and do not form ions. This bond is weaker than the ionic bond.

4 0

3 years ago

The free energy change for the following reaction at 25 °C, when [Cd2+] = 1.20 M and [Fe2+] = 1.40×10-3 M, is -23.9 kJ: Cd2+(1.2

vladimir2022 [97]

Answer:

It's spontaneous in the reverse direction

Explanation:

A negative voltage indicate s that the reverse reaction is spontaneous (i.e. oxidation at the cathode, and reduction at the anode; by convention you would need to swap the labels on the electrodes)

8 0

3 years ago

This reaction is sometimes used to inflate life rafts, weather balloons, and the like, where a simple, compact means of generati

tia_tia [17]

Answer: 10.2 grams

Explanation:

The balanced chemical reaction is :

$CaH_2(s)+2H_2O(l)\rightarrow Ca(OH)_2(aq)+2H_2(g)$

According to the ideal gas equation:

$PV=nRT$

P = Pressure of the gas = 740 torr = 0.97 atm (760torr=1atm)

V= Volume of the gas = 12.0 L

T= Temperature of the gas = 19°C = 292 K $0^0C=273K$

R= Gas constant = 0.0821 atmL/K mol

n= moles of gas

$n=\frac{PV}{RT}=\frac{0.97\times 12.0}{0.0821\times 292}$

$n=0.48$

According to stoichiometry:

2 moles of hydrogen are generated by = 1 mole of $CaH_2$

Thus 0.48 moles of hydrogen are generated by = $\frac{1}{2}\times 0.48=0.24$ moles of $CaH_2$

Mass of $CaH_2=moles\times {\text {Molar mass}}=0.24mol\times 42g/mol=10.2g$

Thus 10.2 grams of $CaH_2$ are needed to generate 12.0 L of hydrogen gas if the pressure of hydrogen is 740. torr at 19°C

5 0

3 years ago

Hydrogen bond is an example for? (PLEASE HELP!)

zlopas [31]

Answer:

Explanation:

hydrogen bond is a form of dipole-dipole interaction but with more unique properties

3 0

2 years ago

What is the total number of joules released when a 5.00-gram sample of water changes from liquid to solid at 0°C?

Marrrta [24]

Energy released from changing the phase of a substance from the liquid phase to solid phase can be calculated by using the specific latent heat of fusion. The heat of fusion of water at 0 degrees Celsius is 334 J/g. Calculation are as follows:

Energy = 5 grams x 334 J/g
Energy = 1670 J

4 0

2 years ago