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3 years ago

Can someone help with this please? My teacher isnt responding to any of mine or my classmates requests for help

Chemistry

2 answers:

sergiy2304 [10]3 years ago

6 0

Answer:

CO2 consists of individual molecules with one central carbon atom double bonded to two oxygen atoms. Silicon does not form double bonds with oxygen. CO2 is gas but SiO2 is a solid because SiO2 has a giant molecular structure. CO2 has a simple molecular structure, and because of this, CO2 is gas but SiO2 is solid at room temperature.

zepelin [54]3 years ago

6 0

Answer:

Explanation:

Because of their structure . Silica has a chain structure with e one silicon atom bonded to 4 oxygen atoms in the lattice. The structure is a long chain of tightly held atoms and this forms a solid.

The carbon dioxide molecule however as a linear structure and each oxygen atom is bonded by double bonds. These double bonds are not as strong as the Si - O bonds in silica so will not form a chain structure.

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An electromagnetic wave that has a lower frequency than infrared radiation will have ____ than the infrared radiation. longer wa

Monica [59]

Answer: longer wavelength and lower energy.

Explanation:

1) The wavelength is inversely related to the frequency. So, an electromagnetic wave with lower frequency will have longer wavelength.

This is the formula for electromagnetic waves:

λ = c / ν

where λ is the wavelength, c is the speed of light, and ν is the frequency.

2) Energy is directly related to the frequency.

This is the formula E = hν,

where E is the energy, h is Planck constant, and ν is the frequency.

So, the lower the frequency the lower the energy.

3) Conclusion:
<span>An electromagnetic wave that has a lower frequency than infrared radiation will have longer wavelength and lower energy than the infrared radiation</span>

6 0

3 years ago

Which of the following is a single replacement reaction?

IrinaK [193]

Answer:

Fe + 3NaBr → FeBr₃ + 3Na

Explanation:

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

Chemical equation:

Fe + 3NaBr → FeBr₃ + 3Na

This chemical equation shows the single replacement reaction. Iron replace the sodium and react with bromine.

All other options are incorrect because,

Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O

It is double replacement reaction.

CH₄ + 2O₂ → CO₂ + 2H₂O

This reaction equation shows combustion.

H₂O + CO₂ → H₂CO₃

This is synthesis reaction.

6 0

3 years ago

Read 2 more answers

How hot, in degrees Celsius, would the air inside the balloon have to get in order for the balloon to lift off the ground? Assum

SVETLANKA909090 [29]

Answer:

The temperature in degress Celsius is 52.25°C

Explanation:

According the equation:

$V(\rho _{a} -\rho _{t})g=mg\\\rho _{a} -\rho _{t}=\frac{n}{V} =\frac{340}{2950} =0.115kg/m^{3}$

$\rho _{t}=\rho _{a} -0.115=1.2-0.115=1.085kg/m^{3}$

The temperature is:

$T=\frac{P}{\rho _{t} R} =\frac{1.013x10^{5} }{1.085*287.05} =325.25K=52.25$ °C

3 0

3 years ago

We apply the same amount of energy to 10.0-g samples of aluminum, iron, and silver which begin at the same temperature.

maw [93]

Answer:

Explanation:

A sound knowledge of specific heat capacity of the metals is required in this case.

The specific heat capacity of a metal is the quantity of heat required to the raise the temperature of a unit mass of it by 1°C.

It is related to quantity of heat using the expression below;

H = m c Δt

where m is the mass

c is the specific heat capacity

Δt is the temperature change

let us make the specific the subject of the expression;

c = $\frac{H}{m x change in temperature}$

we can see that there is an inverse relationship between specific heat and temperature change.

The specific heat capacity of a body is an intensive property that is unique to the metal.

The higher the specific heat capacity, the lower the amount of temperature change in it.

Let us find the specific heat capacity of the given metals;

Aluminium 0.897J/gK

Iron 0.412J/gK

Silver 0.24J/gK

After the heat is supplied,

Silver > Iron > Aluminium in terms of temperature change

7 0

3 years ago

Which unit can be used to express solution concentration?

katrin2010 [14]

Answer:

mol/L

Explanation:

5 0

3 years ago