VSEPR theory is a model for predicting

Which of the substances in the chart has the least density?

3241004551 [841]

Answer:
Option-D (Piece of Wood) is the correct answer.

Explanation:
Density is related to mass and volume as,

Density = Mass / Volume
For Wood,
Density = 42.5 / 50

Density = 0.85

You can calculate remaining densities by yourself. Among all the density of Piece of Wood is the least.

3 0

3 years ago

The air inside a bicycle tire pump has 27 joules of heat conducted away from while 77.9 joules of work done are being done on it

tatyana61 [14]

Answer:

51 J

Explanation:

The air inside a bicycle tire pump has 27 joules of heat conducted away. By convention, when heat is released, it takes the negative sign, so Q = -27 J.

77.9 joules of work done are being done on the air inside a bicycle tire pump. By convention, when work is being done on the system, it takes the positive sign, so W = 77.9 J

We can calculate the change in the internal energy (ΔU) using the following expression.

ΔU = Q + W

ΔU = (-27 J) + 77.9 J

ΔU = 51 J

7 0

4 years ago

What does this even mean? Help please and thank you!

bezimeni [28]

Answer:

T₁ = P₁V₁T₂ / P₂V₂

Explanation:

The combine gas equation is given by:

P₁V₁ / T₁ = P₂V₂ / T₂

Where:

P₁ => is the initial pressure

V₁ => is the initial volume

T₁ => is the initial temperature

P₂ => is the final pressure

V₂ => is the final volume

T₂ => is the final temperature

Finally, we shall make T₁ the subject of the above expression. This can be obtained as follow:

P₁V₁ / T₁ = P₂V₂ / T₂

Cross multiply

T₁P₂V₂ = P₁V₁T₂

Divide both side by P₂V₂

T₁ = P₁V₁T₂ / P₂V₂

Thus, the formula for T₁ is:

T₁ = P₁V₁T₂ / P₂V₂

4 0

3 years ago

Which displacement reaction is most likely to occur? Use the resources to help you. A. BaCl2 + Ca → CaCl2 + Ba B. BaCl2 + Sr → S

umka2103 [35]

Correct part is C.

Explanation: This question can be easily explained with the help of reactivity series.

The metal which lies below in the reactivity series CANNOT displace the metal which lies above it. Similarly if the metal lies above in the reactivity series, it CAN displace the metal lying low in the series.

In A part, the reaction follows

$BaCl_2+ Ca\rightarrow CaCl_2+Ba$

Here Ca metal lies low in the series than Ba, therefore it cannot displace Ba metal in the reaction.

In B part ,the reaction follows

$BaCl_2+Sr\rightarrow SrCl_2+Ba$

Here also Sr metal lies low in the series, therefore it cannot displace Ba.

In C part, the reaction follows

$BaCl_2+2Na\rightarrow 2NaCl+Ba$

Here Na metal lies above in the series than Ba, therefore it can easily displace Ba in the reaction and will lead to form NaCl as a product.

In D part, the reaction follows

$BaCl_2+Mg\rightarrow MgCl_2+Ba$

Here Mg lies low in the series, therefore it cannot displace Ba in the reaction.

You can use the image attached.

6 0

4 years ago

The change in entropy of 20.0 moles of ideal monatomic constant volume gas as it changes from an initial temperature 300 K to it

Gre4nikov [31]

Answer:

668.9K is the final temperature

Explanation:

The change in entropy, ΔS, of an ideal monoatomic gas is obtained using the equation:

ΔS = n*Cv*ln (T2/T1)

<em>Where ΔS is change in entropy = 200J/K</em>

<em>n are moles = 20.0mol</em>

Cv is 3/2R for an ideal monoatomic gas (3/2*8.314J/molK)

T2 is final Temperature and T1 initial temperature = 300K

Replacing:

ΔS = n*Cv*ln (T2/T1)

200J/K = 20.0mol*3/2 *8.314J/molK*ln (T2/300K)

0.80186 = ln (T2/300K)

2.23 = T2 / 300K

<h3>668.9K is the final temperature</h3>

7 0

3 years ago