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2 years ago

What is the organization that regulates the safety of Bluetooth and other wireless devices

Chemistry

1 answer:

Dimas [21]2 years ago

7 0

Answer:

The U.S. Federal Communications Commission (FCC)

Explanation:

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Which of the following ions would represent the ion of an element from Group 2 on the Periodic Table? A2+ Y3+ X2- Z+

Luba_88 [7]

A2+. Group 2 elements form cations with 2+ charge.

7 0

2 years ago

Avanti works in a bookstore. She has four books and is going to place them in two stacks. The diagram above shows the books befo

Feliz [49]

Answer:

Well they didn't transfer any energy when they weren’t touching and it did t produce any energy if it didn’t move. Since they are on top of each other they are causing momentum on each other creating kinetic energy

Explanation:

3 0

2 years ago

Acetylene gas, C2H2, can be produced by the reaction of calcium carbide and water. CaC2(s) + 2H2O(l) --> C2H2(g) + Ca(OH)2(aq

nekit [7.7K]

Answer:

1.0 L

Explanation:

Given that:-

Mass of $CaC_2$ = $2.54\ g$

Molar mass of $CaC_2$ = 64.099 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{2.54\ g}{64.099\ g/mol}$

$Moles_{CaC_2}= 0.0396\ mol$

According to the given reaction:-

$CaC_2_{(s)} + 2H_2O_{(l)}\rightarrow C_2H_2_{(g)} + Ca(OH)_2_{(aq)}$

1 mole of $CaC_2$ on reaction forms 1 mole of $C_2H_2$

0.0396 mole of $CaC_2$ on reaction forms 0.0396 mole of $C_2H_2$

Moles of $C_2H_2$ = 0.0396 moles

Considering ideal gas equation as:-

$PV=nRT$

where,

P = pressure of the gas = 742 mmHg

V = Volume of the gas = ?

T = Temperature of the gas = $26^oC=[26+273]K=299K$

R = Gas constant = $62.3637\text{ L.mmHg }mol^{-1}K^{-1}$

n = number of moles = 0.0396 moles

Putting values in above equation, we get:

$742mmHg\times V=0.0396 mole\times 62.3637\text{ L.mmHg }mol^{-1}K^{-1}\times 299K\\\\V=\frac{0.0396\times 62.3637\times 299}{742}\ L=1.0\ L$

<u>1.0 L of acetylene can be produced from 2.54 g $CaC_2$ .</u>

4 0

2 years ago

Calculate the eccentricity of an ellipse. The distance between the foci is 5.2 and the length of the major axis is 20.6.Round of

Dominik [7]

Answer:

The eccentricity of the ellipse is 0.252.

Explanation:

The eccentricity of an ellipse ( $c$ ), dimensionless, can be determined by means of the following expression:

$e = \frac{\bar c}{\bar a}$ (1)

Where:

$\bar c$ - Distance between the foci, dimensionless.

$\bar a$ - Length of the major axis, dimensionless.

If we know that $\bar c = 5.2$ and $\bar a = 20.6$ , then the eccentricity of the ellipse is:

$e = \frac{5.2}{20.6}$

$e = 0.252$

The eccentricity of the ellipse is 0.252.

8 0

3 years ago

What do I do if I am hopelessly crushing on someone and I know for a fact that they used to like me... But probably not anymore?

ikadub [295]

I feel the exact same way and what I would do is just try talking to them ,it may seem hard at first but try to start a conversation and maybe ask their friends about them or if they still like you

7 0

3 years ago

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