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3 years ago

Approximately how much more energy is released in a 6.5 richter magnitude earthquake than in one with magnitude 5.5?

2 answers:

8 0

c. 30 times The Richter scale is a logarithmic scale for the energy release during an earth quake. For every increase by 1 in magnitude, the energy released is about 31.6 times larger. So calculate the magnitude difference by subtracting. 6.5 - 5.5 = 1.0 And then multiply by 31.6, giving 31.6. And since we're just looking for approximate values, select the answer that's closest which is option "c. 30 times"

Elanso [62]3 years ago

4 0

Answer: (C) 30 times

Richter scale is used to determine the magnitude of an earthquake from the arrival time of P and S waves. It determines the total amount of energy released during an earthquake.
If Richter magnitude scale measures 6.5 then it produces 30 times more energy than 1 Richter scale magnitude during an earthquake. The magnitude of an earthquake is plotted on a logarithmic scale from 1 to 9 and increases 10 folds by one magnitude. If 6.5 is the magnitude, it means it is 10 times more than 5.5 magnitude earthquake. Similarly the amount of energy is calculated as 30 folds. So 6.5 magnitude will have 30 folds more energy released than that with 5.5 magnitude earthquake.

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If we add 22.5 g of HCl to 45.8 g of water, what is the percent by mass of HCl in the solution?

kifflom [539]

Answer:

$\%m/m=33.0\%$

Explanation:

Hello there!

In this case, since the percent by mass of a solute in a solution is computed via the following division:

$\%m/m=\frac{m_{solute}}{m_{solute}+m_{solvent}} *100\%$

Next, given the mass of HCl and that of water, we plug them in to obtain:

$\%m/m=\frac{22.5g}{22.5g+45.8g} *100\%\\\\\%m/m=33.0\%$

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7 0

3 years ago

True or false: This balanced equation shows the combustion of ethane: 2C2H6 + 7O2 → 4CO2 + 6H2O

MakcuM [25]

2C2H6 + 7O2 → 4CO2 + 6H2O

C2H6 is ethane,

Ethane reacts with oxygen, so it is the combustion.

The equation is balanced.

Answer is True.

5 0

4 years ago

Ammonium perchlorate (NH,CIO) is the solid rocket fuel used by the U.S. Space Shuttle. It reacts with itself to produce nitrogen

meriva

Answer: The mass of oxygen gas produced is 2.4 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of ammonium perchlorate = 8.84 g

Molar mass of ammonium perchlorate = 117.5 g/mol

Putting values in equation 1, we get:

$\text{Moles of ammonium perchlorate}=\frac{8.84g}{117.5g/mol}=0.0752mol$

The chemical equation for the decomposition of ammonium perchlorate follows:

$2NH_4ClO_4\rightarrow N_2+Cl_2+2O_2+4H_2O$

By Stoichiometry of the reaction:

2 moles of ammonium perchlorate produces 2 moles of oxygen gas.

So, 0.0752 moles of ammonium perchlorate will produce = $\frac{2}{2}\times 0.0752=0.0752mol$ of oxygen gas

Now, calculating the mass of oxygen gas from equation 1, we get:

Molar mass of oxygen gas = 32 g/mol

Moles of oxygen gas = 0.0752 moles

Putting values in equation 1, we get:

$0.0752mol=\frac{\text{Mass of oxygen gas}}{32g/mol}\\\\\text{Mass of oxygen gas}=(0.0752mol\times 32g/mol)=2.4g$

Hence, the mass of oxygen gas produced is 2.4 grams

7 0

3 years ago

An electromagnetic wave has a wavelength of 0.12 meters. what is that in nanometers?

tino4ka555 [31]

Answer:

1.2 × 10⁸ m

Explanation:

You want to convert metres to nanometres.

Recall that the multiplying prefix nano- means × 10⁻⁹, so

1 nm = 1 × 10⁻⁹ m

The conversion factor is either $\frac{\text{1 nm} }{10^{-9} \text{m}}$ or $\frac{10^{-9} \text{m} }{\text{1 nm}}$ .

You choose the one that has the desired units (nm) on top. Then

$\lambda = \text{0.12 m} \times \frac{\text{1 nm} }{10^{-9} \text{m}} = 1.2 \times 10^{8} \text{ nm}$

7 0

3 years ago

In a certain city, electricity costs $0.13 per kW·h. What is the annual cost for electricity to power a lamp-post for 5.50 hours

My name is Ann [436]

We know power=work done/time taken
power*time= work
100watt=0.1kw
total work in a day= power* time
0.1*5.5=0.55kwh
for 1 year total.energy is 0.55*365=200.75kwh
cost is 200.75*0.13=26.0975dollars
for 25 watt it is 0.025*5.5*365*0.13=6.524375 dollars

3 0

4 years ago