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3 years ago

What natural resource did the Mesopotamians use to protect their cities from floods?

Chemistry

2 answers:

Zielflug [23.3K]3 years ago

7 0

Answer:

mud bricks.

Explanation:

pickupchik [31]3 years ago

5 0

Answer: Mud Bricks

Explanation: Fertile Crescent has important natural resources that encourage settlement including Mud

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The final marks in a statistics course are normally distributed with a mean of 70 and a standard deviation of 10. The professor

Alinara [238K]

Use inversenormal on a calculator and type in .1 , 70 , 10 . That percent is for A and will determine at what mark an A will be. Do the same for the rest of the grades but change the first argument in the calculation

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3 years ago

A student tested a sample of carbon (C) by combining it with water. There was no reaction between the carbon and water. The stud

svp [43]

I disagree. Carbon is not a group 18 element. This is incorrect because elements closer to the top of the group are less reactive than those at the bottom of the group. Group 18 elements are noble gases and carbon, a group 14 element, is a non metal.

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3 years ago

If our eyes could see a slightly wider region of the electromagnetic spectrum, we would see a fifth line in the Balmer series em

erica [24]

Answer: Wavelength associated with the fifth line is 397 nm

Explanation:

$E=\frac{hc}{\lambda}$

$\lambda$ = Wavelength of radiation

E= energy

For fifth line in the H atom spectrum in the balmer series will be from n= 2 to n=7.

Using Rydberg's Equation:

$\frac{1}{\lambda}=R_H\left(\frac{1}{n_i^2}-\frac{1}{n_f^2} \right )\times Z^2$

Where,

$\lambda$ = Wavelength of radiation

$R_H$ = Rydberg's Constant = $10973731.6m^{-1}$

$n_f$ = Higher energy level = 7

$n_i$ = Lower energy level = 2 (Balmer series)

Putting the values, in above equation, we get

$\frac{1}{\lambda}=10973731.6\times \left(\frac{1}{2^2}-\frac{1}{7^2} \right )\times 1^2$

$\frac{1}{\lambda}=2.52\times 10^{6}m$

$\lambda}=3.97\times 10^{-7}m=397 nm$ $1nm=10^{-9}m$

Thus wavelength λ associated with the fifth line is 397 nm

7 0

4 years ago

Compare photons of gamma and radio radiation. which has: the longer wavelength? the greater frequency? the greater energy?

Nataly [62]

<span>Gamma radiation has a shorter wavelength, a higher frequency and higher energy than radio radiation. Wavelength is inverse to frequency and energy (i.e. higher wavelength means lower frequency and lower energy, and vice versa).</span>

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4 years ago

Which chemical equation is balanced? Question 4 options: CH4 + O2 → H2O + CO2 CH4 + O2 → 2H2O + CO2 6CH4 + O2 → 2H2O + 2CO2 CH4

Alexxx [7]

Answer:

CH4 + 2O2 → CO2 + 2H2O

Explanation: Hope this helps you.

6 0

3 years ago

Read 2 more answers