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3 years ago

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What is the measurement 111.009 mm rounded off to four significant digits? a. 111 mm b. 111.0 mm c. 111.01 mm d. 110 mm Please s

elect the best answer from the choices provided

1 answer:

faltersainse [42]3 years ago

3 0

Four significant figures would be B. Because 0's before the decimal are not important, but 0's after the decimal are.

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Using microorganisms to break down pollutants into nontoxic organic matter is called? a. bioremediation b. phytoremediation c. b

Brilliant_brown [7]

Answer:

bioremediation

Explanation:

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2 years ago

A 10.4 g sample of CaSO4 is found to contain 3.06 g of Ca and 4.89 g of O. Find the mass of sulfur in a sample of CaSO4 with a m

andrey2020 [161]

The mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.

<h3>How to calculate mass of an element in a compound?</h3>

According to this question, a 10.4 g sample of CaSO4 is found to contain 3.06 g of Ca and 4.89 g of O.

This means that the mass of sulfur in the 10.4g of CaSO4 is 10.4g - (3.06g + 4.89g) = 10.4g - 7.95g = 2.45g

Next, we calculate the percent ratio of each element in the compound; CaSO4.

Ca = 3.06g/10.4g × 100 = 29.42%
S = 2.45g/10.4g × 100 = 23.56%
O = 4.89g/10.4g × 100 = 47.02%

According to this question, a sample of CaSO4 with a mass of 65.8 g is given. The mass of each element in this compound is as follows:

Ca = 29.42/100 × 65.8g = 19.36g
S = 23.56/100 × 65.8g = 15.50g
O = 47.02/100 × 65.8g = 30.94g

Therefore, the mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.

Learn more about mass at: brainly.com/question/13672279

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1 year ago

The Balmer series consists of the spectral lines from hydrogen for an electron making a transition from an excited state to the

MaRussiya [10]

Answer:

Wavelength of the first four spectral line:

$\lambda_1=1216{\AA}$

$\lambda_2=1026{\AA}$

$\lambda_3=972.8{\AA}$

$\lambda_4=950{\AA}$

Explanation:

Lman series when electron from higher shell number and jumps to 1st shell then all the possible lines is called as lyman series.

to calculate wavelength of first four spectral line:

For hydrogen Z=1;

by using rydberg equation

$\frac{1}{\lambda} =RZ^2[\frac{1}{n_1^2} -\frac{1}{n_2^2} ]$

1. n=2 to n=1

$\frac{1}{\lambda} =RZ^2[\frac{1}{n_1^2} -\frac{1}{n_2^2} ]$

$\frac{1}{R} =912{\AA}$ =rydberg constant

$\lambda=\frac{4}{3R}$

$\lambda_1=1216{\AA}$

2. n=3 to n=1

$\lambda=\frac{9}{8R}$

$\lambda_2=1026{\AA}$

3. n=4 to n=1

$\lambda=\frac{16}{15R}$

$\lambda_3=972.8{\AA}$

4. n=5 to n=1

$\lambda=\frac{25}{24R}$

$\lambda_4=950{\AA}$

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3 years ago

What is convection? What happens to heat during it?

Studentka2010 [4]

Answer:

CONVECTION-- Thermal energy is transferred from hot places to cold places by convection. Convection occurs when warmer areas of a liquid or gas rise to cooler areas in the liquid or gas. Cooler liquid or gas then takes the place of the warmer areas which have risen higher.

Explanation:

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2 years ago

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Minchanka [31]

Answer:

C. The third option

Explanation:

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3 years ago