A theory should be able to explain the relevant data and lead to correct predictions.

The main cause of the increase in the amount of CO2 in Earth's atmosphere over the past 150 years is Question 50 options: a. inc

Bogdan [553]

Answer:

d.

Explanation:

In the past 150 years, the human population had increased, and the use of fossil fuels (coal and petroleum) increased too, especially to attend the human necessity of energy. When the wood and fossil fuels are burned, the principal reaction products are CO₂ and water.

When the CO₂ achieves the atmosphere, it impedes the Sun rays that come to Earth's surface to return to space, which is called the greenhouse effect. Wich large amounts of these and other gases, more radiation stays on Earth, and warmer it becomes.

So, analyzing the statements:

a. The primary production is the production made by the plants, which uses CO₂ and the Sunlight to produce their food, so it doesn't increase the CO₂ concentration. FALSE

b. The standing crop is the number of plants in determined space, so, an increase of it would increase the consumption of CO₂ to primary production. FALSE

c. The increase of the radiation absorbed by the atmosphere is an effect of the increase of the concentration of CO₂, and not what causes it. FALSE

d. Is the correct answer, as explained above.

e. The respiration of the human population produces CO₂ as a product, but it's much smaller than the one produced by the burning of fossil fuels. FALSE

4 0

3 years ago

The true absorbance for a 1.0 x 10 −5 M solution is 0.7526. If the percentage stray light for a spectrophotometer is 0.56%, calc

Korvikt [17]

Answer:

The percentage deviation is $\Delta M = 1.87$ %

Explanation:

From the question we are told that

The concentration is of the solution is $C = 1.0*10^{-5} M$

The true absorbance A = 0.7526

The percentage of transmittance due to stray light $z = 0.56$ % $=\frac{0.56}{100} = 0.0056$

Generally Absorbance is mathematically represented as

$A = -log T$

Where T is the percentage of true transmittance

Substituting value

$0.7526 = - log T$

$T = 10^{-0.7526}$

$= 0.177$

$= 17.7$ %

The Apparent absorbance is mathematically represented

$A_p = -log (T +z)$

Substituting values

$A_p = -log(0.177 + 0.0056)$

$= -log(0.1826)$

= 0.7385

The percentage by which apparent absorbance deviates from known absorbance is mathematically evaluated as

$\Delta A = \frac{A -A_p}{A} * \frac{100}{1}$

$= \frac{0.7526 - 0.7385}{0.7526} * \frac{100}{1}$

$\Delta A = 1.87$ %

Since Absorbance varies directly with concentration the percentage deviation of the apparent concentration from know concentration is

$\Delta M = 1.87$ %

6 0

4 years ago

When a soda can is dropped, it should not be immediately opened. Why?

umka2103 [35]

When soda companies add carbon dioxide gas to a soda mixture, the water is very cold so it can hold a lot of gas. They also use pressure to put more gas in the water than it could normally hold at that temperature. But when a soda can warms up a bit or when the can is shaken, that extra gas is really ready to come out. So when you open up the can and release the pressure, splooosh!

6 0

4 years ago

Read 2 more answers

2Mg+O2-2Mgo

ololo11 [35]

The first one I think

8 0

3 years ago

How many moles of gas would occupy a 25.0 liter when the temp is 22.0 degrees celsius and the pressure is 646 torr

Luda [366]

Answer:

0.877 mol

Step-by-step explanation:

We can use the Ideal Gas Law to solve this problem.

pV = nRT Divide both sides by RT

n = (pV)/(RT)

Data:

p = 646 torr

V = 25.0 L

R = 0.082 06 L·atm·K⁻¹mol⁻¹

T = 22.0 °C

Calculations:

(a) Convert the pressure to atmospheres

p = 646 torr × (1 atm/760 torr) = 0.8500 atm

(b) Convert the temperature to kelvins

T = (22.0 + 273.15) K = 295.15 K

(c) Calculate the number of moles

n = (0.8500 × 25.0)/(0.082 06 × 295.15)

= 0.877 mol

3 0

3 years ago