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givi [52]
3 years ago
7

He best ultraviolet observations are made with space telescopes because A. the Sun blocks most ultraviolet light from distant st

ars. B. the Earth's gravity reflects most ultraviolet light from distant stars. C. the Earth's atmosphere absorbs most ultraviolet light. D. space telescopes are closer to distant galaxies.
Chemistry
1 answer:
ankoles [38]3 years ago
7 0

Answer:

C.  The earth's atmosphere absorbs most UV light.

Explanation:

You might be interested in
What other green plant which make they own food
kobusy [5.1K]

Answer and

Explanation:

Chlorophyll gives plants their green color because it does not absorb the green wavelengths of white light. That particular light wavelength is reflected from the plant, so it appears green. Plants that use photosynthesis to make their own food are called autotrophs

3 0
2 years ago
What is the theoretical yield of this test reaction? Record answer to the nearest whole number.
NNADVOKAT [17]

Answer : The theoretical yield of water in this reaction is 360 g.

Solution : Given,

Mass of

Mass of

Mass of

Molar mass of  = 44 g/mole

Molar mass of  = 24 g/mole

Molar mass of  = 18 g/mole

First we have to calculate the moles of  and .

Moles of  =

Moles of  =

The given balanced chemical reaction is,

From the given reaction, we conclude that

1 mole of  react with 2 mole of

20 moles of  requires  of

But the actual moles of  = 42 moles

Excess moles of  = 42 - 40 = 2 moles

So,  is the limiting reagent.

Now we have to calculate the mass of .

From the reaction, we conclude that

1 mole of  gives 1 mole of

20 moles of  gives 20 moles of

Mass of  = Moles of  × Molar mass of  

Mass of  = 20 moles × 18 g/mole = 360 g

The experimental yield of  = 325 g

Therefore, the theoretical yield of  = 360 g

Read more on Brainly.com - brainly.com/question/2525928#readmore

7 0
3 years ago
Read 2 more answers
Assuming the metals lose all their valence electrons, and the nonmetals gain electrons to complete the s-p subshells, which list
enot [183]
The building of all the profiles is correct; The total number of electrons is correct, as well as the filling of the shells to their entirety. However, some charge calculations are off. First, we see that sodium loses an electron in its structure. Hence, it acquires a charge of +1, not -1. Also, Fluorine gains 2 electrons in its 2p subshell. Thus, its charge is -2, not -1 and this is wrong too. The only correct answer is C; aluminum lose 3 electrons from its p-shell and hence it has a charge of +3.
4 0
3 years ago
A quantity of CO gas occupies a volume of 0.64 L at 0.90 atm and 307 K . The pressure of the gas is lowered and its temperature
levacccp [35]

This is an incomplete question, here is a complete question.

A quantity of CO gas occupies a volume of 0.48 L at 1.6 atm and 282 K. The pressure of the gas is lowered and its temperature is raised until its volume is 2.1 L. Find the density of the CO under the new conditions?

Answer : The density of the CO under the new conditions is, 0.213 g/L

Explanation :

First we have to determine the moles of CO gas by using ideal gas equation.

PV=nRT

where,

P = pressure of gas = 0.90 atm

V = volume of gas = 0.64 L

T = temperature of gas = 3 07 K

R = gas constant = 0.0821 L.atm/mol.K

n = number of moles of gas = ?

Now put all the given values in the above formula, we get:

(0.90atm)\times (0.64L)=n\times (0.0821L.atm/mol.K)\times (307K)

n=0.0228mol

Now we have to calculate the mass of CO gas.

\text{ Mass of }CO=\text{ Moles of }CO\times \text{ Molar mass of }CO

Molar mass of CO = 28g/mole

\text{ Mass of }CO=(0.0228moles)\times (28g/mole)=0.638g

Now we have to calculate the density of CO gas.

\text{Density of CO gas}=\frac{\text{Mass of CO gas}}{\text{Volume of CO gas}}

\text{Density of CO gas}=\frac{0.638g}{3.0L}=0.213g/L

Therefore, the density of the CO under the new conditions is, 0.213 g/L

4 0
3 years ago
2 CO(g) + O2(g) + 2 CO2(g)<br> What type of reaction is shown above?
sergij07 [2.7K]

Answer:

I'm pretty sure its a combination reaction!!

Explanation:

they generally form between metals and non metals like that^

7 0
3 years ago
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