CHEMISTRY MIDDLE SCHOOL

What are the two important jobs of photosynthesis

Answers

Answer 1
Answer: 1. Photosynthesis is important because oxygen is released as a byproduct. We need that oxygen to survive. 

2. Photosynthesis helps get rid of the carbon dioxide in the air. Carbon dioxide, as you may probably know, is necessary for this process to occur.
Answer 2
Answer:
It converts solar energy into chemical energy that is stored for later use.

Oxygen is created.

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What is the majority of 0.50 g of na dissolved in a 1.5 L solution

Answers

The correct answer is 0.014467 M.  

Molarity is defined as the number of moles present in a liter solution, that is, number of moles / liter solution.  

The molar mass of sodium (Na) is 23.0 g/mol

Thus, 1 mole of Na contains 23.0 g

Now, x moles of Na contains 0.50 g

Moles = 0.50 × 1 / 23.0

Moles = 0.50 / 23.0  

= 0.0217 moles of Na

Molarity = Number of moles / liters of solution

= 0.0217 / 1.5

= 0.014467 M

Why can water dissolve many ionic compounds

Answers

To dissolve an ionic compound, the water molecules must be able to stabilize the ions that result from breaking the ionic bond. Water is a polar molecule. It has a permanent dipole. ... The negative ions have several water molecules around them, all with their H atoms close to the negative ion

Credits
Socratic

3.00 moles of helium gas (He) are in a container with a volume is 2.00 liters and a temperature is at 298 K. What is the approximate pressure in kilopascals?

Answers

Answer:

3718.628 kPa.

Explanation:

  • We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm (P = ??? atm).

V is the volume of the gas in L (V = 2.0 L).

n is the no. of moles of the gas in mol (n = 3.0 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 298.0 K).

∴ P = nRT/V = (3.0 mol)(0.0821 L.atm/mol.K)(298.0 K)/(2.0 L) = 36.7 atm.

  • To convert from atm to kPa:

∵ 1.0 atm = 101.325 kPa.

∴ P = (36.7 atm)(101.325 kPa/1.0 atm) = 3718.628 kPa.

Our solar system consists of the sun, planets, moons, asteroids, rock particles, dust, and gases that orbit the sun. From a scientific perspective, which makes the solar system a system?

Answers

A solar system is made up of objects that interact with one another 
The sun and planets makes our solar system 

Euglena,amoeba, and paramecium are in what kingdom

Answers

Well, it's because they're eukaryotic, single-celled, mobile.

Which sub-layer thins out into space, where there is no air

Answers

Answer:

The exosphere

Explanation:

In Earth atmosphere, the closer to the ground is the troposphere, then the stratosphere, then the mesosphere, in which the highest clouds and radar can reach. Then in the thermosphere, where the auroras and the satellites are form, the air glow starts to disappear until we reach the space in the last layer called exosphere.
The "exosphere" is the most distant and tenuous "layer" of our atmosphere.
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