CHEMISTRY MIDDLE SCHOOL

Which best defines partial pressure in a mixture of gases? pressure that is exerted by all the gases of a mixture on the container
pressure that is exerted by one gas as if it occupied a container by itself
half of the pressure that is exerted by the gases of a mixture on the container
sum of the individual pressures that are everted by two or more gases

Answers

Answer 1
Answer:

Answer:

Pressure that is exerted by one gas as if it occupied a container by itself.

Answer 2
Answer:

Answer:

Pressure that is exerted by one gas as if it get occupied a container by itself

Explanation:


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HIGH SCHOOL

Which group of molecules have c h and o in the ratio of 1 2 1?

Answers

Monosaccharide is the group of molecules that have c h and  int the ratio 1 2 1
HIGH SCHOOL

Read the given equation. Na2O2 + CO2 → Na2CO3 + O2 What volume of O2 gas is produced from 2.80 liters of CO2 at STP?

Answers

Answer:

1.40 L  

Step-by-step explanation:

We can use Gay-Lussac's Law of Combining Volumes to solve this problem.

Gases at the same temperature and pressure react in simple whole-number ratios.


1. Write the balanced chemical equation.

Ratio:                   2 L                          1 L

         2Na₂O₂ + 2CO₂ → 2Na₂CO₃ + O₂

V/L:                    2.80


2. Calculate the volume of O₂.

According to Gay-Lussac, 1 L of O₂ forms from 2 L of CO₂.

Thus, the conversion factor is (1 L O₂/2 L CO₂).

Volume of CO₂ = 2.80 L CO₂ × (1 L O₂/1 L CO₂)

                         = 1.40 L O₂

Answer:

1.40 L.

Explanation:

  • It is a stichiometric problem.
  • Firstly, we should wright the reaction as a balanced equation:

Na₂O₂ + CO₂ → Na₂CO₃ + 1/2 O₂

  • It is clear that 1.0 mole of Na₂O₂ reacts with 1.0 mole of CO₂ to produce 1.0 mole of Na₂CO₃ and 0.5 mole of O₂.
  • Then we should convert the volume of CO₂ (2.80 L) to moles via using the gas law of ideal gas: PV = nRT, n = PV / RT,

Where, P is the pressure of the gas in atm (P at STP = 1.0 atm).

V is the volume of the gas in L (V = 2.80 L).

R is the general gas constant (R = 0.082 L.atm/mol.K).

T is the temperature in K (T at STP = 0.0 °C + 273 = 273 K).

∴ n of CO₂ = PV / RT = (1.0 atm) (2.80 L) / (0.082 L.atm/mol.K) (273 K) = 2.80 / 22.386 = 0.125 mole.

From the stichiometry:

1.0 mole of CO₂ will produce → 0.50 mole of O₂

0.125 mole of CO₂ will produce → ??? mole of O₂

  • The number of moles of O₂ produced = (0.125 mole of CO₂) (0.50 mole of O₂) / (1.0 mole of CO₂ ) = 0.06254 mole.
  • Finally, we can convert the number of moles of O₂ produced to volume using the mentioned gas law of ideal gas: V = nRT/P.
  • V of O₂ produced = nRT / P = (0.06254 mole) (0.082 L.atm/mol.K) (273.0 K) / (1.0 atm) = 1.40 L.

HIGH SCHOOL

what volume of concentrated hydrochloric acid (12.0 M HCl) is required to make 2.0 liters of a 3.0 M HCl solution?

Answers

2.0 L(3.0mol/1 L)=6 mol HCl
0.5L 12.0M HCl is needed to make 2.0 L of 3.0M HCl
MIDDLE SCHOOL

An atom has an electron configuration of 1s², 2s², 2p⁶, 3s², 3p3
how many valence electrons does the atom have?

Answers

Answer:

5

Explanation:

The full electronic configuration of the element is

1s²2s²2p63s²3p³

The total number of electrons = addition of the index

That is number of electrons = 2+2+6+2+3 = 15

Therefore the atomic number of the element is 15.

Name of element with atomic number 15 is Phosphorus with symbol P

Number of electrons in the atom of the element is 15.

Using KLMN configuration = 2:8:5

Therefore number of valence electrons is 5

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COLLEGE

What is responsible for the formation of a solution?

Answers

An aqueous solution is produced when a solute dissolves in water. The biggest responsible is the water that is the solvent of substances in smaller proportion as some ions of K +, Na +, Cl -, forming true solutions. Occurs when a solute dissolves in the water solvent, the separation between the substances is atomic, molecular or ionic, depending on the solution.
MIDDLE SCHOOL

How does Earth's orbit around the Sun cause our seasons to change?

Answers

The Earth is tilted, so it will be lit by different parts of the Sun as it orbits.
MIDDLE SCHOOL

Which properties doom metalloids share with metals

Answers

Metalloids are all solid at room temperature. Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semiconductors. Silicon, for example, appears lustrous but is not malleable or ductile (it is brittle - a characteristic of some nonmetals).

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HIGH SCHOOL

 A good hypothesis must be which of the following? testable  
falsifiable
correct 
not based on previous research

Answers

I believe a good hypothesis must be testable, as suggesting an idea must be accompanied by scientific procedures and ways to figure out if the hypothesis holds true or not.
Goood hypotheisis always need to be tested
COLLEGE

A molecule of a certain compound contains two nitrogen atoms and four oxygen atoms what is the molecular formula for this compound

Answers

The molecular formula would be N2O4.
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