1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
stellarik [79]
1 year ago
12

Please help me need ASAP number 9 and 11 please

Chemistry
1 answer:
sasho [114]1 year ago
5 0

Answer:

Explanation:  9.  The sample has molecules larger than those of the liquid that did not pass through the filter paper.   Ions combined forming the precipitate, which is what the powder residue is.   In the liquid solution you had + aqueous ions and -aqueous ions.  Depending on the charges of those ions they combined in equal numbers.  For instance Na+1  would combine with Cl -1 and form salt.  Now the solution could have had more quantity of one ion than the other so some remained aqueous and went through the filter paper, and the rest combined with the limited reactant.  Not all combined at the time they were poured thorugh the filter paper and that's why a precipitate was found after the rest of the liquid of the solution evaporated.  Sometimes for atoms to combine a certain amount of energy must be placed in the system to get more of them to combine.  

11.  You can draw a container of gas that has H+ molecules floating and O2 molecules floating.  Under some type of pressure these can combine with two of the H+ atoms connnected to the diatomic oxygen molecule (which is O2 because there are two of them together in the gas form).  There must be energy added to the system this is in for the O2 to break apart to combine with two of the H+ gas to form H2O which is water.   But without that added energy it's just a container with the H+ dispersed among the O2 molecules.  I cannot draw on my program, sorry.  But just draw a box and have several of each mixed up in the box, but not attached to each other since it's not showing any energy put into the system.  

You might be interested in
Please let me know if this is correct?
siniylev [52]

Answer: Yes! you're all good. Alkali metals in group 1 are the most metallic :)

6 0
3 years ago
The decomposition of dinitrogen pentaoxide has an activation energy of 102 kj/mol and \delta ? h°rxn = + 55 kj/mol. what is the
posledela
A positive cahnge of enthalpy, ΔH rxn = + 55 kJ/mol, for the forward reaction means that the reaction is endothermic, i.e. the reactants absorb energy and the products are higher in energy.

Activation energy is the difference in the energy level of the reactants and the peak in the potential energy diagram (the energy of the transition state).

For an endothermic reaction, the products will be closer in energy to the transition state than what the reactans will be; so, the activation energy of the reversed reaction is lower than the activation energy of the forward reaction.

Activation energy of reverse and forward reactions is related by:

Activation energy of reverse rxn = Activation energy of forward rxn - ΔH rxn

=> Activiation energy of reverse rxn = 102 kJ/mol - 55 kJ/mol = 47 kJ/mol

Answer: 47 kJ/mol
8 0
3 years ago
If 0.55 g of a gas dissolved in 1.0 l of water at 20.0 kpa of pressure, how much will dissolve at 110.0 kPa of pressure?
GaryK [48]

Answer:sup

Explanation:

4 0
3 years ago
Help with chemistry please<br><br>Which chemical reaction involves the most oxygen atoms?
Ratling [72]
H2O is A chemical reaction of the most oxygen atoms
3 0
3 years ago
According to observations, the overall chemical composition of our solar system and other similar star systems is approximately
jonny [76]

Answer:A

Explanation:

The solar system consist of the sun, the planets, stars and other objects. The chemical composition of the Sun consist mainly of Hydrogen and helium.

The sun is the largest object in the Solar system, it comprises nearly all the matter in the Solar System, Also the largest planet after the Sun are Jupiter and Saturn are giant planets forming almost the remaining matter of the solar system.

Like the Sun, the mass of Jupiter and Saturn are composed of roughly 98% hydrogen and helium with 2% of all the other elements combined.

3 0
3 years ago
Other questions:
  • How to write a balanced chemical equation from empirical formula?
    5·1 answer
  • Write the equilibrium constant expression, Kc, for the following reaction: Please enter the compounds in the order given in the
    10·1 answer
  • What does frequency describe? A.distance from crest to crest or from trough to trough on a wave B.Number of waves that pass a gi
    7·1 answer
  • Imagine dissolving a spoonful of sugar in a glass of water. Is the sugar-water combination classified as a compound or a mixture
    14·2 answers
  • A sample of grape juice has a hydroxide ion concentration of 1.4 × 10-10 M
    15·2 answers
  • “Representative elements”? Which groups of the periodic table contain the “representative elements”?
    13·1 answer
  • Drag each tile to the correct box.
    15·2 answers
  • Hello can you please help me to solve above questions. .​
    13·1 answer
  • how much heat energy is needed to raise the temperature of 78.4g of aluminum from 19.4 degrees c to 98.6 degrees c.
    13·1 answer
  • 2055 Q. No. 10^-2
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!