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
masya89 [10]
3 years ago
7

If a substance cannot be seperated physically or chemically, it is ?

Chemistry
1 answer:
Dmitrij [34]3 years ago
4 0

Then it is a pure substance, or an element.

You might be interested in
If after heating the reaction between magnesium and hydrochloric acid, the mass of the magnesium chloride and beaker is measured
Allushta [10]

Since the beaker was heated we can asume that only magnesium cloride is left in the beaker, therfore the difference between the beaker with magnesium chloride and the empty beaker give the mass of magnisium chloride:

\text{mass MgCl}_2=massbeakerwithMgCl_2-mass\text{ emprty beaker =37.83 g - 33.95g = 3.8}8g

7 0
1 year ago
Two tectonic plates under water move apart, and magma fills the space between them. This is an example of
Mama L [17]
Seafloor spreading is the answer to your question.
4 0
3 years ago
Read 2 more answers
A mixture of H2 and water vapor is present in a closed vessel at 20. 00°C. The total pressure of the system is 755. 0 mmHg. The
MAVERICK [17]

The partial stress of H2 is 737.47 mmHg Let's observe the Ideal Gas Law to find out the whole mols.

We count on that the closed vessel has 1L of volume

  • P.V=n.R.T
  • We must convert mmHg to atm. 760 mmHg.
  • 1 atm
  • 755 mmHg (755/760) = 0.993 atm
  • 0.993 m.1L=n.0.082 L.atm/mol.K .
  • 293 K(0.993 atm 1.1L)/(0.082mol.K /L.atm).
  • 293K = n
  • 0.0413mols = n

These are the whole moles. Now we are able to know the moles of water vapor, to discover the molar fraction of it.

  1. P.V=n.R.T
  2. 760 mmHg. 1 atm
  3. 17.5 mmHg (17.5 mmHg / 760 mmHg)=0.0230 atm
  4. 0.0230 m.1L=n.0.082 L.atm/mol.K.293 K(0.0230atm.1L)/(0.082mol.K/L.atm .293K)=n 9.58 × 10 ^ 4 mols = n.
  5. Molar fraction = mols )f gas/general mols.
  6. Molar fraction water vapor =9.58×10^ -four mols / 0.0413 mols
  7. Sum of molar fraction =1
  8. 1 - 9.58 × 10 ^ 4 × mols / 0.0413 ×mols = molar fraction H2
  9. 0.9767 = molar fraction H2
  10. H2 pressure / Total pressure =molar fraction H2
  11. H2 pressure / 55mmHg = =0.9767 0.9767 = h2 pressure =755 mmHg.
  12. 737,47 mmHg.
<h3>What is a mole fraction?</h3>

Mole fraction is a unit of concentration, described to be identical to the variety of moles of an issue divided through the whole variety of moles of a solution. Because it's miles a ratio, mole fraction is a unitless expression.

Thus it is clear that the partial pressure of H2 is 737,47 mmHg.

To learn  more about partial pressure refer to the link :

brainly.com/question/19813237

<h3 />

5 0
3 years ago
10. Chromium (III) oxide reacts with carbon dioxide to form..
Jobisdone [24]

Answer: chromium(III)

Explanation:

5 0
3 years ago
Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide. NH4I (s) ⇌ NH3 (g) + HI (g) At 400 ºC, Kp = 0.215. Calcul
ollegr [7]

<u>Answer:</u> The partial pressure of ammonia is 0.464 atm

<u>Explanation:</u>

For the given chemical equation:

                  NH_4I(s)\rightleftharpoons NH_3(g)+HI(g)

Initial:               1

At eqllm:        1-x                 x         x

The expression for K_p for the following equation is:

K_p=p_{NH_3}\times p_{HI}

The partial pressures of solids and liquids are taken as 1 in the equilibrium expression.

We are given:

K_p=0.215

Putting values in above equation, we get:

0.215=x\times x\\\\x=0.464atm

Hence, the partial pressure of ammonia is 0.464 atm

5 0
3 years ago
Other questions:
  • Cu(NO3)2 + Zn (s) → Cu (s) + Zn(NO3)2 is an example of which type of reaction?
    5·1 answer
  • I NEED HELP PLEASE ANSWER
    9·1 answer
  • Write the type of reaction for: Ca(OH)2 + Al2(SO4)3 \rightarrow CaSO4 + Al(OH)3
    7·1 answer
  • How many amino acids are considered scientist to be “essential
    11·1 answer
  • Name one reason life was impossible on early earth
    10·2 answers
  • When 0.422g of phosphorus is burned, 0.967g of a white oxide is obtained.
    15·2 answers
  • Asolution has a pH of 8. Which best describes the solution?
    5·2 answers
  • Reactants which do not continue to completion are called reactants
    13·1 answer
  • The unit of measure for potential and kinetic energy is the
    10·2 answers
  • Help me please im stuck!​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!