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4 years ago

What is the melting point of water?

Chemistry

1 answer:

o-na [289]4 years ago

6 0

the melting point of water is 32 degrees Fahrenheit , 0 degrees Celsius.

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The successive ionization energies for a given element are listed. How many valence electrons does it have?

damaskus [11]

Answer:

3 valence electrons

Explanation:

Let us first find the amount increased for everything.

From 1st to 2nd, 1048 - 620 = 428

428 increased from 1st to 2nd.

From 2nd to 3d, 2144 - 1048 = 1096

1096 increased from 2nd to 3rd.

From 3rd to 4th, 8724 - 2144 = 6580

6580 increased from 3rd to 4th.

From 4th to 5th, 10141 - 8724 = 1417

From 3rd to 4th, it increased the most. Therefore, we assume that those are the beginning core electrons and not valence electrons. Also, starting from 3rd, they are all core electrons.

For the 1st and 2nd, we can assume they are valence electrons because the kJ/mol didn't increase that much.

Since the core electrons started from the 3rd, we most likely have 3 valence electrons.

So the final answer is 3.

Hope it helped!

5 0

3 years ago

H2 burning in O2 to form H2O (l) is an example of a system where the entropy of the universe decreases.

leva [86]

Answer:

B. False

Explanation:

the reaction is

H₂0 + O₂ = H₂O

as addition of oxygen means burning in the system which means heating or energy is necessary for the reactants. SO the reaction is spontaneous and exothermic .

As according to second law of thermodynamics

the change in enthalpy is greater than or equal to zero when the reaction is spontaneous, so enthalpy will increase in the above reaction.

H2 burning in O2 to form H2O (l) is an example of a system where the entropy of the universe increases.

6 0

3 years ago

Question 4 (1 point) If you have exactly one million atoms how many moles do you have?

rjkz [21]

Answer:

1.66 × 10⁻¹⁸ Moles

Explanation:

As we know one mole of any substance contains 6.022 × 10²³ particles (atoms, ions, molecules or formula units). This number is also called as Avogadro's Number.

The relation between Moles, Number of Atoms and Avogadro's Number is given as,

Number of Moles = Number of Atoms ÷ 6.022 × 10²³ Atoms/mol

Putting values,

Number of Moles = 1.0 × 10⁶ Atoms ÷ 6.022 × 10²³ Atoms/mol

Number of Moles = 1.66 × 10⁻¹⁸ Moles

7 0

4 years ago

If 125mL of a 0.15M NaOH solution is diluted to 150mL, what will the new molarity of the solution be?

stiks02 [169]

Answer:

C NaOHsln = 0.125 M

Explanation:

Molarity (M) [=] mol/L

∴ moles NaOH = (0.125 L)(0.15 mol/L) = 0.01875 mol

∴ Vsln = 150 mL = 0.150 L

New Molarity:

⇒ C NaOH = 0.01875 mol/0.150 L

⇒ C NaOH = 0.125 M

6 0

3 years ago

The products obtained from hydroboration-oxidation of cis-2-butene are identical to the products obtained from hydroboration-oxi

Rudik [331]

Answer:

a) Attached below

b) The presence of racemic mixture found as product in both cases shows that products are identical ( i.e. they have same configuration

Explanation:

Diagrams of the products obtained from hydroboration-oxidation of cis-2-butene , hydroboration-oxidation of trans-2-butene.

attached below

The presence of racemic mixture found as product in both cases shows that products are identical ( i.e. they have same configuration )

7 0

3 years ago