Indicate whether each of the following substances would be more soluble in H2O or C6H14:(a) KI
(b) C8H18
(c) grease
(d) CH3(CH2)12OH
(e) NaC2H3O2
Answers
Answer:
H2O-a,e, C6H14 - b,c,d
Explanation:
H2O - (a) KI, e(NaC2H3O2) because they are ionic compounds
C6H14 -(b) C8H18, (c) grease, (d) CH3(CH2)12OH because they are mostly un-polar.
Final answer:
KI and NaC2H3O2 are ionic and therefore more soluble in polar solvents like H2O, while C8H18, grease, and CH3(CH2)12OH are nonpolar and more soluble in nonpolar solvents like C6H14.
Explanation:
The solubility of a substance generally follows the principle of 'like dissolves like'. That means polar substances are more soluble in polar solvents (like H2O) and nonpolar substances are more soluble in nonpolar solvents (like C6H14).
- KI is ionic, therefore it is polar and more soluble in H2O.
- C8H18 is nonpolar, hence more soluble in C6H14.
- Grease is nonpolar, so it is more soluble in C6H14.
- CH3(CH2)12OH is nonpolar due to the long hydrocarbon chain, making it more soluble in C6H14, despite the polar OH group at the end.
- NaC2H3O2 is ionic, hence it is polar and more soluble in H2O.
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3. State the law of conservation of matter, and give an example demonstrating its meaning.
4. Electrolysis is used to break liquid water into hydrogen and oxygen gas. If I begin with 10 grams of liquid water, will the total mass of the two gases be greater than, less than, or equal to 10? Why?
5.What kind of observations can indicate a transfer of energy has taken place in a reaction?
Answers
2. O2 is a molecule because a molecule is one or more of the same element atom.
3. The law of conversion is that the mass of the system will stay the same when transfer takes place. Like if you had an equation O+H2—> H2O the mass will remain the same.
4. It will be equal to 10 because of law of conservation of matter.
5. One observation can be that the compound, reaction you’re observing, has change states.
Answers
Answer: The correct answer is polar, tetrahedral and non-polar.
Explanation:
It is given a compound which is silicon tetrahydride having formula
The electronegativities of silicon and hydrogen are 1.9 and 2.1 respectively.
Difference in electronegativity = 2.1 - 1.9 = 0.2
From above, some difference in the electronegativities of the atoms is there. This means that bond polarity of this molecule is polar. If the difference would have been 0, the bond polarity of the molecule is taken as non-polar.
- To determine the molecular shape of the given molecule, we calculate the hybridization of this molecule. The equation used for this is:
where,
V = number of valence electrons present in central atom i.e. Silicon = 4
N = number of monovalent atoms bonded to central atom = 4
C = charge of cation = 0
A = charge of anion = 0
Putting values in above equation, we get:
As, the total number of electron pairs is 4, this means that the hybridization of this molecule will be and the molecular shape will be tetrahedral.
- The net dipole moment of the molecule is 0 because of the symmetry of the molecule. Thus, the molecule is considered as a non-polar molecule.
Hence, the correct answer is polar, tetrahedral and non-polar.
Answers
Answer:
46
Explanation:
Sodium metal has a molar mass of
22.99
Answers
assuming accurately synchronized arrival times of the shock waves.
Hope this helps a bit :)
Answers
When a potassium atom loses an electron, it obtains a positive charge and becomes a potassium ion (K +). It goes as follows: K → K + + e - . Therefore, carries a positive charge.
What is potassium ?
The chemical element with the atomic number 19 and the letter K is potassium. Potassium is a silvery-white metal that may be easily and gently sliced with a knife. Within seconds of exposure, potassium metal quickly combines with air oxygen to produce flaky, white potassium peroxide.
Many significant chemicals are formed by potassium. The most prevalent potassium compound is potassium chloride (KCl). It is used to make other compounds, a salt alternative, and fertilizers.
Vegetables, fruit, potatoes, meat, bread, milk, and nuts all contain potassium. It aids neuronal activities and plays a significant part in the human body's fluid system. 95% of the potassium in the body is found inside cells, where it congregates as the ion K+.
Thus, When a potassium atom loses an electron, it obtains a positive charge and becomes a potassium ion (K +).
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If it loses 1 electron, it will now have 1 more proton than electrons.
Thus, the charge would be 1+
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Answers
and 2yy- for homozygously green
ratio=50:50