Answer is: 3) H2O and HCl.
Polar molecules are water (H₂O) and hydrochloric acid (HCl).
Nonpolar molecules are carbon(IV) oxide (CO₂) and methane (CH₄).
Carbon(IV) oxide is nonpolar because CO₂ is linear molecule and the oxygen atoms are symmetrical (bond angles 180°).
Water is polar because of the bent shape of the molecule.
Hydrochloric acid has polar covalent chemical bond where hydrogen has oxidation umber +1 and chlorine oxidation number -1.
In molecule of methane (CH₄) all the atoms around the central element (carbon) are equivalent (four hydrogens) and it has a net dipole moment of 0 (vectors of dipole moments cancel each other, dipole moment is zero).
Answer:
a) M HCl = 32.162 mol/L
b) m HCl = 15.873 mol/Kg
Explanation:
- wt% = (mass HCl / mass sln)×100
- δ HCl = mass HCl / Volume sln
- molarity = mol HCl / V sln (L)
- molality = mol HCl / Kg solvent
∴ MW HCl = 36.46 g/mol
assuming mass sln = 1 g
∴ mass sln = 1 g = g solvent + g solute
∴ solute: HCl
⇒ 0.37 = g HCl / g sln
⇒ g HCl = 0.37 g
⇒ g ste = 1 - 0.37 = 0.63 g
⇒ Kg ste = (0.63 g)×(Kg/1000 g) = 6.3 E-4 Kg
⇒ mol HCl = (0.37 g HCl)×(mol/36.46 g HCl) = 0.010 mol HCl
∴ V sln = (0.37 g)/(1.19 g/mL) = 0.3109 mL
⇒ V sln = (0.31 mL)×( L/1000 mL) = 3.109 E-4 L
a) molarity (M):
⇒ M HCl = 0.010 mol HCl / 3.109 E-4 L
⇒ M HCl = 32.162 mol/L
b) molality (m):
⇒ m HCl = ( 0.010 mol HCl) / (6.3 E-4 Kg)
⇒ m HCl = 15.873 mol/Kg
It has the shape of the container, so yes
<u>Answer:</u> The half life of the given radioactive isotope is 43.86 minutes
<u>Explanation:</u>
Rate law expression for first order kinetics is given by the equation:
![k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}](https://tex.z-dn.net/?f=k%3D%5Cfrac%7B2.303%7D%7Bt%7D%5Clog%5Cfrac%7B%5BA_o%5D%7D%7B%5BA%5D%7D)
where,
k = rate constant = ?
t = time taken for decay process = 233 minutes
![[A_o]](https://tex.z-dn.net/?f=%5BA_o%5D)
= initial amount of the reactant = 0.500 M
[A] = amount left after decay process = 0.0125 M
Putting values in above equation, we get:
The equation used to calculate half life for first order kinetics:
where,
= half-life of the reaction = ?
k = rate constant = 
Putting values in above equation, we get:
Hence, the half life of the given radioactive isotope is 43.86 minutes
Answer:
Remove your shirt and any other clothing that were in contact with the chemical
Explanation:
A hazardous chemical has the capacity to cause damage to the body when it comes in contact with the skin. Many hazardous chemicals are capable of being absorbed into the body via the skin.
Once your lab coat is already doused with the chemical and it has started soaking into you clothing, you must remove your lab coat, shirt and all clothing that were in contact with the hazardous chemical as a safety measure to avoid absorption of the chemical into the body via the skin. Some of these chemicals also cause damages directly to the skin and this must be avoided.
