A homogeneous mixture is a mixture <span>which has uniform composition and properties throughout - it is identical in its every part. So, having this in mind, the correct answer is C. tap water - </span><span>even though it may have different levels of dissolved minerals and gases.</span>
Answer:
The lake went from a liquid to a solid
Explanation:
Since it was so cold overnight, the temperature of the lake increased to the fact that it turned hard enough to skate on. or The temperature outside was so cold it froze the lake solid
Answer:
17202.6 years
Explanation:
Activity of the living sample (Ao) = 160 counts per minute
Activity of the wood sample (A) = 20 counts per minute
Half life of carbon-14 = 5730 years
t= age of the artifact
From;
0.693/t1/2= 2.303/t log Ao/A
Then;
0.693/ 5730= 2.303/t log Ao/A
Substituting values;
0.693/5730= 2.303/t log (160/20)
Then we obtain;
1.209×10^-4 = 2.0798/t
t= 2.0798/1.209×10^-4
Thus;
t= 17202.6 years
Therefore the artifact is 17202.6 years old.
Dispersion forces only for (A): True
Boiling point (C) > Boiling point (A): True, stronger intermolecular forces
(B) exhibits hydrogen bonding: False, no Hydrogen bonded to electronegative atom
Boiling point (C) < Boiling point (A): False, stronger intermolecular forces
(A) exhibits hydrogen bonding: False, no Hydrogen bonded to electronegative atom
Boiling point (A) < Boiling point (B): True, stronger dispersion forces
Boiling point (B) < Boiling point (C): True, stronger intermolecular forces
Dispersion forces only for (C): False, also H-bonding
Boiling point (B) > Boiling point (C): False
Dispersion forces only for (B): True
(C) exhibits hydrogen bonding: True
Boiling point (A) > Boiling point (B): False
Answer: The heat energy produced is 53831.25KJ
Explanation:
METHANE is the main component of natural gas. It can undergo combustion reaction in air with a bright blue flame to produce carbondioxide and water. The heat of reaction (enthalpy) is negative because heat is absorbed during the chemical reaction. To calculate the heat energy produced by the combustion of one kilogram (1 kg) of methane the following steps are taken:
Molecular mass of methane =16 gm/mol.
So moles of 1 kg methane =
Given mass of methane ÷ molecular weight of methane
But the given mass = 1kg = 1000g
Therefore,
moles of 1000g methane = 1000÷16
= 62.5 moles
Hence, energy evolved = (moles of methane) × (heat of combustion)
Therefore,
heat energy produced= 62.5 × (-861.3kj)
= -53831.25kj