Answer: A chemical change has occurred.
Explanation: A chemical change is a change which results when there is a change in the chemical composition of the atoms.
Chemical changes are accompanied by:
a) Change in color
b) Absorption or release of heat
c) formation of precipitates
d) production of gas
The white powder is precipitates of lead chloride which do not dissolve.
Answer:
Given molecules are vinegar and triglycerides.
Explanation:
The dipole is a vector quantity and it is heading from less electronegative atom to more electronegative atom in a polar covalent bond.
The structures and the bond dipoles in the given molecules are shown below:
Answer:
650 grams
Explanation:
Given that acetylene gas reacts with oxygen to produce caobon dioxide, water and heat and the unbalnced equation is
Gram-formula mass of g/mol
So, mass of 1 mole of acelylene is 26 grams
Therefore, mass of 25 moles of acelylene=25x26=650 grams
Hence, the mass of 25 moles of acelylene is 650 grams
Answer:
0.010 $.
Explanation:
Hello!
In this case, since 1 troy ounce equals 31.1 grams, we can compute the price of gold per gram first:
Now, we need to compute the grams of copper in 5.17 x10¹⁷ atoms via the Avogadro's number:
Thus, the price is:
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