Explanation: Chemicals in the original manufacturer’s container that have been recently purchased from a supplier will most likely contain hazard information in the form of warnings and pictograms. Older manufacturer’s chemical containers may have alternative labeling schemes that provide essentially the same information as the new labels.
<span>Na + Cl = NaCl
answer : </span><span>synthesis reaction .
hope this helps!
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Answer :
The parent and daughter concentrations (in percentages) is, 60 % and 40 % respectively.
The age of rock is
Explanation :
First we have to calculate the parent and daughter concentrations (in percentages).
and,
As we know that, the half-life of uranium-238 = years
Now we have to calculate the rate constant, we use the formula :
Now we have to calculate the time passed.
Expression for rate law for first order kinetics is given by:
where,
k = rate constant =
t = time passed by the sample = ?
a = initial amount of the reactant = 3 g
a - x = amount left after decay process = 1.8 g
Now put all the given values in above equation, we get
Therefore, the age of rock is