Consider the two facts below: Fact 1: Dissolved oxygen is one of the most important nutrients needed by fish in the aquatic envi
2 answers:
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Answer:
Whether barium chloride solution was pure
Explanation:
We may answer whether barium chloride was pure. The sequence of this experiment might be depicted by the following balanced chemical equations:
Having a total sample of 10.0 grams, we would firstly find the mass percentage of barium in barium chloride:
This means in 10.0 g, we have a total of:
of barium cations.
The precipitate is then formed and we measure its mass. Having its mass determined, we'll firstly find the percentage of barium in barium sulfate using the same approach:
Multiplying the mass we obtained by the fraction of barium will yield mass of barium in barium sulfate. Then:
- if this number is equal to 6.595 g, we have a pure sample of barium chloride;
- if this number is lower than 6.595 g, this means we have an impure sample of barium chloride, as we were only able to precipitate a fraction of 6.595 g.
Answer: 1. The coefficient is 1.12
2. The exponent is 4
3. There are 3 significant digits
4. The rightmost significant figure is 2.
Explanation:
Scientific notation is defined as the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.
For example : 5000 is written as
According to avogadro's law, 1 mole of every gas contains avogadro's number of particles and occupy 22.4 L at STP.
molecules of
occupy = 22.4 L at STP.
Thus molecules of
occupy =
at STP.
Scientific notation =
The coefficient is 1.12
The exponent is 4
There are 3 significant digits
The rightmost significant figure is 2.