Water is a compound because it A. cannot be broken down into simpler substances. B. always has two hydrogen atoms for each oxyge
2 answers:
Answer: Option (B) is the correct answer.
Explanation:
A compound is defined as a substance in which two or more different elements in a fixed ratio by mass combine chemically with each other.
For example, chemical formula of water is and it is a compound because here two atoms of hydrogen chemically combine with one atom of oxygen.
And, the ratio of these atoms is 2 : 1. A compound can be broken down into simpler substance by chemical means only.
Whereas an element is a substance that contains only same type of atoms that cannot be broken down into simpler substances.
Thus, we can conclude that water is a compound because it always has two hydrogen atoms for each oxygen atom.
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The glassware with the highest degree of accuracy is 250 mL beaker.
<h3>What is accuracy?</h3>When in an experiment, a value is measured 5 times, then if the values measured are same for most of the time or like three times out of five, it said to be accurate. The phenomenon is accuracy.
Accuracy compares the experimental value to the theoretical value.
Accepted density of water = 0.99 g/mL
1. 10 mL cylinder
Mass of water = 6.76 g
Volume of water = 6.8 mL
Density = mass /Volume
density = 6.76/6.8 = 0.99412 g/mL
Percentage error = [Observed value - Accepted value/ Accepted value ] x 100
% error = [0.99412 - 0.99 / 0.99 ] x 100
% error = 0.416 %
2. 50 mL cylinder
Mass of water = 24 g
Volume of water = 24.2 mL
density = 24/24.2 = 0.9917 g/mL
Percentage error = [Observed value - Accepted value/ Accepted value ] x 100
% error = [0.9917 - 0.99 / 0.99 ] x 100
% error = 0.172 %
3. 25 mL cylinder
Mass of water = 17 g
Volume of water = 17.1 mL
density = 17/17.1 = 0.99415 g/mL
Percentage error = [Observed value - Accepted value/ Accepted value ] x 100
% error = [0.99415 - 0.99 / 0.99 ] x 100
% error = 0.419 %
4. 250 mL beaker
Mass of water = 35 g
Volume of water = 35.3 mL
density = 35/35.3 = 0.9915 g/mL
Percentage error = [Observed value - Accepted value/ Accepted value ] x 100
% error = [0.9915 - 0.99 / 0.99 ] x 100
% error = 0.152 %
Lesser the percentage error, higher is the accuracy.
Thus, 250 mL beaker has the highest degree of accuracy.
Learn more about accuracy.
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