Assuming the question is asking for percent composition by mass,
The molar mass of sodium bicarbonate is:
22.990 + 1.008 + 12.011 + 3*15.999 = 84.006 g/mol
The molar mass of 3 oxygen atoms is:
3*15.999 = 47.997 g/mol
The percentage composition by mass is:
47.997/84.006 * 100% = 57.1% (3 s.f.)
The answer is B. Compound. If it was an element, it would just be Ca, or Calcium.
Polar or ionic substances dissociate into ions when dissolved in water.
<h3>What substances dissociate into ions when dissolved in water?</h3>
Ionic substances dissociate into ions when dissolved in water because water is also a polar by nature. We know that like dissolve like so polar substances dissolve in water and dissociate into ions i.e. positive an negative ions.
So we can conclude that polar or ionic substances dissociate into ions when dissolved in water.
Learn more about ions here: brainly.com/question/14511468
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Answer:
Increasing precision with multiple measurements
Explanation:
The more measurements you take (provided there is no problem with the clock!), the better your estimate will be. Taking multiple measurements also allows you to better estimate the uncertainty in your measurements by checking how reproducible the measurements are.
