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Here is a Sample Worksheet for you to Practice. Download this worksheet to see the answers.
A solution has a pH of 3, while another solution has a pH of 5. Compared with the second solution, the hydrogen ion concentration of the first solution is:
2 times greater
2.10 times greater
3.100 times greater
4.1000 times greater
A student adds zinc granules to dilute hydrochloric acid. Which observation and chemical equation are correct?
Brown gas is evolved; Zn + HCl → ZnCl? + H?
2.Colourless gas is evolved; Zn + 2HCl → ZnCl? + H?
3.No gas is evolved; Zn + HCl → ZnCl + H?
4.Green gas is evolved; Zn + 2HCl → ZnCl? + H?
Which statement correctly explains why the left ventricle has a thicker muscular wall than the right ventricle?
It receives oxygenated blood from the lungs
2.It pumps blood to the entire body
3.It pumps blood only to the lungs
4.It prevents mixing of oxygenated and deoxygenated blood
During vigorous exercise, muscle cells may produce lactic acid because:
Oxygen supply becomes insufficient for complete oxidation of glucose
2.Glucose cannot enter muscle cells
3.Carbon dioxide is not produced
4.Mitochondria stop functioning permanently
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