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What is the estimate of how many nerve cells the human nervous system has?
Q16: Atoms of Ca contain how many protons?<br>A)19<br>B)40<br>C)20<br>D)41
Q31: Bromine in the gaseous state is Br<sub>2</sub>
Q36: What is the molecular formula for phenol?<br>A)C<sub>5</sub>H<sub>6</sub>O<br>B)C<sub>6</sub>H<sub>6</sub>O<br>C)C<sub>6</sub>H<sub>5</sub>O<br>D)C<sub>6</sub>H<sub>6</sub>O<sub>2</sub>
Q39: What is the answer, to the correct
Q49: If a student knows the mass of
Q51: Which of the following is not a
Q70: The two compounds SO<sub>2</sub> and SO<sub>3</sub> are
Q102: What can elements form when they react
Q116: What two measurements determine density, and in
Q124: How can mixtures be separated?<br>A)Evaporation<br>B)Filtering<br>C)Both of the