It involves experimentation and observation of the pencil dropping from different heights
Explanation:
Students are being asked to drop the pencil from different heights and to measure the time it takes for a pencil to fall from different heights and then calculate the speed corresponding to each height and measured time. In this scenario the students are doing science as they carrying out experiments and making observations to find a unknown which is the speed of the pencil falling from different heights.
The tea was no longer hot or (brewed) so the 5th didn’t dissolve like the others because the tea was hot or warm enough anymore it cooled down. So the sugar won’t dissolve no more.
Molarity is defined as the number of moles of solute in 1 L of solution the mass of Ca(NO₃)₂ present - 8.50 g therefore number of moles of Ca(NO₃)₂ - 8.50 g / 164 g/mol = 0.0518 mol the volume of solution prepared is 755 mL therefore if there are 0.0518 mol in 755 mL then in 1000 mL the number of moles - 0.0518 mol / 0.755 L molarity is therefore - 0.0686 M
<span>The answer is A because an elements only consists of one type of atom. Example. the element H (hydrogen) only contains 1 hydrogen atom. I hope this helps!! </span>
