Anupriya has observed many examples of forces acting around her. She has listed the examples into three groups based on which kind of force acting: Group 1 : A car screeching to a halt, a matchstick lighting up when struck.
Group 2: A woman skiing down a mountain slope, the rise of ocean tides.
Group 3: A ship floating in the ocean, a parachute slowing the fall of a sky diver.

In which group Anupriya should put falling of a tree.
Group 1

Group 2

Group 3

None of the above

Classify this reaction: 2al+n2-> aln.

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution. calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?