Which statement describes the charging method shown? A. The spheres are charged through friction.

B. The spheres develop the same charge.

C. Electrons move from the roo to Sphere A.

D. Electrons move from Sphere A to Sphere B.

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

Imagine if during the cathode ray experiment, the size of the particles of the ray was the same as the size of the atom forming the cathode. which other model or scientific observation would have also been supported? 1. this would support dalton's postulates that proposed the atoms are indivisible because no small particles are involved. 2. this would support bohr's prediction about electrons moving in orbits having specific energy. 3. this would support bohr's prediction about electrons being randomly scattered around the nucleus in the atom. 4. this would support dalton's postulates that proposed that atoms combine in fixed whole number ratios to form compounds.

Calculate the ph of a .10m nh4cl solution. the kb value for nh3 is 1.8×10^-5