1. Which of the following isn't electrically neutral? A. Neutron
B. Atom C. Molecule
D. Proton
2. Which of the following element has no neutron partied particle?
A. Hydrogen B. Helium
C. Lithium
D. Sodium
3. Which one of the following is the heaviest sub-atomic particle?
A. Electron B. Helium
C Proton
D. Ion
4. The nucleus of an atom is positively charged due to
A. electrons b. neutrons C. proton D. Ion
5. The atomic nucleus consists of
and
particles
A. electron and proton
C. proton and electron
B. neutron and electron D. Proton and neutron
6. The first Greek philosopher who proposed the concept of an atom was
A. Dalton
C. Robert Boyle
B. Aristotle
D. Democritus

Nconcentration refers to the molar concentration of an ion in solution. it may be identical to, or greater or less than, the molar concentration of the compound containing the ion that was used to make the solution. for soluble salts, the molarity of a particular ion is equal to the molarity of that compound times the subscript for that ion. for example, 1 m of alcl3 is 1 m in al3+ and 3 m in cl−. 1 m of (nh4)2so4 is 2 m in nh4+ and 1 m in so42−. part a what is the concentration of k+ in 0.15 m of k2s? view available hint(s) nothing m m part b if cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? view available hint(s) if is dissolved in water, what can be said about the concentration of the ion? it has the same concentration as the cl− ion. its concentration is half that of the cl− ion. its concentration is twice that of the cl− ion. its concentration is one-third that of the cl− ion. part c a scientist wants to make a solution of tribasic sodium phosphate, na3po4, for a laboratory experiment. how many grams of na3po4 will be needed to produce 550 ml of a solution that has a concentration of na+ ions of 0.700 m ? express your answer numerically in grams. view available hint(s) mass of na3po4 n a 3 p o 4 = nothing g provide feedback

Sugar is dissolved in water. which is the solute? sugar neither both water

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?