Question

use the data table below to answer question 9.

1. which atom has a net positive charge?

(a) atom w
(b) atom x
(c) atom y
(d) atom z

1. based on the statements below, how are atoms a and b related?

atom a has 9 protons, 10 neutrons, and 9 electrons
atom b has 9 protons, 9 neutrons, and 9 electrons
(a) a and b are isotopes of the same element.
(b) a is an ion and b is a neutral atom.
(c) a and b are different elements.
(d) a is neon and b is fluorine.

1. a solution of silver nitrate reacts with a solution of potassium chloride producing a solid, white precipitate at the bottom of the test tube according to the reaction below.

agno₃(aq) + kcl(aq) → agcl(s) + kno₃(aq)
does the combination of these solutions result in a chemical or physical change?
(a) physical change - the end result can be physically separated and each substance has distinct properties
(b) physical change - there is no change in identity from the beginning substances, atoms are only rearranged
(c) chemical change - new substances are created with unique properties and identities
(d) chemical change - the products are different phases than the reactants

Explanation:

Step1: Calculate the charge for each atom

The charge of an atom is calculated as \(Charge = Number\ of\ Protons - Number\ of\ Electrons\)
For Atom \(W\): \(Charge = 3 - 3=0\)
For Atom \(X\): \(Charge = 53 - 54=- 1\)
For Atom \(Y\): \(Charge = 55 - 54 = + 1\)
For Atom \(Z\): \(Charge = 1 - 1=0\)

Answer:

C. Atom Y