Question

1. hakim, lisa, and oscar all play instruments. hakim plays the same instrument as oscar. lisa plays the violin. which of the following must be true? i. hakim and lisa play the same instrument. ii. oscar plays the violin. iii. hakim and oscar play the flute. a) i only b) ii only c) i and iii only d) none of the above must be true. 83. the charge of an atom can be found by comparing the number of protons with the number of electrons in that atom. each proton has a value of positive 1; each electron has a value of negative 1. what is the charge of a barium atom with 56 protons and 54 electrons? a) +2 b) +1 c) 0 d) -2

Explanation:

82.

We only know Hakim and Oscar play the same instrument and Lisa plays the violin. There's no information indicating what instrument Hakim and Oscar play. So, we can't say Hakim and Lisa play the same instrument, or Oscar plays the violin, or Hakim and Oscar play the flute.

Step1: Calculate the total value of protons

The value of each proton is + 1 and there are 56 protons. So the total value of protons is $56\times(+1)=56$.

Step2: Calculate the total value of electrons

The value of each electron is - 1 and there are 54 electrons. So the total value of electrons is $54\times(-1)= - 54$.

Step3: Calculate the charge of the atom

The charge of the atom is the sum of the value of protons and electrons, $56+( - 54)=2$.

Answer:

D. None of the above must be true

83.