A piece of a metal alloy with a mass of 125 g was placed into a graduated cylind

Question

A piece of a metal alloy with a mass of 125 g was placed into a graduated cylinder that contained 25.0 mL of water, raising the water level to 52.5mL. What is the density of the metal 0.154 g/cm^3 0.592 g/cm^3 2.68 g/cm^3 4.55 g/cm^3 7.25 g/cm^3 An atom of the isotope 137^Ba consists of how many protons (p), neutrons (n), and electrons (e)? 56 p, 137 n, 56 e 56p, 81 n, 56 e 137 p, 81 n, 56 e 56 p, 56 n, 56 e 81 p, 56 n, 81 e Complete the following chart, in order from left to right Isotope Mass Number 40 Protons 19 Neutrons Electrons 19 40^Zr, 21 19^K, 40^21K, 19^40K, 21 38^Sr, 19 An aluminum ion, Br^-, has: 17 protons and 17 electrons 27 protons and 24 electrons 35 protons and 35 electrons 34 protons and 24 electrons 35 protons and 36 electrons An oxide ion, Ca^2+, has: 8 protons and 10 electrons 18 protons and 18 electrons 19 protons and 19 electrons 20 protons and 18 electrons 20 protons and 20 electrons Which list shows the correct order for the chloride ion, chlorate ion, and ion, in that order? CIO_3^-, and CIO_4^-, and Cl^- CIO_4^-, CIO_3^-, and Cl^- Cl^-, CIO_4^-, and CIO_3^- Cl^-, CIO_3^-, and CIO_4^- CIO_3^-, CIO_4^-, and Cl^-

Explanation / Answer

(5) Volume of the metal = volume of water raised = 52.5 - 25.0 = 27.5 mL = 27.5 mL x 1 cm3/mL

Density , d = mass / volume

= 125 g / 27.5 cm3

= 4.55 g/cm3

Option (D) was correct

(6) Number of protons = Number of electrons = atomic number of Ba = 56

Number of neutrons = mass number - atomic number = 137 -56 = 81

Option (B) is correct

(7) Number of neutrons = mass number - atomic number = 40-19 = 21

So isotope is 40K

Option (D) was correct

(8) Atomic number of Br = number of protons = 35 protons

Number of electrons = atomic number - chanrge = 35 - (-1) = 36

Option (E) was correct

(9) Atomic number of Ca = number of protons = 20 protons

Number of electrons = atomic number - chanrge = 20 - (+2) = 18

Option (D) was correct

(10) Option (D) was correct

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