Q: The fundamental charge of an electron is $$-1.60 \times 10$$^{-19}$$\ \mathrm{C}. If a $$scientist determines the charge to mass ratio of an electron as $$1.76 \times 10^8$\ \mathrm{C/g}$$, what is the total mass of an electron?

$$9.09 \times 10$$^{-28}$$\ \mathrm{g}$$

Question 1

Which subatomic particle is responsible for the chemical identity of an element?

Accepted Answer

Proton

Question 2

A neutral atom of calcium-43 has how many protons, neutrons, and electrons?

Accepted Answer

20 protons, 23 neutrons, 20 electrons

Question 3

Which of the following ions is isoelectronic with Ne?

Accepted Answer

$$\mathrm{Na^+}$$

Question 4

What is the atomic mass of an element with two isotopes: 60% abundance of 10.0 amu and 40% abundance of 12.0 amu?

Accepted Answer

$$10.8\ \mathrm{amu}$$

Question 5

Which element is a representative element in the 3rd Period and Group 1A?

Accepted Answer

$$\mathrm{Na}$$

Question 6

Which of the following is NOT a component of Dalton's Atomic Theory?

Accepted Answer

Atoms can be created or destroyed in chemical reactions.

Question 7

A sample contains 3.0 g of silver and 2.0 g of chlorine. If another sample contains 6.0 g of silver, how many grams of chlorine must it have to obey the Law of Definite Proportions?

Accepted Answer

$$4.0\ \mathrm{g}$$

Question 8

Which element is a metal that is also a chalcogen?

Accepted Answer

$$\mathrm{Te}$$

Question 9

Calculate the molar mass of $$\mathrm{(NH_4$)_2SO_4}.$$

Accepted Answer

$$132.14\ \mathrm{g/mol}$$

Question 10

How many moles of chlorine gas are there in $$8.13 	imes 10$$^{23}$$ molecules?

Accepted Answer

$$1.35\ \mathrm{mol}$$

Question 11

Which of the following elements is a metalloid?

Accepted Answer

$$\mathrm{Si}$$

Question 12

Which element is a representative element that is a homonuclear polyatomic solid at room temperature?

Accepted Answer

$$\mathrm{Sulfur}$$

Question 13

If the density of water is $$1.00\ \mathrm{g/mL} at$$ $$25^\circ\mathrm{C}$$, how many water molecules are found in $$1.50 	imes 10^4$\ \mathrm{\mu L} of $$water?

Accepted Answer

$$5.01 	imes 10$$^{23}$$

Question 14

Which of the following statements is TRUE regarding protons and electrons?

Accepted Answer

Protons and electrons have charges of the same magnitude but opposite signs.

Question 15

Which of the following is a transition metal in the 4th Period with similar chemical properties to copper, Cu?

Accepted Answer

$$\mathrm{Ni}$$

Question 16

Which element is a representative element in the 2nd Period that assumes the shape and volume of its container at room temperature?

Accepted Answer

$$\mathrm{Ne}$$

Question 17

Using the Law of Multiple Proportions, if $$\mathrm{NO}$$ has a mass ratio of N:O as $$14:16$$ and $$\mathrm{NO_2$} as$$ $$14:32$$, what is the ratio of oxygen that combines with a fixed mass of nitrogen?

Accepted Answer

$$1:2$$

Question 18

Which of the following compounds would NOT be associated with the term 'formula unit'?

Accepted Answer

$$\mathrm{CH_3COOH}$$

Question 19

The fundamental charge of an electron is $$-1.60 	imes 10$$^{-19}$$\ \mathrm{C}. If a $$scientist determines the charge to mass ratio of an electron as $$1.76 	imes 10^8$\ \mathrm{C/g}$$, what is the total mass of an electron?

Accepted Answer

$$9.09 	imes 10$$^{-28}$$\ \mathrm{g}$$

Atoms & Elements: Foundations of General Chemistry

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