Question 1

Which law states that the total mass of substances present after a chemical reaction is the same as the mass before the reaction?

Accepted Answer

Law of Conservation of Mass

Question 2

A sample of two compounds, NO and NO$$_2$$, contains 14 g of nitrogen in each. If the mass of oxygen in NO is 16 g, what is the mass of oxygen in NO$$_2$$? What law does this illustrate?

Accepted Answer

32 g; Law of Multiple Proportions

Question 3

Which experiment provided evidence for the existence of the electron as a subatomic particle?

Accepted Answer

Thomson’s cathode ray tube experiment

Question 4

Which of the following statements is NOT a postulate of Dalton’s atomic theory?

Accepted Answer

Atoms are indivisible and cannot be broken down further.

Question 5

A neutral atom of $$^{14}C $$has how many protons, neutrons, and electrons?

Accepted Answer

6 protons, 8 neutrons, 6 electrons

Question 6

Which of the following best describes the difference between an ion and an isotope?

Accepted Answer

Ions have different numbers of electrons; isotopes have different numbers of neutrons.

Question 7

Which element is a metalloid and is found along the staircase line of the periodic table?

Accepted Answer

Silicon (Si)

Question 8

What is the empirical formula for a compound with the molecular formula $$C_6H_{12}O_6$?

Accepted Answer

$$CH_2O$$

Question 9

Which of the following is the correct name for $$FeCl_3$$?

Accepted Answer

Iron(III) chloride

Question 10

A sample of chlorine gas contains 75.77% $$^{35}Cl ($$mass = 34.969 amu) and 24.23% $$^{37}Cl ($$mass = 36.966 amu). What is the atomic weight of chlorine?

Accepted Answer

$$35.45$$ amu

Question 11

Which of the following compounds is an example of a binary molecular compound?

Accepted Answer

CO$$_2$$

Question 12

Which of the following ions is a polyatomic cation?

Accepted Answer

NH$$_4^+$$

Question 13

What is the correct formula for magnesium nitride, formed from Mg$$^{2+}$$ and N$$^{3-}$$ ions?

Accepted Answer

$$Mg_3N_2$$

Question 14

Which acid is formed when HNO$$_2 is $$dissolved in water?

Accepted Answer

Nitrous acid

Question 15

Which of the following is the correct name for the compound $$N_2O_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 16

Which of the following is a property of metals?

Accepted Answer

Shiny luster and good conductor of heat

Question 17

Which group in the periodic table contains the noble gases?

Accepted Answer

Group 8A

Question 18

What is the correct name for the compound $$K_2SO_4$$?

Accepted Answer

Potassium sulfate

Question 19

Which of the following is the correct formula for perchloric acid?

Accepted Answer

HClO$$_4$$

Question 20

Which of the following is an isomer of 1-propanol?

Accepted Answer

2-propanol

Chapter 2

Guida di studio - Domande di pratica

Study guide - Flashcard