Alkali vs Halogens

What is a common characteristic of reactions involving Group 1 and Group 7 elements?

• They do not involve electron transfer.

• They primarily result in the formation of covalent bonds.

• They involve the loss or gain of electrons.

• They only occur under extreme temperatures.

Which test is used to identify the presence of hydrogen gas?

• Precipitation test

• Flame test

• Lit splint, "pop" test

• Litmus test

What demonstrates the relative reactivities of chlorine, bromine, and iodine?

• Their ability to form ionic compounds

• Displacement reactions

• Combustion reactions

• Synthesis reactions

Which of the following is not a property or use of chlorine?

• Used in water purification

• Used as a bleaching agent

• Enhances the flavor of food

• Used in the production of pesticides

What is the result of a reaction between sodium (a Group 1 element) and chlorine (a Group 7 element)?

• Formation of a metallic alloy

• Formation of a salt

• Release of a noble gas

• Production of a metal oxide

What is the outcome when a glowing splint is introduced to oxygen gas?

• It extinguishes immediately

• It produces a "pop" sound

• It glows more brightly / relights

• It changes color

How can you demonstrate the reactivity series among halogens using displacement reactions?

• By observing changes in pH

• By testing solubility in water

• By mixing halogens with metals

• By reacting halogens with halide salts of each other

What happens when potassium (a Group 1 element) reacts with water?

• It forms a hydroxide (alkaline) solution and hydrogen gas is released.

• It produces a precipitate.

• It increases the solution's pH without gas release.

• It has no reaction with water.

Which test would confirm the presence of carbon dioxide gas?

• Blue litmus paper turns red.

• Lime water turns milky.

• Flame test produces a green color.

• Bubbling in hydrogen peroxide.

What is the result of a reaction between lithium (a Group 1 element) and oxygen?

• Formation of a salt.

• Release of hydrogen gas.

• Production of a metal oxide.

• No reaction occurs.