Chemistry Exam Review Flashcards

A set of flashcards to review key chemistry concepts and questions for an upcoming exam.

What is the formula of magnesium oxide?

MgO

What state symbol represents the physical state of hydrogen chloride at room temperature?

g

Which gas is a compound among the gases listed?

Carbon monoxide

Which gas is necessary for rusting to occur?

Oxygen

Which gas bleaches moist litmus paper?

Chlorine

What is the boiling point of oxygen?

-183 °C

What observation indicates that magnesium is more reactive than zinc when reacting with HCl?

Many bubbles produced quickly.

What are the products formed when magnesium reacts with dilute hydrochloric acid?

Magnesium chloride and hydrogen.

What is the meaning of isotopes?

Atoms of the same element with different numbers of neutrons.

Which element in Group 7 is the most reactive?

Fluorine.

What property of aluminium makes it suitable for making drink cans?

Lightweight and unreactive due to oxide layer.

What type of reaction occurs when magnesium burns in oxygen?

An oxidation reaction.

Describe what a catalyst does to the rate of a reaction.

It speeds up the reaction by lowering the activation energy.

What happens to the boiling point of hydrogen when it is in H2 state?

It remains low because of weak intermolecular forces.

What are the state symbols for sodium oxide and water in their reaction?

(s) for Na2O and (l) for H2O.

What is the chemical equation for the decomposition of hydrogen peroxide?

2H₂O₂ → 2H₂O + O₂

How to test if a gas is oxygen?

Use a glowing splint; it will relight in oxygen.

Define an exothermic reaction.

A reaction that releases energy, usually in the form of heat.

What color does universal indicator turn when mixed with sodium hydroxide?

Purple.

What is the maximum mass of ammonium nitrate that can be produced from 34 kg of ammonia?

160,000 g.

Describe the process to prepare copper sulfate from copper oxide.

React copper oxide with sulfuric acid, filter excess oxide, evaporate to crystallize.