“A woman or man of value doesn’t love you because of what he or she wants you to be or do for them. He or she loves you because your
Bases can be prepared through various methods depending on the specific base required and the starting materials available. Here are some co...
Which metal would be suitable for all of the following uses? • making aircraft bodies • making food containers • making overhead power cables
A student takes 2 g samples of calcium carbonate and adds them to 20 cm3 samples of dilute hydrochloric acid at different temperatures. She measures how long it takes for
Extraction of metals. Metal ores are naturally occurring rocks that contain metals or metal compounds in sufficient amounts to make it worthwhile extracting them.
In chemistry, an alcohol is a type of organic compound that carries at least one hydroxyl (−OH) functional group bound to a saturated carbon atom.
Hydrogen can be used as a fuel. Which properties of hydrogen would be advantages and which would be disadvantages? 1 2 3 Hydrogen is expensive to produce. Hydrogen reacts exothermically
Rock salt is a mixture of sand and sodium chloride.Sodium chloride is soluble in water but not in hexane.Sand is insoluble in both water and hexane.What is required to separate
Laboratory safety is essential when working in a science laboratory to protect yourself and others and to ensure accurate and reliable results. Here are some general science laboratory rules that
In chemistry and manufacturing, electrolysis is a technique that uses direct electric current (DC) to drive an otherwise non-spontaneous chemical reaction. Electrolysis is commercially important as a stage in the
A reactivity series (or activity series) is an empirical, calculated, and structurally analytical progression of a series of metals, arranged by their "reactivity" from highest to lowest.
A mixture is separated using the apparatus shown. What is the mixture? A aqueous copper chloride and copper B aqueous copper chloride and sodium chloride C ethane and methane D
Synthetic polymerization refers to the process of chemically synthesizing polymers, which are large molecules composed of repeating subunits called monomers.
Two industrial processes that involve heating are • extracting iron from its ore using a blast furnace, • making lime. In which of these processes is calcium carbonate used?
Please note that these questions cover a wide range of topics in O level Chemistry and can be used for practice and review.
Acidity and basicity are fundamental concepts in chemistry that describe the properties of substances and their behavior in aqueous (water-based) solutions. These concepts are often associated with the pH scale,
Find below the main terms used in secondary-level chemistry and their definitions:These are some fundamental terms in secondary-level chemistry, and understanding them is essential for grasping the basics of the
Physical chemistry and organic chemistry are two distinct subfields within the broader discipline of chemistry, and they focus on different aspects of the subject. Here are the key differences between
In organic chemistry, an alkene is a hydrocarbon containing a carbon–carbon double bond. The double bond may be internal or in the terminal position.