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.
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
Performing well in subjects with practical papers requires a combination of preparation, organization, and effective test-taking strategies. Here are some tips to help you excel in such subjects:Remember that practice,
The General Certificate of Secondary Education (GCSE) and the International General Certificate of Secondary Education (IGCSE) are two widely recognized qualifications for students aged 14 to 16. Both curricula cover
Metal extraction is the process of obtaining metals from their ores. Ores are naturally occurring materials from which minerals, often metals, can be extracted. Metal extraction typically involves several steps,
An acid is a substance that forms hydrogen ions H+ when dissolved in water, and A base is a substance that forms hydroxide ions OH- when dissolved in water.
1.What is the definition of an acid according to the Arrhenius theory? a) A substance that donates protons (H⁺ ions) in aqueous solution b) A substance that accepts protons (H⁺
A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs.
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
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
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
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?
To enhance student performance in practical exams, educators should ensure clear communication, provide hands-on practice, create interactive learning environments, give timely feedback, and encourage collaboration, self-assessment, and time management.
In the Periodic Table, how does the metallic character of the elements vary from left to right across a period? A It decreases. B It increases. C It increases then
Find questions related to air and water chemistry in the slides contained in this post.
1 (a) Complete the following equations.(b) An element Y has three naturally occurring isotopes with isotopic masses and relativeabundances as shown below:Calculate the average atomic mass of Y.2. Complete the
1. (a) Using an example in each case, define the following terms.(i) Hygroscopic substance (ii) Deliquescent substances(iii) Efflorescent substances(iv) Hydrated compound(v) Anhydrous substance2. (a) Magnesium ribborn was burnt in air until
The enthalpy of a chemical reaction, often denoted as ΔH (delta H), is a measure of the heat energy absorbed or released during a chemical reaction at constant pressure. Enthalpy
In chemistry, a transition metal (or transition element) is a chemical element in the d-block of the periodic table (groups 3 to 12), though the elements of group 12 (and