chemistry

Students should practice, manage time, and organize materials for practical exams, while remaining calm and following instructions. Instructors should offer clear guidance, create a conducive environment, and fairly assess and

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

Chemistry has been termed by the physicist as the messy part of physics, but this is not the reason why the physicists should be allowed to make a mess of

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

Please note that these questions cover a wide range of topics in O level Chemistry and can be used for practice and review.

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 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.

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

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,

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

Which statement is not correct? A-> Petroleum is a mixture of hydrocarbons. B ->The main constituent of natural gas is ethane. C-> The naphtha fraction of petroleum is used for

stoichiometry is the relationship between the quantities of reactants and products before, during, and following chemical reactions.

Inorganic chemistry is a branch of chemistry that focuses on the study of inorganic compounds, which are compounds that do not contain carbon-hydrogen (C-H) bonds. Instead, inorganic chemistry primarily deals

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.

Hardness refers to a material's resistance to indentation, scratching, or abrasion. It is a measure of how easily a material can be scratched or deformed by an external force.

Molding tools are essential in various manufacturing processes, enabling the creation of consistent and precise products. They are used in different types of molding techniques, including injection molding, compression molding,

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.