stoichiometry is the relationship between the quantities of reactants and products before, during, and following chemical reactions.
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
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
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
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.
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.
The kinetic theory of gases is a simple, historically significant classical model of the thermodynamic behavior of gases, with which many principal concepts of thermodynamics were established.
Solubility is a measure of the ability of a substance (solute) to dissolve in a given solvent under specific conditions, typically at a certain temperature and pressure. It is expressed
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 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 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
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.
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
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
Acids and bases are two distinct types of chemical substances with contrasting properties. Here are the main differences between acids and bases:
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
noble gas, any of the seven chemical elements that make up Group 8 (VIII) of the periodic table.
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⁺
“We are at a time in history where the smart will maintain a body chemistry that is distinctly different from the masses.” ― Steven Magee
Which metal would be suitable for all of the following uses? • making aircraft bodies • making food containers • making overhead power cables