![]() It is used in nuclear chemistry and nuclear physics to describe the time required for half of the unstable radioactive atoms in a sample to experience radioactive decay. Half-life - This chemical property is the amount of time it will take for half of the original substance to decay.This equilibrium will last indefinitely unless something happens to change the system. Chemical stability - This chemical property in a given environment, also referred to as thermodynamic stability of a chemical system, refers to the stability that takes place when a chemical system is in its lowest energy state – a state of chemical equilibrium, or balance, with its environment.Some of the most radioactive elements are hydrogen, beryllium, carbon, calcium, cobalt, zinc and iron. On the periodic table of elements, the elements that have no stable isotopes are considered radioactive. Radioactivity - The emission of radiation from an atom with an unstable nucleus, is a chemical property.However, they will rust more quickly if they are combined with pure oxygen.Įxamples of oxidation include the way an apple turns brown after it has been cut, the way a penny turns green, and the way a fender on a car can become rusty. Over time, iron and steel (which is made of iron) will rust. The atoms actually rearrange to form an entirely new substance. Ability to oxidize - This is what takes place by gaining oxygen, losing hydrogen, or losing electrons, and is a chemical property that results in the oxidation number of a substance being changed. A chemical reaction, also called a chemical change, happens when a chemical, or reactant, changes into a new substance, or product.Toxicity is measured by how the lead, chlorine gas, mercury, or other substance affects the organism – basically, by how much damage it does to the organism and how quickly that damage occurs.įor example, lead is a toxic substance that can damage various parts of the human body, including bones, the heart, kidneys, intestines, and the nervous and reproductive systems. Materials with the chemical property of toxicity include lead, chlorine gas, hydrofluoric acid, and mercury. Toxicity - How much a substance can damage an animal, plant, cell, organ, or other organism is its toxicity.Heat of Combustion - This chemical property is the amount of energy that is released as heat when a substance is burned with oxygen.Įxamples of this chemical property is a calorie which converts to energy within the body and the amount of heat generated by the burning of various fuels.Information about flammability is used in building codes, fire codes, insurance requirements, and storing, handling, and transporting highly flammable materials. Fire testing is done to determine how difficult or easy it will be to get a certain material to burn. Flammability - How easily something will burn or ignite, is a chemical property because you can’t tell just by looking at something how easily it will burn. ![]() The internal qualities of a substance must be altered to determine its chemical properties. In other words, when Ammonium nitrate is mixed with water, the reaction between them takes away the heat from the water, making the whole process an endothermic reaction.Chemical properties can only be established by changing a substance’s chemical identity, and are different from physical properties, which can be observed by viewing or touching a sample. When the thin membrane is broken which was separating both the water and Ammonium Nitrate from mixing together, a chemical reaction takes place between them, which in turn makes the water cold as ice, hence helping us to ease our sore back or sprain in an ankle. Now you would be thinking that how an instant cold pack comes under the category of an endothermic reaction. One of them contains water and the other one contains Ammonium nitrate. Have you ever felt a sprain in your neck or shoulder? Or ever had back pain? What you would need to relax instantly from that unbearable pain? Any guess? Well, You need an Instant Cold Pack…!!!Īs the name suggests, an instant cold pack is basically a pack of two pouches separated by a thin membrane which we primarily use to ease the pain that we get from a sore back or sprained ankle.
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