Which elements are highly explosive

Impulse chemistry 4, textbook

We investigate substances 1 The three main forms of chemical substances are elements, compounds and mixtures. An element is a substance that can no longer be broken down into other substances through chemical reactions. There are currently 117 known elements that are arranged in the periodic table of the elements. Elements can be divided into metals and non-metals. Water is a combination of the elements hydrogen and oxygen. Binding forces hold the elements together in a connection. Compounds and elements belong to the group of pure substances. Pure substances cannot be broken down using physical methods. In nature there are almost only mixtures of substances or mixtures of substances. Salt water is a mixture of salt and water. Dough is a mixture of different baking ingredients. In contrast to pure substances, mixtures of substances can be broken down into their components using physical separation processes. If the individual substances are mixed with one another down to the smallest particles in a mixture of substances, one speaks of homogeneous substances (e.g. air or sugar water). Homogeneous mixtures of substances can be divided into alloys (e.g. bronze), solutions (e.g. salt water) and gas mixtures (e.g. air). If the different particles can be distinguished with the naked eye, they are called heterogeneous substances (e.g. granite or milk). Heterogeneous mixtures of substances can be divided into mixtures (eg granite), suspensions (eg Indian ink), emulsions (eg milk), smoke, fog (eg water vapor in air) and foam (eg soap foam). Do different substances have different properties? You can differentiate between different substances on the basis of different properties such as color, smell, taste, hardness, mass, density, solubility, melting and boiling point, but also thermal or electrical conductivity. These material properties can be investigated using physical methods. In this way, a “profile” can be created for every substance. M Water: a chemical compound of the elements hydrogen and oxygen Granite is a heterogeneous mixture. Profile: Gold Color: golden yellow Density: 19.32 g / cm 3 Physical state: solid Melting point: 1,064 ° C Boiling point: 2857 ° C Metals Copper, iron Non-metals Oxygen, chlorine Substances Mixture of substances Granite, salt water Combination of table salt, sugar, heterogeneous granite, milk Element oxygen, copper pure substance oxygen, table salt homogeneous salt water, air 9 film km3e87 For testing purposes only - property of the publisher öbv

Made with FlippingBook

RkJQdWJsaXNoZXIy ODE3MDE =