An echocardiogram (echo=sound + card=heart + gram=drawing) is an ultrasound test that can evaluate the structures of the heart, as well as the direction of blood flow within it. Technicians specially trained in echocardiography produce the images and videos, often using a special probe or transducer that is placed in various places on the chest wall, to view the heart from different directions.
Cement powder is usually mixed with sand and aggregate (gravel, granite) and when needed, they are mixed with water to form concrete. Figures 4 and 5 Builders and masons, prior to the use of modern cement, used a mixture of lime (calcium hydroxide), sand and water, known as lime mortar or simply mortar.
Making calcium hydroxide. Calcium oxide reacts with water to form calcium hydroxide, which is an alkali. Here are the equations for this reaction: calcium oxide + water â calcium hydroxide. CaO + H 2 O â Ca(OH) 2. A lot of heat is produced in the reaction, which may even cause the water to boil.Page: 1  1. 2  2. 3  3.4  4.ere are the equations for this reaction: calcium oxide + water â calcium hydroxide. CaO + H 2 O â Ca(OH) 2. A lot of heat is produced in the reaction, which may even cause the water to boil. Page: 1  1. 2  2.