high school physical science

The rhythmic contractions and relaxation of the heart create high pressures required to keep the blood vessels from collapsing and also to ensure that all parts of the body get the supply of blood that is so vital to their survival and functioning. The pressure created during the ventric..

An electrolyte is a compound (salt, acid or base), which in solution or in a molten state conducts an electric current and is simultaneously decomposed by it Electrolytes are ionised into electrically charged ions, which carry the current Charged ions move towards the oppositely charged ele..

Summary Matter is anything that occupies space and has mass Element is a pure substance, which can neither be decomposed nor built from simpler substances by any physical or chemical means. It contains only one kind of atom. Broadly speaking, elements can be divided into metals..

Summary - Some high fat foods such as potato chips are packaged in materials that protect them from light and oxygen and the containers are flooded with nitrogen to further exclude oxygen At times, to avoid the presence of oxygen altogether, vacuum packaging is used in some processed food..

. For instance, hydrogen is combustible and oxygen is a supporter of combustion. But their product, water, neither burns, nor helps in burning. It actually extinguishes fire. Another familiar example is that of sodium and chlorine. Sodium is a violently reactive metal while chlorine is a highl..

Summary - The grouping of elements with similar properties together and the separation of elements with dissimilar properties is known as classification of elements. The table, which classifies elements on the basis of their properties, is called the periodic table. The earliest classification was ..

Heredity may be defined as the transmission of characteristics through generations Variation may be defined as differences among individuals of a species Both heredity and variation play important roles in evolution of organisms The study of the mechanism of transmission of characteristi..

Disease Mode of Transmission Symptom Prevention Control Malaria Caused by protozoan plasmodium through the bite of the female anopheles mosquito High fever, rigorous which is repeated on or 4th day Prevent mosquitoes from biting and prevent them from breeding A quinine..

Physical Change - A physical change is one in which the shape, size, appearance or state, of a substance may alter, but its chemical composition remains same. No new substance is formed. It is usually a change, which is reversible. By reversing the process, the original substanc..

Most of the non-metals exist in two of the three states of matter at room temperature: gases (oxygen) and solids (carbon). These have no metallic lustre, and do not reflect ligh..