Q.I Fill in the blanks:
1) All matter is made up of very tiny particles called
2) The moon completes one revolution around the earth in
days.
3) A uniform mixture of a solute and solvent is called a
4) The
of the earth on its axis causes day and night.
5) The soil deposited by the rivers is called
6) The wearing out and carrying away of the topsoil by natural forces is called
7) The earth spins like a top from
to
8) Among the three layers of soil, the
is best for plants
9) Burning of wood is a
change.
10) The
is the star nearest to the earth.
Answers
Answer:
substance is a sample of matter whose physical and chemical properties are the same throughout the sample because the matter has a constant composition. It is common to see substances changing from one state of matter to another. To differentiate the states of matter at least at a particle level, we look at the behavior of the particles within the substance. When substances change state, it is because the spacing between the particles of the substances is changing due to a gain or loss of energy. For example, we all have probably observed that water can exist in three forms with different characteristic ways of behaving: the solid state (ice), liquid state (water), and gaseous state (water vapor and steam). Due to water's prevalence, we use it to exemplify and describe the three different states of matter. As ice is heated and the particles of matter that make up water gain energy, eventually the ice melts in to water that eventually boils and turns into steam.
Before we examine the states of matter, we will consider some ways samples of matter have been classified by those who have studied how matter behaves.
Classifying Matter
Evidence suggests that substances are made up of smaller particles that are ordinarily moving around. Some of those particles of matter can be split into smaller units using fairly strong heat or electricity into smaller rather uniform bits of matter called atoms. Atoms are the building blocks of elements. Elements are all those substances that have not ever been decomposed or separated into any other substances through chemical reactions, by the application of heat, or by attempting to force an direct electric current thr