Test 1. Identify the following questions.
1. Basic unit of an element is called?
2. It is a process in which a liquid becomes solid.
3. It is a change from solid to liquid
4: The conversion of a gas to a liquid.
5. Group of atoms that are chemically combined are called?
1. Basic unit of an element is called?
2. It is a process in which a liquid becomes solid.
3. It is a change from solid to liquid
4: The conversion of a gas to a liquid.
5. Group of atoms that are chemically combined are called?
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Answer:
1.An atom is the basic unit of a chemical element. Atoms are made out of three main parts: protons, neutrons and electrons. Protons and neutrons are contained inside the very center of the atom, which is called the nucleus.
2.Freezing, or solidification, is a phase transition in which a liquid turns into a solid when its temperature is lowered to or below its freezing point.
3.For example, a solid may become a liquid. This phase change is called melting. When a solid changes into a gas, it is called sublimation. When a gas changes into a liquid, it is called condensation.
4.The process of a liquid becoming a gas is called boiling (or vapourization), while the process of a gas becoming a liquid is called condensation.
5.A compound is a distinct group of atoms held together by chemical bonds.