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### Slide1:

D iscoveries or the history of the atoms and the atomic theory.

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Give the three major temperature scales

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Fahrenheit, Celsius and Kelvin.

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Convert 50 F to C

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Answer: F= 9/5 (C+32) = 9/5 (60) + 32 = 180+32 2.F = 9/5 (C+32) = 9/5 (60) + 32 = 180+32 = 140 F

### Slide7:

Convert 60 C to F

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3.F = 9/5 (C+32) = 9/5 (60) + 32 = 180+32 = 140 F

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Convert 95 C to K

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4.K = C+ 273 K = 95+273 = 368K

Yes ma’am!

### Slide14:

Ma’am! Our topic for today is all about atom.

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Objectives At the end of the lesson, 100% of the lesson shall be able to attain at least 75% level of proficiency to: a. describe the discoveries of the atoms b. enumerate the subatomic structure of an atom

atom

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Ma’am! An atom is the smallest particles of a matter.

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Atoms are from the Greek word “ atomos ” which means indivisible or unable to be divided or separated

Yes ma’am!

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Atoms have three subatomic particles which are very common. What are they?

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Ma’am! Atoms are made up of three subatomic particles which are protons, electrons and neutrons.

### Slide22:

D iscoveries or the history of the atoms and the atomic theory.

Yes ma’am!

### Slide24:

Group 1   This is Democritus' atomic theory states that: 1. All matter consists of invisible particles called atoms. 2. Atoms are indestructible. 3. Atoms are solid but invisible. 4. Atoms are homogenous. 5. Atoms differ in size, shape, mass, position, and arrangement. ->Solids are made of small, pointy atoms. ->Liquids are made of large, round atoms. ->Oils are made of very fine, small atoms that can easily slip past each other.

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Democritus Greek philosopher, co-originated the thought (with his teacher, Leucippus) that all matter is composed of indivisible elements .

Group II

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Dalton's Atomic Theory 1) All matter is made of atoms. Atoms are indivisible and indestructible. 2) All atoms of a given element are identical in mass and properties 3) Compounds are formed by a combination of two or more different kinds of atoms. 4) A chemical reaction is a rearrangement of atoms.

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John Dalton British chemist and physicist, developed a theory that matter is simply composed of atoms of different weights and is combined in ratios by weight. atoms are spherical, and are in motion.

Group III

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Group III Law of Conservation of matter (1799) -by Antoine Lavoisier -states that “in chemical reactions matter is neither created nor destroyed”   The number of atoms remains constant throughout the reaction. Since the number of atoms doesn’t change, the mass must remain constants as well.

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So When you build fire during a camping trip, you pile up cut logs and some kindling and set a flame to it. As the fire continues, the logs burn until you are eventually left with a small amount of ash and charred remains .

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Law of Conservation the magnitude of properties within a chemical system, such as mass, energy, or charge, remain unchanged during a chemical reaction. These properties may be exchanged between components of the system; however, the total amount in the system does not increase or decrease .

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Wood is made of mainly carbon, hydrogen, and oxygen . When you burn wood, the heat from the fire breaks down the bonds between the elements. Hydrogen and oxygen are released into the air, while the carbon is left behind . Char, the black material left behind after wood is burnt, is mostly made of carbon.

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The mass of the end products appears smaller. But if we were able to measure the mass of the released carbon and oxygen plus the mass of the remaining char, we would find that the mass of all of these end products would be the same as our original wood. The form of the matter may be different, having transformed from solid wood to volatile gases and char, but the total mass of the end products are the same as what we started with.

Yes ma’am!

Group IV

### Slide38:

Group IV Law of Constant Composition - by Joseph Proust -states that “each pure chemical compound always has the same percentage composition of each element by mass.” A certain chemical compound always contains the same elements chemically combined in the same proportions by mass.

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Joseph Proust states that “if a compound is broken down into its constituents will always have the same proportions, regardless of the quantity or source of the original substance. For instance

Yes ma’am!

Generalization

Yes ma’am!

### Slide45:

Question: ___________, a Greek philosopher, co-originated the thought (with his teacher, Leucippus) that all matter is composed of indivisible elements.

1. Democritus

### Slide47:

Question What is Law of Conservation of Matter?

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2. States that “In chemical reactions matter is neither created nor destroyed”.

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Question Give the three subatomic particles of an atom.

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3. The three subatomic particles of an atom are the protons, electrons and neutron.

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Question He proposed the Atomic Theory.

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4. John Dalton proposed the Atomic Theory

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IV.Evaluation Answer the following: 1.The Greek word ___ which means indivisible. 2.He proposed the Law of Conservation of matter. 3.List the three (3) subatomic particles of an atom. 4. _______ proposed that these atoms are spherical, and are in motion.   5 . It explains that the number of atoms remains constant throughout the reaction. Since the number of atoms doesn’t change, the mass must remain constants as well.

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V. Assignment Answer the following: What are Elements and Compounds? Differentiate Metals from Non-metals