Right Side Header: Copy down DATE: 8/24 or

Right Side Header: Copy down DATE: 8/24 or

Right Side Header: Copy down DATE: 8/24 or 8/25 I will be able to summarize Daltons 5 Postulates I will be able to round numbers to a specified digit You need 1 piece of lined paper

Roots of Atomic Theory Democritus 1st proposed idea matter was no infinitely divisible Matter made of particles called atomos

Atoms cannot be created, destroyed, or further divided Different atoms have different sizes and shapes Aristotle Empty space cannot exist Matter is made of earth, fire, and water Alchemy medieval forerunner of chemistry

based on the supposed transformation of matter It was concerned particularly with attempts to convert base metals into gold or to find a universal elixir Can we convert one metal into another metal? Write the question and write you answer and explanation.

Share with your face partner. Lets see if we can! Atomic Theory Postulates It took 2,000 years to disprove Aristotles idea of nature. Postulate- a thing suggested or assumed as true, existent, or fact as a basis for reasoning, discussion, or belief

Left Side: What have you learned about alchemy? There are 5 postulates about the atom- write 5 things you know to be true about atoms in your group Daltons Postulates FOLDABLE With the paper horizontal, fold two flaps of equal size

inward Vertically fold paper into thirds. Open back up. Cut along the horizontal folds on the FRONT FLAPS ONLY John Dalton Sept 6th 1766 July 27th 1844 First job age 10

Became a teacher at 12 Proficient in Latin by 14 Meteorology, Color Blindness, & Hiking Atomic Theory from studying gasses in 1803 All matter consists of a large number of tiny particles

Matter Anything that has mass and takes up space Atom smallest particle of an element that retains the properties of the element Atoms of an element are unique,

indestructible, and indivisible Element- pure substance that cannot be broken down into simpler substances Each element has its own characteristics Atoms cannot destroyed or divided Smallest unit of matter

Atoms of a given element are identical in size, mass, and chemical properties Mass measure that reflects the amount of matter Chemical property ability or inability of a substance to combine with or change into one or

more new substances Chemical rxn involve separating, combining, or rearranging of atoms Atoms are neither created, destroyed, divided into parts, or converted into atoms of another element Chemical reaction (rxn) Process by which the atoms of one or more substances are rearranged to form different substances

Indicated by change in temperature, color, odor, and physical state Different atoms combine in wholenumber ratios to form compounds and molecules Molecules two or more nonmetal atoms covalently bond to become more stable

Compounds Chemical combination of two or more different elements ROUNDING NUMBERS! How to Round Numbers keep

Example: Decide which is the last digit to keep. Draw your line. Round 74.0 to 2 digits. Rounding Down: leave it the same if the next digit is less than <5 5 74.0 Answer: 74 (74 gets "rounded down") How to Round Numbers keep

Example: Decide which is the last digit to keep. Draw your line. Round 86.65 to 3 digits. Rounding up: increase it by 1 if the next digit is 5 or more 86.65

>5 Answer: 86.7 (The number gets "rounded up") Example 1 Round the atomic mass of carbon to 3 digits.

Example 2 Part a) Round the atomic mass of yttrium to 3 digits. Part b) Now, round the same starting number to 4 digits.

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