CCC Post Test Review

Patterns: Repeating Events, Relationships between variables

EXAMPLE: ​

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1. ​What is the pattern or trend shown in the table above? *As the temperature increases, the density decreases.

2. ​What might be the density at 80 degrees Celsius? *0.953 (less than that at 60 degrees)

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Patterns

​CAUSE: Why something happens/ What makes something happen

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EFFECT: ​What is the outcome or the result

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EXAMPLE:

​Your (alarm did not go off this morning), so (you were late to school.)

Cause: ​alarm did not go off this

morning

Effect: ​you were late to school

​"Scale and proportion are both design elements that have to do with size. Scale is the size of one object in relation to the other objects in a design or artwork. Proportion refers to the size of the parts of an object in relationship to other parts of the same object."

https://kidcourses.com/principles-design-scale-proportion/​

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EXAMPLE 1:​

1. Using your own knowledge and the picture on the previous slide, put the following ojects in order from smallest to largest: Heart/Organ, Atom, Cell, ​Insect, DNA, Person.

   *Atom, DNA, Cell, Insect, Heart/Organ​, Person

​Scale, Proportion and Quantity

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​EXAMPLE 2: Quantity/Counting Atoms

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1. In the example to the left, how many atoms of Calcium are there?​ *Calcium (Ca) has no subscript, so there is one atom present. The coefficient is 3 and 3 x 1 is 3, so there are 3 atoms of Calcium.

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2. How many atoms of Chlorine (Cl) are there?​ *2 x 3 = 6, so there are 6 atoms of Chlorine.

Matter cannot be created or destroyed it can only chnage forms.

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This is why we: balance equations.​

Law of Conservation of Matter​

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​In the equation to the left, methane gas (CH₄) is combining with Chlorine (Cl₂) gas to make Carbon Tetrachloride (CCl₄) and Hydrochloric Acid (HCl). According to the law of conservation of matter the carbon in the Carbon Tetrachloride would have come from where? *The methane gas (CH₄) on the reactant side.

​EXAMPLE: In chemistry, the periodic table is an important organizational structure for elements. You can use it to understand atomic structure, how elements react, which elements are most reactive, etc.

​1. Which group to the left is the most reactive in the periodic table: A, B, C or D?

*A​

2. Which group to the left is the least reactive in the periodic table: A, B, C or D?

*D​

​Why is group 1 the most reactive and group 18 the least reactive?

​Systems are constantly in flux or changing.

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One example of how things change in a system is how the motion of molecules is affected by temperature.​ (A physical change)

​1. In which state of matter are molecules further apart and move the fastest?

* Gas​

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2. In which state of matter are molecules more compact and move the slowest?​

​ *Solid

​1. What happens to the motion of molecules as temperature is increased?

*As the temperature increases, the motion of the molecules increases.​ The molecules themselves stay the same, only their motion is affected.