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3. Grade 9: Science in English > Unit B Matter and Chemical Change: Section 4.0 > Flashcards

Unit B Matter and Chemical Change: Section 4.0 Flashcards

1
Q

When does a chemical reaction take place?

A

When two or more substance combine to form a new substance

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2
Q

What are the materials at the start of a reaction called?

A

Reactants

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3
Q

What are the new materials called?

A

Products

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4
Q

In a chemical word equation what do plus signs do?

A

Separate the reactants from each other and the products from each other

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5
Q

What does an arrow in a word equation do?

A

Separate the reactants and the products

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6
Q

What is evidence of a chemical change?

A

Change in Color
Change in odour
Formation of solid or gas
Release of absorption or heat

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7
Q

What is an endothermic reaction?

A

A chemical reaction that absorbs heat energy

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8
Q

What does an endothermic reaction feel like?

A

Cold to the touch

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9
Q

What does an exothermic reaction?

A

A chemical reaction that releases heat energy

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10
Q

What does an exothermic reaction feel like?

A

Warm to the touch

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11
Q

What is combustion?

A

A chemical reaction that occurs when oxygen reacts with a substance and gives off energy

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12
Q

What is corrosion?

A

The slow chemical change that occurs when oxygen in the air reacts with metal

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13
Q

What is Cellular Respiration?

A

A chemical reaction that takes place in the cells in your body. Food reacts with oxygen to produce, energy, water, and carbon dioxide

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14
Q

What is the law of conservation of mass?

A

That matter is not created or destroyed in a chemical change

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15
Q

What is an open system?

A

A reaction is open to the environment

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16
Q

What is a closed system?

A

No additional matter is allowed to enter or leave

17
Q

What four factor affect the rate of a chemical reaction?

A

The presence of a catalyst
The concentration of reactants
The temperature of the reactants
The surface area of the reactants

18
Q

What are catalysts?

A

Substances that help a reaction proceed faster. They are present with the reaction but are not consumed during the reaction

19
Q

How does the concentration help the rate of a chemical reaction?

A

The greater the concentration of the reactant the faster the reaction

20
Q

How does temperature affect the rate of a chemical reaction?

A

The more heat added to the reactants the faster the reaction. The heat causes the atoms to move faster increasing the chances of their colliding with each other.

21
Q

how does surface area affect the rate of a chemical reaction?

A

The greater surface area means more area is available for reaction

3. Grade 9: Science in English (20 decks)

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