science test reactions Flashcards

1
Q

What is the most important chemical reaction on earth

A

photosynthesis

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2
Q

What are the reactants in photosynthesis

A

water and carbon dioxide

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3
Q

What are the products of photosynthesis

A

glucose and oxygen

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4
Q

Why is photosynthesis so important

A

it produces glucose and makes breathable air for humans

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5
Q

Where does the largest percentage of photosynthesis take place on the earth

A

the ocean

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6
Q

What is the energy source for photosynthesis?

A

light energy from the sun

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7
Q

A reaction that requires energy to take place is called

A

endogenic energy

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8
Q

balanced equation for photosynthesis

A

6CO2 + 6H2O -> C6H12O6 + 6O2

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9
Q

What is the opposite reaction of photosynthesis called

A

cellular respiration

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10
Q

Why do organisms use cellular respiration

A

to generate energy

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11
Q

A reaction that gives off energy is called

A

exergonic reaction

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12
Q

The cell energy product of cellular respiration is called

A

ATP

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13
Q

How is combustion similar to cellular respiration

A

They both release energy and produce carbon dioxide and water

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14
Q

Why is too much combustion a problem on the earth

A

bec it blocks heat coming out of earth

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15
Q

Give 4 alternatives to using combustion as an energy source

A

Solar power, water energy, biofuels, and wind energy

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16
Q

Why is ozone important

A

It absorbs some radiation from the sun which protects the earth’s surface. Protects us from the ultraviolet rays

17
Q

In what layer of the atmosphere is the ozone layer located

A

stratosphere

18
Q

2 reactions that make ozone

A

O2 -> O + O
O + O2 -> O3

19
Q

What is the energy source that makes the first reaction take place

A

ultra violet radiation

20
Q

What type of chemical reaction is the first reaction

A

decomposition

21
Q

What type of chemical reaction is the second reaction

22
Q

determine if something is an element, compound, or mixture

A

Element cannot be broken down, compound can be broken down by chemical reactions, mixture can be broken down by physical reactions

23
Q

parts of a chemical equation

A

reactants yield products

24
Q

the law of constant proportions is and how it relates to chemical formulas and chemical reactions

A

law of constant proportions – the numbers in a compound formula cannot be changed, ratios are constant

25
how was the law of constant proportions was shown in the decomposition of water lab and zinc in hydrochloric acid lab
2 hydrogens to one oxygen and the ratio stays the same
26
when a reaction uses up one of the reactants the reaction stops and relate this to the zinc in hydrochloric acid lab
Limiting reactant, runs out of one of two reactants, ran out of hydrochloric acid
27
how chemical reactions differ from physical reactions
bigger changes, minor changes, new substance, no new substance, heat change, minor heat change,