Chemical Reactions, Matter and Energy

What is a chemical reaction?

• a change in matter when the molecules rearrange to make new molecules

• a change in matter when matter changes its form or appearance

• a change in matter when the physical appearance changes

• a very boring change in matter

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This image shows a

• chemical reaction

• physical change

• musical change

• all of these answers are correct

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The reactants in the image above are:

• CH4 and 2 O2

• 2 H2O and CO2

• All of these are reactants

• All of these are products

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The products in the image above are:

• CH4 and 2 O2

• 2 H2O and CO2

• All of these are reactants

• All of these are products

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A burning candle is the process of transforming--

• heat energy into chemical energy

• chemical energy into light and heat

• chemical energy into mechanical energy

• chemical energy into nuclear energy

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Match the following

• Mechanical

•  light energy

• Electrical

• moving matter

• Chemical

• movement of charged particles

• Radiant/electromagnetic

• energy stored in bonds. When bonds break energy is release as ATP

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A Red Giant burns through it Hydrogen and then uses Helium as fuel. What is the byproduct of this process? (a)  

• Magnesium

• Iron

• Silicon

• Carbon

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When energy like heat and light are given off in a chemical reaction it is called

• exothermic

• endothermic

• eccentric

• ectomorphic

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When energy is absorbed and taken in during a chemical reaction it is called

• exothermic

• endothermic

• eccentric

• ectomorphic

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When the matter in a chemical reaction gets colder it is called

• exothermic

• endothermic

• eccentric

• endomorphic

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