Science Chapter Review

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The capacity to do work is described as

energy

Neither matter nor can be created or but they can be from one to another.

energy destroyed converted form

Everything in the physical universe, left to itself, moves to a state of entropy.

higher

If this were a frictionless plane, what would be the mechanical advantage?

6H/H=6

If the work output for a machine is 450 ft·lb and the work input is 600 ft·lb, what is the efficiency of the machine?

75%

Lightning represents a high discharge of electricity

static

6 CO2 + 12 H2O C6H12O6 + 6 H2O + 6 O2 Check the molecules that represent the source where glucose obtains its carbon.

6CO2

6 CO2 + 12 H2O C6H12O6 + 6 H2O + 6 O2 atoms of carbon are involved in this reaction.

12

How many atoms of hydrogen does alcohol (2C2H6O) have?

12

6 CO2 + 12 H2O C6H12O6 + 6 H2O + 6 O2 hydrogen atoms are involved in this reaction.

24

6 CO2 + 12 H2O C6H12O6 + 6 H2O + 6 O2 molecules of carbon dioxide gas combine with water in photosynthesis.

6

Any energy conversion process ultimately produces

Heat

Potential energy is released whenever an object

Falls

Machines are 100% efficient.

False

When high velocity water strikes turbine blades is converted to

Kentic Energy mechanical energy

Heat is energy

True

The lowest temperature possible is:

absolute zero

Which devices may overtax a community's electric power?

air conditioners

Why must both sides of a chemical equation balance?

all of the above

If matter cannot be created or destroyed within the physical universe, then the total quantity must be

constant

The transfer mechanism of heat through gases and liquids by circulating currents is called

convection

The resistance of moving surfaces produces

friction

What happens to the density of nearly all objects as they cool down?

it increases

Atomic energy is stored within the of an atom.

nucleus

To find the mechanical advantage of any machine, take the force and divide by the force

output input

An atom which loses an electron becomes charged.

positively


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