Middle School Science Content Knowledge

No matter what reaction or change occur in a chemical reaction, the total _______ of the substances does not change.

• mass

• multiplication

• properties

• chemical reaction

The amount of matter is ______ when it changes form, even if there are transitions in which the substance seems to vanish.

• conserved

• lost

• multiplied

• particles

Chemical reactions that release energy are called...

• endothermic

• exothermic

• endolastic

• exolastic

Some chemical reactions store energy. We call these reactions...

• endothermic

• exothermic

• endoplasmic

• none of these.

In a chemical process, the atoms that make up the original substances are regrouped into different molecules, and these new substances have different __________ of those of the reactants.

• atoms

• smells

• properties

• friends

________ of any type can be subdivided into particles that are too small to see, but even then the matter still exists and can be detected by other means.

• Matter

• Chemical Reactions.

• Protons

• Planets

The energy released from food was once energy from the ____ that was captured by plants in the chemical process that forms plant matter (from air and water).

• sun

• Earth

• moon

• plants

Food provides animals with the materials they need for body ____________ and the energy they need to maintain body warmth and for motion.

• cells and organ systems

• tissue and organs

• system checks

• repair and growth

Plants acquire their material for growth mainly from (select all that apply)

• air

• water

• dirt

• soil

• sand

Matter cycles between the air and soil and among ______, ______, & ________ as these organisms live and die.

• plants; animals; microbes

• plants; animals; energy source

• sun; Earth; moon

• atom; molecules; organelles