Herold 8th Grade Sci
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is matter? | anything that takes up space and has mass
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| What is mass? | the amount of "stuff" in an object
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| What is weight? | how mass is affected by gravity
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| What is the Law of Conservation of Mass? | matter cannot be created or destroyed
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| Why does gasoline float on top of water? | gasoline is less dense than water
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| What is density? | the amount of matter in a specific spacethe ratio of mass to volume
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| List the characteristics of a solid? | definite shape, definite volumeparticles are close together
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| List the characteristics of a liquid | takes the shape of its container, definite volumeparticles are close together but can slide past each other
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| List the characteristics of a gas | no definite shape, no definite volumeparticles are far apart
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| What are two physical properties of water at 0 degrees C? | it is a solid and a liquid (water freezes and melts at this temperature)
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| If you pour five different density liquid into a graduated cylinder, where would you find the liquid with the greatest density? | At the bottom
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| What is energy? | The ability to do work
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| What direction does a magnetic field flow? | From north to south
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| Any disturbance that transmits energy through matter or space | Wave
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| What is the name of the substance that a wave travels through? | Medium
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| What is the lowest point between each crest called? | trough
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| What is the highest point of a wave? | Crest
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| A mechanical wave needs what to travel through? | Matter
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| Can an electromechanical wave travel through space? | Yes
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| What is the distance between any two identical points on a wave? | Wave length
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| The number of events (or waves) in a given amount of time | Frequency
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| Frequency is measured in this | Hertz is waves per second
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| What component of a wave controls loudness | amplitude
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| What component of a wave controls pitch | frequency
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| When a wave bounces off a surface or an object | reflection
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| What kind of reflection a mirror has | regular reflection
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| In what direction does a transverse wave vibrate | perpendicular to the direction of the wave
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| In what direction does a longitudinal wave vibrate | parallel to the direction of the wavehas parts called compressions and rarefactions
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| What kind of reflection does a counter top have? | Diffuse reflection
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| Any push or pull on an object | force
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| A force that opposes all objects in motion | friction
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| When net forces are not equal to zero | unbalanced force
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| What kind of force causes a change in motion | unbalanced force
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| When net forces are equal to zero | balanced force
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| What kind of force will not cause a change in motion | balanced force
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| Two things that speed depends on | time and distance
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| What is velocity | time, distance, and direction
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| How does air resistance affect a falling object? | slows it by applying force in the opposite direction
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| Newton's First Law of Motion | an object in motion will stay in motion, an object at rest will stay at rest
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| Newton's Second Law of Motion | acceleration depends on mass and amount of force applied F= m x a
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| Newton's Third Law of Motion | For every action there is an equal but opposite reaction
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| Resources that are used faster than they can be replaced by nature | Nonrenewable resources
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| Resources that can be replaced as they are used | Renewable resources
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| What is found in the nucleus of an atom? | Protons and neutrons
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| What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common? | contributed a part to current atomic theory
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| Were are electrons likely to be found? | surrounding the outside of the nucleus in an electron cloud
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| Smallest particle into which an element can be divided | atom
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| In an atom, the part with the least mass | electrons
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| Where metalloids are located on the periodic table | between metals and nonmetals
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| What the components of a block on the periodic table | chemical symbol - the name of the elementatomic number - number of protonsatomic mass/weight - weight of an atom(found by adding protons and neutrons together)
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| Definition of physical science | the study of matter and energy; the study of non-living things
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| List the steps in the scientific method | observationrecognize the problemform a hypothesisanalyze the datadraw conclusionsshare results(Ralph Fell To Another Death Suddenly)
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| What we use to gather observations | our senses
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| Define observation | using the senses to describe the natural world
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| Define inference | an explanation based on facts, but not direct observations.
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| Key ingredient in an hypothesis | it must be testable
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| Independent variable | the variable that is changed
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| Dependent variable | the variable that is not being measuredthe result that depends on the independent variable
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| Constant | the variables that are kept the same
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| control | the standard for comparisonthe "normal" condition
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| Tools to analyze data | Charts and graphs
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| Scientific theory | A set of ideas that tie together many observations
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| Scientific law | Descrrbes how some part of nature acts under certain conditions
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| The section of a science fair project that answers whether or not the hypothesis was supported | conclusion
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| Two factors necessary for a valid experiment | multiple trialscan be done (replicated) by others
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| Two ways a hypothesis can be written | if...thenI predict...
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| Arsenic (As) ... metal, nonmetal, or metalloid? | metalloid
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