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91 Cards in this Set
- Front
- Back
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What phase of matter has a definite shape and volume?
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a Solid
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What phase of matter has an indefinite shape and indefinite volume?
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a Gas
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What phase of matter has an indefinite shape and a definite volume?
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a Liquid
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A phase change of liquid to solid is called?
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Freezing
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A phase change from solid to liquid is called?
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Melting
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A phase change from solid to gas is called?
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Sublimation
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A phase change from gas to liquid is called?
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Condensation
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Two or more substances mixed togeher, but not chemically combined.
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Mixture
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What happens to the heat energy of the molecules when a liquid becomes a solid?
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Heat energy is released.
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The distance between molecules in a solid as compared to a gas are
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Closer together.
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What phase of matter has a definite shape and volume?
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a Solid
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What phase of matter has an indefinite shape & volume?
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a Gas
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What phase of matter has an indefinite shape and a definite volume?
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a Liquid
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A phase change from liquid to solid is called?
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Freezing
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A phase change from solid to liquid is called?
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Melting
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A mixture is described as
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2 or more substances mixed together, but not chemically combined.
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A compound is described as
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2 or more substances chemically combined. The new substance has new physical and chemical properties.
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When water turns to ice, what happens to the heat energy of the molecules?
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The heat energy is released.
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When a phase change occurs from a gas to a solid, what happens to the space between the molecules?
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The molecules get closer together.
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What do you get when you divide the mass of an object by its volume?
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Density
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Physical properties of a substance would include
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1.density
2.texture 3.color 4.phase 5.malleability 6.ductibility |
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Chemical properties of a substance would include
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How the substance reacts with another substance.
1.rust formation 2.flammability |
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The amount of water displaced by a sample will tell you the
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Volume of the sample
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How will liquids of varied densities be arranged in a container?
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From most dense to least dense, the most dense on the bottom.
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What is the metric units of length?
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Meter, centimeters, milli meters
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Electrons are arranged around a nucleus in paths called?
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Energy levels
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How are the elements arranged on the peridic table?
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According to their atomic number.
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What can't be broken down into a simpler form & has only one kind of atom?
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an Element
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How many elements make up 1 water molecule? H20?
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2
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What is the chemical symbol for oxygen?
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O
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What is the chemical for nitrogen?
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N
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What is the chemical symbol sodium?
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Na
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What is the chemical symbol for helium?
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He
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What is the symbol for carbon?
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C
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What is the chemical symbol for chlorine?
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Cl
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How many atoms are in a molecule of H4SO4?
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Nine,4 H,1 S,4 Oxygen
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What bonds form between metals and nonmetals?
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Ionic bonds
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In ionic bonds, what happens to some electrons?
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Electrons are transferred.
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What type of bonds form between two nonmetals?
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Covalent bonds
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In covalent bonds, what happens to some electrons?
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Electrons are shared
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What happens to the properties of substances when chemically combined?
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New properties are observed.
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What do #1 and #2 represent?
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1. atoms
2. chemical bonds |
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What can happen to the energy involved in a chemical change?
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It is either released or obsorbed.
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What's on the right side of a chemical equation?
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Products
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What's on the left side of the arrow in a chemical equation?
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Reactants
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Experiment that includes a sample without the variable.
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A controlled experiment
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What is the purpose for a control in an experiment?
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A control is used as a comparison.
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A substance that changes the rate of a chemical reaction.
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Catalyst
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What can change the rate of a chemical reaction?
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surface area,concentration,temp.,pH
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What effect does temperature have on reaction rate?
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As temp. increases the rate of reaction increases.
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A substance with a pH of 3 is an
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Acid
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A substance with a pH of 10 is a
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Base
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A substance with a pH of 7 is considered to be
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Neutral
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What can separate the parts of a mixture?
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filtering,evaporation,magnet,
allowing it to settle |
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Which of Newton's Laws applies when rowing a boat?
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Newton's Third Law -(action/reaction)
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Unequal forces will cause a red wagon to move in what direction?
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In the direction of the larger force.
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The slope of a line on a distance/time graph indicates what?
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The speed of an object.
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How is slope related to speed on a distance/time graph.
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The larger the slope the faster the object is moving.
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The force that opposes the motion of an object
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Friction
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What are three ways you can overcome friction?
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1.adding wheels
2.adding a lubricant 3.have a smooth surface to move object on. |
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Describe the forces on a seasaw that's not moving & level.
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They would be balanced and equal.
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A train stops short,everyone lunges forward.What law applies?
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Newton's 1st Law - Law of inertia.
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How is gravity effected by mass?
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Greater mass, greater the force of gravity on it.
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How does mass effect force?
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Larger the mass, larger the force .
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What is the scientific definition of work?
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Movement & direction of force are in the same direction.
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What type of energy always involves motion?
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Kinetic energy
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What type of energy is determined by position?
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Potential energy
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When energy is transferred, the total amount
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Remain the same. (Law of conservation of energy)
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1.Work divided by time 2.measured in watts
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Power
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What is the energy transferance when you turn on a lamp?
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Electrical to Light
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Which subatomic particle can change position & alter charge.
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Electrons
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Like charges will always do this
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Repell each other
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Unlike charges will always do this
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Attract each other
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What materials make good conductors of electricity?
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Metals
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Rubber & plastic can prevent you from gettig an electric shock. Why?
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They are good insulators.
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To light a bulb,the path of electrons in the circuit must be
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Complete and unbroken
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1.Volts divided by amps
2.measured in ohms |
Resistance
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Force that opposes the flow of electrons in a current
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Resistance
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How does the position of domains determine the strenth of a magnet?
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More domains facing the same direction,the stronger it is.
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How is the electromagnet spectrum organized?
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Longest to shortest wavelengths
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How are frequency and wavelenth related?
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The higher the frequency the shorter the wavelength.
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The distance between two crests or two troughs
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Wavelength
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What is the measure of distance from crest or trough to rest position?
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Amplitude
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The pitch of a siren coming towards a person will
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Increase due to Doppler effect
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The pitch of a siren that has passed a person will
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Decrease due to Doppler effect
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How does density of a medium effect the speed of sound?
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The greater the density the faster sound will travel through it.
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Light waves that hit an object& bounce back have been
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Reflected
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When light waves hit an object and the waves seem to remain within the object, the waves have been
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Obsorbed
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Light waves that hit an object & pass through it are
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Tranmitted
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What happens when we see the color blue?
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All waves are being obsorbed except the blue ones.
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What happens to light as it passes through different mediums?
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It is refracted.
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