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