Term
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Definition
| the study of matter and how matter changes |
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Term
| What type of reaction is FeS+2 HCl -> FeCl2 + H2S? |
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Definition
| a double replacement reaction |
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Term
| Which of the following is NOT a corrent inference that you can make about the burning of gasoline? |
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Definition
| the reaction is a physical change |
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Term
| A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be |
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Definition
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Term
| Anything that has mass and takes up space is considered |
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Definition
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Term
| What happens when chemical bonds break and new bonds form? |
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Definition
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Term
| CaCO3 represents a chemical |
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Definition
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Term
| The only sure evidence for a chemical reaction is |
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Definition
| the production of one or more new substances |
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Term
| A shorter, easier way to show chemical reactions, using symbols instead of words, is called a |
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Definition
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Term
| The substances listed on the left side of a chemical equation are the |
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Definition
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Term
| In chemical reactions, what does the principle of conversation of mass mean? |
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Definition
| Matter is not created or destroyed |
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Term
| Which two processes could be considered opposites? |
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Definition
| a synthesis reaction and a decomposition reaction |
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Term
| A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a |
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Definition
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Term
| A chemical reaction that absorbs energy in the form of heat is decribed as |
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Definition
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Term
| The minimun amount of energy that has to be added to start a reaction is the |
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Definition
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Term
| Which of the following does NOT increase the number of particles of a substance available to react in a chemical reaction? |
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Definition
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Term
| A material used to decreases the rate of a chemical reaction is a(n) |
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Definition
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Term
| A rapid reaction between oxygen and a fuel is known as |
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Definition
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Term
| In what way can a fire be brought under control? |
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Definition
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Term
Which is the correct chemical equation for the following statement? Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide.
A. 2 Na + O2 -> Na2O
B. Na2O -> Na + O2
C. Na2O + O2 -> 2 Na
D. Na2 + O2 -> 2 NaO |
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Definition
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Term
| What is the best form of fire safety? |
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Definition
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Term
| The best way to put out a small fire in a kitchen is to |
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Definition
| cover it or use a home fire extinguisher |
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Term
| The principle of conservation of mass is true |
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Definition
| for reaction in both open and closed systems |
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Term
| When a chemical reaction takes place in an open system, |
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Definition
| matter can enter from or escape to the surroundings |
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Term
| In a chemical equation, numbers often appear in front of a chemical formula. These numbers tell you the |
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Definition
| number of molecules or atoms of each substance in the reaction. |
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Term
| Every chemical reaction involves a change in |
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Definition
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Term
| Chemicals that act as biological catalysts by speeding up reactions in living things are |
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Definition
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Term
| The number placed below an element's symbol in a chemical formula is called a |
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Definition
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Term
Which of the following is an example of exerting a force?
A. a child running through a feild
B. a train speeding down a track
C. a carpenter hammering a nail
D. an airplane soaring through the sky |
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Definition
| C. carpenter hammering a nail |
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Term
| What happens when two forces act in the same direction |
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Definition
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Term
| The tendency of an object to resist change in its motion is known as |
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Definition
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Term
| The greater the mass of an object, |
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Definition
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Term
| The force of gravity on a person or object on the surface of a planet is called |
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Definition
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Term
| One way to increase acceleration is by |
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Definition
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Term
| The force that one surface exerts on another when the two rub against each other is called |
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Definition
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Term
Which of the following is an example of rolling friction?
A. your shoes on a sidewalk as you walk
B. bike tires on the road as you ride
C. a boat on water
D. two hands rubbing together |
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Definition
| B. bike tires on the road as you ride |
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Term
| When the only force acting on a a falling object is gravity, the object is said to be |
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Definition
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Term
| Air resistance is a type of |
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Definition
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Term
| The force of gravity on a person or object at the surface of a planet is knows as |
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Definition
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Term
| The law of universal gravitation states that any two objects in the universe, without exception, |
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Definition
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Term
| Forces can be added together only if they are |
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Definition
| acting on the same object |
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Term
| The product of an object's mass and velocity is called its |
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Definition
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Term
| According to the law of conservation of momentum, when two objects collide in the absence of friction, |
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Definition
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Term
| The achievement of lifting a rocket off the ground and into space can be explained by |
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Definition
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Term
| What is required for a rocket to lift off into space? |
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Definition
| thrust that is greater than Earth's gravity |
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Term
| An object that travels around the another object in space called a(n) |
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Definition
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Term
| Any force that causes an object to move in a circle is called a(n) |
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Definition
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Term
| In physical science, a push or a pull is called a(n) |
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Definition
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Term
| The momentum of an object is in the same direction as its |
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Definition
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Term
| How can you increase the momentum of an object? |
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Definition
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Term
| The amount of matter in an object is called its |
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Definition
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Term
| Which of the following is an example of increasing friction intentionally? |
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Definition
| throwing sand on an icy driveway |
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Term
| The force that pulls falling objects toward Earth is called |
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Definition
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Term
| Objects falling through air experience a type of friction called |
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Definition
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Term
| According to Newton's third law of motion, when hammer strikes and exerts force on a nail, the nail |
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Definition
| exerts an equal force back on the hammer. |
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Term
| The SI unit for force is the |
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Definition
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Term
| Balanced forces acting on an object |
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Definition
| never change the object's motion. |
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Term
| The total momentum of a group of objects is conserved unless |
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Definition
| outside forces act on the object |
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Term
| Snowshoes enable a person to walk on deep snow because the snowshoes |
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Definition
| increase the area over which the person's weight is distributed |
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Term
| A unit of pressure is called a |
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Definition
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Term
| Air pressure exerted equally on an object from different directions is |
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Definition
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Term
| Given that the air pressure outside your body is so great, why aren't you crushed? |
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Definition
| Pressure inside your body balances the air pressure outside your body |
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Term
| Air pressure decreases as |
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Definition
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Term
| Water pressure increases as |
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Definition
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Term
| Which type of substance does Pascal's principle deal with? |
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Definition
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Term
| One application of Pascal's principle is |
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Definition
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Term
| What scientific rule decribes why water squirts from a plastic bottle when it is squeezed? |
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Definition
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Term
| What does a hydraulic system do? |
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Definition
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Term
Which of the following is true of buoyant force?
A. It acts in the downward direction
B. It acts with the force of gravity
C. It acts in the upward direction
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Definition
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Term
| What effect does a buoyant force have on a submerged object? |
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Definition
| It causes a net force acting upward on the object |
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Term
| If an object floats, the volume of displaced water is equal to the volume of |
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Definition
| the portion of the object that is submerged |
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Term
| What scientific rule states that the buoyant force on an object is equal to the weight of the fluid displaced by the object? |
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Definition
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Term
| When water fulls a submarine's flotation tanks, the overall density of the submarine |
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Definition
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Term
| A ship stays afloat as long as the buoyant force is |
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Definition
| equal to the ship's weight |
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Term
| Passcal's principle states that when force is applied to a confined fluid, the change in pressure is transmitted |
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Definition
| equally to all parts of the fluid |
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Term
| Smoke rises up a chimney partly because of |
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Definition
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Term
| Bernoulli's principle helps to explain |
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Definition
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Term
| The mass per unit volume of a substance is its |
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Definition
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Term
| An object that is more dense than the fluid in which it is immersed will |
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Definition
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Term
Which of these substances is the LEAST dense?
A. wood
B. copper
C. mercury
D. rubber |
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Definition
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Term
| Pressure can be measured in units of |
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Definition
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Term
| A substance whose shape can easily change is a |
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Definition
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Term
| A material that can easily flow is called a |
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Definition
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Term
| What scientific rule states that the pressure exerted by a moving stream of fluid is less than the pressure of the surrounding fluid? |
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Definition
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Term
| The pressure in the deepest parts of the ocean is roughly how many times the usual air pressure you experience? |
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Definition
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Term
| Which of these multiplies a force by transmitting it to a large surface area? |
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Definition
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Term
| The braking system on a car is an example of |
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Definition
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Term
| A barometer is used to measure pressure |
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Definition
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Term
| When an object's distance from another object is changing, |
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Definition
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Term
| The basic SI unit of length is the |
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Definition
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Term
| Speed equals distance divided by |
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Definition
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Term
| When you know both the speed and direction of an object's motion, you know the |
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Definition
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Term
| You can show the motion of an object on a line graph in which you plot distance against |
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Definition
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Term
| The steepness of a line on a graph is called the |
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Definition
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Term
| The rate at which velocity changes is called |
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Definition
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Term
Which of these is an example of deceleration?
A. a bird taking off for flight
B. a roller coaster moving down a steep hill
C. a car approaching a red light
D. an airplane following a straight flight path |
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Definition
| a car approching a red light |
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Term
| To determine the acceleration rate of an object, you must calculate the calculate the change in speed during each unit of |
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Definition
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Term
| If speed is measured in kilometers per hour and time is measured in hours , the unit of acceleration is |
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Definition
| kilometers per hour per hour |
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Term
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Definition
| the total distance traveled divided by the total time |
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Term
| As Earth orbits the sun, it is moving about |
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Definition
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Term
| A place or object used for comparison to determine if something is in motion is called |
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Definition
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Term
| On a graph showing distance versus time, a horizontal line represents an object that is |
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Definition
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Term
| The International System of Units is used |
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Definition
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Term
| If you know the distance an object has traveled in a certain amount of time, you can determine |
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Definition
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Term
| It is rare for any motion to |
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Definition
| stay the same for very long |
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Term
| If the speed of an object does NOT change, the object is traveling at a |
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Definition
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Term
| Changing direction is an example of a kind of |
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Definition
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Term
| If a bicyclist travels 30 kilometers in two hours, her average speed is |
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Definition
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Term
| The moon accelerates because it is |
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Definition
| continuoulsy changing direction |
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Term
If an object moves in the same direction and at a constant speed for 4 hours, which of the following is true?
A. The object's speed changed during the 4 hours.
B. The object's velocity did not change
C. The object accelerted during the 4 hours.
D. The object decelerated during the 4 hours. |
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Definition
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Term
| If you know a car traveled 300 kilometers in 3 hours, you can find its |
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Definition
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Term
| In an acceleration graph showing speed versus time, a straight line shows the acceleration is |
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Definition
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Term
| What kind of line on a distance-versus-time graph indicates that the object is accelerating? |
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Definition
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Term
| A classroom measures 4.33 meters wide. How wide is the classroom in centimeters? |
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Definition
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Term
| Kilo- is a prefix that means |
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Definition
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Term
| A car travels 85 km in the first hour of a trip. The car continues to travel for 2 more hours and travels 200 km. What was the average speed of the car for the trip? |
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Definition
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Term
| Which of the following is the correct equation for acceleration? |
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Definition
acceleration= (final speed-initial speed)
time
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