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WorksheetsScience Pass Item Sampler
Total questions: 75
Worksheet time: 36mins
Students conducted an experiment to determine if unknown liquids were acids or bases. What was the independent variable in this investigation?
Sample
Indicator
Color change
Identification
Students placed steel wool in beakers of four different liquids in order of the most acidic to neutral. The students recorded their observations in the table. Which is the best conclusion in the table?
The more acidic the substance, the faster it reacts with wool.
The more acidic the substance, the faster the steel wool turns to a gas.
The less acidic the substance, the faster the steel wool becomes covered with air bubbles.
The less acidic the substance, the faster the steel wool changes color.
Liquids can be described as having
definite shape and volume
definite volume but no shape
no definite shape or volume
particles in fixed positions
The smallest particle of an element that has the properties of that element is a(n)
ion
compound
atom
nucleus
Which of the following is a physical property?
How easily a substance reacts with another substance
How easily a substance corrodes
How easily a substance conducts heat
How easily a substance forms compounds
What does the pH of drain cleaner (ph=14) indicate about the dangers of such a product?
It is a strong acid
It is a weak acid
It is a strong base
It is a weak base
A substance that tastes sour, reacts with metals and carbonates, and turns blue litmus red is a(n)
element
salt
base
acid
What does a neutralization reaction produce?
an acid
an acid and a base
water and a salt
carbonated water
Which of the following is a description of a gas?
Definite shape and volume
Definite volume but no shape
No definite shape or volume
Particles in fixed positions
The difference between organic and inorganic compounds is
organic compounds do not contain carbon
organic compounds contain carbon
organic compound and inorganic compounds both do not contain carbon
organic compound and inorganic compounds both contain carbon
The density of known substances are in the table below.
Copper
Lead
Aluminum
Steel
How is the modern model of an atom different from the Bohr atomic model?
The masses of the atomic particles are different.
The numbers of electrons are different.
The shapes of the nuclei are different.
The arrangements of the electrons are different.
The shaded row in the table is called the __.
Column
Family
Group
Period
Which of the following lists the elements in order from those having the least protons to those having the most protons in the atoms?
O, N, B, Li
Na, S, Al, Cl
O, S, Se, Te
Rb, K, Na, Li
Which of the following elements has 16 protons?
Oxygen
Chlorine
Sulfur
Germanium
Which of these elements has an atomic number of 14?
N
Al
Si
P
Which of these cannot be separated into its parts by an ordinary chemical or physical process?
A mixture of salts (NaCl, KI)
A compound of nitrogen (NH3)
An atom of carbon (C)
An acid of chlorine (HCl)
Dalton inferred that atoms of each element
contain protons and neutrons
contain a nucleus
have a unique mass
have the same mass
The attraction between two oppositely charged ions is call a(n)
molecular attraction
double bond
covalent bond
ionic bond
According to this equations, what happened to the carbon and oxygen?
They combined chemically to form a new compound.
They combined chemically to form carbon and oxygen.
They combined physically to form a new mixture.
They combined physically to form a new element.
Ca + 2H2O → Ca(OH)2 + H2
How many different elements are involved in the chemical reaction above?
1
2
3
4
Calcium metal (Ca) can be produced by passing an electric current through molten calcium chloride (CaCl2). Chlorine gas (Cl2) is also formed. What is the balanced equation for this reaction?
2CaCl → Ca + 2Cl
CaCl2 + H2O → Ca + ClH + O2
CaCl2 + Cl → Ca + Cl3
CaCl2 →Ca + Cl2
In an experiment combining vinegar and baking soda, gas is given off. In this chemical reaction, the vinegar and baking soda are
reactants
products
elements
suspensions
If you break a piece of glass, the shape of the glass changes, but the properties in the fragments remain the same. Which of the following has occurred?
A chemical change
A temperature change
A phase change
A physical change
Which of these is a change in chemical composition?
a lake freezes solid
gravel, sand, and water are mixed
a copper bar is rolled into a flat sheet
vinegar bubbles when baking soda is added
Tearing paper is an example of a
chemical change
chemical reaction
solution
physical change
Energy released by joining nuclei of atoms together is
nuclear fission
nuclear fusion
nuclear splitting
chain reactions
Which of the following is an example of potential energy?
A glass jar sitting on a shelf
A flag waving in the wind
A ball rolling along a sidewalk
A battery powering a radio
Which energy transformation occurs first in a coal-burning power plant?
Chemical energy to thermal energy
Thermal energy to mechanical energy
Thermal energy to electrical energy
Mechanical energy to electrical energy
Which of these best describes the particle motion taking place as gas is exposed to freezing temperatures
The particles decrease in speed.
The particles move with more force.
The motion of the particles becomes random.
The motion of the particles is unchanged.
A metal spoon was placed in a dish of ice cream and became cool. Which correctly describes the heat transfer process that resulted in the cooling of the spoon?
Conduction, because the spoon was in contact with the cold ice cream.
Convection, because the spoon was in contact with the cold ice cream.
Conduction, because cold air currents affected the temperature of the spoon.
Convection, because cold air currents affected the temperature of the spoon.
Which of these properties of an unknown liquid can be found using a beaker, hot plate, and a temperature probe?
Density
Boiling point
Oxygen level
Chemical composition
The volume of water in the pot decreases during this investigation. Water droplets form on the mirror when positioned over the pot. In this setup, water __.
Vaporizes and then freezes
Vaporizes and then condenses
Condenses and then vaporizes
Freezes and then vaporizes
Which of these represents the freezing point of water in correct SI units?
0°C
0°
32°F
273
The location on the track where the train has the greatest potential energy is
1
2
3
4
An example of kinetic energy continuously being changed to potential energy and back again might be
a girl swinging on a swing
a train moving down a track
electric charges moving in a straight path
a plate sitting on the edge of a table
Between points 4 and 5, energy is being used to change water from a
solid to a liquid
solid to a gas
liquid to a gas
liquid to a solid
Which of these will cause water to change to ice?
Removing heat from water
Stirring the water
Adding salt to the water
Putting the water in the sunlight
As the frequency of a wave decreases, the wave's __
period decreases
amplitude increases
speed decreases
wavelength increases
Sound waves are unable to travel through __.
air
a vacuum
water
a rock
During a fireworks show, a family sees the spray of sparkles from an exploding firework high in the sky and, a moment later, hears the pop. Which of these best explains why the pop and spray do not seem to occur at the same time?
Light and sound travel through air.
Sound travels through a vacuum.
Sound travels slower than light.
Light and sound travel at the same speed.
The illustration shows a wave. The wave's wavelength is the distance between point ____.
1 and 2
1 and 4
2 and 3
2 and 4
How is sound produced?
by electromagnetic waves
by making a material vibrate at a frequency that can be heard
by causing molecules in a solid to vibrate
by pushing on a material
The maximum distance that particles of a medium carrying waves move away from their rest positions is the wave's
frequency
pitch
amplitude
wavelength
The pitch of a sound that a person hears depends on the sound wave's
loudness
frequency
intensity
amplitude
What occurs when vibrations traveling through an object match the object's natural frequency?
diffraction
reflection
refraction
resonance
The bending of waves around the edge of a barrier is known as
reflection
diffraction
refraction
interference
Which is the result of using a more powerful motor to run an elevator?
The same amount of work is done in less time.
Less work is done in the same amount of time.
The same amount of time is needed to move the same distance.
A longer time is needed to move a shorter distance.
To complete a project, 200,000 Joules of work are needed. The time taken to complete the project is 20 seconds. How much power is needed?
P=w/t
0.0001 J/s
10,000 J/s
200,020 J/s
1,000,000 J/s
A car manufacturer reduces the mass of a car by 250 kg. If the new design is otherwise identical to the old design, how will the new car compare to the old car?
It will have a greater gravitational attraction to the road.
It will require more fuel to operate.
It will need less force to move.
It will release more gas emissions.
A wheel-and-axle is a lever that rotates around a fixed point. All of the following machines employ a wheel-and-axle except a
bicycle
skateboard
pencil sharpener
crowbar
At what speed would a car have to move in order to travel 20 km in two hours?
5 km/hr
10 km/hr
20 km/hr
40 km/hr
A girl jumps forward off a boat. According to Newton's third law of motion, what happens to the boat?
it also moves forward
it remains motionless
it moves backward
it sinks
In which example is the least amount of work done?
lifting a 20 N box to a height of 1 m
lifting a 20 N box to a height of 2 m
using a force of 20 N to push a box 3 m
using a force of 10 N to push a box 6 m
A student sets four balls rolling at the same speed. Ball 1 has a mass of 9 kg, ball 2 has a mass of 8 kg, ball 3 has a mass of 5 kg, and ball 4 has a mass of 3 kg. Which ball will hit the bowling pins with the most force?
Ball 1
Ball 2
Ball 3
Ball 4
A student used a ruler to measure the distance a snail traveled along the sidewalk. What was the snail's average speed for these five minutes?
0.31 cm/min
0.70 cm/min
0.76 cm/min
1.26 cm/min
When a moving car stops suddenly, the riders in the car continue to move forward because of
friction
gravity
inertia
centripetal force
Which of the following is an example of static electricity?
A dry-cell battery connected to wires lights up a light bulb.
A balloon sticks to a wall after it is rubbed with a piece of wool.
A magnet sticks to a refrigerator door made of metal.
A light switch that is turned on runs a ceiling fan.
Laundry in a clothes dryer often becomes charged with static electricity while drying. Which of these best explains why a clothes dryer often generates static electricity?
Short circuits in the dryer charge the laundry.
Clothes with metal pieces conduct electricity in the dryer.
Electrons are transferred as clothes rub against each other in the dryer.
Heat from the dryer charges the air and produces lightning.
A group of campers travels to a cabin which has no electrical power. In order to provide the power for a heater and lights, which device would be appropriate?
A resistor
An insulator
A generator
A voltmeter
What change will most likely increase the strength of a magnetic field produced by an electromagnet?
Reduce the number of turns of the coil
Switch the direction in which the battery is connected
Remove the iron nail
Add a battery
In order to turn on the light, a piece of wire needs to be connected from
A to C
A to D
B to C
C to D
Which of the following is shown in this diagram?
Alternating current
Short circuit
Series circuit
Parallel circuit
Both light bulbs are lit in the circuit. In order to turn off both lights, select the location where a switch must be installed in the circuit.
1
2
3
4
An electric current produces a(n)
magnetic domain
magnetic field
electrical resistance
permanent magnet
Which of the following convert mechanical energy into electrical energy?
both generators and electric motors
generators
electric motors
transformers
The strength of an electromagnet will be increased if
the current in the wire is decreased
the number of loops in the wire is decreased
a stronger ferromagnetic materials is used for the core
the thickness of the insulation on the wire is increased
This is used to measure weight
scale
microscope
telescope
balance
