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UKA 9.1 Science Test 4

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  • Bases are compounds that _____ hydrogen ions.
    accept
  • Acceleration is the rate at which an object's _____ changes.
    velocity
  • _____ forces cause an object to accelerate.
    Unbalanced
  • Neutralization reactions between _____ and bases are exothermic, meaning they release energy in the form of heat.
    acids
  • Electromagnets are _____ magnets, as opposed to permanent magnets.
    temporary
  • The unit for moments is the _____-meter (Nm).
    newton
  • You can make a battery out of an acid, such as a lemon, and two _____ with different reduction potential.
    metals
  • Balanced forces do not cause a change in _____.
    motion
  • The magnetic field lines around a vertical current-carrying wire form _____ circles.
    concentric
  • Since Oersted's discovery, electromagnets have found _____ applications.
    numerous
  • Oersted's discovery in _____ revealed the connection between electricity and magnetism.
    1820
  • Electromagnets are used in small devices for picking up _____.
    paperclips
  • A turning force is affected by the distance of the _____ from the pivot point.
    force
  • A moment increases with greater _____ from the pivot.
    distance
  • Increasing the _____ of coils in an electromagnet increases its magnetic field strength.
    number
  • _____ first discovered the magnetic effect of electric currents in 1820.
    Oersted
  • Speed is calculated by dividing _____ by time.
    distance
  • A moment is calculated by multiplying the _____ by the perpendicular distance from the pivot.
    force
  • Unlike _____ magnets, electromagnets can be turned on and off.
    permanent
  • A lemon battery creates a small circuit, which can be used to _____ devices like an LED light for a short time.
    power
  • Bases have a lower concentration of H+ ions and a higher concentration of _____ (OH-) ions.
    hydroxide
  • This is because the force acts over a greater _____, creating a larger turning effect.
    distance
  • A lemon battery works because the _____ ions in the lemon creates a path for electrons to flow through.
    hydrogen
  • The turning effect of a force is measured by its _____.
    moment
  • Electromagnets are useful due to their _____ magnetic fields.
    controllable
  • Electromagnets are used in a wide range of _____, from small devices to large industrial machines.
    applications
  • _____ forces do not cause a change in motion.
    Balanced
  • When the current is flowing through a _____ wire, the magnetic field lines form concentric circles around the wire.
    vertical
  • The magnetic field can also be increased by increasing the strength of the _____.
    electric current
  • The strength of an electromagnet's magnetic field depends on the _____ of the electric current.
    strength
  • The magnetic field produced by the electromagnet can be increased by increasing the number of _____.
    coils
  • A lemon battery creates a small _____, which can be used to power devices like an LED light for a short time.
    circuit
  • A lemon battery works because the hydrogen ions in the lemon creates a path for _____ to flow through.
    electrons
  • Acids are chemical compounds that donate _____ ions (H+) in solution.
    hydrogen
  • Unbalanced forces cause an object to _____.
    accelerate
  • To calculate the _____ released, mix the solutions and measure the highest temperature reached.
    energy
  • The two metals used in a lemon battery should have different reduction potential, which is the tendency to lose _____.
    electrons
  • If the wire is _____, the magnetic field becomes stronger.
    coiled
  • The turning effect of a force is measured by its moment, which increases with greater force or _____ from the pivot.
    distance
  • To calculate the energy released, mix the solutions and measure the highest _____ reached.
    temperature
  • The heat potential from neutralization reactions means you can _____ food with acid.
    cook
  • You can make a battery out of an acid, such as a _____, and two metals with different reduction potential.
    lemon
  • The magnetic field of a coiled wire is further strengthened by the addition of an _____ core.
    iron
  • Electromagnets allow magnetic fields to be _____ on and off.
    turned
  • Use the equation: energy = (volume of acid + volume of base) × 4.12 × temperature _____.
    change
  • Acids have a higher concentration of H+ ions compared to _____.
    water
  • If you apply the same force further from the pivot, the turning force _____.
    increases
  • The force acts over a greater distance, creating a larger turning _____.
    effect
  • Bases have a _____ concentration of H+ ions and a higher concentration of hydroxide (OH-) ions.
    lower
  • A turning force is affected by the _____ of the force from the pivot point.
    distance
  • The _____ of the magnetic field lines around a current-carrying wire can be visualized with a compass.
    direction
  • Neutralization reactions between acids and bases are _____, meaning they release energy in the form of heat.
    exothermic
  • A moment is the turning _____ of a force.
    effect
  • The _____ potential from neutralization reactions means you can cook food with acid.
    heat
  • Large industrial electromagnets are used for moving heavy objects like _____.
    scrap metal
  • An electromagnet's core is typically made of _____.
    iron
  • When an object is balanced, the sum of the clockwise moments equals the sum of the _____ moments.
    anticlockwise
  • The ability to control the magnetic field is a key advantage of _____ over permanent magnets.
    electromagnets
  • A moment increases with greater _____ or distance from the pivot.
    force
  • Speed is the rate at which an object covers _____.
    distance
  • The _____ of the magnetic field produced by an electric current can be determined using a compass.
    direction
  • An electromagnet is a type of magnet that is created by passing _____ through a wire coil.
    an electric current
  • Large electromagnets can be found in _____.
    junkyards
  • Acids are chemical _____ that donate hydrogen ions (H+) in solution.
    compounds
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