Physical Science FER (Part 2)

this unbalanced equation represents a chemical reaction: Pb(NO₃)₂ + NaI → NaNO₃ + PbI₂

what is the coefficient for NaI once the equation is balanced?

• 1

• 2

• 3

• 4

what type of bond will form when an element from group 2 bonds with an element from group 17

• hydrogen bond

• covalent bond

• metallic bond

• ionic bond

which info can be determined from the litmus paper tests

• solutions 1 and 5 are both acids

• solutions 2 and 8 are both neutral

• solutions 3 and 6 are both bases

• solutions 4 and 7 are both acids

a 100 - gram sample of cerium-143 has a half life of 33 hours. how long will it take until there are only 6.25 grams of cerium-143 left?

• 66 hours

• 99 hours

• 132 hours

• 165 hours

if the temperature of each metal were increased from 20 C to 25 C, which metal would require the least amount of heat to raise its temperature ?

• copper

• gold

• nickel

• titanium

Thallium-208 has a half life of 3 min. how long will it take 60.0g of thallium-208 to decay so that 15.0g of the thallium-208 remains?

• 3 min

• 6 min

• 9 min

• 12 min

A 200-kg rock is at the top of a cliff. what happens to its energy as it begins to fall?

• its kinetic energy is transformed into potential energy

• its potential energy is transformed into kinetic energy

• its potential energy increases

• its kinetic energy decreases

On which object was least amount of work done?

• W

• X

• Y

• Z

it takes 6.0 seconds for a pulley system to lift a crate weighing 300. N to a height of 5.0 meters. How much power is required to lift the crate ?

• 360 W

• 250 W

• 10 W

• 0.1 W

if the velocity of a sound remains constant and its frequency increases, which characteristic of the wave will decrease?

• amplitude

• wavelength

• energy

• speed