Which compound contains ionic bonds?

• C₂H₆

• PCl₅

• Ca₃N₂

• SF₂

Tags

NGSS.HS-PS1-3

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 (IIA) bonds with an element from group 17 (VIIA)?

• hydrogen bond

• covalent bond

• metallic bond

• ionic bond

Which information 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

On which object was the 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 wave remains constant and its frequency increases, which characteristic of the wave will decrease?

• amplitude

• wavelength

• energy

• speed

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

• 3 minutes

• 6 minutes

• 9 minutes

• 12 minutes