What is true about ionic and covalent compounds? A. Covalent compounds are good conductors of heat and electricity while ionic compounds are poor conductors.

B. Covalent compounds are very reactive with water while ionic compounds react very well with oxygen gas.

C. Covalent compounds are formed from nonmetals while ionic compounds are formed from nonmetals and metals.

D. Covalent compounds contain oppositely charged atoms while ionic compounds contain neutral atoms.

A48 g piece of ice at 0.0 ∘c is added to a sample of water at 7.4 ∘c. all of the ice melts and the temperature of the water decreases to 0.0 ∘c. how many grams of water were in the sample?

If a planet rotates 360 degrees during a 24 hour time period, what does that tell us about the planet? a. the middle of the planet is in darkness b. the seasons on the planet vary every day. c. the planet runs on a 12-hour time clock. d. the temperature on the planet varies daily.

Which statement describes the appearance of a temperature-vs.-time graph? a horizontal line shows that the temperature increases at a constant rate over time. a vertical line shows that the temperature decreases at a constant rate over time. horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases. horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.