Which of the following is true about light waves? (Select all that apply.) Light waves need a medium to travel through.

Light waves do not need a medium to travel through.

Light waves are transverse.

Light waves are longitudinal.

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

For each of the following compounds, write the formula then predict whether it would be a strong, weak, or non-electrolyte when placed in di water. for the ionic compounds only, put (s) or (aq) after the forrmula formula strong, weak or non electrolyte? a calcium hydroxide b. silver carbonate c. lead(ii) sulfate d. phosphorus trifluoride e. sodium phosphide f barium sulfate g. strontium acetate h. zinc nitrate