How can you explain why greasy substances are difficult to wash off?

Why is weather forecast so important for hang gliders need by 2:50 today

State the trend in electronegativity for the halogens as these elements are considered in order of increasing atomic number

Is the following equation balanced? 2Al + 3NiBr2 AlBr3 + 3Ni

Assuming the input of energy continues for another 5.0 seconds, where will the particle be? Displacement vs Time Displacement (cm) -15 -202 2008 Casewwe. In O equilibrium positive maximum negative maximum cannot be determined

Two glass jars A ana B are filled with carbondioxide and oxygen respectively. In each jar a lightened candle is placed simultaneously. In which jar the candle remain lightened?

What can a drop of liquid mercury be described as? A) a pure substance and a compound B) an impure substance that is reactive C) an impure substance that is unreactive D) a pure substance and an element

Which of the following likely formed Mars' moons?

Which process involves mass movement within a substance? a. conduction b. convection c. radiation d. reflection

A scientist observes that the electrical resistance of a superconducting material drops to zero when the material is cooled to very low temperatures. Which of the following statements best describes what the scientist is observing?

Which describes an object's speed in free fall? a. The object accelerates until it reaches its terminal velocity. b. The object falls at a constant speed because only one force acts on it. c.