true or false? A canopy of water once shielded man from the sun's radiation.

An exothermic reaction has A) a negative ΔH, absorbs heat from the surroundings, and feels cold to the touch. B) a positive ΔH, gives off heat to the surroundings, and feels warm to the touch.

Select all that apply. when the products of a reaction have more energy than the reactants: the reaction is exothermic. the reaction is endothermic. the reactants gave up energy. the δh is positive.

A sample of an unknown metal (density = 4.920 g/mL) weighs 550.0 g. What is the volume of this piece of metal? a. 111.8 mL b. none of these c. 2.706 * 10^3 mL d. 1.118 * 10^5 mL e. 8.945 * 10^-3 mL

Is metallic bonds a compounds that are ductile and excellent conductors of electricity?

The label on an ocean spray cran-rasberry drink lists 30 g of sugar in 240 ml of drink. I weighed 240 ml of drink and found its mass to be 251 g. What is the percent composition of sugar in the drink?

Why arent the jaguars and sloths growing and thriving?

If a spoon is hot after leaving it on the pot that was on the stove. What heat transfer is that.

If a small amount of ferrous ammonium sulfate is spilled when transferring

List one reason as to why historical growth has slowed in recent years.

Name some specific liquids that you think might contain less than 80 percent water.