Which is not one of the eight most common elements in Earth's continental crust?

oxygen

aluminum

silicon

carbon

Two of the disadvantages of using chemical agents for terrorist activity are that production and deployment are hazardous to terrorists and: select one: require large quantities require military training need a specific date require a lethal dose

Which organism has a central brain? A fish B flatworm C sponge D hydra

What are the exceptions to the periodic trends in ionization energy?

Write the equilibrium-constant expression for the reaction if the equilibrium constant is 78

What has the greatest mass? a. a speck of dust b. a boulder c. a mountain d. a pebble

If measurements of a gas are 75l and 300 kilopascals and then the gas is measured a second Time and found to be 50L describe what had to happen to the pressure

The neritic zone is also called the: a. Intertidal zone c. Eutrophic zone b. Bathyal zone d. Subtidal zone

How many moles of liquid water must freeze to remove 100 kJ of heat? (ΔHf = - 334 J/ g.

What is the power of a kitchen blender if it can perform 3750 joules of work in 15 seconds?

A 75.00 g a sample of a substance is analyzed and found to consist of 32.73 g phosphorus and 42.7 g oxygen. calculate the percent composition of this substance.