What is the main organ of the circulatory system?

arteries

veins

heart

capillaries

How many Calories are in 6.2 * 10^4 calories? Show your work and watch the sig figs

Which expression represents the ΔH for a chemical reaction in terms of the potential energy, PE, of its products and reactants?

Explain what an ecosystem would look like without scavengers and decomposers.

Which is a characteristic of a solution?

How many moles of N2 is 224 L of N2?

Which state of the West produces the widest varieties of fruits, vegetables, and nuts? A) California B) Colorado C) Wyoming D) Alaska

A chemical engineer for a fertilizer company is determining the most efficient way to produce ammonia. the engineer carries out the haber reaction under four different conditions.

What type of Bond exist in a molecule of hydrogen Iodide

Which common material is an example of a polyamide?

A particular brand of gasoline has a density of 0.737 g/mL at 25 ∘ C. How many grams of this gasoline would fill a 12.8 gal tank (1US gal=3.78L) ?