Which form of energy is converted to thermal energy when propane burns in air?

(1) electromagnetic (3) electrical

(2) nuclear (4) chemical

Which Statement is one of the the tree parts of cell theory? (A) All cells come from other cells. (B) Plant and animal cells are exactly alike. (C) Cells grow like crystals. (D) Cells assemble themselves from whatever is around.

A sample of fuel is found to contain 87.4% nitrogen and 12.6% hydrogen. if the molecular mass of the fuel is 32.05 grams/miles, what is the molecular formula of the fuel?

16.01 g of sulfur trioxide was decomposed into 6.41 g of sulfur and 9.60 g of oxygen. How many grams of sulfur trioxide would be needed to produce 28.80 g of oxygen?

Which of the following molecular geometries (shapes) are always Polar if 1 of the atoms around the central atom is Fluorine and the rest are Bromine? (example: CFBr3) Select all that apply. A. t-shapeB. square planarC. octahedralD. linearE.

Nitrogen and oxygen react to form nitrogen monoxide, like this: N2 (g) + O2 (g) →2NO (g) The reaction is endothermic. Suppose a mixture of N2, O2and NO has come to equilibrium in a closed reaction vessel.

Why is plastic not classified as a composite?

Consider HA2, the intermediate form of a diprotic acid. Ka for this species is 1024 and Kb is 1028. Nonetheless, the Ka and Kb reac - tions proceed to nearly the same extent when NaHA is dissolved in water. Explain.

Which of the following is true of group 6A? Includes Chlorine Includes Sulfur Gain 2 electrons Tend to form + 2 ions Have 5 valence electrons

What happens if you pour water in baking soda? Does it release energy? What kind?

Define chemistry in relation to biology and physics