Classify blood as a mixture or a pure substance. if blood is a mixture, classify it as either heterogeneous or homogeneous. if blood is a pure substance, identify it as either an element or a compound.

Is 2AI + 3O2 = 2AI2O3 balanced or unbalanced?

Which of the following is NOT shown by a Lewis dot structure? the three-dimensional geometry of the bonded atoms the number and symbols of atoms present the way atoms connect to each other within the molecule the total number of valence electrons

An exothermic reaction has a positive enthalpy (heat) of reaction. (T/F)

Does ice melt faster when it is covered or when it is uncovered? list the materials you might need to do this experiment

Which of the following examples does NOT describe nuclear fission? Bombarding uranium nuclei with beta particles to produce two lighter atomic nuclei. Colliding hydrogen atoms to produce heavier helium atoms.

An aqueous solution is made from a molecular compound rather than from an ionic compound. If some ions are present in solution, which best describes the solute? A. a weak electrolyte B. a nonelectrolyte C. a strong electrolyte D.

Which of the following measures the radiation given off by atoms per second?

What is the name of the outermost layer that forms a boundary around the outside of each cell

What does an ionic compound form?

How many electrons in an atom could have these sets of quantum numbers n=7 l=3 ml=-1?