Rob is studying for an exam. He listed some properties of magnets in a Maglev train.

Which best explains Rob's error?

Which molecule is amphoteric

A considerable amount of heat is required for the decomposition of aluminum oxide. 2 al2o3 (s) â 4 al (s) + 3 o2 (g) Î'h = 3352 kj (a) what is the heat change for the formation of 1 mol of aluminum oxide from its elements?

Which structural formula represents 1,1 dibromopropane

If a substance changes from one phase to another, is it still same substance? why

When comparing anions from the same period, higher electronegativity of A in the H-A bond increases / decreases (circle the correct answer) acid strength.

How many atoms are in phosphorus

What is the empirical formula of something that is 40% sodium and 60% chlorine

Mendel discovered that: Herbicides can be used to kill weeds. Photosynthesis cannot occur without chlorophyll. Plant traits are inherited. Fertilizers can improve crop quality.

Nitrifiers are bacteria a. capable of living in symbiosis in the roots of some plants. b. capable of oxidizing NH3 using NO. c. that convert N2 to NH3. d. that generate nitrites or nitrates. e. capable of using NH3 as an electron donor.

0710 A missile is flying at a speed of 125 m/s. If the missile has a mass of 125 kg, what's its kinetic energy? Keep 4 significant figures.