What did the experiments with a rotating paddle wheel inside the cathode ray tube prove?
a Cathode rays are made of particles that have mass.
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b Cathode rays are negatively charged.
c Cathode rays have no electrical charge.
d Cathode rays are made of massless particles.

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

Base your answer on the information below and on your knowledge of chemistry. nitrogen dioxide, no2, is a dark brown gas that is used to make nitric acid and to bleach flour. nitrogen dioxide has a boiling point of 294 k at 101.3 kpa. in a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, n2o4. this equilibrium is represented by the equation below. 2no2(g) n2o4(g) + 58kj at standard pressure, compare the strength of intermolecular forces in no2(g) to the strength of intermolecular forces in n2(g).

What is a metal replacement reaction