How many grams of Hydrogen (H) would need to react with 190 grams of Fluorine (F) to make 200 grams of HF (Hydrofluoric Acid) ?

A passenger in a car is holding an open water bottle when the car stops suddenly. Why does the water in the bottle splash out when the car stops? It is in static equilibrium. It has less friction. It has inertia. It loses gravity when in motion.

A perpetual motion machine can never be built because it is not possible to eliminate A) Momentum B) Inertia C) Elasticity D) Friction

Which statement describes refrigeration systems? Refrigeration systems add cold air to the inside of a building. Refrigeration systems remove all thermal energy from inside the building.

Which of the following does culture contribute to the preferences and behaviors of consumers?

Town meetings are typically associated with what level of government? A) global B) local C) national D) state

I don't have it anymore since no one cared to answer

When a substance changes from one phase to another, which of the following events occurs?

Which of the following contains both protons and neutrons? a. outer shell b. nucleus c. covalent bond d. ionic bond

Density is a property of matter that relates

A main sequence star cools and expands. It must be entering which stage? A. white dwarf B. black dwarf C. red giant D. neutron star ... ?