The number of protons in a neutral atom is
A) called the mass number.
B) zero.
C) the same for all elements.
D) equal to the number of electrons.
E) equal to the number of neutrons.
D
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Answer the following statement(s) true (T) or false (F)
1. A person who exerts a 100-N force horizontally in the +x direction on a wall for 10 minutes does positive work on the wall. 2. When an object slides down a frictionless incline, the contact interaction between the object and incline does no work on the object. 3. The interaction does not change the object’s kinetic energy. 4. The interaction does not change the object’s momentum. 5. A heavy ball swings at the end of a chain connected to a hook in the ceiling. Suppose I pull the ball away from its equilibrium position, hold it against my nose (with the chain taut), and then release the ball from rest. The ball swings away and then back toward my face. As long as I don’t move, and the ball is left alone, I can be confident that the ball will not smash my nose.
The battery powering a light bulb is disconnected. As the light bulb's heat dissipates, how will the resistance and current change?
1.The resistance will decrease and the current will increase. 2.The resistance will increase and the current will be zero. 3.The resistance will increase and the current will decrease. 4.The resistance will decrease and the current will be zero.
What element is oxidized in the following equation and what element is reduced?
SN2 + 2 Ag ? Sn + 2 Ag? A) The tin ion, SN2 , is oxidized, while the silver, Ag, is reduced. B) The tin ion, SN2 , is reduced, while the silver, Ag, is oxidized. C) Both the tin ion, SN2 , and the silver, Ag, are reduced. D) Both the tin ion, SN2 , and the silver, Ag, are oxidized.
The precipitation of and crystallization of evaporite minerals is very similar to the crystallization of minerals from a magma. The first evaporite minerals to precipitate (crystallize) are those with the
A) lowest solubility. B) highest melting point. C) lowest silica content. D) highest solubility.