Which of the following is not one of the postulates
proposed by Dalton in his atomic theory?
a) No atoms are gained, lost, or changed in identity
during a chemical reaction.
b) All elements can be placed in a periodic table
showing their reaction capabilities.
c) Each element is composed of small, indivisible
particles called atoms.
d) Chemical combination is the bonding of a definite
number of atoms into a molecule.
b
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Conductors: A conductor is placed in a steady external electric field. Which of the following statements are correct for this situation? (There could be more than one correct choice.)
A. The electric field is zero inside the conductor. B. All the free electrons go to the surface of the conductor. C. The surface of the conductor is neutral. D. The electric field just outside the surface of the conductor is perpendicular to the surface. E. None of these statements are correct.
Find the sum of the following two vectors: (i) 50 units due east and (ii) 100 units 30° south of west
a. 100 units 30° south of west b. 62 units 54° south of west c. 87 units 60° south of west d. 62 units 15° south of west
A given net force propels an object along a straight-line path. If the mass were doubled, its acceleration would
A) quadruple. B) double. C) stay the same. D) be half. E) none of the above
Presently, what is happening to the helium in the Sun's core?
What will be an ideal response?