Changes that alter the chemical composition of a substance are known as ______________ changes
Fill in the blank(s) with correct word
chemical
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Spherical Mirrors: An upright object is 50 cm from a concave mirror of radius 60 cm. The character of the image is
A. real and upright. B. real and inverted. C. virtual and upright. D. virtual and inverted.
The observations of sunspots on the Sun and craters on the Moon by Galileo contradicted the commonly held belief that the universe was
A) spherical B) unchanging C) infinite D) perfect
Concerning the force holding an atom together [that is, holding the electrons into the nucleus] and the force holding the solar system together: Are these basically the same type of force?
A) Yes, both are electromagnetic forces. B) Yes, both are gravitational forces. C) No, nuclear forces hold an atom together while electromagnetic forces hold the solar system together. D) No, electromagnetic forces hold atoms together while gravitational forces hold the solar system together. E) No, nuclear forces hold an atom together while gravitational forces hold the solar system together.
The speed of sound varies with
A) loudness. B) frequency. C) wavelength. D) all of the above E) none of the above