Classify which of the following is a substance: tablero salt, seawater or sand? Explain how you know.

Why does the same note played on different instruments not sound the same?

Which of the following energy resources produces greenhouse gases? A. Coal B. Wind C. Geothermal D. Solar

What is a physical quantity?

Resistance of rod is 1 ohm. It is bent in the form of square. The resistance across adjoint corners is.

A net force of magnitude 36N gives an object of mass m1 an acceleration of 6.0m/s2. The same net force gives m1 and another object of mass m2 fastened together an acceleration of 2.0 m/s2.

Which would react chemically by forming an ionic bond? A. 2 chlorine atoms with 7 valence electrons each B. 1 neon atom with 8 valence electrons and 1 lithium atom with 1 valence electron C.

Which of these are considered an oxidizing mutagenic agent? x-rays benzopyrene gamma rays

5. A B note has a frequency of 493.88 Hz. Calculate its wavelength in meters.

When one of the electrons of a particular atom undergoes a transition to a quantum state of lower energy, it a) collides with another of its electrons b) exchanges quantum states with another of its electrons c) undergoes a transition to a quantum

What's the symbol for an ionized bromine atom?