Five examples for physical change

During the fission of uranium-235, neutrons are released and a small amount of mass is converted to energy. How many neutrons are in the nucleus of an atom of uranium-235? A. 92 B. 143 C. 235 D. 238

What is the formula for an ionic compound that contains the elements magnesium and chlorine?

In a cup of salt water, what is the solvent? what is the solute?

When you push downward on Earth to make a pole vault, does Earth exert an equal source on the pole?

Cancer is when what process is uncontrolled

Sunlight produces a spectrum of colors that includes what?

Which of the following is not a common use of gypsum? a. wallboard/drywall for homes b. a primary ingredient for toothpaste c. surgical splints and casts d. pH reducing agent for acidic soils

In which of the following are the symbol and name for the ion given correctly A. NH4+: ammonia; H+: hydride B. C2H3O2-: acetate; C2O4-: oxalite C. OH-: hydroxide; O2-: oxide D. PO3 3-: phosphate; PO4 3-: phosphite

If you add a large piece of zinc to a beaker of acid and, in a separate beaker, zinc shavings to a beaker of acid (of equal concentration/volume), the sample with the zinc shavings will react faster than the sample with the large piece.

How many atoms of oxygen are in 0.100 miles of silicon dioxide, SiO^2