What is silica sand used for?

What is the formula of sulfurous acid? H2S HSO4 H2SO4 H2SO3

Dissolve substances in water is: A) physical process B) chemical process

What best explains the observed trend in atomic radii going down the periodic table

Explain why sharpening a pencil is a different type of physical change it freezing water to make ice cubes

An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn? The atom has 7 neutrons and 8 protons. The atom has 7 electrons and 8 protons.

Which probably best indicates that a compound contains an ionic bond

A gas in a balloon at constant pressure has a volume of 185 mL at - 125*C. What is it's volume at 31.0*C? Show all work including what equation or gas law you use.

Which of the following is a property of metals that is due to the delocalized electrons A. transparency B. dull Appearance C. brittle D. good conductor

Three identical beakers each hold 1000 g of water at 20 ∘C. 100 g of liquid water at 0∘C is added to the first beaker, 100 g of ice at 0 ∘C is added to the second beaker, and the third beaker gets 100 g of aluminum at 0∘C.

What would be an example of a chemical change that took a long time to occur?