A substance spontaneously explodes when exposed to other substances.

is this a chemical or physical reaction

How many moles of gold are in 3.60 grams of gold

Which method is appropriate for separating a mixture of iron and aluminum? A. using a magnet B. distillation C. evaporation D. observing different densities

Which of the following is an amorphous solid? O A. Diamond B. Graphite O C. Glass O D. Iron

Sodium reacts with chlorine gas according to the following reaction: 2Na (s) + Cl2 (g) →2NaCl (s) What volume of Cl2 gas, measured at 689 torr and 39 ∘C, is required to form 28 g of NaCl?

Which of the following concerning electrolytes and the solubility rules is/are true? 1. The solubility rules apply only to ionic substances. 2. All soluble ionic compounds are considered strong electrolytes. 3.

The graph below shows how solubility changes with temperature. What is the solubility of Na2HAsO4 at 60°C? 20 g/100 mL of water 46 g/100 mL of water 65 g/100 mL of water 70 g/100 mL of water

Which statement regarding water is true? Energy must be given off in order to break down the crystal lattice of ice to a liquid. Hydrogen bonds are stronger than covalent bonds. Liquid water is less dense than solid water.

Which of the following elements has the fewest valence electrons?. a. beryllium. b. boron. c. carbon. d. lithium

How many molecules are in 4.50 moles of H2O? A. 450 molecules B. 6.02 x 1023 molecules C. 2.71 x 1024 molecules D. 3.00 molecules

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 45.0 g of calcium fluoride