Calculate the lattice energy of calcium chloride given that the heat of sublimation of Ca is 121 kJ/mol and ¢H°f (CaCl2) 5 2795 kJ/mol.

Which statement is true about this reaction? 14N+H->150 A-It is a practical source of energy on Earth. B-It occurs only outside the solar system. C-Its product is heavier than each of its reactants. D-It shows the critical mass of an element

Explain the trend in atomic radius as you progress up column 17

In the late 1800s, the British scientist J. J. Thomson discovered that atoms were composed of positively-charged and negatively-charged particles. He proposed that these two types of particles were evenly mixed throughout the structure of the atom.

Which of the following statements about minerals is false? a. a mineral can break in only one way. b. the densities of many minerals are quite similar. c. the color of a mineral's powder doesn't change. d. minerals reflect light in different ways.

What is the molarity of 0.50g of Na dissolved in a 1.5 L solution?

What is Flocculation

What is the difference between a 1s orbital and a 2s orbital is that

Why should distilled water be used when conducting chemical tests? Select all that apply. O Distillation removes most chemicals present in tap water that could give us false results.

2. How can you use mass and volume to find density of a substance?

Grayson wants to build an inexpensive shelter at his bus stop that he can stand in when it rains. What material would be best for building a shelter that is both strong and waterproof