Which process represents a chemical change? (1) melting of ice (2) corrosion of copper (3) evaporation of water (4) crystallization of sugar

Write the electron configurations of cu2 + and ag+. is each electron configuration consistent with the color you observed for each cation? explain.

What did J. J. Thomson's cathode-ray tube experiment show? a. Atoms are small individual spheres. b. Electrons are in a cloud surrounding positively charged particles. c. Matter can be neither created nor destroyed. d.

When a covalent bond forms between atoms, electrons are a. lost. b. gained. c. shared. d. transferred.?

There are three isotopes of silicon. They have mass numbers of 28, 29 and 30. The average atomic mass of silicon is 28.086amu. What does this say about the relative abundances of the three isotopes?

Eric needs a metal that he can bend and shape easily but that will not conduct electricity well. He will need to melt the metal, but his melting equipment can only reach 750°C.

Calculate zeff for a valence electron in an oxygen atom.

Which of the following are physically properties of a penny

Complete the following statements about the functions of the digestive system. The starts an involuntary swallowing action when it senses food. The squeezes food down the digestive tract by an involuntary synchronized muscle movement called.

Explain how thermal energy is transferred through convection.

What are the coefficients that will balance this skeleton equation? a l c l 3 + naoh → al (oh) 3 + nacl?