Which of these is an example of a physical change

baking a cake

toasting bread

grinding pepper

lighting up a grill

When a 1.00 L sample of water from the surface of the Dead Sea (which is more than 400 meters below sea level and much saltier than ordinary seawater) is evaporated, 196 grams of MgCl2 are recovered.

For which of the following processes would you expect there to be an increase in entropy? Ag + (aq) + Cl - (aq) AgCl (s) H2O (g) H2O (l) CaBr2 (s) Ca+2 (aq) + 2Br - (aq) CO2 (g) CO2 (s) N2 (g) + 3F2 (g) 2NF3 (g)

Which of the following has the largest number of molecules? a 1 g of benzene, C6H6 b 1 g of formaldehyde, CH2O c 1 g of TNT, C7H5N3O6 d 1 g of naphthalene, C10H8 e 1 g of glucose, C6H12O6

Which of the following is the primary force that shapes the earths landscape

What does the statement "Mass is conserved during a chemical reaction" mean?

A gas has a volume of 30 L at 105 kPa. What pressure is required to compress the gas to 21 L?

Using special equipment which layer of the sun atmosphere is visible during a total solar eclipse

The characteristic flame test colors of metal ions are due to atomic emission spectra. Duscuss the relationship between the absoption and emission of light and the factors responsible for flame test colors.

Should a bartender use ice and scoop directly from ice machine or use an ice holding device and scoop to make drinks and refill drinks from

What classification should this reaction have? 4Al + 3O2 → 2Al2O3