What is the mass number of Ce

Which of the following would most likely increase if the amount of recycled materials decreased? A. the number of gas-powered cars B. the number of sugarcane plantations C. the number of trees D. the number of landfills

Which of the following solutions would not be expected to exist? Group of answer choices NaCl in CCl4 (carbon tetrachloride, a nonpolar solvent) Pentane, C5H12, in CCl4 Methyl alcohol, CH3OH, in water NaCl in water Vegetable oil in mineral oil

In which sample of water do the molecules have the highest average kinetic energy? (1) 20. mL at 100.°C (3) 60. mL at 60.°C (2) 40. mL at 80.°C (4) 80. mL at 40.°C

All living things are called a (n)

using what you know about electron configurations explain the notion that elements in the same column in the periodic table have similar chemical and physical properties

Ionic compounds are formed by the ... of electrons? by the what?

What is it called when energy is created without oxygen?

If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 Kelvin and 1.40 atmospheres? Show all of the work used to solve this problem. 2Li (s) + 2H2O (l) - > 2LiOH (aq) + H2 (g)

How did coroners handle their responsibilities in the early 1900s? Why was there a need for significant change in the job?

Which of the following is the best indication that a chemical change has taken place? a. The matter changes color. b. A mixture separates into layers. c. The change is reversible. d. The shape of the substance changes.