Who has the more atomic size between atom:

Br & Si?

Which statement best describes a true solution? A true solution will settle out after a short period of time. A true solution coagulates when heated or boiled. A true solution will not separate in a centrifuge.

How many types of van der Waals forces exist? 1 2 3 4

The rate of a chemical reaction in a cell is the measure of how A) often the reaction occurs. B) quickly the substrates are converted to product. C) much energy must be added for the reaction to occur.

Finish this sentence: Lithium emits a red light when heated because ...

A car travels 30 km north in 25 min. and 40km east in 35 min. What is the total distance traveled?

Which terms identify types of chemical reactions? (1) decomposition and : sublimation (2) decomposition and synthesis (3) deposition and sublimation (4) deposition and synthesis

What element behaves MOST like magnesium (Mg) ? A) S B) Si C) Sn D) Sr

It was determined through analysis that a compound, sodium carbonate with a molar mass of 263 g/mol contained 68.4% water. determine the toilet number of water molecules in this hydrate

Which 1.0 M solution has the lowest pH?

If the heat of fusion of water is 3.4 * 102 j/g, the amount of heat energy required to change 15.0 grams of ice at 0°c to 15.0 grams of water at 0°c is