True or False: It is OK to heat a sealed vessel. (In other words do you need to fit a release valve on your glassware in case pressures builds up)

60 is what part greater than 48

The balanced equation below shows the products that are formed when butane (C4H10) is combusted. 2C5H + 1302 - - - > 8CO2 + 10H2O What is the mole ratio of butane to carbon dioxide? 1:4 1:5 13:8 13:10

A cubic piece of metal measures 6.00 cm on each edge. If the metal is nickel, whose density is 8.90 g/cm3, what is the mass of the cube?

Diamonds are mostly composed of what element?

1. Which of the following statements is a consequence of the equation E=MC2 A. Energy is released when matter is destroyed. B. Mass and energy are equivalent. C.

How many electrons are contained in an Au3 + ion? (1) 76 (3) 82 (2) 79 (4) 197

Match the element with its number of valence electrons. Column A 1. Boron : Boron 2. Carbon : Carbon 3. Fluorine : Fluorine 4. Sodium : Sodium Column B a. 4 b. 1 c. 3 d. 7

The number of energy levels to which an electron can jump depends on the

The example of the ancient fish called a coelacanth was used to show us that science is constantly seeking new A) evidence B) ideas C) creatures D) Scientists

What factors allowed the koala population to grow beyond what their habitat could sustain?