7. Lawrencium has a half-life of 3.00 minutes. I started with a 100.0 g sample. After 45.0 minutes how

much of my sample remains Lawrencium?

What was helium used for in the past?

In an unconformity between two layers of rock how is the upper layer usually described

How many moles of methane molecules, CH4, are in 80 grams of methane

What is the correct label for a solution? A. a homogeneous mixture B. a graduated substance C. a heterogeneous mixture D. a primary mixture of elements

Determine the number of molecules contained in 1 mole of sodium sulfate

What is the oxidation number of oxygen in HSO4-?

Which statement about Clinton s impeachment is true? A. Clinton s impeachment was supported by the majority of Americans. B. The impeachment charges were based on fraud found during the Whitewater investigation. C.

The value of partition function at 0 k should be a. zero b. infinity c. 1 d. 10^25

Is change in atmospheric co2 levels likely to impact marine life

Which of the following is true concerning atoms? A. Atoms are made of even smaller substances called subatomic particles B. The properties of atoms cannot be measured or observed