Evaporating water is an example of a physical change because

The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole. How many carbon atoms are in 1.50 g of butane?

What type of rock would you expect to form as the result of an explosive eruption?

At its highest salinity, the water in Utah's Great Salt Lake contains about 14.5g of salt in 50g of lake after. What was the salinity of the lake?

Which emission line in the hydrogen spectrum occurs at the highest frequency?

In a classroom which comparison would a teacher most likely use for describing a mole

What would you measure a cooking pot by

Is pancakes cooking on a griddle a physical or chemical change?

To determine whether a shiny gold-colored rock is actually gold, a chemistry student decides to measure its heat capacity. She first weighs the rock and finds that it has a mass of 4.7 g. She then finds that, upon absorption of 52.

In most Acid-base reactions, what type of bond (ionic or covalent) is formed between the ions of the "salt"? What happens to the electrons in this sort of bond? Are they transferred, or shared?

Many trials are not needed before a hypothesis can be accepted