Which of the following is an example of a chemical change?

Gasoline evaporating.

A ice cube melting.

Toasting a marshmallow.

Mixing sugar and water.

Inclined planes reduce the amount of effort needed to move an object, but increases

How does sea floor spreading work?

What is the standard cell potential of a cell made of theoretical metals ma/ma2 + and mb/mb2 + if the reduction potentials are - 0.19 v and - 0.85 v, respectively?

Pure, 24k gold is very malleable. by mixing gold with other metals it becomes less malleable. in what situations would you want to use gold that is not as malleable?

Hydrogen-filled balloon was ignited and 1.50 g of hydrogen reacted with 12.0 g of oxygen. how many grams of water vapor formed? (assume that water vapor is the only product.)

Which observation provided Albert Einstein the clue that he needed to explain the photoelectric effect

Which of the followings represents a negatively charged ion

Why do you think plant fossils are less common than body fossils?

Why are valence electrons important?

A woman carriers her 100-newton child for a distance of 50 meters to the child's bedroom. How much work does the woman do?