When you rub a match against a rough surface, fire results, giving off light and heat. The law of conservation of energy says that energy cannot be created. How can you explain the fire seeming to come from nowhere?

Which particle of the atom has no charge? A. nucleus B. electron C. neutron D. proton

How many fluorine atoms are present in 5.85 g of c2f4?

A decrease in height of a column in a mercury barometer means that

33. According to the law of conservation of mass, when is mass conserved?

A sample of metal has a mass of 18.20g, and a volume of 7.38mL. What is the density in g/cm^3?

Heat is most closely related to ___ energy. A. Nuclear B. Electrical C. Thermal

How many moles are in 26.4 grams of lithium

What is the independent, dependent, control group and constant: A student wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight.

Where are two places that scientists obtain scientific knowledge

Which of the following best describes what happens when an ionic bond forms? A) two atoms come together and share electrons in order to fill their octets. B) two atoms give up their electrons in order to form a bond.