Elements are classified by their?

Fe3O4 (s) + CO (g) →FeO (s) + CO2 (g) What coefficients will balance the equation? A) 3, 1, 1, 1 B) 1, 1, 3, 1 C) 3, 3, 1, 1 D) 2, 2, 6, 4

Using molecular orbitals, determine if the following cycloaddition of 1,3-butadiene and allyl anion is thermally allowed. heat?

The explosions that take place during a fireworks show are an example of which of the following? Chemical change Chemical property Physical change Physical property

What are two ways a machine converts energy?

Which type of rock forms as a result of cooling and crystallization? a. igneous b. classic c. metamorphic d. sedimentary

Which is a pure substance A) mixture B) solution C) element

Samuel adds a teaspoon of salt to a glass of water. He notices that the song disappears. Samuel takes a sip to discover that the water taste salty. What kind of change has occurred?

How are the physical and chemical properties of atoms represented on the periodic table of elements

how do we know isotopes exist?

Is albinism a dominant or recessive trait