Which of the following will result in a chemical change?

A. Evaporating alcohol into vapor

B. Drying wood in a shed

C. Melting ice to obtain water

D. Burning coal in a furnace

An atom of Iron has at least three different isotopes. What is the difference between an isotope of 55Fe and an isotope of 58Fe?

Which compounds, in the list provided below, have double or triple bonds? LiBr : N2 : CCl4 : AlCl3 : CaCl2 : SiO2 :

In sucrose c12H22O11, how many atoms are there?

Which process would produce a similar pathway? condensation dehydration decomposition melting

What type of bond would you expect in a compound of oxygen & sodium?

Compare How does the current model of the atom differ from J. J. Thomson's model?

An environmental change is occurring due to continents shifting and moving to different parts of Earth's surface. What kind of change is this?

Which best describes the climate of Antarctica? A. Humid due to low elevation B. Slowly getting colder C. The coldest place on Earth D. Low temperatures due to high elevations

How many neutron and protons are in lithium-7?

Why do chemists use the mole?