In order for a chemical reaction to occur there must always be

Which type of heat transfer causes a person sitting by the fire to feel warm

If two atoms are bonded with a bond energy of 87 kJ, what must be done to break the bond? A. 87 kJ of energy must be added B. The energy must be decreased by 87 kJ. C. The bond order has to be higher. D. No energy should come out or go in.

Which statement best describes the properties of sucrose? A. They are exactly like the properties of carbon (C). B. They are exactly like the properties of oxygen (O). C. They are exactly like the properties of hydrogen (H). D.

Place the following elements of the scale below from lowest energy ties energy Ca, K, Li, Sr, Cu, Na, Fe

If the wavelength of one wave is 0.25 or ¼ meters, how many waves will be formed in one meter?

For each solute, identify the better solvent: water or carbon tetrachloride

If an element has 43 electrons, 56 neutrons, and 43 protons, what is its approximate atomic mass?

What did the Cherokee do to assimilate? Check all that apply They invented a writing system. They resisted white settlement. They wrote a constitution. They planted cotton and farmed.

Which of the following correctly compares the radii of Cl and Cl-? Cl has a larger radius than Cl - because Cl has an additional energy shell. Cl has a smaller radius than Cl - because Cl has an expanded electron cloud.

When a stretched string is vibrated up and down with a particular frequency, it causes a standing wave to be produced.