Can atoms be created or destroyed during a chemical reaction?

Look at the chemical equation shown below. A, B, X, and Y represent different elements or polyatomic ions.

Mole ratios how can the coefficients in a chemical equation be interpreted. True or False

Element X has five valence electrons, element Y has one valence electron, and element Z has five valence electrons. Which two of these elements are most likely to have similar properties? Explain your answer

A solution is made by mixing 33.0 ml of ethanol, C2H6O and 67.0 ml of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 degree C? Ethanol =.789 g/ml 43.9 torr. water =.998 g/ml 17.5 torr

A box experiences a force of 2 N to the left and 3 N to the right. Which is true of the box's motion? A) The box will slow down. B) The box's velocity will be 1 m/s. C) The box's velocity will not change. D) The box will experience acceleration.

What is the chemical formula of a compound that is composed of the ions Ca2 + and br-

What element is likely to form an ionic compound with chlorine?

Will a parachute slow a skydiver more at a very high altitude or a lower altitude?

Carbon monoxide is: Only found in large cities An odorless, colorless, toxic gas Healthy to breath in A danger when driving on the open highway

What is a potential benefit of fuel cell cars? increased efficiency converting gasoline to energy no recharging necessary decreased automobile cost larger engines