The symbol Ca-40 denotes that

A. a calcium atom contains 40 protons

B. a calcium atom contains 40 electrons

C. a calcium atom contains 40 neutrons

D. a calcium atom has a mass number of 40

Which change takes place in a nuclear fusion reaction? (1) Matter is converted to energy. (2) Energy is converted to matter. (3) Ionic bonds are converted to covalent bonds. (4) Covalent bonds are converted to ionic bonds.

What are the three fundamentals particles of an atom

A molecule of nitrogen gas consists of two nitrogen atoms joined together. Write the formula of nitrogen gas.

Why do atoms form ions?

Which of the following is the same as a beta particle? a. photon b. electron c. helium nucleus

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

Water is a great solvent. For example, it causes ionic compounds like sodium chloride (table salt) to dissociate. One of these reasons that water does is because it is polar molecule.

For most compounds with a single keto group in the molecule, equilibrium favors the keto form over the enol form of the compound. this is due largely to what?