What must occur for a change to be a chemical reaction

What are some examples of things you expect to see when observing a chemical reaction?

True of False: Only conclusions that support the hypothesis should be reported in scientific research.

If an electrostatically charged object is placed near other objects, which of the following will occur? Select all that apply. It will be attracted to objects with the same charge. It will be attracted to object of the opposite charge.

A chemistry student needs 55.0g of carbon tetrachloride for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of carbon tetrachloride is 1.59·gcm-3.

If the pH of a solution is 10.3, what is the [H+] concentration

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?