Which identifies that a chemical reaction has occurred?
a. new substances are produced.
b. the color has changed.
c. bubbles have formed.
d. temperature has changed.

Select the correct answer. which statement is true about a polarized object? o a. it gains electrons and becomes negatively charged. ob. it gains protons and becomes positively charged. oc. the number of positive and negative charges can be the same. od. it has to be a metal. o e. there is no change in the distribution of the charge in the object. reset next what

What is the atomic number of an atom that has 6 protons

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver