What are some indicators that a chemical reaction is occurring? Check all that apply.

Determine the total time required for an 80.0-gram sampleof I-131 to decay until only 1.25 grams of the sample remains unchanged.

When does water move between the surface of earth and the atmosphere

Metal atoms will most likely form ions by the 1 loss of protons. 2 loss of electrons. 3 gain of electrons. 4 gain of protons.

In their Lewis Dot Structures, the halogen atoms would all have the same number of dots surrounding their symbols. A. True B. False

Is sodium element a metal nonmetal or metalloid

Compare the practical uses and limitations of nuclear fission and fusion. Include in your answer a detailed description of the two processes, comparing and contrasting them in terms of the types of atoms involved, the conditions needed to get the

Why can two igneous rocks have the same minerals but different names?

Where do the heaviest elements in our solar system come from?

Four students presented different analogies to describe the formation of an ionic bond. Student A: A tug of war between seven middle school students and a high school student Student B: A small dog and a big dog tugging at a bone with equal strength

Chemical reactions occur when molecules or atoms collide so that the bonds between atoms break and new bonds form. breaking the bonds of the reactants requires energy; whereas, bond formation releases energy.