Where does radioactivity come from?

A. The nuclei of unstable isotopes

B. Physical changes in atoms

C. Chemical reactions

D. The breaking of chemical bonds

Identify the reaction type shown and describe the clues that were used to identify it. Fe2O3 + 2SiO2 → Fe2Si2O7

Which of the following is not a common property or characteristic of an acid? A. Reacts with active metals to produce hydrogen gas B. Slippery feel C. Sour taste D. Reacts with a base to produce a salt

What are the correct coefficients for the reaction below: AlCl3 + NaOH - -> Al (OH) 3 + NaCl a) 3, 1, 1, 1 b) 3, 1, 3, 1 c) 1, 3, 1, 3 d) 1, 1, 1, 3 e) 1, 3, 3, 1

Which electromagnetic waves have the hugest energy? A: Gamma rays B: light waves C: radio waves D: X-Rays

Scientists estimate Earth's age to be 4.6 billion years. Samarium has a half-life of approximately 106 billion years.

What is a scientific explanation for a range of hypotheses and observations supported by testing

A chemical reaction involves the rearrangement of atoms to form new molecules. During a chemical reaction, however, atoms are neither created nor destroyed. Which of the following is true about the atoms involved in a chemical reaction? A.

What is the new concentration, after diluting 300 mL of a 1.5 M LiCl solution to 1L

The answer that he gave was wrong

In which orbital does an electron in a bromine atom experience the smallest?