Which of these describes chemical reaction

The color of he substance

What are the correct coefficients when this equation is balanced? K + Br2 KBr

B6. How old is an object with a molar ratio of 15% bismuth-210 to 85% Thallium-206? A. 5 days B. 10 days C. 15 days D. 20 days

Why do scientists study seismographs?

Which of the following statements is true about the nucleus? A) Only neutrons hold the nucleus together B) Only the strong nuclear force holds the nucleus together C) The Presence of neutrons, the strong nuclear force, and the residual strong force

What is half-life of strontium-90?

What determines chemical properties and reactions? A. color of a substance B. size of the molecules C. atomic structure and bonds D. physical properties

5 jobs of your bones

So I found out that the Apollo 11's guidance computer had 2k memory but like of what? 2,000 Terabytes? Basically I would like to know the units

Given an activity series in which the most active metals are at the top of the list and the least active metals are at the bottom of the list, would copper be listed above silver or would silver be listed above copper?

The number of Joules needed to raise the temperature of 10 grams of water from 20°C to 30°C is