How do you know when a chemical reaction has taken place?

If a habitat becomes smaller how would it affect inhabitants

Explain how two two parents with brown skin could have a child with dark brown skin and anotherchild with light brown skin

If a barometer were built using ethanol () instead of mercury (), would the column of ethanol be higher than, lower than, or the same as the column of mercury at 1.00 atm?

The major ways people are exposed to toxins are by ingesting them, inhaling them, injecting them, or absorbing them through the skin.

Two metals with equal mass and different heat capacities are subject to the same amount of heat; which undergoes the smallest change? a) The metal with the higher heat capacity. b) The metal with the lower heat capacity.

What is the half-life of a radioisotope if a 40 g sample becomes 10 g after 20 minutes?

What fact shows that baking a chocolate chip cookie is a chemical reaction? The final product tastes and looks different from the original ingredients. All of the ingredients are mixed up in the cookie.

What specifically does STR measure? A) STR length B) the number of repeating units C) distance traveled on electrophoresis gel D) the difference between the number of repeating units between two STRs

The reaction A (g) ⇌ 2 B (g) A (g) ⇌ 2 B (g) has an equilibrium constant of K = 0.010 K = 0.010. What is the equilibrium constant for the reaction B (g) ⇌ 1 2 A (g) ?

A 0.239 gram sample of a gas in a 100-mL flask exerts a pressure of 603 mm Hg at 14 degrees Celsius. What is the gas?