Which substance in cigarettes numbs the throat to allow for deeper inhalation?

a. tar

b. menthol

c. carbon monoxide

d. nicotine

Why is it important to inhale through your nose? a) Your mouth cannot take in oxygen. b) Your nose cleans the air you breathe. c) Your nose breaks down oxygen.

How many liters of chlorine gas can be produced when 0.98 l of hcl react with excess o2 at stp? 4hcl (g) + o2 (g) - > 2cl2 (g) + 2h2o (g) ?

The molecular clock theory uses genetic traits to estimate how long ago various groups of organisms diverged evolutionarily from one another. Which of the following statements explains why this is considered to be a theory?

Hanna hypothesizes that granite is denser than sandstone. How can Hanna test her hypothesis?

Which chemical agent is thought to be associated with "runner's high"?

What happens to the equilibrium if the pressure is increased?

Which of the following colors of visible light has the lowest energy? A) blue B) green C) red D) yellow

All are true about how does gravity aid erosion except? Gravity causes rocks to fall and break apart. Gravity causes rocks to get larger then breaks it apart. Gravity pulls rainwater down eroding rocks.

Determine the empirical formula of the following compound: A 0.4987-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.9267 g of carbon dioxide and 0.1897 g of water.

How many moles of NH3 from when 32.4 L of H2 gas completely reacts at STP according to the following reaction? Remember 1 mol of an ideal gas has a volume of 22.4 L at STP N₂ (g) + 3H₂ (g) →2NH₃ (g) ps: We have to not only give the answer which is 1.