Choose "extinct" if the species is extinct and "endangered" if the species is endangered. Two hundred years ago, billions of passenger pigeons lived in North America. The last known passenger pigeon died in the Cincinnati Zoo in 1914.

A chemical reaction produced 177.3 grams of chlorine has (Cl²). What was the volume of the gas?

Which of the following is smaller than the atomic radius of beryllium? a. the ionic radius of beryllium b. the atomic radius of lithium c. the ionic radius of carbon d. the atomic radius of magnesium

You have 2.00 l of dry h2 at stp. how many moles is this

When doing a recrystallization what observations would prompt you to perform a hot filtration?

According to the collision theory which of the following changes would increase the rate of a reaction between vinegar and sodium hydroxide

1 75 ml of lemon juice are added to 50 ml of water. What is the percent by vo of the solute?

How many moles of tungsten atoms are in 4.8 x 1025 atoms of tungsten?

At what speeds do you criuse down the track of a roller coaster

A sample of hydrogen gas is mixed with water vapor. The mixture has a total pressure of 755 torr and the water vapor has a partial pressure of 24 torr. What amount (in moles) of hydrogen gas is contained in 1.55 L of this mixture at 298 K?

Both equation I and II are balanced, but equation II is the correct way to write the balanced equation. Why do you think this is? (Hint: Think fractions.) I) 2 SnO2 + 4 H2 → 2 Sn + 4 H2O II) SnO2 + 2 H2 → Sn + 2 H2O