What form is the underlined verb in the sentence?

Native American tribes in the eastern United States first * played * this fast-paced game hundreds of years ago.

a. past participle

b. past

c. present

d. present participle

How many atoms are found in 3.45 g of CO2?

Why is caffeine more soluble in dichloromethane compared to water?

A student performs an experiment similar to what you will be doing in lab, except using titanium metal instead of magnesium metal. The student weights out 0.108 g of titanium. How many moles of titanium is this?

Which physical properties can be used to Identity an unknown material?

What is one element in the same family as oxygen?

Why electrons are transferred during the course of the reaction between magnesium and oxygen?

Human muscle stores sugars in the form of

How much heat is needed to raise the temperature of 75 g of a substance by 15 C when the specific heat is 0.92 J/g-C?

A nitric acid solution flows at a constant rate of 5L/min into a large tank that initially held 200L of a 0.5% nitric acid solution. The solution inside the tank is kept well stirred and flows out of the tank at a rate of 10L/min.

How many molecules are in 237g (about a cup of water)