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

A chemist prepares a solution of calcium bromide CaBr2 by measuring out 4.81μmol of calcium bromide into a 50. mL volumetric flask and filling the flask to the mark with water.

What volume is occupied by 10.0 moles of ammonia, Nh3, at standard conditions?

What can be concluded if an ion of an element is smaller than an atom of the same element?

How many orbitals in 3rd shell is axial

What is the volume of 12.0 m hydrochloric acid that contains 3.646 g of hcl solute (36.46 g/mol) ?

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Jack wants to know if it takes longer for warm water to freeze into ice cubes than cold water, so he performed the following experiment. Jack placed 50 mL of water in the refrigerator and allowed it to cool to a temperature of 4°C.

How to calculate average concentration

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?