1 Which scientist first said that "elements are made up of identical atoms

which cannot be created or destroyed"?

Bohr

Democritis

Thomson

O

Dalton

Other:

What does the δ - symbol mean on a water diagram? A. It indicates a partial negative charge on an atom in a covalent bond. B. It indicates a partial positive charge on an atom in a covalent bond. C. It indicates a partial loss of electron on an atom.

How many grams are in 1.50 moles of nacl

What is the name of Earth's closest star? Question 1 options: Sirrius Achemar Sun Canopus

Nicaragua experienced a drought in 1987 following warmer than average water temperatures in the eastern pacific. What likely caused the drought? A. The jet stream B. El Nino C. An occluded front D. La Nina

What partial pressure of He gas (in mm Hg) is required to maintain a solubility of 8.78*10-4 g/L in water at 25 °C? kH for He at 25 °C is 3.26*10-4 mol/L·atm.

What subatomic particle is specifically responsible for combining the atoms together to form a new substance?

A chemist reported that 100 gallons of a gas were available in a laboratory. Which property of the gas did the chemist report?

Is the water density higher than the aluminum density

How many moles of molecular oxygen (o2) are consumed in the complete combustion of one mole of pentane (c5h12) ?

A gas has a volume of 30 L at 105 kPa. What pressure is required to compress the gas to 21 L?